UTICA BOILERS UCS-380 User manual

UCS 380
CONDENSING
GAS FIRED
BOILER

CONTENTS :
INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
(240011662)
MULTIPLE BOILER
WIRING GUIDE
(240011815)
HEAT EXCHANGER
CLEANING INSTRUCTIONS
(240011775)
REQUIRED
INSPECTION SPECIAL
(240011561)
BACK COVER

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
PN 240011662 REV. K[01/31/2020]

2
Fully Assembled Boiler Safety Relief Valve Temperature Pressure
Gauge Drain Valve
Used for measuring outside
temperature Includes essential documents
Gas Shuto Valve Outdoor Sensor Document Package Manifold (See page 13
5.8 for install instructions)
VERIFY CONTENTS RECEIVED
PN 240011662 Rev. K [01/31/2020]

3
TABLE OF CONTENTS
1 - Important Information....................................5
2 - Introduction....................................................6
3 - Component Listing ..........................................7
4 - Locating Boiler................................................8
5 - Hydronic Piping.............................................10
5.1 General .....................................................10
5.2 Special Conditions.......................................10
5.3 Safety Relief Valve And Air Vent....................11
 ......................................11
5.5 Trim Piping.................................................12
5.6 System Piping ............................................12
5.7 Heating System And Refrigeration.............. 13
5.8 Manifold Installation (Supplied) ....................13
6 - Combustion Air And Vent Piping....................19
6.1 General .....................................................19
6.2 Removal Of Existing Boiler From Common Vent
System...........................................................19
 .................................................20
6.4 Approved Venting Materials..........................21
6.5 Coaxial .....................................................21
6.6 Twin Pipe Polypropylene And CPVC Systems......23
6.7 Twin Pipe Spring Clamp Instructions...............23

6.9 Side Venting Terminal Requirements .......... 29
6.10 Multiple Boiler Venting - General ...............32
6.11 Multiple Boiler Venting - Mounting ........... 32
6.12 Multiple Boiler Venting - Venting Layout .... 34
6.13 Multiple Boiler Venting - Parameter Setting. 36
6.14 Condensate Piping.....................................37
7 - Gas Supply Piping..........................................38
7.1 General .....................................................38
7.2 LP Conversion ............................................38
8 - Electrical Connections...................................40
8.1 General .....................................................40
8.2 Electric Knockouts .....................................40
8.3 Electrical Connections..................................40
8.4 Access To Connection Block..........................41
8.5 Main Supply Connection...............................41
8.6 Shutdown Input..........................................42
8.7 Release Input.............................................42
8.8 Optional Electrical Connections: ...................42
8.9 Outdoor Temperature Sensor........................45
8.10 Central Heating Thermostat........................45
8.11 DHW Indirect Water Heater........................46
8.12 Frost Protection ........................................46
8.13 Pump Anti-Seize Protection ........................46
9 - Start Up Procedure........................................49
9.1 Fill Condensate Trap With Water....................49
9.2 Commission Setup (Water)...........................49
9.3 Commission Setup (Gas) .............................50
9.4 Commission Setup (Electric).........................50
9.5 Control Panel..............................................51
9.6 Deaeration Function....................................52
9.7 Commissioning...........................................53
9.8 Before Gas Conversion ................................53
9.9 Gas Conversion (Propane)............................53
9.10 Combustion Setup (High-Fire).....................54
9.11 Combustion Setup (Low-Fire) .....................54
9.12 Operational Check.....................................54
9.13 User Level Parameters...............................55
9.14 Installer Level Parameters..........................55
9.15 Parameters Settings ..................................56
9.16 Reading Measured Values..........................59
9.17 Status And Sub-Status...............................60
9.18 Return To The Factory Settings ...................61
10 - Operating Instructions................................62
10.1 Sequence Of Operation..............................62
10.2 Operating Instructions...............................62
 ......................62
11 - General Maintenance And Cleaning .............63
12 - Ratings And Capacities................................67
13 - Trouble Shooting.........................................68
13.1 Troubleshooting ........................................68
13.2 ShutdownsandLock-Outs.............................70
13.3 Error History ............................................73
13.4 Error History Readout ................................73
13.5 Optional Sensors.......................................74
Troubleshooting Chart 1 ....................................75
Troubleshooting Chart 2 ....................................76
Troubleshooting Chart 3 ....................................77
Troubleshooting Chart 4 ....................................78
Troubleshooting Chart 5 ....................................79
Troubleshooting Chart 6 ....................................80
Troubleshooting Chart 7 ....................................81
Troubleshooting Chart 8 ....................................81
Troubleshooting Chart 9 ....................................82
Troubleshooting Chart 10 ..................................83
Troubleshooting Chart 11 ..................................84
Temperature-Resistance Chart............................85
14 - Glossary......................................................86
PN 240011662 Rev. K [01/31/2020]

