ECR International 75F User guide

Manufactured by:
ECR International Inc.
2201 Dwyer Avenue, Utica, NY 13501
Tel. [phone]
www.ecrinternational.com
PN 240012875 REV. D [03/15/2022]
APPLICATION GUIDE
FOR USE WITH
FLOOR STANDING
HEATING ONLY - 75F, 100F, 125F, 165F
&
COMBI - 115F, 150F, 205F
This manual has been prepared for use with the appropriate Installation, Operation and
Maintenance Manual.

2PN 240012875 REV. D [03/15/2022]
TABLE OF CONTENTS
Important Safety Information ........................................................................................ 3
Labor Saving Piping Manifolds / Near Boiler Piping Connections.................................... 4
General Information - Hydronic Piping ........................................................................... 6
General Information - wiring.......................................................................................... 8
Piping and Wiring Diagrams
Piping Legend................................................................................................................. 9
75F, 100F, 125F w/Zone circulators & DHW Tank- piping diagram .....................................10
75F, 100F, 125F W/Indirect Zone circulators, DHW tank w/Sensor - Wiring Dia. ..................11
75F, 100F, 125F w/Indirect Zone circulators & DHW Tank w/t-stat - WIRING Dia.................12
75F, 100F, 125F with Zone Valves & DHW Tank - PIPING Diagram ....................................13
75F, 100F, 125F with Zone Valves, DHW Tank W/Sensor - Wiring Dia. ...............................14
75F, 100F, 125F zone valves, DHW tank w/t-stat - wiring Diagram ....................................15
165F with Zone Circulators - PIPING Diagram .................................................................16
165F indirect Zone Circulators, DHW Tank w/ T-Stat - Wiring Dia. .....................................17
165F with zone Valves - PIPING Diagram .......................................................................18
165F with Indirect Zone Valves, DHW Tank, Tank T-Stat - Wiring Dia. ...............................19
115F, 150F & 205F with zone circulators - PIPING Diagram ..............................................20
115F, 150F & 205F with zone Circulators - Wiring Diagram...............................................21
115F, 150F & 205F with Zone Valves - PIPING Diagram ...................................................22
115F, 150F & 205F with Zone Valves - Wiring Diagram ...................................................23
 ......................................................................24
 .......................................................................26
Optional Equipment...................................................................................................... 29
.................................................................29
.............................................................29
Accessories .................................................................................................................. 30
...................................................................................30
Indirect Storage Tank Sensor ......................................................................................31
Wiring Diagrams
Single Zone Circulator Wiring Using ARGO AR822-II ........................................................32
75 & 100 - Heat Only Wiring Diagram ............................................................................33
125 - Heat Only Wiring Diagram ...................................................................................34
165 - Heat Only Wiring Diagram ...................................................................................35
115 - combi Wiring Diagram........................................................................................36
150 - combi Wiring Diagram........................................................................................37
205 - combi Wiring Diagram........................................................................................38
Altitude Eects On Boiler Performance......................................................................... 39
Application Table - Indirect Hot Water Tank Sizing ...................................................... 41
LWCO Wiring Diagram .................................................................................................. 42
Piping Diagram - LWCO Location .................................................................................. 43
Low Water Cuto - Detail ............................................................................................. 44
Error Code Table........................................................................................................... 45
Troubleshooting Chart.................................................................................................. 46
Fault Solution Sections................................................................................................. 48
PARAMETER CHANGE HISTORY..................................................................................... 52

