IDEAL EXALT Combi 155 User manual

1
See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
EXALT COMBI AND SOLO

2See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
Features & specification
INDUSTRY LEADING
WARRANTY PROGRAM
- Standard – 2-year parts and 10-year
primary heat exchanger warranty
- Plus – 5-year parts, 2-year labor
allowance, and 10-year primary
heat exchanger warranty with
registration
- Elite – 6-year parts, 3-years labor
and 12-year heat exchanger
warranty oered with registration,
combustion analysis and hydronic
system treatment. See warranty
for details.
STAINLESS STEEL FIRE TUBE
HEAT EXCHANGER
-ASME Certified
- 50 PSI Maximum working pressure
VENTING
- 2” Vent Exalt 110 & 155 up to 28’
- 3” Vent all models up to 100’
- 3 in 1 Universal vent adapter directly
accepts PVC, Polypropylene and
Stainless Steel
COMBI FEATURES
- Endless hot water
- Large brazed plate heat exchanger
to maximize eciency
- Condensing in DHW Mode
CTRLMAX CONTROL SYSTEM
- EZ Setup allows for quick
60 second setup
- Easy
troubleshooting in plain text,no
codes
-Operate up to 3 circulators
-Outdoor reset to optimize efficiency
- Domestic hot water priority to
maximize hot water production
- Accepts 0-10 VDC signal
- ModBus ready
-Multiple heating curves
INTEGRATED CASCADE
- Integrated cascade function
for up to 6 Exalt Solo boilers
Technical Specification
EXALT MODEL Solo 110 Solo 155 Solo 199 Combi 155 Combi 199
Min Input (BTU) 13,75019,37524,875 19,375 24,875
Max Input (BTU) 110,000 155,000 199,000 155,000 199,000
Turndown Ratio 8:1 8:1 8:1 8:1 8:1
AFUE 95%95% 95%95% 95%
DOE Heating Capacity (MBH) 102 142 184 142 184
AHRI Net Rating (MBH) 89 123 159 123 159
Fuel NG & LP NG & LP NG & LP NG & LP NG & LP
Gas Connection 3/4" 3/4" 3/4" 3/4" 3/4"
Supply / Return Connections 1” 1” 1” 1” 1”
Domestic Inlet/Outlet Connections ---3/4" 3/4"
Vent/Air Connections* 3” 3” 3” 3” 3”
2” Maximum Vent Length 28’ 28’-28’ -
3” Maximum Vent Length 100’ 100’ 100’ 100’ 100’
Water Volume (Gallons)23434
DHW Output GPM (70°F Rise) ---4.0 5.3
DHW Output GPM (75°F Rise) ---3.7 4.9
DHW Output GPM (80°F Rise) ---3.5 4.6
DHW Minimum Flow Rate (GPM) ---0.50.5
DHW Maximum Operating Pressure (PSI) ---150 150
CH Maximum Temperature (°F[°C]) 185 (85) 185 (85) 185 (85) 185 (85) 185 (85)
DHW Maximum Temperature (°F[°C]) ---150 (65) 150 (65)
Cabinet Height 26” 26” 26” 33” 33”
Cabinet Width 21 3/4" 21 3/4" 21 3/4" 21 3/4" 21 3/4"
Cabinet Depth 16 1/2" 16 1/2" 16 1/2" 16 1/2" 16 1/2"
Weight (Lbs)8899 119 110 128
FEATURES & SPECIFICATIONS
Ideal USA reserves the right to change the technical characteristics, components and features of its products without prior notice.
Check for an updated version of this quick reference guide at www.idealusa.com.
This quick reference guide is not a substitute for the installation manuals included with the boiler.
Boiler installation must be in accordance with the boiler manuals and the local authority having jurisdiction.

3See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
COMBI USING A LOW LOSS HEADER
COMBI USING CLOSELY SPACED TEES
COMBI BOILERS
COMBI BOILERS

4See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
CH2
6 5
System
Sensor
4 3
Modulation
Signal
-+
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
6 5
System
Sensor
4 3
Modulation
Signal
-+
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
Ther mostat
N G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
L
WATE R
SUPP LY
O S
COMBI BOILER
SINGLE ZONE WITH CLOSELY SPACE TEES
Power
120VAC
* No Pump Setting Changes Needed With This Configuration
CH2
6 5
System
Sensor
4 3
Modulation
Signal
-+
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
6 5
System
Sensor
4 3
Modulation
Signal
-+
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
Ther mostat
N G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
L
WATE R
SUPP LY
O S
COMBI BOILER
SINGLE ZONE WITH CLOSELY SPACE TEES
Power
120VAC
* No Pump Setting Changes Needed With This Configuration
CH2
6 5
System
Sensor
4 3
Modulation
Signal
-+
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
6 5
System
Sensor
4 3
Modulation
Signal
-+
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
Ther mostat
N G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
L
WATE R
SUPP LY
O S
COMBI BOILER
SINGLE ZONE WITH CLOSELY SPACE TEES
Power
120VAC
* No Pump Setting Changes Needed With This Configuration

5See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
CH2
6 5
System
Sensor
4 3
Modulation
Signal
-+
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
6 5
System
Sensor
4 3
Modulation
Signal
-+
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
Ther mostat
N G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
L
WATE R
SUPP LY
COMBI BOILER
SINGLE ZONE WITH LOW LOSS HEADER
O S
Power
120VAC
* No Pump Setting Changes Needed With This Configuration
CH2
6 5
System
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
6 5
System
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
Ther mostat
N G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
L
WATE R
SUPP LY
COMBI BOILER
SINGLE ZONE WITH LOW LOSS HEADER
O S
Power
120VAC
* No Pump Setting Changes Needed With This Configuration
CH2
6 5
System
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
6 5
System
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
Ther mostat
N G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
L
WATE R
SUPP LY
COMBI BOILER
SINGLE ZONE WITH LOW LOSS HEADER
O S
Power
120VAC
* No Pump Setting Changes Needed With This Configuration

6See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
6See appendix for listing of additional components.
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
FLAM ESU PPLY CH PUMP DHW PUMP
LN G L N G L N G L N G
FLAM ESU PPLY CH PUMP DHW PUMP
L
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
24 VA C
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OF F
ON
OF F
ON
ZONE 4
PRIORITY
OF F
ON
WWRR
ZONE 1ZONE 1
WR
ZONE 1
WWRR
ZONE 2ZONE 2
WR
ZONE 2
WWRR
ZONE 3ZONE 3
WR
ZONE 3
WWRR
ZONE 4ZONE 4
WR
ZONE 4
PRIORI TYPRIORI TYTHERMOSTATS (24 VAC)THERMOSTATS (24 VAC)
XXXX
ISOLATED
EN D
SW IT CH
ISOLATED
EN D
SW IT CH
XX
ISOLATED
EN D
SW IT CH
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORS12 0 VAC CIRCULATORSINPUT
12 0 VAC
INPUT
12 0 VAC
INPUT
12 0 VAC
HHNN
INPUT
12 0 VAC
HNHHNN
ZONE 4ZONE 4
PRIORI TYPRIORI TY
HN
ZONE 4
PRIORI TY
HHNN
ZONE 3ZONE 3
HN
ZONE 3ZONE 2ZONE 2
HHNN
ZONE 2
HN
ZONE 1ZONE 1
HHNN
ZONE 1
HN
12 0 VAC12 0 VAC
ZCZC ZRZR
HH HH
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORSINPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORSINPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORSINPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORSINPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
WATE R
SUPP LY
O S
COMBI BOILER
WITH MULTIPLE PUMPS
* No Pump Setting Changes Needed With This Configuration
Power
120VAC
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
FLAM ESU PPLY CH PUMP DHW PUMP
LN G L N G L N G L N G
FLAM ESU PPLY CH PUMP DHW PUMP
L
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
24 VA C
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OF F
ON
OF F
ON
ZONE 4
PRIORITY
OF F
ON
WWRR
ZONE 1ZONE 1
WR
ZONE 1
WWRR
ZONE 2ZONE 2
WR
ZONE 2
WWRR
ZONE 3ZONE 3
WR
ZONE 3
WWRR
ZONE 4ZONE 4
WR
ZONE 4
PRIORI TYPRIORI TYTHERMOSTATS (24 VAC)THERMOSTATS (24 VAC)
XXXX
ISOLATED
EN D
SW IT CH
ISOLATED
EN D
SW IT CH
XX
ISOLATED
EN D
SW IT CH
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORS12 0 VAC CIRCULATORSINPUT
12 0 VAC
INPUT
12 0 VAC
INPUT
12 0 VAC
HHNN
INPUT
12 0 VAC
HNHHNN
ZONE 4ZONE 4
PRIORI TYPRIORI TY
HN
ZONE 4
PRIORI TY
HHNN
ZONE 3ZONE 3
HN
ZONE 3ZONE 2ZONE 2
HHNN
ZONE 2
HN
ZONE 1ZONE 1
HHNN
ZONE 1
HN
12 0 VAC12 0 VAC
ZCZC ZRZR
HH HH
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORSINPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORSINPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORSINPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORSINPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
WATE R
SUPP LY
O S
COMBI BOILER
WITH MULTIPLE PUMPS
* No Pump Setting Changes Needed With This Configuration
Power
120VAC
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
FLAM ESU PPLY CH PUMP DHW PUMP
LN G L N G L N G L N G
FLAM ESU PPLY CH PUMP DHW PUMP
L
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
24 VA C
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OF F
ON
OF F
ON
ZONE 4
PRIORITY
OF F
ON
WWRR
ZONE 1ZONE 1
WR
ZONE 1
WWRR
ZONE 2ZONE 2
WR
ZONE 2
WWRR
ZONE 3ZONE 3
WR
ZONE 3
WWRR
ZONE 4ZONE 4
WR
ZONE 4
PRIORI TYPRIORI TYTHERMOSTATS (24 VAC)THERMOSTATS (24 VAC)
XXXX
ISOLATED
EN D
SW IT CH
ISOLATED
EN D
SW IT CH
XX
ISOLATED
EN D
SW IT CH
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORS12 0 VAC CIRCULATORSINPUT
12 0 VAC
INPUT
12 0 VAC
INPUT
12 0 VAC
HHNN
INPUT
12 0 VAC
HNHHNN
ZONE 4ZONE 4
PRIORI TYPRIORI TY
HN
ZONE 4
PRIORI TY
HHNN
ZONE 3ZONE 3
HN
ZONE 3ZONE 2ZONE 2
HHNN
ZONE 2
HN
ZONE 1ZONE 1
HHNN
ZONE 1
HN
12 0 VAC12 0 VAC
ZCZC ZRZR
HH HH
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORSINPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORSINPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORSINPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORSINPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
WATE R
SUPP LY
O S
COMBI BOILER
WITH MULTIPLE PUMPS
* No Pump Setting Changes Needed With This Configuration
Power
120VAC