4
Table 1: Physical Data
Model 380
Width (A) 
Height (B) 
Depth (C) 
Bottom Cabinet (D)
Access from Back or Sides of Jacket 
Water
Connections
Size 1-½ (38.1mm)
Location (G) 
Location (H)
Return 
Location (I)
Supply 
Gas
Connection Location (L) 
Size 
Condensate Drain
Connection (J)
Location (J) 
Size 
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)

(22.2m)
Wire Knockouts
D
Front of Boiler
Front of Boiler
L
Front of Boiler
I
PN 240011662 Rev. K [01/31/2020]

5
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.

glossary for additional information.
1. Safety Information
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.
!!
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.
!
FOR YOUR SAFETY READ BEFORE OPERATING
Hot Water Can Scald!
Water heated to temperature for clothes washing,
dish washing and other sanitizing needs can scald
and cause permanent injury.

persons are more likely to be permanently injured by


tap or draw their own bath.

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.
• 
DANGER
!
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.
Note Used to address practices not related to
personal injury.
PN 240011662 Rev. K [01/31/2020]

6
Check our website frequently for updates: www.ecrinternational.com
Information and specications outlined in this manual in eect at the
time of printing of this manual. ECR International R 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.
• 
(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: 10:1 ratio.
• Integral Dual Limit.
• 
• 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 prior to installation.
Field source:
• 
• Manual Reset External High Temperature Limit.
2 - Introduction
2.1 Installation shall conform to requirements of authority
having jurisdiction or in absence of such requirements:
• United States
•  .
• 
• Canada
• 
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


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:

2.4 Manufacturer recommends use of Carbon
Monoxide monitor may be requirement of local
jurisdiction.
PN 240011662 Rev. K [01/31/2020]

7
3 - COMPONENT LISTING
1Condensate trap
2Gas Valve
3Fan
4Air/gas mixer
5Heat exchanger
6Thermal fuse (#6 on wire diagram)
7
8Exhaust test port
9Intake test port
10 Flue sensor
11 Automatic air vent
12 
wire diagram)
13 Burner sight glass
14 Ignition/Flame detection electrode
15 Spark generator
16 Auxiliary control board box
17 Air/gas venturi
18 Pump
19 Boiler drain
20 Low water pressure switch
ACondensate trap drain
BGas inlet connection
CHeating supply connection
DHeating return connection
1
2
3
4
5
7
6
8910
11
13
12
14
15
16
17
18
19
20
PN 240011662 Rev. K [01/31/2020]
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.
• 
• 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

• 
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)  15-3/4
(400 mm)
Left Side (B))
      
(45 mm)        (45 mm)
Right Side (C)
      
(45 mm)        (45 mm)
Front (D)
      
(45 mm)         (450 mm)
Back (E)
 
Bottom (F)
 
Combustion Air/Vent
piping
 
(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 

piping can be damaged if subjected to excessive
torque.
PN 240011662 Rev. K [01/31/2020]
UCS-380

9
4 - LOCATING BOILER
A
E
ED
A
CB
A
FLOOR
FLOOR
Boiler Front
View
Boiler Left Side View
FIGURE 4-1a Clearance to Combustible Materials FIGURE 4-2a Service Clearances - Boiler Front View
FIGURE 4-1b Clearance to Combustible Materials
FIGURE 4-2b Service Clearances - Boiler Left Side
View
Boiler
Front View
FIGURE 4-2c Combustible Clearances - Closet
Installation

Boiler Left
Side View Minimum Service
clearance to front
of boiler
17 3/4 "
(  mm)
TOP VIEW
1 3/4 "
(  mm) 1 3/4 " (  mm)
1 3/4 "
(
 mm)
BACK
CLEARANCES REQUIRED FOR CLOSET
INSTALLATION
0 in. /0 mm between the Back of the Unit and the wall
(See Table 2, page 8)

(45mm) 
(45mm)
 




(45mm)
(See Table 2, page 8)
PN 240011662 Rev. K [01/31/2020]

10
• It is necessary to semi-annually check the water quality
of central heating systems.
• Flush system to remove any solid objects such as metal

• 
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

working toward furthest air vent.
• Install a basket strainer if large amounts of sediment is
present. Keep basket clear of sediment build up.
• Install 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

and can deposit onto heat exchange surfaces and

and premature wear.
• 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

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.

prevent gravity circulation of boiler water during cooling
cycle.
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.
• 
boiler.
• If oil is present in system water, use approved detergent
to wash system.
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.
• 
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.
• 
water.
• Use only inhibited propylene glycol solutions

use with closed water heating system.
• 
glycol before installing new Boiler.
• Provide user with Material Safety Data Sheet

