ECR UCS-380 Instruction manual

P/N 240011662 Rev. E [09/15/2017]
CONDENSING GAS FIRED
FLOOR OR WALL MOUNTED
BOILER
INSTALLATION, OPERATION &
MAINTENANCE MANUAL
Model
UCS-380
Manufactured by:
ECR International Inc.
2201 Dwyer Avenue, Utica, NY 13501
Tel. [phone]
www.ecrinternational.com

2
Fully Assembled Boiler Safety Relief Valve Temperature Pressure
Gauge Drain Valve
Used for measuring outside
temperature Includes essential documents
Gas Shutoff Valve Outdoor Sensor Document Package Manifold (See page 13
5.9 for install instructions)
VERIFY CONTENTS RECEIVED
P/N 240011662, Rev. E [09/15/2017]

3
TABLE OF CONTENTS
1 - Important Information.................................... 5
2 - Introduction.................................................... 6
3 - Component Listing .......................................... 7
4 - Locating Boiler ................................................ 8
5 - Hydronic Piping............................................. 10
5.2 Special Conditions.......................................10
5.3 Safety Relief Valve and Air Vent ....................11
5.4 Low Water Cutoff ......................................11
5.5 Trim Piping.................................................12
5.6 System Piping ............................................12
5.7 Heating System And Refrigeration .............. 13
5.8 Available Pump Head for Central Heating .... 13
6 - Combustion Air And Vent Piping.................... 20
6.2 Removal of Existing Boiler From Common Vent
System ...........................................................20
6.3 Approved Venting Materials ..........................21
6.4 Concentric Venting Instructions ....................22
6.5 Two Pipe Polypropylene System ....................25
6.6 Venting Congurations.................................27
6.7 Side Venting Terminal Requirements of :..... 31
6.8 Condensate Piping ......................................34
6.9 Multiple Boiler Venting - General ............... 35
6.10 Multiple Boiler Venting - Mounting ............ 35
6.11 Multiple Boiler Venting - Layout................ 37
6.12 Multiple Boiler Venting - Parameter Setting 39
7 - Gas Supply Piping ......................................... 40
7.2 LP Conversion ............................................40
8 - Electrical Connections ................................... 42
8.2 Electric Knockouts.......................................42
8.3 Electrical Connections..................................42
8.4 Access To Connection Block..........................42
8.5 Main Supply Connection...............................42
8.6 Shutdown Input..........................................43
8.7 Release Input.............................................43
8.8 Optional Electrical Connections: ...................43
8.9 Outdoor Temperature Sensor........................46
8.10 Central Heating Thermostat........................46
8.11 DHW Indirect Water Heater ........................47
8.12 Frost Protection ........................................47
9 - Start Up Procedure........................................ 50
9.1 Fill Condensate Trap with Water ....................50
9.2 Commission Setup (Water)...........................50
9.3 Commission Setup (Gas) .............................51
9.4 Commission Setup (Electric).........................51
9.5 Control Panel............................................. 52
9.6 Deaeration Function.....................................53
9.7 Commissioning ...........................................54
9.8 Before Gas Conversion ................................54
9.9 Gas Conversion (Propane)............................54
9.10 Combustion Setup (High-Fire).....................55
9.11 Combustion Setup (Low-Fire) .....................55
9.12 Operational Check.....................................55
9.13 User Level Parameters ...............................56
9.14 Installer Level Parameters ..........................56
9.15 Parameters Settings ..................................57
9.16 Reading Measured Values..........................60
9.17 Status And Sub-Status...............................61
9.18 Return To The Factory Settings ...................62
10 - Operating Instructions ................................ 64
10.1 Sequence Of Operation ..............................64
10.2 Operating Instructions ...............................64
10.3 To Turn Off Gas To Appliance ......................64
11 - General Maintenance And Cleaning ............. 65
12 - Ratings And Capacities................................ 69
13 - Trouble Shooting......................................... 70
13.1 Troubleshooting - Error Code Table ..............70
13.2 Shutdowns And Lock-Outs..........................72
13.3 Error History ............................................75
13.4 Error History Readout ...............................75