3PN 240012875 REV. D [03/15/2022]
IMPORTANT SAFETY INFORMATION
CAUTION
Indicates a hazardous situation which, if not
avoided, could result in minor or moderate injury.
!!
WARNING
Indicates a hazardous situation which, if not
avoided, could result in death or serious injury.
!
DANGER
Indicates a hazardous situation which, if not
avoided, WILL result in death or serious injury.
!
This is the safety alert symbol. Symbol alerts you toThis is the safety alert symbol. Symbol alerts you to
potential personal injury hazards. Obey all safety messagespotential personal injury hazards. Obey all safety messages
following this symbol to avoid possible injury or death.following this symbol to avoid possible injury or death.
1.1. Become familiar with symbols identifyingBecome familiar with symbols identifying
potential hazards.potential hazards.
2. General
Boiler installation shall be completed by qualified agency.
See Installation, Operation & Maintenance Manual for
additional information.
WARNING
Fire, explosion, asphyxiation and electrical shock
hazard. Improper installation could result in death
or serious injury. Read this manual and understand
all requirements before beginning installation.
!
3. Installation shall conform to requirements of
authority having jurisdiction or in absence of such
requirements:
• United States
• National Fuel Gas Code, ANSI Z223.1/NFPA 54 .
• National Electrical Code, NFPA 70.
• Canada
• Natural Gas and Propane Installation Code, CAN/
CSA B149.1.
• Canadian Electrical Code, Part I, Safety Standard for
Electrical Installations, CSA C22.1
4. Where required by authority having jurisdiction,
installation shall conform to Standard for Controls
and Safety Devices for Automatically Fired Boilers,
ANSI/ASME CSD-1.
Additional manual reset low water cutoff and/or high limit
may be required.
5. Requirements for Commonwealth of
Massachusetts:
Boiler installation must conform to Commonwealth of
Massachusetts code 248 CMR which includes but is not
limited to:
• Installation by licensed plumber or gas fitter.
WARNING
Fire, Explosion, Asphyxiation, Electrical shock
hazard! Flooding will result in damages such as
electrical problems, corrosion, inoperative parts,
mold and other unforeseen issues which can
occur over time. Any equipment determined by
a professional as damaged by a flood, defined
as excess of water or other liquid, shall be
replaced. Failure to follow these directions will
result in a Hazardous Situation.
!

4PN 240012875 REV. D [03/15/2022]
LABOR SAVING PIPING MANIFOLDS / NEAR BOILER PIPING CONNECTIONS
LEGEND 75/100/125 165
A Heating Supply Connection 
sweat
[31.75 mm]
 sweat
[38.1 mm]
B Condensate Drain Connection 1/2" NPT
C Gas Shutoff Connection 3/4" NPT
D
Optional Indirect DHW Connection
(may exit right or left)
3/4" sweat
[22.2 mm]
NA
E Heating Return Connection 
sweat
[31.8 mm]
 sweat
[38.1 mm]
75F, 100F & 125F HEATING ONLY
WITH OPTIONAL INDIRECT DHW CONNECTION
75F, 100F & 125F HEATING ONLY
WITHOUT OPTIONAL INDIRECT DHW
CONNECTION
165F HEATING ONLY
E
E
E
A
A
A
DC
C
C
B
B
B

5PN 240012875 REV. D [03/15/2022]
LABOR SAVING PIPING MANIFOLDS / NEAR BOILER PIPING CONNECTIONS
115F & 150F/205F COMBI (150 shown)
LEGEND 115/150 205
A Heating Supply Connection 
sweat
[31.75 mm]
 sweat
[38.1 mm]
B Domestic Hot Water Outlet 1/2"
sweat
[12.7 mm]
3/4" sweat
[22.2 mm]
C Condensate Drain Connection 1/2" NPT
D Gas Shutoff Connection 3/4" NPT
E Domestic Cold Water Inlet
 sweat
[12.7 mm]
3/4" sweat
[22.2 mm]
F Heating Return Connection 
sweat
[31.8 mm]
 sweat
[38.1 mm]
E FA DCB