7See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
7See appendix for listing of additional components.
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
FLAM ESU PPLY CH PUMP DHW PUMP
LN G L N G L N G L N G
FLAM ESU PPLY CH PUMP DHW PUMP
L
WATE R
SUPP LY
O S
COMBI BOILER
USING ZONE VALVES
POWER INPOWER IN
SLAVE MASTER
PRIORITY OFF
RESE TNORMAL
POSTPURGEOF F
PRIOR. PROT EC TOF F
PUMP EXERCISE OF F
30 SE C / 2 WK 4 MIN / 24HR
SLAVEMASTER
PRIORITY OFF
RESE TNORMAL
POSTPURGEOF F
PRIOR. PROT EC TOF F
PUMP EXERCISE OF F
30 SE C / 2 WK 4 MIN / 24HR
PRIORI TYPRIORI TY
ZONE 1
1 2 3 4
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZONE VALVE S24 VAC ZONE VALVE SPRIORITY
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZONE VALVE S
FO UR ZO NE EXPANDABL E
ZO NE VA LVE CONTROL
ZVC 40 4-EXP-4
FO UR ZO NE EXPANDABL E
ZO NE VA LVE CONTROL
ZVC 40 4-EXP-4
LED
INDICATO RS
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 1
VALVE 2
VALVE 3
VALVE 4
POWER
T ST AT1
T ST AT2
T ST AT3
T ST AT4
POWER
T ST AT1
T ST AT2
T ST AT3
T ST AT4
LED
INDICATO RS
VALVE 1
VALVE 2
VALVE 3
VALVE 4
POWER
T ST AT1
T ST AT2
T ST AT3
T ST AT4
ZONE 3ZONE 3ZONE 2ZONE 2ZONE 1
THERMOSTATS (24 VAC)THERMOSTATS (24 VAC)
R W CR W CR W CR W CR W CR W C
EXP ANSI ON
A B CA B CX XX XX XX X
MAINMAIN PR IORITY
END SWIT CHEND SWIT CH
1 21 2
NE TNE T
R W C
ZONE 4
PRIORITY
ZONE 3ZONE 2ZONE 1
THERMOSTATS (24 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PR IORITY
END SWIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
SW IT CH
X X
PU MP EN D
SW IT CH
N/ O COM N/C
ZONE 4 PUMP
EN D SW ITCH
X X
PU MP EN D
SW IT CH
N/ O COM N/C
ZONE 4 PUMP
EN D SW ITCH
POWER IN
SLAVE MASTER
PRIORITY OFF
RESE TNORMAL
POSTPURGEOF F
PRIOR. PROT EC TOF F
PUMP EXERCISE OF F
30 SE C / 2 WK 4 MIN / 24HR
PRIORI TY
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZONE VALVE S
FO UR ZO NE EXPANDABL E
ZO NE VA LVE CONTROL
ZVC 40 4-EXP-4
LED
INDICATO RS
VALVE 1
VALVE 2
VALVE 3
VALVE 4
POWER
T ST AT1
T ST AT2
T ST AT3
T ST AT4
ZONE 3ZONE 2ZONE 1
THERMOSTATS (24 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PR IORITY
END SWIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
SW IT CH
N/ O COM N/C
ZONE 4 PUMP
EN D SW ITCH
FU SE
5 AMP
FU SE
5 AMP
FU SE
5 AMP
FU SE
5 AMP
POWER IN
SLAVE MASTER
PRIORITY OFF
RESE TNORMAL
POSTPURGEOF F
PRIOR. PROT EC TOF F
PUMP EXERCISE OF F
30 SE C / 2 WK 4 MIN / 24HR
PRIORI TY
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZONE VALVE S
FO UR ZO NE EXPANDABL E
ZO NE VA LVE CONTROL
ZVC 40 4-EXP-4
LED
INDICATO RS
VALVE 1
VALVE 2
VALVE 3
VALVE 4
POWER
T ST AT1
T ST AT2
T ST AT3
T ST AT4
ZONE 3ZONE 2ZONE 1
THERMOSTATS (24 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PR IORITY
END SWIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
SW IT CH
N/ O COM N/C
ZONE 4 PUMP
EN D SW ITCH
FU SE
5 AMP
FU SE
5 AMP
ACCESSORY
PORT
ACCESSORY
PORT
POWER
CONTROLS
POWER
CONTROLS
POWER
CONTROLS
POWER IN
SLAVE MASTER
PRIORITY OFF
RESE TNORMAL
POSTPURGEOF F
PRIOR. PROT EC TOF F
PUMP EXERCISE OF F
30 SE C / 2 WK 4 MIN / 24HR
PRIORI TY
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZONE VALVE S
FO UR ZO NE EXPANDABL E
ZO NE VA LVE CONTROL
ZVC 40 4-EXP-4
LED
INDICATO RS
VALVE 1
VALVE 2
VALVE 3
VALVE 4
POWER
T ST AT1
T ST AT2
T ST AT3
T ST AT4
ZONE 3ZONE 2ZONE 1
THERMOSTATS (24 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PR IORITY
END SWIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
SW IT CH
N/ O COM N/C
ZONE 4 PUMP
EN D SW ITCH
FU SE
5 AMP
FU SE
5 AMP
ACCESSORY
PORT
POWER
CONTROLS
POWER IN
SLAVE MASTER
PRIORITY OFF
RESE TNORMAL
POSTPURGEOF F
PRIOR. PROT EC TOF F
PUMP EXERCISE OF F
30 SE C / 2 WK 4 MIN / 24HR
PRIORI TY
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZONE VALVE S
FO UR ZO NE EXPANDABL E
ZO NE VA LVE CONTROL
ZVC 40 4-EXP-4
LED
INDICATO RS
VALVE 1
VALVE 2
VALVE 3
VALVE 4
POWER
T ST AT1
T ST AT2
T ST AT3
T ST AT4
ZONE 3ZONE 2ZONE 1
THERMOSTATS (24 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PR IORITY
END SWIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
SW IT CH
N/ O COM N/C
ZONE 4 PUMP
EN D SW ITCH
FU SE
5 AMP
FU SE
5 AMP
ACCESSORY
PORT
POWER
CONTROLS
* No Pump Setting Changes Needed With This Configuration
Power
120VAC
CH2
Thermostat
6 5
Sy s t e m
Sensor
4 3
Modulation
Signal
-+
2 1
CH 2
T hermo sta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
M od b us
+ G -
3 2 1
X7X4
X6X5
CH2
Thermostat
6 5
Sy s t e m
Sensor
4 3
Modulation
Signal
-+
2 1
CH 2
T hermo sta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
M od b us
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
FL AM E SU P PL Y CH PUMP DHW PUMP
LN G L N G L N G L N G
FL AM E SU P PL Y CH PUMP DHW PUMP
L
WATE R
S U P P LY
O S
COMBI BOILER
USING ZONE VALVES
POWER INPOWERIN
SLAVE MASTER
PR IORIT Y OF F
RESET NORMAL
POSTPURGE OF F
PRIOR. PROTECT OF F
PUMP EXERCISE OF F
30 SEC / 2 WK 4 M IN / 2 4 H R
SLAVE MASTER
PR IORIT Y OF F
RESET NORMAL
POSTPURGE OF F
PRIOR. PROTECT OF F
PUMP EXERCISE OF F
30 SEC / 2 WK 4 M IN / 2 4 H R
PR IO RI T YP R IO RI T Y
ZONE 1
1 2 3 4
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZON E VALVE S24 VAC ZONE VALVE S PR IO RI T Y
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZON E VALVE S
FO UR Z O N E EX P AN DA BL E
ZONE VALVE CONTRO L
ZV C 40 4 -E XP-4
FO UR Z O N E EX P AN DA BL E
ZONE VALVE CONTRO L
ZV C 40 4 -E XP-4
LED
INDICATO RS
V AL VE 1
V AL VE 2
V AL VE 3
V AL VE 4
V AL VE 1
V AL VE 2
V AL VE 3
V AL VE 4
POWER
T STAT1
T STAT2
T STAT3
T STAT4
POWER
T STAT1
T STAT2
T STAT3
T STAT4
LED
INDICATO RS
V AL VE 1
V AL VE 2
V AL VE 3
V AL VE 4
POWER
T STAT1
T STAT2
T STAT3
T STAT4
ZONE 3ZONE 3ZONE 2ZONE 2ZONE 1
THERMOSTATS (2 4 VAC)THERMOSTATS (2 4 VAC)
R W CR W CR W CR W CR W CR W C
EXP ANSI ON
A B CA B CX XX XX XX X
MAINMAIN PRIORITY
END S WIT CHEND SWITCH
1 21 2
NE TNE T
R W C
ZONE 4
PRIORITY
ZONE 3ZONE 2ZONE 1
THERMOSTATS (2 4 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PRIORITY
END S WIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
S W IT C H
X X
PU MP EN D
S W IT C H
N/O COM N/C
ZO NE 4 P UM P
EN D SW I TCH
X X
PU MP EN D
S W IT C H
N/O COM N/C
ZO NE 4 P UM P
EN D SW I TCH
POWER IN
SLAVE MASTER
PR IORIT Y OF F
RESET NORMAL
POSTPURGE OF F
PRIOR. PROTECT OF F
PUMP EXERCISE OF F
30 SEC / 2 WK 4 M IN / 2 4 H R
PR IO RI T Y
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZON E VALVE S
FO UR Z O N E EX P AN DA BL E
ZONE VALVE CONTRO L
ZV C 40 4 -E XP-4
LED
INDICATO RS
V AL VE 1
V AL VE 2
V AL VE 3
V AL VE 4
POWER
T STAT1
T STAT2
T STAT3
T STAT4
ZONE 3ZONE 2ZONE 1
THERMOSTATS (2 4 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PRIORITY
END S WIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
S W IT C H
N/O COM N/C
ZO NE 4 P UM P
EN D SW I TCH
FU SE
5 AMP
FU SE
5 AMP
FU SE
5 AMP
FU SE
5 AMP
POWER IN
SLAVE MASTER
PR IORIT Y OF F
RESET NORMAL
POSTPURGE OF F
PRIOR. PROTECT OF F
PUMP EXERCISE OF F
30 SEC / 2 WK 4 M IN / 2 4 H R
PR IO RI T Y
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZON E VALVE S
FO UR Z O N E EX P AN DA BL E
ZONE VALVE CONTRO L
ZV C 40 4 -E XP-4
LED
INDICATO RS
V AL VE 1
V AL VE 2
V AL VE 3
V AL VE 4
POWER
T STAT1
T STAT2
T STAT3
T STAT4
ZONE 3ZONE 2ZONE 1
THERMOSTATS (2 4 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PRIORITY
END S WIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
S W IT C H
N/O COM N/C
ZO NE 4 P UM P
EN D SW I TCH
FU SE
5 AMP
FU SE
5 AMP
ACCESSORY
POR T
ACCESSORY
POR T
POWER
CONTROLS
POWER
CONTROLS
POWER
CONTROLS
POWER IN
SLAVE MASTER
PR IORIT Y OF F
RESET NORMAL
POSTPURGE OF F
PRIOR. PROTECT OF F
PUMP EXERCISE OF F
30 SEC / 2 WK 4 M IN / 2 4 H R
PR IO RI T Y
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZON E VALVE S
FO UR Z O N E EX P AN DA BL E
ZONE VALVE CONTRO L
ZV C 40 4 -E XP-4
LED
INDICATO RS
V AL VE 1
V AL VE 2
V AL VE 3
V AL VE 4
POWER
T STAT1
T STAT2
T STAT3
T STAT4
ZONE 3ZONE 2ZONE 1
THERMOSTATS (2 4 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PRIORITY
END S WIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
S W IT C H
N/O COM N/C
ZO NE 4 P UM P
EN D SW I TCH
FU SE
5 AMP
FU SE
5 AMP
ACCESSORY
POR T
POWER
CONTROLS
POWER IN
SLAVE MASTER
PR IORIT Y OF F
RESET NORMAL
POSTPURGE OF F
PRIOR. PROTECT OF F
PUMP EXERCISE OF F
30 SEC / 2 WK 4 M IN / 2 4 H R
PR IO RI T Y
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZON E VALVE S
FO UR Z O N E EX P AN DA BL E
ZONE VALVE CONTRO L
ZV C 40 4 -E XP-4
LED
INDICATO RS
V AL VE 1
V AL VE 2
V AL VE 3
V AL VE 4
POWER
T STAT1
T STAT2
T STAT3
T STAT4
ZONE 3ZONE 2ZONE 1
THERMOSTATS (2 4 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PRIORITY
END S WIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
S W IT C H
N/O COM N/C
ZO NE 4 P UM P
EN D SW I TCH
FU SE
5 AMP
FU SE
5 AMP
ACCESSORY
POR T
POWER
CONTROLS
*No Pump Setting Changes Needed With This Configuration
Pow er
120VAC
CH2
Thermostat
6 5
Sy s t e m
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
T hermo sta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
M od b us
+ G -
3 2 1
X7X4
X6X5
CH2
Thermostat
6 5
Sy s t e m
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
T hermo sta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
M od b us
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
FL AM E SU P PL Y CH PUMP DHW PUMP
LN G L N G L N G L N G
FL AM E SU P PL Y CH PUMP DHW PUMP
L
WATE R
S U P P LY
O S
COMBI BOILER
USING ZONE VALVES
POWER INPOWERIN
SLAVE MASTER
PR IORIT Y OF F
RESET NORMAL
POSTPURGE OF F
PRIOR. PROTECT OF F
PUMP EXERCISE OF F
30 SEC / 2 WK 4 M IN / 2 4 H R
SLAVE MASTER
PR IORIT Y OF F
RESET NORMAL
POSTPURGE OF F
PRIOR. PROTECT OF F
PUMP EXERCISE OF F
30 SEC / 2 WK 4 M IN / 2 4 H R
PR IO RI T YP R IO RI T Y
ZONE 1
1 2 3 4
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZON E VALVE S24 VAC ZONE VALVE S PR IO RI T Y
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZON E VALVE S
FO UR Z O N E EX P AN DA BL E
ZONE VALVE CONTRO L
Z V C 40 4 -E XP -4
FO UR Z O N E EX P AN DA BL E
ZONE VALVE CONTRO L
Z V C 40 4 -E XP -4
LED
INDICATO RS
V AL VE 1
V AL VE 2
V AL VE 3
V AL VE 4
V AL VE 1
V AL VE 2
V AL VE 3
V AL VE 4
POWER
T STAT1
T STAT2
T STAT3
T STAT4
POWER
T STAT1
T STAT2
T STAT3
T STAT4
LED
INDICATO RS
V AL VE 1
V AL VE 2
V AL VE 3
V AL VE 4
POWER
T STAT1
T STAT2
T STAT3
T STAT4
ZONE 3ZONE 3ZONE 2ZONE 2ZONE 1
THERMOSTATS (2 4 VAC)THERMOSTATS (2 4 VAC)
R W CR W CR W CR W CR W CR W C
EXP ANSI ON
A B CA B CX XX XX XX X
MAINMAIN PRIORITY
END S WIT CHEND SWITCH
1 21 2
NE TNE T
R W C
ZONE 4
PRIORITY
ZONE 3ZONE 2ZONE 1
THERMOSTATS (2 4 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PRIORITY
END S WIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
S W IT C H
X X
PU MP EN D
S W IT C H
N/O COM N/C
ZO NE 4 P UM P
EN D SW I TCH
X X
PU MP EN D
S W IT C H
N/O COM N/C
ZO NE 4 P UM P
EN D SW I TCH
POWER IN
SLAVE MASTER
PR IORIT Y OF F
RESET NORMAL
POSTPURGE OF F
PRIOR. PROTECT OF F
PUMP EXERCISE OF F
30 SEC / 2 WK 4 M IN / 2 4 H R
PR IO RI T Y
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZON E VALVE S
FO UR Z O N E EX P AN DA BL E
ZONE VALVE CONTRO L
Z V C 40 4 -E XP -4
LED
INDICATO RS
V AL VE 1
V AL VE 2
V AL VE 3
V AL VE 4
POWER
T STAT1
T STAT2
T STAT3
T STAT4
ZONE 3ZONE 2ZONE 1
THERMOSTATS (2 4 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PRIORITY
END S WIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
S W IT C H
N/O COM N/C
ZO NE 4 P UM P
EN D SW I TCH
FU SE
5 AMP
FU SE
5 AMP
FU SE
5 AMP
FU SE
5 AMP
POWER IN
SLAVE MASTER
PR IORIT Y OF F
RESET NORMAL
POSTPURGE OF F
PRIOR. PROTECT OF F
PUMP EXERCISE OF F
30 SEC / 2 WK 4 M IN / 2 4 H R
PR IO RI T Y
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZON E VALVE S
FO UR Z O N E EX P AN DA BL E
ZONE VALVE CONTRO L
Z V C 40 4 -E XP -4
LED
INDICATO RS
V AL VE 1
V AL VE 2
V AL VE 3
V AL VE 4
POWER
T STAT1
T STAT2
T STAT3
T STAT4
ZONE 3ZONE 2ZONE 1
THERMOSTATS (2 4 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PRIORITY
END S WIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
S W IT C H
N/O COM N/C
ZO NE 4 P UM P
EN D SW I TCH
FU SE
5 AMP
FU SE
5 AMP
ACCESSORY
POR T
ACCESSORY
POR T
POWER
CONTROLS
POWER
CONTROLS
POWER
CONTROLS
POWER IN
SLAVE MASTER
PR IORIT Y OF F
RESET NORMAL
POSTPURGE OF F
PRIOR. PROTECT OF F
PUMP EXERCISE OF F
30 SEC / 2 WK 4 M IN / 2 4 H R
PR IO RI T Y
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZON E VALVE S
FO UR Z O N E EX P AN DA BL E
ZONE VALVE CONTRO L
Z V C 40 4 -E XP -4
LED
INDICATO RS
V AL VE 1
V AL VE 2
V AL VE 3
V AL VE 4
POWER
T STAT1
T STAT2
T STAT3
T STAT4
ZONE 3ZONE 2ZONE 1
THERMOSTATS (2 4 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PRIORITY
END S WIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
S W IT C H
N/O COM N/C
ZO NE 4 P UM P
EN D SW I TCH
FU SE
5 AMP
FU SE
5 AMP
ACCESSORY
POR T
POWER
CONTROLS
POWER IN
SLAVE MASTER
PR IORIT Y OF F
RESET NORMAL
POSTPURGE OF F
PRIOR. PROTECT OF F
PUMP EXERCISE OF F
30 SEC / 2 WK 4 M IN / 2 4 H R
PR IO RI T Y
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZON E VALVE S
FO UR Z O N E EX P AN DA BL E
ZONE VALVE CONTRO L
Z V C 40 4 -E XP -4
LED
INDICATO RS
V AL VE 1
V AL VE 2
V AL VE 3
V AL VE 4
POWER
T STAT1
T STAT2
T STAT3
T STAT4
ZONE 3ZONE 2ZONE 1
THERMOSTATS (2 4 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PRIORITY
END S WIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
S W IT C H
N/O COM N/C
ZO NE 4 P UM P
EN D SW I TCH
FU SE
5 AMP
FU SE
5 AMP
ACCESSORY
POR T
POWER
CONTROLS
* No Pump Setting Changes Needed With This Configuration
Pow er
120VAC