13.5 Optional Sensors.......................................76
Troubleshooting Chart 1 ....................................77
Troubleshooting Chart 2 ....................................78
Troubleshooting Chart 3 ....................................79
Troubleshooting Chart 4 ....................................80
Troubleshooting Chart 5 ....................................81
Troubleshooting Chart 6 ....................................82
Troubleshooting Charts 7 & 8 .............................83
Troubleshooting Chart 9 ....................................84
Troubleshooting Chart 10 ..................................85
Troubleshooting Chart 11 ..................................86
Temperature - Resistance Chart .........................87
14 - Glossary................................................. 88
P/N 240011662, Rev. E [09/15/2017]

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Table 1: Physical Data
Model 380
Width (A) 23-⅝" (600mm)
Height (B) 50" (1.27m)
Depth (C) 25-½" (648mm)
Bottom Cabinet (D)
Access from Back or Sides of Jacket 11-¾" (298.5mm)
Water
Connections
Size 1-½ (38.1mm)
Location (G) 3-¾" (95.3mm)
Location (H)
Return 11-¾" (298.5mm)
Location (I)
Supply 7-¾" (196.9mm)
Gas
Connection
Location (L) 7-¾" (196.9mm)
Size 1" NPT
Condensate Drain
Connection (J)
Location (J) 8-¾" (196.9mm)
Size 3/4" NPT
Weight
Shipping 255 LBS (115.7)
Unit 225 LBS (102.1kg)
Vent Connector - Concentric 110/160 mm
Electrical Cord Length 5 ft. (1.5m)
PHYSICAL DATA
Dimensions
Vent Connector
Combustion Air
A
B
Front View
Top View
Bottom View
Dimensions
H
G
C
J
Condensate Drain
Connection
Return Water
Gas Connection
Bottom View
Connection
Identication
Supply Water
50 psi safety relief valve (3.44 bar)
Pressure relief valve connection 3/4"
(22.2m)
Wire Knockouts
D
Front of Boiler
Front of Boiler
L
Front of Boiler
I
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1 - IMPORTANT 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
to potential personal injury hazards. Obey all safety
messages following this symbol to avoid possible
injury or death.
Become familiar with symbols identifying potential hazards.
Boiler installation shall be completed by qualied agency. See
glossary 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.
!
1. Safety Information
CAUTION
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any
phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow gas supplier’s
instructions.
• If you cannot reach your gas supplier, call the re
department.
!
WARNING
Do not tamper with or use this boiler for any
purpose other than its intended use. Failure
to follow these instructions could result in
death or serious injury. Use only manufacturer
recommended parts and accessories.
!
CAUTION
Laceration, burn hazard. Metal edges and parts may
have sharp edges and/or may be hot. Use appropriate
personal protection equipment to include safety
glasses and gloves when installing or servicing this
boiler. Failure to follow these instructions could result
in minor or moderate injury.
!
Note Used to address practices not related to
personal injury.
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Information and specications outlined in this manual in effect at the
time of printing of this manual. reserves the right to
discontinue, change specications or system design at any time without
notice and without incurring any obligation, whatsoever.
2 - INTRODUCTION
2.5 Designated Use
• Hot water heating boiler.
• Indoor installation.
• Closet or alcove installation.
• Direct vent boiler or single vent pipe.
• For use with natural gas or liqueed petroleum gases
(LP/propane).
2.6 The unit MUST NOT:
• Directly heat potable water. Indirect heating is acceptable.
• Heat water with non-hydronic heating system chemicals
present (example, swimming pool water).
• Exceed 50 psig (3.44 bar) maximum allowable working
pressure, or drop below minimum system pressure 7.25
psig (.50 bar)
• Exceed 176°F (80°C) system design temperature.
2.7 Operational Features
• Modulating: 15-100% Input Rate.
• Integral Dual Limit.
• Integral Low Water Pressure Cutoff.
• Outdoor Temperature Reset.
• Heat exchanger over heat protection.
• Recommended system pressure (cold) 21.7 psig (1.5
bar)
2.8 CSD-1 Compliance
Consult authority having jurisdiction pripr to installation.
Field source:
• Manual reset low water cutoff. see Section 5-4.
• Manual Reset External Hight Temperature Limit.
Connect to (?). See wire diagram.
2 - Introduction
2.1 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
2.2 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 may be required.
2.3 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 tter.
2.4 Manufacturer recommends use of Carbon
Monoxide monitor may be requirement of local
jurisdiction.