6PN 240012875 REV. D [03/15/2022]
GENERAL INFORMATION - HYDRONIC PIPING
WARNING
Burn and scald hazard! Manufacturer requires
installation of field supplied anti-scald valve.
Failure to follow these instructions could result in
death or serious injury.
!
FOR YOUR SAFETY READ BEFORE OPERATING
DANGER
!
Hot Water Can Scald!
Water heated to temperature for clothes
washing, dish washing and other sanitizing needs
can scald and cause permanent injury.
Children, elderly, and infirmed or physically
handicapped persons are more likely to be
permanently injured by hot water. Never leave
them unattended in bathtub or shower. Never
allow small children to use a hot water tap or
draw their own bath.
If anyone using hot water in the building fits the
above description, or if state laws or local codes
require certain water temperatures at hot water
taps, you must take special precautions:
• Use lowest possible temperature setting.
• Install some type of tempering device, such
as an automatic mixing valve, at hot water
tap or water heater. Automatic mixing valve
must be selected and installed according
to manufacturer's recommendations and
instructions.
• Water passing out of drain valves may be
extremely hot. To avoid injury:
 Make sure all connections are tight.
 Direct water flow away from any person.
General Information:
Piping installation, materials, and joining methods shall
conform to requirements of authority having jurisdiction or
in absence of such requirements:
• USA - National Fuel Gas Code, ANSI Z223.1/NFPA 54
• Canada - Natural Gas and Propane Installation Code,
CAN/CSA B149.1
Manufacturer Requirements/Recommendations:
• Manufacturer requires all domestic hot water
(DHW) installations use an anti-scald valve.
Local codes may require additional equipment
(expansion tank, relief valves, etc.) Select and
size equipment to suit installation and meet code
requirements.
• Use a water filter on potable incoming water supply
line.
• Manufacturer recommends use of a magnetic dirt
separator in the hydronic system where there are
cast iron or steel components, or where the previous
boiler was a cast iron heat exchanger. The abrasive,
extremely fine sediment is difficult to remove and can
deposit onto heat exchanger surfaces and accumulate
in pump cavities causing reduced efficiency and
premature wear.
• If the piping manifold is not used the ASME
temperature and pressure relief valve and
temperature and pressure gauge shall be installed
to conform to requirements of the authority having
jurisdiction. Refer to appropriate manufacturer
instructions for installation requirements.
• If the piping manifold is not used, a primary /
secondary piping arrangement is manufacturer
required, unless using Buffer Tank. A maximum of
12 in of separation between the supply and return
pipe (closely spaced tees) of the boiler shall be
maintained. Limit combined supply and return pipe
lengths to maximum linear lengths of 20 ft (6.1
m) between boiler and closely spaced tees, when
minimum ¾ in NPT pipe size is used. Linear length
may be increased if supply and return pipe size is
increased to limit pressure drop.
• Manufacturer recommends installing a shutoff
and purge valve to use during commissioning to
ensure the boiler does not shut down due to over
temperature. Do not install shutoff between boiler
and LWCO or pressure relief valve.

7PN 240012875 REV. D [03/15/2022]
Note
Provided Wiring and Piping illustrations
are meant to show system concepts only.
Installer is responsible for all equipment
required by authority having jurisdiction.
Note Arrange piping to prevent water dripping
onto boiler.
All piping diagrams are shown with optional DHW Indirect
Tank where applicable.
GENERAL INFORMATION - HYDRONIC PIPING
Water
Temperature
Seng
1st Degree Burn
Exposure Time For
An Adult
2nd and 3rd Degree Burn
Exposure Time For An
Adult
120° F 1 minute 5 minutes
130° F 5 seconds 30 seconds
140° F 2 seconds 5 seconds
150° F 1 second 1.5 seconds
160° F Instantaneous 0.5 seconds
Note: Warning for Infants, Children, and Elderly:
Great care must be taken when exposing the
aforementioned groups to warm or hot water as they
can be badly burned in exposure times less than half
of the time for an adult.
Use of Buffer Tank:
☐If using internal boiler pump, manifold shall be cut for
use as shown on page 24. Increase pipe size to match

☐Locate tank as close to boiler as possible.
The Labor Saver Piping Manifold, which is supplied with
each boiler, is shown with most of the following piping
diagrams.
Use of Indirect Water Heater (DHW) Heating
Only Boiler:
Note Sensors supplied with this boiler are
proprietary to the manufacturer. Use of
alternate sensors WILL diminish boiler
performance.
☐Use DHW sensor kit 550003189 to interface with
boiler. Wire to M2 terminals #3 and #4. Exception: not
applicable for the 165 model, use aquastat for indirect
tank control.
☐For heating only boilers with DHW outlet connection,
see page 4, indirect water heater shall be piped
utilizing the internal boiler pump. See pages 10 and 13.
☐Locate tank as close to boiler as possible.
☐See Indirect Tank Performance chart, page 40 of this
manual.
☐
applicable wire diagram in this manual or Boiler Control
Section 9 of Installation, Operation & Maintenance
Manual supplied with the boiler.

