Dunkirk HELIX VX-399 Instruction manual

P/N 240010940 Rev. A [10/2015]
Manufactured by:
ECR International, Inc.
2201 Dwyer Avenue, Utica NY 13501
web site: www.ecrinternational.com
GAS BOILER
INSTALLATION, OPERATION &
MAINTENANCE MANUAL
Model
VX - 399

2P/N 240010940, Rev. A [10/2015]
Description
Item No. Illustration
Fully Assembled Boiler 1
*Safety Relief Valve ¾" 2
Elbow ¾" 90° 3
¾" Close Nipple 4
Temperature Pressure Gauge 2"
Shank 5
Aquastat 6
Well 3/4" x 1½" 7
Black Tee 1¼" x 1¼" x ¾" Tee 8
Nipple 1¼" Close (2) 9
Bushing ¾" x ¼" 10
Bushing 1¼" x ¾" (2) 11
LWCO Harness 12 For connection of LWCO
Aquastat Harness 13 For connection of Aquastat
Critical Installation Instruction 14 11" x 17" Page for critical installation issues.
Document Package 15 Includes essential documents.
VERIFY CONTENTS RECEIVED
3
* Boiler provided with 30 psig (206 kpa) safety relief valve. Field source safety relief valve if system pressure greater than 25 psig.
** Boiler provided with 75 psig temperature pressure gauge. Field source temperature pressure gauge if system pressure greater than 60 psig.
1
4
2
5
6
7
8
10
9
9
11

3P/N 240010940, Rev. A [10/2015]
OVERALL DIMENSIONS
BACK
OF BOILER
TOP FRONT
OF BOILER
* Note - Alternate Condensate Drain Connection on Right Side of Boiler.
Table 1 : Model 399 - Physical Data
Location Inches mm
A Width 27 ⅛ 688
B Height - Unit only 52 1320
C Depth 21 ⅛537
D Height unit w/ Piping 66 ¼ 1683
E Height unit w/vent 56 ¼ 1439
G/H
Return Water
from System
1¼" NPT
Location (G) 3 ¼ 83
Location (H) 5 ⅛ 130
H/I
Supply Water
to System
1¼" NPT
Location (H) 5 ⅛ 130
Location (I) 4 ¼ 108
J/K
Gas
Connection
1" NPT
Location (J) 9 ½ 241
Location (K)
8 ⁹/₁₆ 217
*L/*M
Condensate
Drain
Connection
3/4"NPT
Location (L)
12¹/₁₆ 316
Location (M)
11⁷/₁₆ 281
Weight Shipping 290 lbs 132kg
Unit 265 lbs 121kg
Vent Connector 4 102
LEFT SIDE
OF BOILER
RIGHTSIDE
OF BOILER
FRONT
OF BOILER
*M
*L
E
D
B
AC
H
K
G
J
I
H