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3 - COMPONENT LISTING
1Condensate trap
2Gas Valve
3Fan
4Air/gas mixer
5Heat exchanger
6Burner sight glass
8Flue sensor
9Coaxial ue connector
10 Exhaust test port
11 Intake test port
12 Exchanger ange high limit (#4 on
wire diagram)
13 Ignition/Flame detection electrode
14 Spark generator
15 Automatic air vent
16 Auxiliary control board box
17 Air/gas venturi
18 Pump
19 Boiler drain
21 Low water pressure switch
22 Thermal fuse (#6 on wire diagram)
ACondensate trap drain
BGas inlet connection
CHeating supply connection
DHeating return connection
P/N 240011662, Rev. E [09/15/2017]
UCS-380

8
4 - LOCATING BOILER
4.1 Boiler Location Considerations
• Ambient room temperature always above 32°F (0°C) to
prevent freezing of liquid condensate.
• Approved for installation in closets or alcove provided it
is correctly designed for that purpose.
• Not approved for outdoor installation.
• Protect gas ignition system components from water
(dripping, spraying, rain, etc.) during operation and
service (circulator replacement, condensate trap, control
replacement, etc.).
• Access to outdoors to meet minimum and maximum
pipe lengths for combustion air and vent piping. See
section 6.
• Disposal of condensate. See section 6.
• Drainage of water (or water - antifreeze solution) during
boiler service or from safety relief valve discharge. See
section 5.
• Access to system water piping, gas supply, and electrical
service. See sections 5, 7 and 8.
• Clearances to combustible materials and service
clearances. See Table 2 and gures 4-1a - 4-2c.
• Boiler shall be installed on at surface capable of
supporting the weight of the boiler.
• Do not install on carpet.
• Boiler may be installed in any room or internal space,
special attention shall be given to the requirements
of the current electrical provisions with respect to the
installation of the boiler in a room or internal space
containing a bath or shower. Where a room- sealed
boiler is installed in a room containing a bath or shower,
it must not be possible for a person using the bath or
shower to touch any electrical switch or boiler control
utilizing line voltage electricity.
• Multiple Boilers can be placed side by side, or back to
back.
TABLE 2: BOILER CLEARANCES
Dimension Combustible
Materials (1) Service(1)(2)
Model
Top (A) 0" (0 cm) 15-3/4
(400 mm)
Left Side (B)
1 - 3 / 4 "
(45 mm)
1 - 3 / 4 "
(45 mm)
Right Side (C)
1 - 3 / 4 "
(45 mm)
1 - 3 / 4 "
(45 mm)
Front (D) 2" (4.5 cm) 2 3 - 5 / 8 "
(600 mm)
Back (E)
0" (0 cm) 0" (0 cm)
Bottom (F)
0" (0 cm) 0" (0 cm)
Combustion Air/Vent
piping
0" (0 cm) 6" (16 cm)
(1) Required distances measured from boiler jacket.
(2) Service, proper operation clearance recommendation.
* Allowance for piping at the bottom of boiler not included.
WARNING
Fire Hazard! Do not install on carpeting. Failure to
follow these instructions could result in death or
serious injury.
!
Note Use two (2) wrenches when tightening and tting
to pipe boiler's threaded ttings. Boiler's internal
piping can be damaged if subjected to excessive
torque.
P/N 240011662, Rev. E [09/15/2017]
UCS-380

9
4 - LOCATING BOILER
A
E
ED
A
C
B
A
FLOOR
FLOOR
Boiler Front
View
Boiler Left Side View
FIGURE 4-1a Clearance to Combustible Materials FIGURE 4-2a Service Clearances - Boiler Front
FIGURE 4-1b Clearance to Combustible Materials
FIGURE 4-2b Service Clearances - Boiler Left side
Boiler
Front View
FIGURE 4-2c Service Clearances - Closet Installation
CLOSET INSTALLATION
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5 - HYDRONIC PIPING
5.1 General
• Primary/Secondary piping required.
• Install piping in accordance with authority having
jurisdiction.
• Support system piping and safety relief valve discharge
piping. Boiler's internal piping and wall mount bracket
can be damaged if subjected to excessive weight.
• Size central heating pump (and domestic hot water
pump, if used) for system requirements only. Internal
heat exchanger pump compensates for pressure drop
through boiler internal piping and heat exchanger.
• Thoroughly clean and ush system before connecting to
boiler.