8See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
8See appendix for listing of additional components.
Ch-2 H ig h Te m p
CH2
6 5
System
Sen sor
4 3
Modulation
Signal
- +
2 1
CH 2
T hermo sta
t
CH1
Th er mosta
t
4 3
Outd oor
Sen sor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
6 5
System
Sen sor
4 3
Modulation
Signal
- +
2 1
CH 2
T hermo sta
t
CH1
Th er mosta
t
4 3
Outd oor
Sen sor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
Th er mos ta t
N G L N G L N G L N G
CH-2 P U MP
P OW ER CH PUMP DHW
PUMP
FL AME
LN G L N G L N G L N G
CH-2 P U MP
P OW ER CH PUMP DHW
PUMP
FL AME
L
Ch-1 L ow TempCh-1 L ow Temp
COMBI BOILER
USING 2 TEMPS / 2 HEATING CURVES
WATE R
SU PP LY
O S
Power
120VAC
* Pump Setting Changes Needed With This Configuration
* *
*(OFF)
Ch-2 H ig h Te m p
CH2
6 5
System
Sen sor
4 3
Modulation
Signal
- +
2 1
CH 2
T hermo sta
t
CH1
Th er mosta
t
4 3
Outd oor
Sen sor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
6 5
System
Sen sor
4 3
Modulation
Signal
- +
2 1
CH 2
T hermo sta
t
CH1
Th er mosta
t
4 3
Outd oor
Sen sor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
Th er mos ta t
N G L N G L N G L N G
CH-2 P U MP
P OW ER CH PUMP DHW
PUMP
FL AME
LN G L N G L N G L N G
CH-2 P U MP
P OW ER CH PUMP DHW
PUMP
FL AME
L
Ch-1 L ow TempCh-1 L ow Temp
COMBI BOILER
USING 2 TEMPS / 2 HEATING CURVES
WATE R
SU PP LY
O S
Power
120VAC
* Pump Setting Changes Needed With This Configuration
* *
* (OFF)
Ch-2 H ig h T em p
CH2
6 5
System
Sen sor
4 3
Modulation
Signal
-+
2 1
CH 2
T hermo sta
t
CH1
Th er most a
t
4 3
Outdoo r
Sen sor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
6 5
System
Sen sor
4 3
Modulation
Signal
-+
2 1
CH 2
T hermo sta
t
CH1
Th er most a
t
4 3
Outdoo r
Sen sor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
Th er mosta t
N G L N G L N G L N G
CH-2 P UMP
P OW ER CH PUMP DHW
PUMP
FLAME
LN G L N G L N G L N G
CH-2 P UMP
P OW ER CH PUMP DHW
PUMP
FLAME
L
Ch-1 L ow TempCh-1 L ow Temp
COMBI BOILER
USING 2 TEMPS / 2 HEATING CURVES
WATE R
SU PP LY
O S
Power
120VAC
* Pump Setting Changes Needed With This Configuration
* *
*(OFF)
**(ON)
**(OFF)

9See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
9See appendix for listing of additional components.
HEAT ONLY BOILER USING A LOW LOSS HEADER
HEAT ONLY BOILER USING CLOSELY SPACED TEES
WATE R
SUPP LY
WATE R
SUPP LY
WATE R
SUPP LY
HEAT ONLY BOILERS
P1
P1
PUMP SELECTION GUIDE (P1)
HEAT ONLY BOILER USING A LOW LOSS HEADER
HEAT ONLY BOILER USING CLOSELY SPACED TEES
WATE R
SUPP LY
WATE R
SUPP LY
WATE R
SUPP LY
HEAT ONLY BOILERS
P1
P1
PUMP SELECTION GUIDE (P1)
HEAT ONLY BOILER USING A LOW LOSS HEADER
HEAT ONLY BOILER USING CLOSELY SPACED TEES
WATE R
SUPP LY
WATE R
SUPP LY
WATE R
SUPP LY
HEAT ONLY BOILERS
P1
P1
PUMP SELECTION GUIDE (P1)
HEAT ONLY BOILER USING A LOW LOSS HEADER
HEAT ONLY BOILER USING CLOSELY SPACED TEES
WATE R
SUPP LY
WATE R
SUPP LY
WATE R
SUPP LY
HEAT ONLY BOILERS
P1
P1
PUMP SELECTION GUIDE (P1)
HEAT ONLY BOILER USING A LOW LOSS HEADER
HEAT ONLY BOILER USING CLOSELY SPACED TEES
WATE R
SUPP LY
WATE R
SUPP LY
WATE R
SUPP LY
HEAT ONLY BOILERS
P1
P1
PUMP SELECTION GUIDE (P1)
HEAT ONLY BOILER USING A LOW LOSS HEADER
HEAT ONLY BOILER USING CLOSELY SPACED TEES
WATE R
SUPP LY
WATE R
SUPP LY
WATE R
SUPP LY
HEAT ONLY BOILERS
P1
P1
PUMP SELECTION GUIDE (P1)
HEAT ONLY BOILERS