4P/N 240010940, Rev. A [10/2015]
1 - Introduction...............................................................................................................................5
2 - Important Safety Information....................................................................................................6
3 - Component Listing .....................................................................................................................7
4 - Locating Boiler .........................................................................................................................10
5 - Hydronic Piping........................................................................................................................ 11
5.2 Special Conditions................................................................................................................. 11
5.3 Safety Relief Valve and Air Vent .............................................................................................. 11
5.4 Trim Piping........................................................................................................................... 12
5.5 System Piping....................................................................................................................... 12
6 - Combustion Air And Vent Piping...............................................................................................19
6.2 Removal of Existing Boiler From Common Vent System................................................................19
6.3 Venting Materials ................................................................................................................. 19
6.4 Vent Pipe Installation............................................................................................................. 20
6.5 Vent Termination .................................................................................................................. 21
6.6 Venting Congurations........................................................................................................... 26
6.7 Side Venting Terminal Requirements of : .................................................................................. 29
6.8 Multiple Boiler Venting Installation........................................................................................... 28
6.9 Condensate Piping................................................................................................................. 28
7 - Gas Supply Piping .................................................................................................................... 29
8 - Electrical Connections..............................................................................................................31
8.3 Line Voltage Connections........................................................................................................ 31
8.4 External Connections ............................................................................................................. 31
9 - Start Up Procedure................................................................................................................... 33
9.7 Perform CSD-1 Compliance Test ..................................................................................................... 38
9.8 Complete Start Up Procedure ......................................................................................................... 39
10 - Operating Instructions ........................................................................................................... 40
11 - General Maintenance And Cleaning ........................................................................................41
12 - Ratings And Capacities........................................................................................................... 43
13 - Trouble Shooting.................................................................................................................... 41
13 - Trouble Shooting (Temperature Resistance Chart).................................................................61
14 - Wiring Diagram ...................................................................................................................... 62
15 - Glossary ................................................................................................................................. 64
APPENDIX A - CONTROL MODULE....................................................................................................66
1.1 Introduction ........................................................................................................................ 66
1.2 Operation ........................................................................................................................... 66
1.3 Status Indication ................................................................................................................. 66
1.4 Sequence of Operation ......................................................................................................... 67
1.5 User Menu .......................................................................................................................... 69
OPTIONAL USER INTERFACE RELOCATION.....................................................................................79
PRIMARY LOOP EQUIVALENT LENGTH CALCULATIONS & PUMP SELECTION...............................80-81
TABLE OF CONTENTS

5P/N 240010940, Rev. A [10/2015]
1.1 Designated Use
• Hot water heating boiler.
• Indoor installation.
• Closet or alcove installation.
• Direct vent or single vent pipe boiler.
• For use with natural gas or liqueed petroleum gases
(LP/propane).
1.2 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 150 psig (1.03 MPa) maximum allowable
working pressure.
• Exceed 195°F (90.5°C) system design temperature.
1.3 Operational Features
• Modulating: 20-100%.
• Integral Dual Temperature Limit.
• CSD-1 Low Water Cutoff (LWCO) provided.
• Outdoor Temperature Reset Available.
• Heat exchanger over heat protection.
• Alternate mounting of User Interface Available
Information and specications outlined in this manual in effect at the
time of printing of this manual. ECR International, Inc. reserves the right to
discontinue, change specications or system design at any time without
notice and without incurring any obligation, whatsoever.
Check our website frequently for updates: www.ecrinternational.com
1 - INTRODUCTION

6P/N 240010940, Rev. A [10/2015]
NOTICE
Used to address practices not related to personal
injury.
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.
2.2 Become familiar with symbols identifying
potential hazards.
2.1 General
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.
!
2.3 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
2.4 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 may be required.
2.5 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 tter.
2 - IMPORTANT SAFETY INFORMATION

7P/N 240010940, Rev. A [10/2015]
FIGURE 3-1 Boiler Components (Viewed from Left side of Boiler) NOTE:
See Section 5-3
For Safety Relief
Valve Piping
Instructions
3 - COMPONENT LISTING
FIGURE 3-2 Jacket Removal (Viewed from Left Side of Boiler)
Disengage jacket latches on
both sides of boiler.
Lift jacket up and off
support at bottom of jacket
and remove.
Left Side
Jacket Latch
Bottom Jacket
Support
Safety Relief Valve
Limit Control
Temperature Pressure Gauge
Gas Supply
Combustion Air Inlet
Vent Connector
User Interface 25
Supply Water To Heating System
21
37
1
2
22
19
24
3
Return Water From
Heating System
4
Controls Tree
Left Side
Jacket Handle