• If oil is present in system water, use approved detergent
to wash system.
• It is necessary to semi-annually check the water quality
of central heating systems.
• Flush system to remove any solid objects such as metal
chips, bers, or Teon tape, etc.
• Use purge valve to ush zoned systems, each zone
separately. If purge valves and isolation valves are not
installed, install them to properly clean the system.
• When purging installations that include standing iron
radiators and systems with manual vents at high points,
start with nearest manual air vent. Open the vent until
water ows out, then close vent. Repeat this procedure,
working toward furthest air vent.
• Install a basket strainer if large amounts of sediment is
present. Keep basket clear of sediment build up.
• Flush system until water runs clean and piping is free of
sediment.
• Manufacturer recommends a water treatment product
be used for sediment removal.
5.2 Special Conditions
Note
• System piping exposed to freezing conditions: Use
inhibited propylene glycol solutions certied by uid
manufacturer for use with closed water heating system.
Do not use automotive or ethylene glycol.
• Boiler installed above radiation level (or as required
by authority having jurisdiction). Integral low water
pressure switch is provided in boiler.
• Boiler used in connection with refrigeration system.
Install piping in parallel with boiler, with appropriate
valves to prevent chilled medium from entering boiler.
• System piping connected to heating coils located in air
handling unit exposed to refrigerated air circulation.
Install ow control valves or other automatic means to
prevent gravity circulation of boiler water during cooling
cycle.
Note Boiler rated at 80 psig (551.6 kPa) maximum
allowable working pressure. Boiler provided with
50 psig (345 kPa) safety relief valve. Field source
safety relief valves for system pressures greater
than 50 psig (345 kPa).
WARNING
• Poison hazard. Ethylene glycol is toxic. Do not
use ethylene glycol.
• Never use automotive or standard glycol
antifreeze, even ethylene glycol made for
hydronic systems.
• Ethylene glycol can attack gaskets and seals used
in hydronic systems.
• Do not use petroleum based cleaning or sealing
compounds boiler system.
• Do not ll boiler or boiler system with softened
water.
• Use only inhibited propylene glycol solutions
certied by uid manufacturer as acceptable for
use with closed water heating system.
• Thoroughly clean and ush any system that used
glycol before installing new Boiler.
• Provide user with Material Safety Data Sheet
(MSDS) on uid used.
!
Do not expose boiler and condensate piping to
freezing temperatures.
Note
When installing safety relief valve it must be
installed in a vertical position with spindle at top.
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WARNING
Burn and scald hazard. Safety relief valve could
discharge steam or hot water during operation.
Install discharge piping per these instructions.
!
FIGURE 5-1 Safety Relief Valve Discharge Piping
5 - HYDRONIC PIPING
5.3 Safety Relief Valve and Air Vent
• Install safety relief valve using eld supplied pipe
ttings. See gure 5-1
• Install safety relief valve with spindle in vertical position.
• Do not install shutoff valve between boiler and safety
relief valve.
• Install discharge piping from safety relief valve.
• Use ¾" or larger pipe.
• Use pipe suitable for temperatures of 375°F (191°C) or
greater.
• Individual boiler discharge piping shall be independent
of other discharge piping.
• Size and arrange discharge piping to avoid reducing
safety relief valve relieving capacity below minimum
relief valve capacity stated on rating plate.
• Run pipe as short and straight as possible to location
protecting user from scalding and properly drain piping.
• Install union, if used, close to safety relief valve outlet.
• Install elbow(s), if used, close to safety relief valve
outlet and downstream of union (if used).
• Terminate pipe with plain end (not threaded).
Check Local Codes For
Maximum Distance To
Floor
5.4 Low Water Cutoff
• Boiler is equipped with Low Water Pressure Switch.
• Low Water Cutoff (LWCO) probe location. See gure 5-2
for minimum probe height. Do not install shutoff valve
between boiler and LWCO probe..
• If using separate stand pipe, install air vent using tee to
avoid nuisance shutdowns.
• Arrange piping to prevent water dripping onto boiler.
• Connect probe signal wires to shutdown terminal (BL) on
control board.
WARNING
Fire, explosion hazard. Mount boiler vertically or
slightly tilted backward to insure proper function of
low water cutoff. Failure to follow these instructions
could result in death or serious injury.
!