8PN 240012875 REV. D [03/15/2022]
GENERAL INFORMATION - WIRING
Electrical Wiring Information:
All field wiring shall conform to the authority having
jurisdiction or, in the absence of such requirements to:
• USA: National Electrical Code, ANSI/NFPA 70,
• Canada: Canadian Electrical Code, Part I, CSA
C22.1: Safety Standard for Electrical Installations.
Wiring diagrams shown in this manual utilize ARGO™
Controls, the optional use of an Indirect Domestic Hot
Water Tank, and optional use of a H2O Buffer Tank.
Reference the zone control manufacturer instruction
manual for control operation and priority setting of DHW
zones.
Note DO NOT use 120 V thermostat
terminals (M1- #1 and #2).
Provided Wiring and Piping
illustrations are meant to show
system concepts only. Installer
is responsible for all equipment
required by authority having
jurisdiction.
Note
SUPPLY Cord
120V/60HZ
BOILER CONTROL
10k Ω DHW Indirect
Tank Sensor (125
Unit Only)
or
DHW Indirect Tank
Aquastat (Heating
Only Boilers)
1K Ω
Outdoor
Reset
Sensor
Zone Control
End-Switch
Open Therm
S
0-10 V Connection
*
* Ground Sensors using terminal 4
G
Do Not
Use

9PN 240012875 REV. D [03/15/2022]
PIPING LEGEND
ZONE VALVE
BALL VALVE
AIR SEPERATOR
CIRCULATOR
DRAIN
COMBINATION FILL

BYPASS VALVE
DIVERTER VALVE
T&P OR RELIEF VALVE
THERMOSTATIC MIXING VALVE


10K Ω 
TEMPERATURE & PRESSURE GAUGE

FLAT PLATE HEAT EXCHANGER
(COMBI ONLY)
STRAINER
PIPING LEGEND
PURGE VALVE
MAGNETIC DIRT SEPARATOR

10 PN 240012875 REV. D [03/15/2022]
75F, 100F, 125F W/ZONE CIRCULATORS & DHW TANK- PIPING DIAGRAM
75F, 100F & 125F W/ ZONE CIRCULATORS & DHW TANK- PIPING DIAGRAM
1
Shut off & Purge Valve
MAGNETIC DIRT
SEPARATOR
1
Locate shut off valve after any field installed LWCO.

11 PN 240012875 REV. D [03/15/2022]
75F, 100F, 125F W/INDIRECT ZONE CIRCULATORS, DHW TANK W/SENSOR - WIRING DIA.
If adding an indirect tank with sensor to a Heating Only Boiler, change P03 from 08 to 05. See Section 9, Parameter Settings in Boiler Installation, Operation & Maintenance Manual for details.
Reference zone control manufacturer instructions for details on setting priority if necessary.
75F, 100F & 125F WITH INDIRECT ZONE CIRCULATORS & DHW TANK W/SENSOR, ARGO UZ3
ZONE CONTROL
UZ3

