Taco SR501 User manual

TACO ZONE CONTROLS WIRING GUIDE
Pages
Switching Relays – Single Zone Wiring 2 – 2
Switching Relays – Oil Boiler Wiring Safety Notice 2 3– 4
Switching Relays – NON EXP Connected Together with Priority 5 – 11
Switching Relays – EXP Connected Together with Priority 12 – 14
Switching Relays – Multiple Indirect Hot Water Heaters 15 – 16
Switching Relays – EXP Connected To Reset Controls (PC700, 702 & 705) 17 – 28
Zone Valve Controls – NON EXP Connected Together with Priority 29 – 34
Zone Valve Controls – EXP Connected Together with Priority 35 – 38
Zone Valve Controls – Connected To Reset Controls (PC700, 702 & 705) 39 – 46
Hydro Air Fan Controls (HAFC 101 & 201) 47 – 51
Specialty Thermostat and Zone Valve Wiring 52 – 56
Radiant Mixing Block 57 – 58
X-Pump Block 59 – 61
iSeries Mixing Valves 62 – 63
Low Water Cutoffs and Electric Water Feeders 64 – 79
Aquastat Wiring 80 – 86
Instruction Sheets 87 – 97
Standard Terms and Definitions –98
Cross Reference 99 – 100
Do it once.
Do it right.
© Taco Catalog No. 100-9.0 Effective Date: July 1, 2010
Supersedes Date: July 1, 2007

TACO Zone Control Product Information
Switching Relays
Product No. Description
SR501 1 Zone Switching Relay
SR501-845RP 1 Zone Switching Relay Replacement PC Board for
Honeywell R845, RA89A, RA832 or Comparable Relay
SR502 2 Zone Switching Relay with Priority
SR503 3 Zone Switching Relay with Priority
SR504 4 Zone Switching Relay with Priority
SR506 6 Zone Switching Relay with Priority
Switching Relays with PowerPort Options and Expandable to 20 Zones
Product No. Description
SR501-EXP 1 Zone Switching Relay
SR503-EXP 3 Zone Switching Relay with Priority and 3 PowerPorts
SR504-EXP 4 Zone Switching Relay with Priority and 3 PowerPorts
SR506-EXP 6 Zone Switching Relay with Priority and 3 PowerPorts
Zone Valve Controls
Product No. Description
ZVC403 3 Zone Valve Control
ZVC404 4 Zone Valve Control with Priority
ZVC405 5 Zone Valve Control
ZVC406 6 Zone Valve Control with Priority
Zone Valve Controls with PowerPort Options and Expandable to 20 Zones
Product No. Description
ZVC404-EXP 4 Zone Valve Control with Priority and 2 PowerPorts
ZVC406-EXP 6 Zone Valve Control with Priority and 2 PowerPorts
Plug-In PowerPort Cards (For use with all -EXP controls)
Product No. Description
PC600 Post Purge Timer Plug-In Card
PC605 Priority Protection Plug-In Card
PC610 Universal Timer/Pump Exercise Plug-In Card
Add-On Power Controls (For use with all -EXP controls)
Product No. Description
PC700 Boiler Reset Control
PC702 2-Stage Boiler Reset Control
PC705 Variable Speed Pump Injection Mixing Control
Fan Controls
Product No. Description
HAFC101 Hydro Air Fan Control
HAFC201 Hydro Air Fan Control with Optional Time Delays
Do it once.
Do it right.

2
AT
TO: 120 VAC POWER
CIRCULATOR
120 VAC
INPUT
THERMOST
RW
TT
COM
24
VAC
N/O N/C N/C N/O
NH3 44665
TO: ZC
SR501
1 ZONE
SWITCHING RELAY
POWER T STAT
TO: ZR
ALTERNATIVE WIRING
(TANKLESS COIL)
T
SR501 Switching Relay Wiring
AT
TO: 120 VAC
POWER
CIRCULATOR
JUMPER
120 VAC
INPUT
THERMOST
RW
TT
COM
24
VAC
N/O N/C N/C N/O
NH3 44665
TO: TT ON BOILER
SR501
1 ZONE
SWITCHING RELAY
POWER T STAT
TYPICAL WIRING
(COLD START)
T
TO: 120 VAC POWER
CIRCULATOR
RW
TT
COM
24
VAC
N/O N/C N/C N/O
NH3 44665
TO: TT ON BOILER
SR501
1 ZONE
SWITCHING RELAY
POWER * T STAT *
ALTERNATIVE WIRING
(24 VAC POWERED INPUT SIGNAL)
N
H
REMOVE JUMPER. DO NOT CONNECT POWER TO N AND H TERMINALS.
* T STAT LIGHT WILL GO
ON AND OFF WITH 24 VAC SIGNAL. POWER LIGHT WILL ALWAYS BE OFF.
24 VAC SIGNAL
Note: When using Alternative Wiring diagram, the boiler oper- ating control’s ZC terminal will see the load of the circulator(s). Warning: When using Alternative Wiring diagram, wiring instructions must be followed so power originates from the boiler aquastat. Failure to follow these wiring instructions may result in a secondary source of power being connected to the boiler that may activate it under certain circumstances, causing injury or death.