Safety Relief Valve
FIGURE 5-2 System Piping - LWCO Probe Location
Viewed from Back of Boiler
System
Supply
MINIMUM
ACCEPTABLE
HEIGHT FOR
LWCO PROBE
Check Local Codes
For Maximum
Distance To Floor
12” (305mm)
Maximum
Separation
System
Return
System
Supply
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WARNING
Burn and scald hazard. Primary/Secondary piping
with closely spaced supply and return lines is
mandatory for ASME Code Compliance. Failure to
follow these instructions could result in death or
serious injury.
!
Check Local Codes
For Maximum
Distance To Floor
5.5 Trim Piping
• Temperature - Pressure Gauge. Install temperature
pressure gauge using eld supplied piping. See gure 5-3.
Install as close to boiler supply tting as practical and
visible.
• Boiler has integral drain valve located inside jacket directly
underneath pump. Install provided external drain valve.
5.6 System Piping
• See Table 4 for basic system piping congurations.
• Systems with automatic ll valves require back ow
prevention device.
• Single boiler system. See gures 5-4, 5-5 for general
guidance. Additional considerations:
• Boiler control is designed for single central heating
pump. Installer responsible for integration of
multiple central heating pumps.
• Boiler control allows domestic hot water
prioritization. Function could be lost if central heating
pump not directly connected to control system.
• Multiple boiler system. See gures 5-6, 5-7 for general
guidance. Additional considerations:
• Control system requires equivalent water
temperatures entering each boiler to properly sequence
and adjust system supply temperature.
WARNING
Burn and scald hazard. Verify all plastic caps are
removed from boiler connections. Failure to follow
these instructions could result in death or serious
injury.
!
• Thoroughly ush all hydronic piping.
• Secure all valves/ttings to boiler.
• Ensure washers supplied are utilized.
• Face valves and ttings to rear wall.
• Fit union bends to valves.
A. If soldering to boiler union bends, ensure bends are
not connected to the valves, otherwise internal seals
may be damaged.
B. Verify 3/4" [22.2 mm] isolating valve with lter is
tted to heating return connection.
C. Fit pressure relief valve connection vertically before
heating isolating valve.
• Connect system valve pipe work to the boiler.
FIGURE 5-3 Temperature Pressure Gauge and Safety
Relief Valve Installation - Viewed from Back of Boiler
5 - HYDRONIC PIPING
Safety
Relief
Valve
Temperature
Pressure
Gauge
LWCO
System
Return
System
Supply
MINIMUM
ACCEPTABLE
HEIGHT FOR
LWCO PROBE
12” (305mm)
Maximum
Separation
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WARNING
Burn and scald hazard. Safety relief valve could
discharge steam or hot water during operation.
Install discharge piping per these instructions.
!
• Route pressure relief valve discharge piping to the oor.
Follow local code with respect to necessary distance to the
oor. See Figure 5-3.
• Verify all valves are closed.
• Connect supplied condensate trap to a drain. Verify there is
continuous slope towards the drain, avoid level horizontal
sections of tubing.
5.7 Heating System And Refrigeration
Boiler when used in connection with refrigeration system,
must be installed so chilled medium is piped in parallel with
the boiler with appropriate valves to prevent chilled medium
from entering the boiler.
Boiler piping system of hot water boiler connected to heating
coils located in air handling units where they may be exposed
to refrigerated air circulation must be equipped with ow
control valves or other automatic means to prevent gravity
circulation of the boiler water during the cooling cycle.
5 - HYDRONIC PIPING
5.8 Available Pump Head for Central Heating
Design heating system to ensure minimum water ow rate
of at least 7.8 gpm (3250 L/H).
This high static head pump is t for installation on any type
of single or double-pipe heating systems. Automatic air valve
incorporated in pump allows for quick air purging of heating
system.
5.9 Manifold Installation (supplied) See Figure 5-3
1. Boiler is supplied with union connection installed on boiler
piping for connection to manifold.
2. Congure manifold to suit the application.
Note Identify BOILER supply and return when
installing manifold.
3. Apply sealant and tighten manifold in place. Check for
leaks.
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Table 4 - System Piping Congurations
Single Boiler/
Multiple Boilers Primary/Secondary Pumping Zone Valves Figure 5-4 / 5-6 /5-8
Zone Pumps Figure 5-5 / 5-7
5 - HYDRONIC PIPING
Note Illustrations are meant to show system piping
concept only. Installer responsible for all
equipment and detailing required by authority
having jurisdiction.