12 PN 240012875 REV. D [03/15/2022]
75F, 100F, 125F W/INDIRECT ZONE CIRCULATORS & DHW TANK W/T-STAT - WIRING DIA.
75F, 100F & 125F W/ INDIRECT ZONE CIRCULATORS & DHW TANK W/T-STAT, ARGO UZ3 ZONE
CONTROL WIRING DIAGRAM
Reference zone control manufacturer instructions for details on setting priority if necessary.
If adding an indirect tank with Thermostat to a Heating Only Boiler, change P03 from 08 to 04. See Section 9, Parameter Settings in Boiler Installation, Operation & Maintenance Manual for details.
ZONE 1
LINE
24V
Vac
L
C
R
115 Vac
NL 1
N
115
COM
Vac
ZRZC
NL
3
NL
2
115 Vac
N
L
1
LN
ZONE CIRCULATOR
XXXXX
32
1
X
NEC Class 2 Low Voltage
ZONE 3
ZONE 2
ZONE 1
W
R
NEC Class 2 Low Voltage
TTC
THERMOSTATS ZONE VALVES
ZONE 3ZONE 2
43214321432
1
NEC Class 2 Low Voltage (24Vac)
W
R
TTC
W
R
TTC
PRI PUMP ZC/ZR
DIGITAL LCD USER DISPLAY
Fuse
ZONE MODULE
TO EXPANSION
Transformer
PTC
12A 250V
115 Vac FIELD SUPPLIED
POWER PER NEC
AND LOCAL CODES
Z2 Z3
ZONE
T-STATS
12345678910
VAC
24
M2
M2 terminal strip
G
*
on boiler
Domestic Hot
Water Tank
UZ3

13 PN 240012875 REV. D [03/15/2022]
1
Shut off & Purge Valve
MAGNETIC DIRT
SEPARATOR
75F, 100F, 125F WITH ZONE VALVES & DHW TANK - PIPING DIAGRAM
75F, 100F & 125F WITH ZONE VALVES & DHW TANK
1
Locate shut off valve after any field installed LWCO.

14 PN 240012875 REV. D [03/15/2022]
75F, 100F, 125F WITH ZONE VALVES, DHW TANK W/SENSOR - WIRING DIA.
75F, 100F & 125F WITH ZONE VALVES, DHW TANK W/ SENSOR, ARGO UZ3 ZONE CONTROL
UZ3
If adding an indirect tank with sensor to a Heating Only Boiler, change P03 from 08 to 05. See Section 9, Parameter Settings in Boiler Installation, Operation & Maintenance Manual for details.
Reference zone control manufacturer instructions for details on setting priority if necessary.

15 PN 240012875 REV. D [03/15/2022]
75F, 100F, 125F ZONE VALVES, DHW TANK W/T-STAT - WIRING DIAGRAM
75F, 100F & 125F WITH ZONE VALVES,
DHW
TANK , & TANK T-STAT, ARGO UZ3 ZONE CONTROL
ZONE 1
LINE
24V
Vac
L
C
R
115 Vac
NL 1
N
115
COM
Vac
ZRZC
NL
3
NL
2
115 Vac
N
L
1
LN
ZONE CIRCULATORS
XXXXX
32
1
X
NEC Class 2 Low Voltage
ZONE 3ZONE 2
ZONE 1
W
R
NEC Class 2 Low Voltage
TTC
THERMOSTATS ZONE VALVES
ZONE 3ZONE 2
43214321432
1
NEC Class 2 Low Voltage (24Vac)
W
R
TTC
W
R
TTC
PRI PUMP ZC/ZR
DIGITAL LCD USER DISPLAY
Fuse
ZONE MODULE
TO EXPANSION
Transformer
PTC
12A 250V
Domestic Hot
115 Vac FIELD SUPPLIED
POWER PER NEC
AND LOCAL CODES
Water Tank
PRIMARY
PUMP
ZONE
THERMOSTATS
ZONE VALVES
VANNES DE ZONE
4 Wire Valve 3 Wire Valve
12 34 12 3
w/T-Stat
12345678910
VAC
24
M2
G
*
UZ3
Reference zone control manufacturer instructions for details on setting priority if necessary.
If adding an indirect tank with Thermostat to a Heating Only Boiler, change P03 from 08 to 04. See Section 9, Parameter Settings in Boiler Installation, Operation & Maintenance Manual for details.