10 See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
10 See appendix for listing of additional components.
CH2
6 5
System
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
6 5
System
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
Ther mostat
N G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
L
O S
HEAT ONLY BOILER
SINGLE ZONE WITH CLOSELY SPACED TEES
WATE R
SUPP LY
Power
120VAC
* No Pump Setting Changes Needed With This Configuration
CH2
6 5
System
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
6 5
System
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
Ther mostat
N G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
L
O S
HEAT ONLY BOILER
SINGLE ZONE WITH CLOSELY SPACED TEES
WATE R
SUPP LY
Power
120VAC
* No Pump Setting Changes Needed With This Configuration
CH2
6 5
System
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
6 5
System
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
Ther mostat
N G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
L
O S
HEAT ONLY BOILER
SINGLE ZONE WITH CLOSELY SPACED TEES
WATE R
SUPP LY
Power
120VAC
* No Pump Setting Changes Needed With This Configuration

11See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
11See appendix for listing of additional components.
HEAT ONLY BOILER
SINGLE ZONE WITH LOW LOSS HEADER
* No Pump Setting Changes Needed With This Configuration
CH2
6 5
System
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
6 5
System
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
Ther mostat
N G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
L
HEAT ONLY BOILER
SINGLE ZONE WITH LOW LOSS HEADER
O S
WATE R
SUPP LY
WATE R
SUPP LY
* No Pump Setting Changes Needed With This Configuration
Power
120VAC
CH2
6 5
System
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
6 5
System
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
Thermo sta
t
CH1
Ther mostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor
or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
Ther mostat
N G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
CH-2 PUMP
POWERCH PUMP DHW PUMP
FLAM E
L
HEAT ONLY BOILER
SINGLE ZONE WITH LOW LOSS HEADER
O S
WATE R
SUPP LY
WATE R
SUPP LY
* No Pump Setting Changes Needed With This Configuration
Power
120VAC
CCHH22
66 55
SSystysteemm
SSeennsosorr
44 33
MMoodduullaattiioonn
SSiiggnnaall
-- 22 ++
11
CCHH22
tt
CCHH11
44 33
OOuuttddoooorr
SSeennsosorr
22 11
DDHHWW
SSeennssoorr
oror
AAqquuaassttaatt
22 11
MMooddbbuuss
++ GG --
33 22 11
X7X7X4X4
X6X6X5X5
Thermostat
NN GG LL NN GG LL NN GG LL NN GG
PPOOWWEERR CCHH PPUUMMPP DHW PUMP
FFLLAAMMEE
LL
O S
WWAATTEERR
SSUUPPPPLLYY
Power
120VAC
Thermostat

12 See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
12 See appendix for listing of additional components.
Water
Supply
WATE R
SUPP LY
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
24 VA C
COMLED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OF F
ON
OF F
ON
ZONE 4
PRIORITY
OF F
ON
WWRR
ZONE 1ZONE 1
WR
ZONE 1
WWRR
ZONE 2ZONE 2
WR
ZONE 2
WWRR
ZONE 3ZONE 3
WR
ZONE 3
WWRR
ZONE 4ZONE 4
WR
ZONE 4
PRIORI TYPRIORI TYTHERMOSTATS (24 VAC)THERMOSTATS (24 VAC)
XXXX
ISOLATED
EN D
SW IT CH
ISOLATED
EN D
SW IT CH
XX
ISOLATED
EN D
SW IT CH
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORS12 0 VAC CIRCULATORSINPU T
12 0 VAC
INPU T
12 0 VAC
INPU T
12 0 VAC
HHNN
INPU T
12 0 VAC
HNHHNN
ZONE 4ZONE 4
PRIORI TYPRIORI TY
HN
ZONE 4
PRIORI TY
HHNN
ZONE 3ZONE 3
HN
ZONE 3ZONE 2ZONE 2
HHNN
ZONE 2
HN
ZONE 1ZONE 1
HHNN
ZONE 1
HN
12 0 VAC12 0 VAC
ZCZC ZRZR
HH HH
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORSINPU T
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORSINPU T
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COMLED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORSINPU T
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
-+
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
-+
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
DHW PUMP
SUPPLY CH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
DHW PUMP
SUPPLY CH PUMP DHW PUMP
FLAM E
L
Run 120v SingleWi re From ZC To
L Term in al On Th e Flame Ou tput
&
Remo ve The Jumper Fr om
ZC & ZR
*ONLY For
DH W Priority
O S
HEAT ONLY BOILER
WITH MULTIPLE PUMPS
*
* Pump Setting Changes Needed With This Configuration
* (ON)
Power
120VAC
*SEE NO TE
BELO W
Water
Supply
WATE R
SUPP LY
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
24 VA C
COMLED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OF F
ON
OF F
ON
ZONE 4
PRIORITY
OF F
ON
WWRR
ZONE 1ZONE 1
WR
ZONE 1
WWRR
ZONE 2ZONE 2
WR
ZONE 2
WWRR
ZONE 3ZONE 3
WR
ZONE 3
WWRR
ZONE 4ZONE 4
WR
ZONE 4
PRIORI TYPRIORI TYTHERMOSTATS (24 VAC)THERMOSTATS (24 VAC)
XXXX
ISOLATED
EN D
SW IT CH
ISOLATED
EN D
SW IT CH
XX
ISOLATED
EN D
SW IT CH
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORS12 0 VAC CIRCULATORSINPUT
12 0 VAC
INPU T
12 0 VAC
INPU T
12 0 VAC
HHNN
INPU T
12 0 VAC
HNHHNN
ZONE 4ZONE 4
PRIORI TYPRIORI TY
HN
ZONE 4
PRIORI TY
HHNN
ZONE 3ZONE 3
HN
ZONE 3ZONE 2ZONE 2
HHNN
ZONE 2
HN
ZONE 1ZONE 1
HHNN
ZONE 1
HN
12 0 VAC12 0 VAC
ZCZC ZRZR
HH HH
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORSINPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORSINPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COMLED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORSINPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
DHW PUMP
SUPPLY CH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
DHW PUMP
SUPPLY CH PUMP DHW PUMP
FLAM E
L
Run 120v SingleWire From ZC To
L Term in al On Th e Flame Ou tput
&
Remo ve The Jumper Fr om
ZC & ZR
*ONLY For
DHW Priority
O S
HEAT ONLY BOILER
WITH MULTIPLE PUMPS
*
* Pump Setting Changes Needed With This Configuration
* (ON)
Power
120VAC
*SEE NO TE
BELO W
Water
Supply
WATE R
SUPP LY
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
24 VA C
COMLED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OF F
ON
OF F
ON
ZONE 4
PRIORITY
OF F
ON
WWRR
ZONE 1ZONE 1
WR
ZONE 1
WWRR
ZONE 2ZONE 2
WR
ZONE 2
WWRR
ZONE 3ZONE 3
WR
ZONE 3
WWRR
ZONE 4ZONE 4
WR
ZONE 4
PRIORI TYPRIORI TYTHERMOSTATS (24 VAC)THERMOSTATS (24 VAC)
XXXX
ISOLATED
EN D
SW IT CH
ISOLATED
EN D
SW IT CH
XX
ISOLATED
EN D
SW IT CH
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORS12 0 VAC CIRCULATORSINPUT
12 0 VAC
INPU T
12 0 VAC
INPU T
12 0 VAC
HHNN
INPU T
12 0 VAC
HNHHNN
ZONE 4ZONE 4
PRIORI TYPRIORI TY
HN
ZONE 4
PRIORI TY
HHNN
ZONE 3ZONE 3
HN
ZONE 3ZONE 2ZONE 2
HHNN
ZONE 2
HN
ZONE 1ZONE 1
HHNN
ZONE 1
HN
12 0 VAC12 0 VAC
ZCZC ZRZR
HH HH
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORSINPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORSINPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COMLED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORSINPUT
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
DHW PUMP
SUPPLY CH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
DHW PUMP
SUPPLY CH PUMP DHW PUMP
FLAM E
L
Run 120v SingleWire From ZC To
L Term in al On Th e Flame Ou tput
&
Remo ve The Jumper Fr om
ZC & ZR
*ONLY For
DHW Priority
O S
HEAT ONLY BOILER
WITH MULTIPLE PUMPS
*
* Pump Setting Changes Needed With This Configuration
* (ON)
Power
120VAC
*SEE NO TE
BELO W