NOTE: No tankless coil priority.
3

(cont.)
NOTE: Tankless coil has priority.
THREE ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
THERMOSTAT
FUSE 1 AMP
24 VAC
POWER
ZONE 1 ZONE 2 ZONE 3
120 VOLT CIRCULATORS
ZC X1
ZONE1 ZONE2 ZONE3
SR 503
ZONE 2
POWER
ZONE 1
ZONE 3
L1 L2 T T
LINE VOLTAGE
OIL BURNER RELAY
CIRCULATOR
ON BOILER
(IF ATTACHED)
B2
C1
B1ZR
HONEYWELL L8124
OR EQUAL
120 VAC INPUT
C2
ZC
THERMOSTAT
L1 L2
(NEUTRAL)(HOT)
CIRCUIT
BREAKER
CUSTOMER
EMERGENCY
SWITCH
THERMAL
FUSE
(FIROMATIC)
SERVICE
SWITCH
LOW
WATER
CUTOFF
NP H X2
ZR
NOTE: The boiler operating control’s ZC terminal will see the load of the circulator(s).
FOUR ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
THERMOSTATS
ZONE 4
ON
OFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VOLT CIRCULATORS
ZC ZR
X X
END
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
L1 L2 T T
LINE VOLTAGE
OIL BURNER RELAY
CIRCULATOR
ON BOILER
(IF ATTACHED)
B2
C1
B1ZR
HONEYWELL L8124
OR EQUAL
120 VAC INPUT
C2
ZC
THERMOSTAT
L1 L2
(NEUTRAL)(HOT)
CIRCUIT
BREAKER
CUSTOMER
EMERGENCY
SWITCH
THERMAL
FUSE
(FIROMATIC)
SERVICE
SWITCH
LOW
WATER
CUTOFF
4

5
SR502/503 Switching Relay Controlling Another SR502/503 Switching Relay
SR 503
24 VAC
POWER
FUSE 1 AMP
ZONE1 ZONE2 ZONE3
120 VOLT CIRCULATORS
ZONE1 ZONE2 ZONE3
TO: "TT" ON AQUASTAT CONTROL
JUMPER
N P ZC H X ZR
1
X
2
ZONE 2
POWER
ZONE 1
ZONE 3
THREE ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
TT T
SR 503
ZONE1 ZONE2 ZONE3
24 VAC
POWER
FUSE 1 AMP
120 VOLT
CIRCULATORS
ZONE1 ZONE2 ZONE3
120 VAC POWER
JUMPER
N P ZC H X ZR
1
X
2
THREE ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
T
AT
BOILER
H
N
SLAVE
MASTER
AQUASTAT
ON DHW
HEATER
ZONE 2
POWER
ZONE 1
ZONE 3
DHW
HEATER
CIRCULATOR
PRIORITY ON
VIA JUMPER
PLACEMENT
PRIORITY OFF
VIA JUMPER
PLACEMENT

6
SR502/503 Switching Relay Controlling Another SR504/506 Switching Relay
SIX ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
ZONE 6
ON
OFF
PRIORITY
120V RELAY
120 VOLT CIRCULATORS
ZC ZR
X X
END
SWITCH
POWER
INPUT
120 VAC INPUT
TO: "TT" ON BOILER
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
FUSE 1 AMP
24 VAC
POWER
SR 506
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
ZONE 5
ZONE 6
THERMOSTATS
BOILER
H
N
SR 503
ZONE1 ZONE2 ZONE3
24 VAC
POWER
FUSE 1 AMP
120 VOLT
CIRCULATORS
ZONE1 ZONE2 ZONE3
JUMPERS
N P ZC H X ZR
1
X
2
THREE ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
T
AT
MASTER
ZONE 2
POWER
ZONE 1
ZONE 3
SLAVE
T
PRIORITY ON
VIA JUMPER
PLACEMENT
REMOVE
JUMPER
PRIORITY
OFF
AQUASTAT
ON DHW
HEATER

7
Two SR504/506 Switching Relays Connected Together
BOILER
H
N
A
AQUASTAT ON
DHW HEATER
TT T
FOUR ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
ZONE 4
ON
OFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
120 VOLT CIRCULATORS
ZC ZR
X X
END
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
JUMPER
TT T
FOUR ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
ZONE 4
ON
OFF
PRIORITY
120V RELAY
FUSE 1 AMP
24 VAC
POWER
ZONE 1 ZONE 2 ZONE 3 ZONE 4
120 VAC INPUT
TO: "TT" ON BOILER
120 VOLT CIRCULATORS
ZC ZR
X X
END
SWITCH
ZONE1 ZONE2 ZONE3 ZONE4 POWER
INPUT
SR 504
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
JUMPER
DHW
HEATER
CIRCULATOR
OUTPUT
NOT
USED
PRIORITY
ON
PRIORITY
ON

8
Priority Zoning Circulator Controlling SR504/506 Switching Relay
SIX ZONE SWITCHING RELAY
WITH OPTIONAL PRIORITY
ZONE 6
ON
OFF
PRIORITY
120V RELAY
120 VOLT CIRCULATORS
ZC ZR
X X
END
SWITCH
POWER
INPUT
120 VAC INPUT
TO: "TT" ON BOILER
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
ZONE1 ZONE2 ZONE3 ZONE4 ZONE5 ZONE6
FUSE 1 AMP
24 VAC
POWER
SR 506
ZONE 2
POWER
ZONE 1
ZONE 3
ZONE 4
ZONE 5
ZONE 6
ON
OFF
PRIORITY
POWER IN
120 VAC INPUT
THERMOSTAT BOILER PRIORITY
PRIORITY ZONING CIRCULATOR
PR-IN PR-OUT LIVE NEUT
1234
THERMOSTATS
BOILER
H
N
A
AQUASTAT ON
DHW HEATER
MASTER
SLAVE
PRIORITY
ON
REMOVE
JUMPER
PRIORITY
OFF
T