8P/N 240010940, Rev. A [10/2015]
3 - COMPONENT LISTING
3.1 Component Listing - Refer to diagrams on
following pages.
Temperature Pressure Gauge (Field Installed)
User Interface - Displays information regarding
boiler condition. Allows adjustment of boiler
operating parameters. NOTE: Does not replace
thermostat used to control central heating space.
Supply Water Temperature Sensor
Combustion Air Blower Delivers proper quantity
of combustion air, receives fuel from gas valve,
mixes air and fuel sending mixture to burner for
combustion
Sight Glass - Permits observation of burner ame.
Heat Exchanger Strap and Buckle (2)
Transformer
DHW Pump, Primary Pump, CH Pump and
Blower Relays
Heat Exchanger
ASME Plate
Flue Collector
Return Water Temperature Sensor
Leveling Feet (4)
Safety Relief Valve Factory supplied, Field
installed. See section 5.
Burner not shown (see page 3)
Spare Fuse not shown (see page 3)
Flue Gas Test Port
Combustion Air Test Port
39
38
37
35
34
33
32
31
30
29
28
27
26
24
25
36
40
41
Combustion Air Inlet (4") See section 6.
Vent Connector (4") See section 6.
Gas Supply (1" NPT)
Return Water From Heating System - In,
(1¼" NPT) See section 5.
Gas Shutoff Valve Fuel supply isolation during
servicing. See section 7.
Gas (Control) Valve Delivers proper quantity of fuel
to Combustion Air Blower. (Not shown) See section 7.
Igniter
Flame Sensor
High Voltage Junction Box For connection of 120V
components. See section 8.
10 Amp Breaker
Low Voltage Terminal Strip Connection of all low
voltage wiring, including thermostat.
Wire Knockouts
Boiler Control Module with Spare Fuse
Heat Exchanger Surface Temperature Switch
(Not Shown
Vent Temperature Sensor
Condensate Drain Right or Left Option
Condensate must be piped to appropriate drain. See
section 6.
Drain Valve
Condensate Trap - Right or Left Option Boiler
produces a liquid (condensate) as a by-product of
combustion. (See page 33)
Control Tee (Field installed)
Low Water Cutoff (LWCO)
Supply Water Outlet to Heating System - Out,
(1¼" NPT) See section 5.
Manual Reset temperature Limit Control (Field
Installed)
Optional Air Filter
1
13
23
22
21
20
19
18
17
15
7
6
5
4
3
2
16
14
11
10
9
8
12

9P/N 240010940, Rev. A [10/2015]
3 - COMPONENT LISTING
Gas Shutoff
5
FIGURE 3-3 Boiler Components 399 MBH (View from Front of Boiler) As seen on front cover
User Interface
Low Water Cutoff
Gas Supply
Limit Control
Temperature Pressure
Gauge
Supply Water To
Heating System
Combustion Air Inlet
Vent Connector
Return Water From
Heating System
Gas (Control) Valve
(Behind Air Filter)
High Voltage Junction
Box
Low Voltage Terminal
Strip
Boiler Control Module
Fuse and Holder
W/ Spare Fuse
Transformer
DHW Pump, Primary
Pump, CH Pump and
Blower Relays
ASME Plate
Heat Exchanger Strap
and Buckle (2)
Igniter
Flame Sensor
Combustion Air Blower
Sight Glass
Supply Temperature
Sensor
Heat Exchanger
Flue Collector
Vent Temperature
Sensor
Condensate Drain
Connection
Condensate Trap
Drain Valve Return Water
Temperature Sensor
Leveling Feet (4)
Wire Knockouts
10 AMP Breaker
1
2
3
4
6
7
8
9
10
21
11
12
13
15
16
17
18
22
24
25
20
27
28
29
30
31
32
33
34
35
36
Controls Tree
19
37
Safety Relief Valve
(Rear)
Spare Fuse
39
Flue Gas Test Port
40
Combustion Air
Test Port
41
Optional Air Filter
23
Condensate Drain
Connection
16
Condensate Trap 18
26