13See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
13See appendix for listing of additional components.
Water
Supply
WATE R
SUPP LY
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
-+
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
-+
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
DHW PUMP
SUPPLY CH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
DHW PUMP
SUPPLY CH PUMP DHW PUMP
FLAM E
L
O S
HEAT ONLY BOILER
USING ZONE VALVES
POWER INPOWER IN
SLAVE MASTER
PRIORITY OFF
RESE TNORMAL
POSTPURGEOF F
PRIOR. PROT EC TOF F
PUMP EXERCISE OF F
30 SE C / 2 WK 4 MIN / 24HR
SLAVEMASTER
PRIORITY OFF
RESE TNORMAL
POSTPURGEOF F
PRIOR. PROT EC TOF F
PUMP EXERCISE OF F
30 SE C / 2 WK 4 MIN / 24HR
PRIORI TYPRIORI TY
ZONE 1
1 2 3 4
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZONE VALVE S24 VAC ZONE VALVE SPRIO RI TY
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZONE VALVE S
FO UR ZO NE EXPANDABL E
ZO NE VA LVE CONTROL
ZVC 40 4-EXP-4
FO UR ZO NE EXPANDABL E
ZO NE VA LVE CONTROL
ZVC 40 4-EXP-4
LED
INDICATO RS
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 1
VALVE 2
VALVE 3
VALVE 4
POWER
T ST AT1
T ST AT2
T ST AT3
T ST AT4
POWER
T ST AT1
T ST AT2
T ST AT3
T ST AT4
LED
INDICATO RS
VALVE 1
VALVE 2
VALVE 3
VALVE 4
POWER
T ST AT1
T ST AT2
T ST AT3
T ST AT4
ZONE 3ZONE 3ZONE 2ZONE 2ZONE 1
THERMOSTATS (24 VAC)THERMOSTATS (24 VAC)
R W CR W CR W CR W CR W CR W C
EXP ANSI ON
A B CA B CX XX XX XX X
MAINMAIN PR IORITY
END SWIT CHEND SWIT CH
1 21 2
NE TNE T
R W C
ZONE 4
PRIORITY
ZONE 3ZONE 2ZONE 1
THERMOSTATS (24 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PR IORITY
END SWIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
SW IT CH
X X
PU MP EN D
SW IT CH
N/ O COM N/C
ZONE 4 PUMP
EN D SW ITCH
X X
PU MP EN D
SW IT CH
N/ O COM N/C
ZONE 4 PUMP
EN D SW ITCH
POWER IN
SLAVE MASTER
PRIORITY OFF
RESE TNORMAL
POSTPURGEOF F
PRIOR. PROT EC TOF F
PUMP EXERCISE OF F
30 SE C / 2 WK 4 MIN / 24HR
PRIORI TY
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZONE VALVE S
FO UR ZO NE EXPANDABL E
ZO NE VA LVE CONTROL
ZVC 40 4-EXP-4
LED
INDICATO RS
VALVE 1
VALVE 2
VALVE 3
VALVE 4
POWER
T ST AT1
T ST AT2
T ST AT3
T ST AT4
ZONE 3ZONE 2ZONE 1
THERMOSTATS (24 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PR IORITY
END SWIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
SW IT CH
N/ O COM N/C
ZONE 4 PUMP
EN D SW ITCH
FU SE
5 AMP
FU SE
5 AMP
FU SE
5 AMP
FU SE
5 AMP
POWER IN
SLAVE MASTER
PRIORITY OFF
RESE TNORMAL
POSTPURGEOF F
PRIOR. PROT EC TOF F
PUMP EXERCISE OF F
30 SE C / 2 WK 4 MIN / 24HR
PRIORI TY
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZONE VALVE S
FO UR ZO NE EXPANDABL E
ZO NE VA LVE CONTROL
ZVC 40 4-EXP-4
LED
INDICATO RS
VALVE 1
VALVE 2
VALVE 3
VALVE 4
POWER
T ST AT1
T ST AT2
T ST AT3
T ST AT4
ZONE 3ZONE 2ZONE 1
THERMOSTATS (24 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PR IORITY
END SWIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
SW IT CH
N/ O COM N/C
ZONE 4 PUMP
EN D SW ITCH
FU SE
5 AMP
FU SE
5 AMP
ACCESSORY
PORT
ACCESSORY
PORT
POWER
CONTROLS
POWER
CONTROLS
POWER
CONTROLS
Power
120VAC
*
* Pump Setting Changes Needed With This Configuration
* (ON)
Water
Supply
WATE R
SUPP LY
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
DHW PUMP
SUPPLY CH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
DHW PUMP
SUPPLY CH PUMP DHW PUMP
FLAM E
L
O S
HEAT ONLY BOILER
US
ING ZONE VALVES
POWER INPOWER IN
SLAVE MASTER
PRIORITY OFF
RESE TNORMAL
POSTPURGEOF F
PRIOR. PROT EC TOF F
PUMP EXERCISE OF F
30 SE C / 2 WK 4 MIN / 24HR
SLAVEMASTER
PRIORITY OFF
RESE TNORMAL
POSTPURGEOF F
PRIOR. PROT EC TOF F
PUMP EXERCISE OF F
30 SE C / 2 WK 4 MIN / 24HR
PRIORI TYPRIORI TY
ZONE 1
1 2 3 4
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZONE VALVE S24 VAC ZONE VALVE SPRIORITY
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZONE VALVE S
FO UR ZO NE EXPANDABL E
ZO NE VA LVE CONTROL
ZVC 40 4-EXP-4
FO UR ZO NE EXPANDABL E
ZO NE VA LVE CONTROL
ZVC 40 4-EXP-4
LED
INDICATO RS
VALVE 1
VALVE 2
VALVE 3
VALVE 4
VALVE 1
VALVE 2
VALVE 3
VALVE 4
POWER
T ST AT1
T ST AT2
T ST AT3
T ST AT4
POWER
T ST AT1
T ST AT2
T ST AT3
T ST AT4
LED
INDICATO RS
VALVE 1
VALVE 2
VALVE 3
VALVE 4
POWER
T ST AT1
T ST AT2
T ST AT3
T ST AT4
ZONE 3ZONE 3ZONE 2ZONE 2ZONE 1
THERMOSTATS (24 VAC)THERMOSTATS (24 VAC)
R W CR W CR W CR W CR W CR W C
EXP ANSI ON
A B CA B CX XX XX XX X
MAINMAIN PR IORITY
END SWIT CHEND SWIT CH
1 21 2
NE TNE T
R W C
ZONE 4
PRIORITY
ZONE 3ZONE 2ZONE 1
THERMOSTATS (24 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PR IORITY
END SWIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
SW IT CH
X X
PU MP EN D
SW IT CH
N/ O COM N/C
ZONE 4 PUMP
EN D SW ITCH
X X
PU MP EN D
SW IT CH
N/ O COM N/C
ZONE 4 PUMP
EN D SW ITCH
POWER IN
SLAVE MASTER
PRIORITY OFF
RESE TNORMAL
POSTPURGEOF F
PRIOR. PROT EC TOF F
PUMP EXERCISE OF F
30 SE C / 2 WK 4 MIN / 24HR
PRIORI TY
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZONE VALVE S
FO UR ZO NE EXPANDABL E
ZO NE VA LVE CONTROL
ZVC 40 4-EXP-4
LED
INDICATO RS
VALVE 1
VALVE 2
VALVE 3
VALVE 4
POWER
T ST AT1
T ST AT2
T ST AT3
T ST AT4
ZONE 3ZONE 2ZONE 1
THERMOSTATS (24 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PR IORITY
END SWIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
SW IT CH
N/ O COM N/C
ZONE 4 PUMP
EN D SW ITCH
FU SE
5 AMP
FU SE
5 AMP
FU SE
5 AMP
FU SE
5 AMP
POWER IN
SLAVE MASTER
PRIORITY OFF
RESE TNORMAL
POSTPURGEOF F
PRIOR. PROT EC TOF F
PUMP EXERCISE OF F
30 SE C / 2 WK 4 MIN / 24HR
PRIORI TY
ZONE 1
1 2 3 4
ZONE 2
1 2 3 4
ZONE 3
1 2 3 4
ZONE 4
1 2 3 4
24 VAC ZONE VALVE S
FO UR ZO NE EXPANDABL E
ZO NE VA LVE CONTROL
ZVC 40 4-EXP-4
LED
INDICATO RS
VALVE 1
VALVE 2
VALVE 3
VALVE 4
POWER
T ST AT1
T ST AT2
T ST AT3
T ST AT4
ZONE 3ZONE 2ZONE 1
THERMOSTATS (24 VAC)
R W CR W CR W C
EXP ANSI ON
A B CX XX X
MAIN PR IORITY
END SWIT CH
1 2
NE T
R W C
ZONE 4
PRIORITY
X X
PU MP EN D
SW IT CH
N/ O COM N/C
ZONE 4 PUMP
EN D SW ITCH
FU SE
5 AMP
FU SE
5 AMP
ACCESSORY
PORT
ACCESSORY
PORT
POWER
CONTROLS
POWER
CONTROLS
POWER
CONTROLS
Power
120VAC
*
* Pump Setting Changes Needed With This Configuration
* (ON)

14 See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
Water
Supply
WATE R
SU PP LY
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
24 VA C
COM LE D
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
LED
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
Z O N E 4
PR IORIT Y
OF F
ON
OF F
ON
Z O N E 4
PR IORIT Y
OF F
ON
WWRR
ZONE 1ZONE 1
WR
ZONE 1
WWRR
ZONE 2ZONE 2
WR
ZONE 2
WWRR
ZONE 3ZONE 3
WR
ZONE 3
WWRR
ZONE 4ZONE 4
WR
ZONE 4
PR IO RI T YP R IO RI T YTHERMOSTATS (2 4 VAC)THERMOSTATS (24 VAC)
XXXX
ISO L ATED
EN D
S W IT C H
ISO L ATED
EN D
S W IT C H
XX
ISO L ATED
EN D
S W IT C H
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (24 VAC)
XX
ISO L ATED
EN D
S W IT C H
Z O N E 4
PR IORIT Y
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (24 VAC)
XX
ISO L ATED
EN D
S W IT C H
120 VAC CIRCULATORS120 VAC CIRCULATORS I NPU T
12 0 VA C
I NPU T
12 0 VA C
I NPU T
12 0 VA C
HHNN
I NPU T
12 0 VA C
HNHHNN
ZONE 4ZONE 4
PR IO RI T YP R IO RI T Y
HN
ZONE 4
PR IO RI T Y
HHNN
ZONE 3ZONE 3
HN
ZONE 3ZONE 2ZONE 2
HHNN
ZONE 2
HN
ZONE 1ZONE 1
HHNN
ZONE 1
HN
12 0 VA C12 0 VA C
ZCZC ZRZR
HH HH
12 0 VA C
ZC ZR
H H
120 VAC CIRCULATORS I NPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
120 VAC CIRCULATORS I NPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM LE D
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
Z O N E 4
PR IORIT Y
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (24 VAC)
XX
ISO L ATED
EN D
S W IT C H
120 VAC CIRCULATORS I NPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
CH2
Thermostat
6 5
Sy s t e m
Sensor
4 3
Modulation
Signal
-+
2 1
CH 2
T hermo sta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
M od b us
+ G -
3 2 1
X7X4
X6X5
CH2
Thermostat
6 5
Sy s t e m
Sensor
4 3
Modulation
Signal
-+
2 1
CH 2
T hermo sta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
M od b us
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
DHW PUMP
SU P PLY CH PUMP DHW PUMP
FL AM E
LN G L N G L N G L N G
DHW PUMP
SU P PLY CH PUMP DHW PUMP
FL AM E
L
O S
HEAT ONLY BOILER
WITH MULTIPLE PUMPS
DHW On Boiler Loop
*
Pow er
120VAC
*No Pump Setting Changes Needed With This Configuration
Water
Supply
WATE R
SU PP LY
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
24 VA C
COM LE D
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
LED
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
Z O N E 4
PR IORIT Y
OF F
ON
OF F
ON
Z O N E 4
PR IORIT Y
OF F
ON
WWRR
ZONE 1ZONE 1
WR
ZONE 1
WWRR
ZONE 2ZONE 2
WR
ZONE 2
WWRR
ZONE 3ZONE 3
WR
ZONE 3
WWRR
ZONE 4ZONE 4
WR
ZONE 4
PR IO RI T YP R IO RI T YTHERMOSTATS (2 4 VAC)THERMOSTATS (24 VAC)
XXXX
ISO L ATED
EN D
S W IT C H
ISO L ATED
EN D
S W IT C H
XX
ISO L ATED
EN D
S W IT C H
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (24 VAC)
XX
ISO L ATED
EN D
S W IT C H
Z O N E 4
PR IORIT Y
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (24 VAC)
XX
ISO L ATED
EN D
S W IT C H
120 VAC CIRCULATORS120 VAC CIRCULATORS I NPU T
12 0 VA C
I NPU T
12 0 VA C
I NPU T
12 0 VA C
HHNN
I NPU T
12 0 VA C
HNHHNN
ZONE 4ZONE 4
PR IO RI T YP R IO RI T Y
HN
ZONE 4
PR IO RI T Y
HHNN
ZONE 3ZONE 3
HN
ZONE 3Z O NE 2ZONE 2
HHNN
ZONE 2
HN
ZONE 1ZONE 1
HHNN
ZONE 1
HN
12 0 VA C12 0 V AC
ZCZC ZRZR
HH HH
12 0 VA C
ZC ZR
H H
120 VAC CIRCULATORS I NPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3Z O NE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
120 VAC CIRCULATORS I NPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3Z O NE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM LE D
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
Z O N E 4
PR IORIT Y
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (24 VAC)
XX
ISO L ATED
EN D
S W IT C H
120 VAC CIRCULATORS I NPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3Z O NE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
CH2
Thermostat
6 5
Sy s t e m
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
T hermo sta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
M od b us
+ G -
3 2 1
X7X4
X6X5
CH2
Thermostat
6 5
Sy s t e m
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
T hermo sta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
M od b us
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
DHW PUMP
SU P PLY CH PUMP DHW PUMP
FL AM E
LN G L N G L N G L N G
DHW PUMP
SU P PLY CH PUMP DHW PUMP
FL AM E
L
O S
HEAT ONLY BOILER
WITH MULTIPLE PUMPS
DHW On Boiler Loop
*
Pow er
120VAC
*No Pump Setting Changes Needed With This Configuration
Water
Supply
WATE R
SU PP LY
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
24 VA C
COM LE D
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
LED
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
Z O N E 4
PR IORIT Y
OF F
ON
OF F
ON
Z O N E 4
PR IORIT Y
OF F
ON
WWRR
ZONE 1ZONE 1
WR
ZONE 1
WWRR
ZONE 2ZONE 2
WR
ZONE 2
WWRR
ZONE 3ZONE 3
WR
ZONE 3
WWRR
ZONE 4ZONE 4
WR
ZONE 4
PR IO RI T YP R IO RI T YTHERMOSTATS (2 4 VAC)THERMOSTATS (24 VAC)
XXXX
ISO L ATED
EN D
S W IT C H
ISO L ATED
EN D
S W IT C H
XX
ISO L ATED
EN D
S W IT C H
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (24 VAC)
XX
ISO L ATED
EN D
S W IT C H
Z O N E 4
PR IORIT Y
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (24 VAC)
XX
ISO L ATED
EN D
S W IT C H
120 VAC CIRCULATORS120 VAC CIRCULATORS I NPU T
12 0 VA C
I NPU T
12 0 VA C
I NPU T
12 0 VA C
HHNN
I NPU T
12 0 VA C
HNHHNN
ZONE 4ZONE 4
PR IO RI T YP R IO RI T Y
HN
ZONE 4
PR IO RI T Y
HHNN
ZONE 3ZONE 3
HN
ZONE 3Z O NE 2ZONE 2
HHNN
ZONE 2
HN
ZONE 1ZONE 1
HHNN
ZONE 1
HN
12 0 VA C12 0 V AC
ZCZC ZRZR
HH HH
12 0 VA C
ZC ZR
H H
120 VAC CIRCULATORS I NPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3Z O NE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
120 VAC CIRCULATORS I NPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3Z O NE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM LE D
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
Z O N E 4
PR IORIT Y
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (24 VAC)
XX
ISO L ATED
EN D
S W IT C H
120 VAC CIRCULATORS I NPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3Z O NE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
CH2
Thermostat
6 5
Sy s t e m
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
T hermo sta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
M od b us
+ G -
3 2 1
X7X4
X6X5
CH2
Thermostat
6 5
Sy s t e m
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
T hermo sta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
M od b us
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
DHW PUMP
SU P PLY CH PUMP DHW PUMP
FL AM E
LN G L N G L N G L N G
DHW PUMP
SU P PLY CH PUMP DHW PUMP
FL AM E
L
O S
HEAT ONLY BOILER
WITH MULTIPLE PUMPS
DHW On Boiler Loop
*
Pow er
120VAC
* No Pump Setting Changes Needed With This Configuration