16 PN 240012875 REV. D [03/15/2022]
1
Shut off & Purge Valve
MAGNETIC DIRT
SEPARATOR
165F WITH ZONE CIRCULATORS - PIPING DIAGRAM
1Locate shut off valve after
any field installed LWCO.
165F WITH ZONE CIRCULATORS

17 PN 240012875 REV. D [03/15/2022]
165F INDIRECT ZONE CIRCULATORS, DHW TANK W/ T-STAT - WIRING DIA.
165F ZONE CIRCULATORS,
DHW
TANK, & TANK T-STAT, ARGO UZ3 ZONE CONTROL
ZONE 1
LINE
24V
Vac
L
C
R
115 Vac
NL 1
N
115
COM
Vac
ZRZC
NL
3
NL
2
115 Vac
N
L
1
LN
ZONE CIRCULATOR
XXXXX
32
1
X
NEC Class 2 Low Voltage
ZONE 3
ZONE 2
ZONE 1
WR
NEC Class 2 Low Voltage
TTC
THERMOSTATS ZONE VALVES
ZONE 3ZONE 2
43214321432
1
NEC Class 2 Low Voltage (24Vac)
WR
TTC
WR
TTC
PRI PUMP ZC/ZR
DIGITAL LCD USER DISPLAY
Fuse
ZONE MODULE
TO EXPANSION
Transformer
PTC
12A 250V
Domestic Hot
115 Vac FIELD SUPPLIED
POWER PER NEC
AND LOCAL CODES
DHW Z2 Z3
Water Tank
ZONE
THERMOSTATS
w/T-Stat
12345678910
VAC
24
M2
G
*
UZ3
Reference zone control manufacturer instructions for details on setting priority if necessary.
If adding an indirect tank with Thermostat to a Heating Only Boiler, change P03 from 08 to 04. See Section 9, Parameter Settings in Boiler Installation, Operation & Maintenance Manual for details.

18 PN 240012875 REV. D [03/15/2022]
1
Shut off & Purge Valve
MAGNETIC DIRT
SEPARATOR
165F WITH ZONE VALVES
165F WITH ZONE VALVES - PIPING DIAGRAM
1Locate shut off valve after
any field installed LWCO.

19 PN 240012875 REV. D [03/15/2022]
165F WITH INDIRECT ZONE VALVES, DHW TANK, TANK T-STAT - WIRING DIA.
165F INDIRECT ZONE VALVES,
DHW
TANK, & TANK T-STAT, ARGO UZ3 ZONE CONTROL
If adding an indirect tank with Thermostat to a Heating Only Boiler, change P03 from 08 to 04. See Section 9, Parameter Settings in Boiler Installation, Operation & Maintenance Manual for details.
Reference zone control manufacturer instructions for details on setting priority if necessary.
ZONE 1
LINE
24V
Vac
L
C
R
115 Vac
NL 1
N
115
COM
Vac
ZRZC
NL
3
NL
2
115 Vac
N
L
1
LN
ZONE CIRCULATOR
XXXXX
32
1
X
NEC Class 2 Low Voltage
ZONE 3ZONE 2
ZONE 1
W
R
NEC Class 2 Low Voltage
TTC
THERMOSTATS ZONE VALVES
ZONE 3ZONE 2
43214321432
1
NEC Class 2 Low Voltage (24Vac)
W
R
TTC
W
R
TTC
PRI PUMP ZC/ZR
DIGITAL LCD USER DISPLAY
Fuse
ZONE MODULE
TO EXPANSION
Transformer
PTC
12A 250V
Domestic Hot
115 Vac FIELD SUPPLIED
POWER PER NEC
AND LOCAL CODES
Water Tank
PRIMARY
PUMP
ZONE
THERMOSTATS
ZONE VALVES
VANNES DE ZONE
4 Wire Valve 3 Wire Valve
12 34 12 34 12 3
w/T-Stat
12345678910
VAC
24
M2
G
*
UZ3

20 PN 240012875 REV. D [03/15/2022]
115F, 150F & 205F WITH ZONE CIRCULATORS
115F, 150F & 205F WITH ZONE CIRCULATORS - PIPING DIAGRAM
MAGNETIC DIRT
SEPARATOR
1
Shut off & Purge Valve
1Locate shut off valve after
any field installed LWCO.