!
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.
PN 240011662 Rev. K [01/31/2020]

11
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 with spindle in vertical position.
• 
relief valve.
• Install discharge piping from safety relief valve.
• 
• 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 ForCheck Local Codes For
Maximum Distance ToMaximum Distance To
FloorFloor
5.4 Low Water Cuto
• Boiler is equipped with Low Water Pressure Switch.
• 

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, so it does not interfere with post purge.
WARNING
Fire, explosion hazard. Mount boiler vertically or
slightly tilted backward to insure proper function of

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

ACCEPTABLE
HEIGHT FOR
LWCO PROBE
Check Local Codes
For Maximum
Distance To Floor
12” (305mm)
Maximum
Separation
System
Return System Supply
PN 240011662 Rev. K [01/31/2020]

12
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 CodesCheck Local Codes
For MaximumFor Maximum
Distance To FloorDistance To Floor
5.5 Trim Piping
• Temperature - Pressure Gauge. Install temperature


visible.
• Boiler has integral drain valve located inside jacket directly
underneath pump. Install provided external drain valve.
5.6 System Piping
• 
• 
be required by local authority having jurisdiction to have

•  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.  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.
!
• 
• 
• Ensure washers supplied are utilized.
• 
• Fit union connections to supply and return on boiler.
A. If soldering to boiler, ensure unions are not connected
to the supply and return piping,
otherwise internal seals
may be damaged.
B. 

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
SafetySafety
ReliefRelief
ValveValve
TemperatureTemperature
PressurePressure
GaugeGauge
LWCOLWCO
System
Return System
Supply

ACCEPTABLE
HEIGHT FOR
LWCO PROBE
12” (305mm)
Maximum
Separation
PN 240011662 Rev. K [01/31/2020]

13
WARNING
Burn and scald hazard. Safety relief valve could
discharge steam or hot water during operation.
Install discharge piping per these instructions.
!
• 
Follow local code with respect to necessary distance to the

• 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

control valves or other automatic means to prevent gravity
circulation of the boiler water during the cooling cycle.
5 - HYDRONIC PIPING
5.8 Labor Savor Manifold Installation (supplied) See
Figure 5-3
1. Boiler is supplied with union connection installed on boiler
piping for connection to manifold.
2. 
Note Identify BOILER supply and return when
installing manifold.
3. Tighten manifold in place. Check for leaks.
PN 240011662 Rev. K [01/31/2020]

14
Table 4 - System Piping Congurations
Single Boiler/
Multiple Boilers Primary/Secondary Pumping  Figure 5-4 / 5-6
 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
WARNING
Burn, Scald Hazard! Water temperature over 125°F
(51°C) can cause severe burns and scalding. See
User's Manual before setting water temperature.
Failure to follow these instructions could result in
death or serious injury.
!
PN 240011662 Rev. K [01/31/2020]

15
5 - HYDRONIC PIPING
FIGURE 5-4 - Primary/Secondary, Zoned, WITH ZONE VALVES, (Optional) Indirect Tank
112” (305mm) Maximum
Separation required if Labor
Saver is NOT used.
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.
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
* Hot
Water
Supply
Tempered
S
Note
Refer to pump manufacturer
literature for proper pump sizing.
PN 240011662 Rev. K [01/31/2020]

16
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
1
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 
Control to interface system pump to boiler.
12” (305mm) Maximum
Separation required if Labor
Saver is NOT used.
Note
Refer to pump manufacturer
literature for proper pump sizing.
PN 240011662 Rev. K [01/31/2020]

17
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
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

Control to interface system pump to boiler.
12” (305mm) Maximum
Separation required if Labor
Saver is NOT used.
Note
Refer to pump manufacturer
literature for proper pump sizing.
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
DHW Pump
111
PN 240011662 Rev. K [01/31/2020]

18
5 - HYDRONIC PIPING
1
Note
Note
FIGURE 5-7 - Multiple Boilers with Common Primary Secondary, Zone Pumps 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
* 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

Control to interface system pump to boiler.
12” (305mm) Maximum
Separation required if Labor
Saver is NOT used.
Note
Refer to pump manufacturer
literature for proper pump sizing.
BOILER BOILER
BOILER
ASME
Relief
Valve
ASME
Relief
Valve
ASME
Relief
Valve
System
Temperature
Sensor
S
Optional
Indirect
DHW Tank
Tank
Sensor
DHW/System
Pump
T & P
Relief
Valve to
Drain
*Tempered
Hot Water
Supply
Make-up
Water
Supply
1
Cold
Water
Supply
PN 240011662 Rev. K [01/31/2020]