15See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
Water
Supply
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
24 VA C
COM LE D
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
LED
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
Z O N E 4
PR IORIT Y
OF F
ON
OF F
ON
Z O N E 4
PR IORIT Y
OF F
ON
WWRR
ZONE 1ZONE 1
WR
ZONE 1
WWRR
ZONE 2ZONE 2
WR
ZONE 2
WWRR
ZONE 3ZONE 3
WR
ZONE 3
WWRR
ZONE 4ZONE 4
WR
ZONE 4
PR IO RI T YP R IO RI T YTHERMOSTATS (2 4 VAC)THERMOSTATS (24 VAC)
XXXX
ISO L ATED
EN D
S W IT C H
ISO L ATED
EN D
S W IT C H
XX
ISO L ATED
EN D
S W IT C H
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (24 VAC)
XX
ISO L ATED
EN D
S W IT C H
Z O N E 4
PR IORIT Y
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (24 VAC)
XX
ISO L ATED
EN D
S W IT C H
120 VAC CIRCULATORS120 VAC CIRCULATORS I NPU T
12 0 VA C
I NPU T
12 0 VA C
I NPU T
12 0 VA C
HHNN
I NPU T
12 0 VA C
HNHHNN
ZONE 4ZONE 4
PR IO RI T YP R IO RI T Y
HN
ZONE 4
PR IO RI T Y
HHNN
ZONE 3ZONE 3
HN
ZONE 3ZONE 2ZONE 2
HHNN
ZONE 2
HN
ZONE 1ZONE 1
HHNN
ZONE 1
HN
12 0 VA C12 0 VA C
ZCZC ZRZR
HH HH
12 0 VA C
ZC ZR
H H
120 VAC CIRCULATORS I NPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
120 VAC CIRCULATORS I NPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM LE D
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
Z O N E 4
PR IORIT Y
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (24 VAC)
XX
ISO L ATED
EN D
S W IT C H
120 VAC CIRCULATORS I NPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
CH2
Thermostat
6 5
Sy s t e m
Sensor
4 3
Modulation
Signal
-+
2 1
CH 2
T hermo sta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
M od b us
+ G -
3 2 1
X7X4
X6X5
CH2
Thermostat
6 5
Sy s t e m
Sensor
4 3
Modulation
Signal
-+
2 1
CH 2
T hermo sta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
M od b us
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
DHW PUMP
SU P PLY CH PUMP DHW PUMP
FL AM E
LN G L N G L N G L N G
DHW PUMP
SU P PLY CH PUMP DHW PUMP
FL AM E
L
R un 1 20v S in gl e Wi re Fr om Z C T o
L Terminal On The Flame Output
&
R emo v e T he Jum pe r Fr om
ZC & ZR
*ONLY For
DHW Priority
O S
HEAT ONLY BOILER
WITH MULTIPLE PUMPS
Using Closely Spaced Tees
*
* Pump Setting Changes Needed With This Configuration
* (ON)
Pow er
120VAC
*SEE NOTE
B ELO W
WATE R
SU PP LY
Water
Supply
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
24 VA C
COM LE D
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
LED
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
Z O N E 4
PR IORIT Y
OF F
ON
OF F
ON
Z O N E 4
PR IORIT Y
OF F
ON
WWRR
ZONE 1ZONE 1
WR
ZONE 1
WWRR
ZONE 2ZONE 2
WR
ZONE 2
WWRR
ZONE 3ZONE 3
WR
ZONE 3
WWRR
ZONE 4ZONE 4
WR
ZONE 4
PR IO RI T YP R IO RI T YTHERMOSTATS (2 4 VAC)THERMOSTATS (24 VAC)
XXXX
ISO L ATED
EN D
S W IT C H
ISO L ATED
EN D
S W IT C H
XX
ISO L ATED
EN D
S W IT C H
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (24 VAC)
XX
ISO L ATED
EN D
S W IT C H
Z O N E 4
PR IORIT Y
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (24 VAC)
XX
ISO L ATED
EN D
S W IT C H
120 VAC CIRCULATORS120 VAC CIRCULATORS I NPU T
12 0 VA C
I NPU T
12 0 VA C
I NPU T
12 0 VA C
HHNN
I NPU T
12 0 VA C
HNHHNN
ZONE 4ZONE 4
PR IO RI T YP R IO RI T Y
HN
ZONE 4
PR IO RI T Y
HHNN
ZONE 3ZONE 3
HN
ZONE 3Z O NE 2ZONE 2
HHNN
ZONE 2
HN
ZONE 1ZONE 1
HHNN
ZONE 1
HN
12 0 VA C12 0 V AC
ZCZC ZRZR
HH HH
12 0 VA C
ZC ZR
H H
120 VAC CIRCULATORS I NPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3Z O NE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
120 VAC CIRCULATORS I NPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3Z O NE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM LE D
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
Z O N E 4
PR IORIT Y
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (24 VAC)
XX
ISO L ATED
EN D
S W IT C H
120 VAC CIRCULATORS I NPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3Z O NE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
CH2
Thermostat
6 5
Sy s t e m
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
T hermo sta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
M od b us
+ G -
3 2 1
X7X4
X6X5
CH2
Thermostat
6 5
Sy s t e m
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
T hermo sta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
M od b us
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
DHW PUMP
SU P PLY CH PUMP DHW PUMP
FL AM E
LN G L N G L N G L N G
DHW PUMP
SU P PLY CH PUMP DHW PUMP
FL AM E
L
R un 1 20v Sin gl e W i re Fr om ZC To
L Terminal On The Flame Output
&
R emo v e T he Jum per F r om
ZC & ZR
*ONLY For
DHW Priority
O S
HEAT ONLY BOILER
WITH MULTIPLE PUMPS
Using Closely Spaced Tees
*
* Pump Setting Changes Needed With This Configuration
* (ON)
Pow er
120VAC
*SEE NOTE
B ELO W
WATE R
SU PP LY
Water
Supply
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
24 VA C
COM LE D
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
LED
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
Z O N E 4
PR IORIT Y
OF F
ON
OF F
ON
Z O N E 4
PR IORIT Y
OF F
ON
WWRR
ZONE 1ZONE 1
WR
ZONE 1
WWRR
ZONE 2ZONE 2
WR
ZONE 2
WWRR
ZONE 3ZONE 3
WR
ZONE 3
WWRR
ZONE 4ZONE 4
WR
ZONE 4
PR IO RI T YP R IO RI T YTHERMOSTATS (2 4 VAC)THERMOSTATS (24 VAC)
XXXX
ISO L ATED
EN D
S W IT C H
ISO L ATED
EN D
S W IT C H
XX
ISO L ATED
EN D
S W IT C H
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (24 VAC)
XX
ISO L ATED
EN D
S W IT C H
Z O N E 4
PR IORIT Y
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (24 VAC)
XX
ISO L ATED
EN D
S W IT C H
120 VAC CIRCULATORS120 VAC CIRCULATORS I NPU T
12 0 VA C
I NPU T
12 0 VA C
I NPU T
12 0 VA C
HHNN
I NPU T
12 0 VA C
HNHHNN
ZONE 4ZONE 4
PR IO RI T YP R IO RI T Y
HN
ZONE 4
PR IO RI T Y
HHNN
ZONE 3ZONE 3
HN
ZONE 3Z O NE 2ZONE 2
HHNN
ZONE 2
HN
ZONE 1ZONE 1
HHNN
ZONE 1
HN
12 0 VA C12 0 V AC
ZCZC ZRZR
HH HH
12 0 VA C
ZC ZR
H H
120 VAC CIRCULATORS I NPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3Z O NE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
120 VAC CIRCULATORS I NPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3Z O NE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM LE D
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
Z O N E 4
PR IORIT Y
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (24 VAC)
XX
ISO L ATED
EN D
S W IT C H
120 VAC CIRCULATORS I NPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3Z O NE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
CH2
Thermostat
6 5
Sy s t e m
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
T hermo sta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
M od b us
+ G -
3 2 1
X7X4
X6X5
CH2
Thermostat
6 5
Sy s t e m
Sensor
4 3
Modulation
Signal
- +
2 1
CH 2
T hermo sta
t
CH1
Thermostat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
M od b us
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
DHW PUMP
SU P PLY CH PUMP DHW PUMP
FL AM E
LN G L N G L N G L N G
DHW PUMP
SU P PLY CH PUMP DHW PUMP
FL AM E
L
R un 1 20v Sin gl e W i re Fr om ZC To
L Terminal On The Flame Output
&
R emo v e T he Jum per F r om
ZC & ZR
*ONLY For
DHW Priority
O S
HEAT ONLY BOILER
WITH MULTIPLE PUMPS
Using Closely Spaced Tees
*
* Pump Setting Changes Needed With This Configuration
* (ON)
Pow er
120VAC
*SEE NOTE
B ELO W
WATE R
SU PP LY