Piping Legend
Boiler
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5 - HYDRONIC PIPING
FIGURE 5-4 - Primary/Secondary, Zoned, WITH ZONE VALVES, (Optional) Indirect Tank
T & P Relief
Valve to
Drain
Cold
Water
Supply
Optional
Indirect
DHW Tank BOILER
Make-up
Water
Supply
Tank
Sensor
CH /System
Pump
ASME
Relief
Valve
1
DHW Pump
112” (305mm) Maximum
Separation
Note
Note * 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.
Note
Use external pump relay or Argo Zone
Control to interface system pump to boiler.
* Hot
Water
Supply
Tempered
S
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5 - HYDRONIC PIPING
FIGURE 5-5 - Primary/Secondary, Zoned, WITH ZONE PUMPS, (Optional) Indirect Tank
T & P Relief
Valve to
Drain
Cold
Water
Supply
Optional
Indirect
DHW Tank
BOILER
Make-up
Water
Supply
Tank
Sensor
CH /System
Pump
ASME
Relief
Valve
1
DHW Pump
1
112” (305mm) Maximum
Separation
Note
Note * 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.
* Hot
Water
Supply
Tempered
S
Note
Use external pump relay or Argo Zone
Control to interface system pump to boiler.
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# BOILERS ON
PIPE BRANCH
1
2
3
4
5
6
7
8
PIPE
SIZE
1-1/4
2
2-1/2
3
3
4
4
4
5 - HYDRONIC PIPING
FIGURE 5-6 - Multiple Boilers with Common Primary Secondary, Zone Valves and (Optional) Indirect
UP TO 6 BOILERS
# Boilers on
Pipe Branch
Pipe
Size
2 2
3 2½
4 3
5 3
6 4
7 4
8 4
1
12” (305mm) Maximum
Separation
Note
Note
* 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.
Note
Use external pump relay or Argo Zone
Control to interface system pump to boiler.
BOILER
ASME
Relief
Valve
ASME
Relief
Valve
ASME
Relief
Valve
System
Temperature
Sensor
S
Optional
Indirect
DHW Tank
Tank
Sensor
CH/System
Pump
T & P
Relief
Valve to
Drain
*Tempered
Hot Water
Supply
Make-up
Water
Supply
1
Cold Water
Supply
BOILER
BOILER
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5 - HYDRONIC PIPING
1
12” (305mm) Maximum
Separation
Note
Note
FIGURE 5-7 - Multiple Boilers with Common Primary Secondary, Zone Pumps and (Optional) Indirect
# BOILERS ON
PIPE BRANCH
1
2
3
4
5
6
7
8
PIPE
SIZE
1-1/4
2
2-1/2
3
3
4
4
4
UP TO 6 BOILERS
# Boilers on
Pipe Branch
Pipe
Size
2 2
3 2½
4 3
5 3
6 4
7 4
8 4
* 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.
Note
Use external pump relay or Argo Zone
Control to interface system pump to boiler.
BOILER BOILER
BOILER
ASME
Relief
Valve
ASME
Relief
Valve ASME
Relief
Valve
System
Temperature
Sensor
S
Optional
Indirect
DHW Tank
Tank
Sensor
CH/System
Pump
T & P
Relief
Valve to
Drain
*Tempered
Hot Water
Supply
Make-up
Water
Supply
1
Cold
Water
Supply
P/N 240011662, Rev. E [09/15/2017]

19
5 - HYDRONIC PIPING
FIGURE 5-8 - Multiple Boilers with Individual Primary Secondary, Zone Valves and (Optional) Indirect
# BOILERS ON
PIPE BRANCH
2
3
4
5
6
7
8
PIPE
SIZE
2
2-1/2
3
3
4
4
4
UP TO 6 BOILERS
1
12” (305mm) Maximum
Separation
Note
Note
* 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.
Note
Use external pump relay or Argo Zone
Control to interface system pump to boiler.
Note
SYSTEM PUMP 2 is required if
System Pump 1 capacity is less
than total boiler capacity.