16 See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
16 See appendix for listing of additional components.
Water
Supply
WATE R
SUPP LY
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
-+
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
-+
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
DHW PUMP
SUPPLY CH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
DHW PUMP
SUPPLY CH PUMP DHW PUMP
FLAM E
L
O S
HEAT ONLY BOILER
USING 2 TEMPS / 2 HEATING CURVES
SR 501-4
ONE ZONE
SWITCHING RELAY
TTTT COMCOM
WWRR 24
VAC
24
VAC
TT COM
WR 24
VAC
33 44LLNN 44
COMCOMN/ON/ON/CN/C
12 0 VAC
INPUT
12 0 VAC
INPUT
3 4LN 4
COMN/ON/C
12 0 VAC
INPUT
66 66 55
N/CN/CN/ON/O
6 6 5
N/CN/OCOMCOM
6 6 5
N/CN/OCOM
LED
INDICATO RS
POWER
ZONE 1
LED
INDICATO RS
POWER
ZONE 1
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
SR 501-4
ONE ZONE
SWITCHING RELAY
TT COM
WR 24
VAC
3 4LN 4
COMN/ON/C
12 0 VAC
INPUT
6 6 5
N/CN/OCOM
LED
INDICATO RS
POWER
ZONE 1
FU SE
6 AMP
FU SE
6 AMP
High Temp
CH-2
Low Temp
CH-1
Low Temp
CH-1
High Temp
CH-2
Power
120VAC
Power
120VAC
NL
* Pump Setting Changes Needed With This Configuration
* (OFF)
* (ON)
Water
Supply
WATE R
SUPP LY
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
DHW PUMP
SUPPLY CH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
DHW PUMP
SUPPLY CH PUMP DHW PUMP
FLAM E
L
O S
HEAT ONLY BOILER
USING 2 TEMPS / 2 HEATING CURVES
SR 501-4
ONE ZONE
SWITCHING RELAY
TTTT COMCOM
WWRR 24
VAC
24
VAC
TT COM
WR 24
VAC
33 44LLNN 44
COMCOMN/ON/ON/CN/C
12 0 VAC
INPUT
12 0 VAC
INPUT
3 4LN 4
COMN/ON/C
12 0 VAC
INPUT
66 66 55
N/CN/CN/ON/O
6 6 5
N/CN/OCOMCOM
6 6 5
N/CN/OCOM
LED
INDICATO RS
POWER
ZONE 1
LED
INDICATO RS
POWER
ZONE 1
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
SR 501-4
ONE ZONE
SWITCHING RELAY
TT COM
WR 24
VAC
3 4LN 4
COMN/ON/C
12 0 VAC
INPUT
6 6 5
N/CN/OCOM
LED
INDICATO RS
POWER
ZONE 1
FU SE
6 AMP
FU SE
6 AMP
High Temp
CH-2
Low Temp
CH-1
Low Temp
CH-1
High Temp
CH-2
Power
120VAC
Power
120VAC
NL
* Pump Setting Changes Needed With This Configuration
* (OFF)
* (ON)
Water
Supply
WATE R
SUPP LY
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
DHW PUMP
SUPPLY CH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
DHW PUMP
SUPPLY CH PUMP DHW PUMP
FLAM E
L
O S
HEAT ONLY BOILER
USING 2 TEMPS / 2 HEATING CURVES
SR 501-4
ONE ZONE
SWITCHING RELAY
TTTT COMCOM
WWRR 24
VAC
24
VAC
TT COM
WR 24
VAC
33 44LLNN 44
COMCOMN/ON/ON/CN/C
12 0 VAC
INPUT
12 0 VAC
INPUT
3 4LN 4
COMN/ON/C
12 0 VAC
INPUT
66 66 55
N/CN/CN/ON/O
6 6 5
N/CN/OCOMCOM
6 6 5
N/CN/OCOM
LED
INDICATO RS
POWER
ZONE 1
LED
INDICATO RS
POWER
ZONE 1
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
SR 501-4
ONE ZONE
SWITCHING RELAY
TT COM
WR 24
VAC
3 4LN 4
COMN/ON/C
12 0 VAC
INPUT
6 6 5
N/CN/OCOM
LED
INDICATO RS
POWER
ZONE 1
FU SE
6 AMP
FU SE
6 AMP
High Temp
CH-2
Low Temp
CH-1
Low Temp
CH-1
High Temp
CH-2
Power
120VAC
Power
120VAC
NL
* Pump Setting Changes Needed With This Configuration
* (OFF)
* (ON)

17See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
17See appendix for listing of additional components.
HEAT ONLY BOILER
USING 0-10 INPUT
* NO Pump Setting Changes Needed With This Configuration
Water
Supply
WATE R
SUPP LY
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
DHW PUMP
SUPPLY CH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
DHW PUMP
SUPPLY CH PUMP DHW PUMP
FLAM E
L
HEAT ONLY BOILER
USING 0-10 INPUT
Power
120VAC
Power
120VAC
Water
Supply
WATE R
SUPP LY
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
CH2
Thermo stat
6 5
Sy stem
Sensor
4 3
Modulation
Si gnal
- +
2 1
CH 2
Thermo sta
t
CH1
Thermo stat
4 3
Outdoor
Sensor
2 1
DHW
Sensor or
Aquastat
2 1
Modbus
+ G -
3 2 1
X7X4
X6X5
N G L N G L N G L N G
DHW PUMP
SUPPLY CH PUMP DHW PUMP
FLAM E
LN G L N G L N G L N G
DHW PUMP
SUPPLY CH PUMP DHW PUMP
FLAM E
L
* NO Pump Setting Changes Needed With This Configuration
Power
120VAC
Power
120VAC
SSIIXX ZZOONNEE SSWWIITTCCHHIINNGG RREELLAAYY
SSRR 550066--44
FUFUFUFUFUFUFU SSSSSSSEEEEEEE
6666666 AAAAAAAMMMMMMM PPPPPPP
FUFUFUFUFUFU SSSSSSEEEEEE
666666 AAAAAAMMMMMMPPPPPP
FUFUFUFUFUFU SSSSSSEEEEEE
666666 AAAAAAMMMMMMPPPPPP
FUFUFUFUFUFU SSSSSSEEEEEE
666666 AAAAAAMMMMMMPPPPPP
FUFUFUFUFUFU SSSSSSEEEEEE
666666 AAAAAAMMMMMMPPPPPP
FUFUFUFUFUFU SSSSSSEEEEEE
666666 AAAAAAMMMMMMPPPPPP
FUFUFUFUFUFU SSSSSSEEEEEE
666666 AAAAAAMMMMMMPPPPPP
222444 VVVAAACCC
CCCOOOMMM
LLLEEEDDD
IIINNNDDDIIICCCAAA TTTOOO RRRSSS
PPPPOOOOWWWWEEEERRRR
ZZZZ OOOONNNNEEEE 1111
ZZZZ OOOONNNNEEEE 2222
ZZZZ OOOONNNNEEEE 3333
ZZZZOOOONNNNEEEE 4444
ZZZZOOOONNNNEEEE 5555
ZZZZ OOOONNNNEEEE 6666
ZCZCZCZC ZRZRZRZR
HHHH HHHH
111122220000 VVVVAAAACCCC IIIIIINNNNNNPPPPPPUUUUUUTTTTTT
111111222222000000 VVVVVVAAAAAACCCCCC
HHHHHNNNNNHHHHHNNNNN
ZZZZZOOOOONNNNNEEEEE 11111
HHHHHNNNNN
ZOZOZOZOZONNNNNEEEEE 22222
HHHHHNNNNN
111112222200000 VVVVVAAAAACCCCC CCCCCIIIIIRRRRRCCCCCUUUUULLLLLAAAAATOTOTOTOTORRRRRSSSSS
ZOZOZOZONNNNEEEE 3333
HHHHNNNN
ZOZOZOZONNNNEEEE 4444
HHHHNNNN
ZOZOZOZONNNNEEEE 5555
HHHHNNNN
ZOZOZOZONNNNEEEE 6666
PPPPRRRRIIIIOOOORRRRIIIITYTYTYTY
ZZZZ OOOONNNNEEEE 6666
PPPPRRRRIIIIOOOORRRRIIIITTTTYYYY
OOOOOFFFFF FFFFF
ONONONONON
WWWWWWWRRRRRRR
ZZZZZZZOOOOOOONNNNNNNEEEEEEE 1111111
WWWWWWWRRRRRRR
ZOZOZOZOZOZOZONNNNNNNEEEEEEE 2222222
WWWWWWWRRRRRRR
ZOZOZOZOZOZOZONNNNNNNEEEEEEE 3333333
WWWWWWWRRRRRRR
ZOZOZOZOZOZOZONNNNNNNEEEEEEE 4444444
WWWWWWWRRRRRRR
ZOZOZOZOZOZOZONNNNNNNEEEEEEE 5555555
WWWWWWWRRRRRRR
ZOZOZOZOZOZOZONNNNNNNEEEEEEE 6666666
PPPPPPRRRRRRIIIIIIOOOOOORRRRRRIIIIIITYTYTYTYTYTYTHTHTHTHTHTHEEEEEERRRRRRMMMMMMOOOOOOSSSSSSTATATATATATATTTTTTSSSSSS ((((((222222444444 VVVVVVAAAAAACCCCCC))))))
XXXXXXXXXXXX
IIIIII SSSSSSOOOOOOLLLLLL AAAAAATETETETETETEDDDDDD
EEEEEENNNNNN DDDDDD
SSSSSSWWWWWW IIIIIITTTTTT CCCCCCHHHHHH
WATER
SUPPLY
CCHH22
TThheerrmmoossttaatt
66 55
SSyysstteemm
SSeennssoorr
44 33
MMoodduullaattiioonn
SSiiggnnaall
-- 22 ++
11
CCHH22
TThheerrmmoossttaa
tt
CCHH11
TThheerrmmoossttaatt
44 33
OOuuttddoooorr
SSeennssoorr
22 11
DDHHWW
SSeennssoorr oorr
AAqquuaassttaatt
22 11
MMooddbbuuss
++ GG --
33 22 11
X7X7X4X4
X6X6X5X5
NN GG LL NN GG LL NN GG LL NN GG
DD
DD
HH
HH
WW
WW
PP
PP
UU
SSUUPPPPLLYY CCHHPPUUMMPP
FFLLAAMMEE
LL
O S
HEAT ONLY BOILER
WITH BUFFER TANK
DHW On Boiler Loop
*
Power
120VAC
* No Pump Setting Changes Needed With This Configuration
WATER
SUPPLY
DHW PUMP

18 See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
18 See appendix for listing of additional components.
PIPING
Note: Communicaon Cable Needed For Each Follower Boiler
CH
P um p
CH
P um p
CH
P um p
DHW
P um p
DHW
Sensor
or
Aquastat
Sy st em
Sensor
FOUR ZONE SWITCHING RELAY
SR 50 4 -4
24 VA C
COM
24 VA C
COM LE D
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
LED
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
Z O N E 4
PR IORIT Y
OF F
ON
OF F
ON
Z O N E 4
PR IORIT Y
OF F
ON
WWRR
ZONE 1ZONE 1
WR
ZONE 1
WWRR
ZONE 2ZONE 2
WR
ZONE 2
WWRR
ZONE 3ZONE 3
WR
ZONE 3
WWRR
ZONE 4ZONE 4
WR
ZONE 4
PR IO RI T YP R IO RI T YTHERMOSTATS (2 4 VAC)THERMOSTATS (2 4 VAC)
XXXX
ISO L ATED
EN D
S W IT C H
ISO L ATED
EN D
S W IT C H
XX
ISO L ATED
EN D
S W IT C H
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (2 4 VAC)
XX
ISO L ATED
EN D
S W IT C H
Z O N E 4
PR IORIT Y
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (2 4 VAC)
XX
ISO L ATED
EN D
S W IT C H
120 VAC CIRCULATORS120 VAC CIRCULATORS I NPU T
12 0 VA C
I NPU T
12 0 VA C
I NPU T
12 0 VA C
HHNN
I NPU T
12 0 VA C
HNHHNN
ZONE 4ZONE 4
PR IO RI T YP R IO RI T Y
HN
ZONE 4
PR IO RI T Y
HHNN
ZONE 3ZONE 3
HN
ZONE 3ZONE 2ZONE 2
HHNN
ZONE 2
HN
ZONE 1ZONE 1
HHNN
ZONE 1
HN
12 0 VA C12 0 V AC
ZCZC ZRZR
HH HH
12 0 VA C
ZC ZR
H H
120 VAC CIRCULATORS INPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
120 VAC CIRCULATORS INPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4 -4
24 VA C
COM LE D
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
Z O N E 4
PR IORIT Y
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (2 4 VAC)
XX
ISO L ATED
EN D
S W IT C H
120 VAC CIRCULATORS INPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
Leader
B1
Follower
B2
Follower
B3
PIPING
3 EXALT BOILERS CASCADED
* Pump Setting Changes Needed With This Configuration
* (ON)
* Pump Settings Need To Be Changed On All Boilers
Note: Communication Cable Needed For Each Slave Boiler
PIPING
3 EXALT BOILERS CASCADED
* (ON)
Note: Communication Cable Needed For Each Slave Boiler
CH
P um p
CH
P um p
CH
P um p
DHW
P um p
DHW
Sensor
or
Aquastat
Sy st em
Sensor
FOUR ZONE SWITCHING RELAY
SR 50 4 -4
24 VA C
COM
24 VA C
COM LE D
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
LED
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
Z O N E 4
PR IORIT Y
OF F
ON
OF F
ON
Z O N E 4
PR IORIT Y
OF F
ON
WWRR
ZONE 1ZONE 1
WR
ZONE 1
WWRR
ZONE 2ZONE 2
WR
ZONE 2
WWRR
ZONE 3ZONE 3
WR
ZONE 3
WWRR
ZONE 4ZONE 4
WR
ZONE 4
PR IO RI T YP R IO RI T YTHERMOSTATS (2 4 VAC)THERMOSTATS (2 4 VAC)
XXXX
ISO L ATED
EN D
S W IT C H
ISO L ATED
EN D
S W IT C H
XX
ISO L ATED
EN D
S W IT C H
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (2 4 VAC)
XX
ISO L ATED
EN D
S W IT C H
Z O N E 4
PR IORIT Y
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (2 4 VAC)
XX
ISO L ATED
EN D
S W IT C H
120 VAC CIRCULATORS120 VAC CIRCULATORS I NPU T
12 0 VA C
I NPU T
12 0 VA C
I NPU T
12 0 VA C
HHNN
I NPU T
12 0 VA C
HNHHNN
ZONE 4ZONE 4
PR IO RI T YP R IO RI T Y
HN
ZONE 4
PR IO RI T Y
HHNN
ZONE 3ZONE 3
HN
ZONE 3ZONE 2ZONE 2
HHNN
ZONE 2
HN
ZONE 1ZONE 1
HHNN
ZONE 1
HN
12 0 VA C12 0 V AC
ZCZC ZRZR
HH HH
12 0 VA C
ZC ZR
H H
120 VAC CIRCULATORS INPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
120 VAC CIRCULATORS INPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4 -4
24 VA C
COM LE D
INDICATO RS
POWER
Z O N E 1
Z O N E 2
Z O N E 3
Z O N E 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
Z O N E 4
PR IORIT Y
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PR IO RI T YTHERMOSTATS (2 4 VAC)
XX
ISO L ATED
EN D
S W IT C H
120 VAC CIRCULATORS INPU T
12 0 VA C
HNHN
ZONE 4
PR IO RI T Y
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VA C
ZC ZR
H H
Leader
B1
Follower
B2
Follower
B3
PIPING
3 EXALT BOILERS CASCADED
* Pump Setting Changes Needed With This Configuration
*ON
* Pump Settings Need To Be Changed On All Boilers
Note: Communication Cable Needed For Each Slave Boiler
CH
Pump CH
Pump
CH
Pump
DHW
Pump
DHW
Sensor
or
Aquastat
System
Sensor
FFOOUURRZZOONNEESSWWIITTCCHHIINNGGRREELLAAYY
SSRR550044--44
222444VVVAAACCC
CCCOOOMMMLLLEEEDDD
INDDDICAAATTTOOO RRRSSS
PPPOOOWWWEEERRR
ZZZOOONNNEEE111
ZZZOOONNNEEE222
ZZZOOONNNEEE333
ZZZOOONNNEEE444
FUFUFUFUFU SSSSSEEEEE
66666
AAAAAMMMMMPPPPP
FUFUFUFUFU SSSSSEEEEE
66666
AAAAAMMMMMPPPPP
FUFUFUFUFU SSSSSEEEEE
66666
AAAAAMMMMMPPPPP
FUFUFUFUFU SSSSSEEEEE
66666
AAAAAMMMMMPPPPP
FUFUFUFUFU SSSSSEEEEE
66666
AAAAAMMMMMPPPPP
ZZZZOOOONNNNEEEE4444
PPPPRRRRIORRRRITTTTYYYY
OOOOOFFFFFFFFFF
ONONONONON
W
W
W
W
WW
R
R
R
R
RR
ZZZZZZOOOOOONNNNNNEEEEEE
111111
W
W
W
W
WW
R
R
R
R
RR
ZOZOZOZOZOZONNNNNNEEEEEE222222
W
W
W
W
WW
R
R
R
R
RR
ZOZOZOZOZOZONNNNNNEEEEEE333333
W
W
W
W
WW
R
R
R
R
RR
ZOZOZOZOZOZONNNNNNEEEEEE
444444
PPPPPRRRRRIIIIIOOOOORRRRRIIIIITYTYTYTYTY
THTHTHTHTHEEEEERRRRRMMMMMOOOOOSSSSSTATATATATATTTTTSSSSS(((((2222244444VVVVVAAAAACCCCC)))))
X
X
X
X
XX
X
X
X
X
XX
ISOOOOOOLLLLLLAAAAAATETETETETETEDDDDDD
EEEEEENNNNNN DDDDDD
SSSSSSWWWWWW IT CCCCCCHHHHHH
111112222200000 VVVVVAAAAACCCCC CCCCCIIIIIRRRRRCCCCCUUUUULLLLLAAAAATOTOTOTOTORRRRRSSSSSIIIIIIINNNNNNNPPPPPPPUUUUUUUTTTTTTT
111111122222220000000 VVVVVVVAAAAAAACCCCCCC
H
H
H
H
HH
N
N
N
N
NN
H
H
H
H
HH
N
N
N
N
NN
ZOZOZOZOZOZONNNNNNEEEEEE 444444
PPPPPPRRRRRRIIIIIIOOOOOORRRRRRIIIIIITYTYTYTYTYTY
H
H
H
H
HH
N
N
N
N
NN
ZOZOZOZOZOZONNNNNNEEEEEE 333333ZOZOZOZOZOZONNNNNNEEEEEE 222222
H
H
H
H
HH
N
N
N
N
NN
ZOZOZOZOZOZONNNNNNEEEEEE 111111
H
H
H
H
HH
N
N
N
N
NN
111111222222000000 VVVVVVAAAAAACCCCCC
ZCZCZCZCZCZC ZRZRZRZRZRZR
H
H
H
H
HH
H
H
H
H
HH
Leader
B1
Follower
B2
Follower
B3

19See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
CH
PUMP
CH 2
Thermostat
System
Sensor
Modu latio
n Signal
CH2
Thermost
at
CH 1
Thermostat
Outdoor
Sensor
DHW
Sensor or
Aquastat
Modb us
CH 2
Thermostat
System
Sensor
Modu latio
n Signal
CH2
Thermost
at
CH 1
Thermostat
Outdoor
Sensor
DHW
Sensor or
Aquastat
Modb us
CH 2
Thermostat
System
Sensor
Modu latio
n Signal
CH2
Ther most
at
CH 1
Thermostat
Outdoor
Sensor
DHW
Sensor or
Aquastat
Modb us
Main Control
Board
B-2
Back of Display
Panel
B-2
Back of Display
Panel
B-3
Relay
End switch
Optional
Outdoor
Sensor
DHW
Sensor
System Sensor
Main Control
Board
B-1
N G L N G L N G L N G
FLAME SUPPLY CH PUMP DH W PUMP
L
N G L N G L N G L N G
FLAME SUPPLY CH PUMP DH W PUMP
L
N G L N G L N G L N G
FLAME SUPPLY CH PUMP DH W PUMP
L
Leader Boiler B-1
Follower Boiler B-2
Follower Boiler B-3
LINE
POWER
120V
LINE
POWER
120V
LINE
POWER
120V
CH
PUMP
CH
PUMP
DHW
PUMP
WIRING
3 EXALT BOILERS CASCADED
*COMMUNICATION CABLE
PART# GA CAB01
*COMMUNICATION CABLE
PART# GA CAB01
Relay
End Switch
19See appendix for listing of additional components.
WIRING
CH
Pump
CH
Pump
CH
Pump
DHW
Pump
DHW
Sensor
or
Aquastat
Sy stem
Sensor
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COM
24 VA C
COMLED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
LED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OF F
ON
OF F
ON
ZONE 4
PRIORITY
OF F
ON
WWRR
ZONE 1ZONE 1
WR
ZONE 1
WWRR
ZONE 2ZONE 2
WR
ZONE 2
WWRR
ZONE 3ZONE 3
WR
ZONE 3
WWRR
ZONE 4ZONE 4
WR
ZONE 4
PRIORI TYPRIORITYTHERMOSTATS (24 VAC)THERMOSTATS (24 VAC)
XXXX
ISOLATED
EN D
SW IT CH
ISOLATED
EN D
SW IT CH
XX
ISOLATED
EN D
SW IT CH
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORS12 0 VAC CIRCULATORSINPUT
12 0 VAC
INPU T
12 0 VAC
INPU T
12 0 VAC
HHNN
INPU T
12 0 VAC
HNHHNN
ZONE 4ZONE 4
PRIORI TYPRIORI TY
HN
ZONE 4
PRIORI TY
HHNN
ZONE 3ZONE 3
HN
ZONE 3ZONE 2ZONE 2
HHNN
ZONE 2
HN
ZONE 1ZONE 1
HHNN
ZONE 1
HN
12 0 VAC12 0 VAC
ZCZC ZRZR
HH HH
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORSINPU T
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
12 0 VAC CIRCULATORSINPU T
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
FOUR ZONE SWITCHING RELAY
SR 50 4-4
24 VA C
COMLED
INDICATO RS
POWER
ZONE 1
ZONE 2
ZONE 3
ZONE 4
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
FU SE
6 AMP
ZONE 4
PRIORITY
OF F
ON
WR
ZONE 1
WR
ZONE 2
WR
ZONE 3
WR
ZONE 4
PRIORI TYTHERMOSTATS (24 VAC)
XX
ISOLATED
EN D
SW IT CH
12 0 VAC CIRCULATORSINPU T
12 0 VAC
HNHN
ZONE 4
PRIORI TY
HN
ZONE 3ZONE 2
HN
ZONE 1
HN
12 0 VAC
ZC ZR
H H
Leader
B1
Follower
B2
Follower
B3
PIPING
3 EXALT BOILERS CASCADED
*Pump Setting Changes Needed With This Configuration
*(ON)
*Pump Settings Need To Be Changed On All Boilers
d
Fll
Fll
Note: Communica tion Cable Needed For Each Slave Boiler
* COMMUNICATION CABLE NEEDED FOR EVERY FOLLOWER BOILER

20 See appendix for listing of additional components.
Quick Reference Boiler Piping and Wiring Guide
20
QUICK REFERENCE GUIDE
QUICK REFERENCE GUIDE
Model Number BTUs DHW Webb Number
Exalt 155 Combi 19,375 - 155,000 4.0 GPM* 786159
Exalt 199 Combi 24,875 - 199,000 5.3 GPM* 786161
Exalt 110 Heat Only 13,750 - 110,00 NA 786157
Exalt 155 Heat Only 19,375 - 155,000 NA 786158
Exalt 199 Heat Only 24,875 - 199,000 NA 786160
Gallant 250 43,600 - 240,000 NA 786162
Gallant 299 72,500 - 299,000 NA 786163
Gallant 399 72,500- 399,000 NA 786164
**Based on a 70 Degree Rise and all boilers ship with a LP conversion ki