# Boilers on
Pipe Branch
Pipe
Size
2 2
3 2½
4 3
5 3
6 4
7 4
8 4
S
Optional
Indirect
DHW Tank
Tank
Sensor
CH/System
Pump 1 - SEE
NOTE
Make-up
Water
Supply
ASME
Relief
Valve
ASME
Relief
Valve
ASME
Relief
Valve
System
Temperature
Sensor
T & P
Relief
Valve to
Drain
Cold
Water
Supply
*Tempered
Hot Water
Supply
1
1
1
BOILERBOILER
BOILER
CH/System
Pump 2 - SEE
NOTE
P/N 240011662, Rev. E [09/15/2017]

20
6.1 General
• Installations shall comply with Authority having jurisdiction
and in absence of such with:
»U.S. ANSI Z223.1 /NFPA 54 in the United States
»CSA B149.1 in Canada.
• This boiler requires a dedicated direct vent system or may
be category IV Indoor air.
• Vent connections serving appliances vented by natural draft
shall not be connected into any portion of mechanical draft
systems operating under positive pressure.
• Materials used in the U.S. shall comply with Authority
having jurisdiction and in absence of such with: ANSI/
ASTM D1785, ANSI/ASTM F441, ANSI/ASTF493, UL1738 or
ULS636.
• Canadian installations only: All venting material, primer
and glue must be listed to ULC S636.
• Canadian installations only: First 3 ft. (0.9m) of plastic vent
pipe from vent connector must be readily accessible for
visual inspection.
6 - COMBUSTION AIR AND VENT PIPING
WARNING
Fire, explosion, and asphyxiation hazard. Improper
installation could result in death or serious
injury. Read these instructions and understand all
requirements before beginning installation.
!• Support piping in accordance with pipe manufacturer's
instruction and authority having jurisdiction. In absence
of manufacturer's instruction use pipe hooks, pipe straps,
brackets, or hangers of adequate and strength located
at intervals of 4 ft (1.2m) or less. Allow for expansion/
contraction of pipe.
6.2 Removal of Existing Boiler From Common Vent
System
When existing boiler is removed from common venting
system, common venting system is likely to be too large for
proper venting of appliances remaining connected to it.
After removal of existing boiler, following steps shall be
followed with each appliance remaining connected to common
venting system placed in operation, while other appliances
remaining connected to common venting system are not in
operation:
• Seal any unused openings in common venting system.
• Visually inspect venting system for proper size and
horizontal pitch. Determine there is no blockage or
restrictions, leakage, corrosion and other deciencies which
could cause an unsafe condition.
• When practical, close all building doors, windows, and
all doors between space in which appliances remaining
connected to common venting system are located and
other spaces of building. Turn on clothes dryer and any
appliance not connected to common venting system.
Turn on exhaust fans, such as range hoods and bathroom
exhaust so they will operate at maximum speed. Do not
operate summer exhaust fan. Close replace dampers.
• Turn on appliance being inspected. Follow lighting
instructions. Adjust thermostat so appliances will operate
continuously.
• Test for spillage at draft hood relief opening after 5
minutes of main burner operation. Use ame of match or
candle, smoke from cigarette, cigar or pipe.
• Determine each appliance remaining connected to common
venting system properly vents when tested as outlined
above. Then return doors, windows, exhaust fans and any
other gas-burning appliance to their previous condition of
use.
• Any improper operation of common venting system
should be corrected so installation conforms with National
Fuel Code, ANSI Z223.1/NFPA 54 and/or Natural Gas
and Propane Installation Code, CAN/CSA B149.1. When
re-sizing any portion of common venting system, common
venting system should be re-sized to approach minimum
size as determined using appropriate tables in Chapter 13
of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/
or Natural Gas and Propane Installation Code, CAN/CSA
B149.1.
WARNING
Cascade venting of condensing boilers shall be
vented with manufacturer's polypropylene venting
material. Failure to follow these instructions could
result in death or serious injury.
!
WARNING
ABS/PVC venting shall not to be used this product.
Use of DWV plumbing pipes to vent this boiler shall
be prohibited.
Use of cellular core PVC (ASTM F891), cellular core
CPVC, or Radel® (polyphenolsulfone) in venting
systems shall be prohibited.
Covering non-metallic vent pipe and ttings with
thermal insulation shall be prohibited.
Failure to follow these instructions could result in
death or serious injury.
!
Note Follow venting manufacturer's equivalent lengths
for speciallity ttings.
P/N 240011662, Rev. E [09/15/2017]