10 P/N 240010940, Rev. A [10/2015]
FIGURE 4-1 Clearance to Combustible Materials
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.
• Protect gas ignition system components from water
(dripping, spraying, rain, etc.) during operation and
service (circulator replacement, condensate trap,
control replacement, etc.).
• Locate boiler on level, solid base as near outside vent
wall as possible and centrally located with respect to
heat distribution system as practical.
• Determine alternate User Interface mounting location
if desired. See page 81 - Optional User Interface
Relocation.
• 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 gure 4-1.
• Multiple Boilers can be placed side by side, or back to
back.
WARNING
Fire hazard. Do not install boiler on combustible
ooring or carpeting. Failure to follow these
instructions could result in death or serious injury.
!
• FOR INSTALLATION ON NON-COMBUSTIBLE FLOORS
ONLY - For installation on combustible ooring special
base shall be used. Boiler shall not be installed on
carpeting.
TABLE 2: BOILER CLEARANCES
Dimension Combustible
Materials (1) Service(1)(2)
Model 399 399
Top (A) 0" (0 cm) 18" (36 cm)
Left Side (B) 0" (0 cm) 6" (0 cm)
Right Side (C) 0" (0 cm) 6" (0 cm)
Front (D) 0" (0 cm) 24" (16 cm)
Back (E) 0" (0 cm) 0" (0 cm)
Combustion Air/Vent
piping
0" (0 cm) 6" (16 cm)
Hot Water Piping See local code 6" (16 cm)
(1) Required distances measured from boiler jacket.
(2) Service clearance recommendation.
C
B
FLOOR
4 - LOCATING BOILER
FRONT OF BOILER
A
FLOOR
LEFT SIDE
OF BOILER
A
ED

11 P/N 240010940, Rev. A [10/2015]
5.1 General
• Install piping in accordance with authority having
jurisdiction.
NOTICE
Use two (2) wrenches when tightening boiler's
tting and pipes. Boiler's internal piping can be
damaged if subjected to excessive torque.
• Support system piping and safety relief valve discharge
piping. Boiler's internal piping can be damaged if subjected
to excessive weight.
• Size central heating pump (and domestic hot water pump,
if used) for system requirements only.
• Thoroughly clean and ush system before connecting to
boiler.
• If oil is present in system water, use approved detergent
to wash system.
• Flush system to remove any solid objects such as metal
chips, bers, or Teon tape, etc.
5.2 Special Conditions
• 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 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.
5.3 Safety Relief Valve
NOTICE
Boiler rated at 150 psig (1.03 MPa) maximum
allowable working pressure. Boiler provided with 30
psig (206 kPa) safety relief valve. Field source safety
relief valve for system pressures greater than 25 psig.
Temperature Pressure Gauge satisfactory for 60 psig
operation. Field source temperature pressure gauge
for system pressures greater than 60 psig.
• Install safety relief valve. 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. See
gure 5-2.
• Use ¾" or larger pipe.
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.
• 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.
!
NOTICE
Do not expose boiler and condensate piping to
freezing temperatures.
FIGURE 5-1 Safety Relief Valve (Viewed from top, left
side of boiler)
Position Safety Relief Valve to provide
space for discharge piping.
5 - HYDRONIC PIPING
¾" Close Nipple
Safety Relief
Valve
Temperature
Pressure
Gauge
Controls Tree
¾" Close Nipple
1¼" Close Nipple
Bushing 1¼" x ¾"
Elbow ¾" 90°
Bushing
1¼" x ¾"
Bushing
¾" x ¼"
Tee 1¼" x ¼" x ¾"
Limit Well ½"
Aquastat
Limit Control

12 P/N 240010940, Rev. A [10/2015]
• 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).
• Arrange piping to prevent water dripping onto boiler.
5.4 Low Water Cutoff (LWCO) and Aquastat
• Unit shipped with LWCO installed.
• Hi Temp Aquastat (provided), if required connect
wires to terminal strip. Maximum limit setting is
190°F (88°C). Use thermal grease.
5.5 Trim Piping
• Temperature - Pressure Gauge. Install temperature
pressure gauge using bushings provided with boiler.
See gures 5-1 and 5-3.
• Protect chassis grommets from heat damage.
5.6 System Piping
• See Table 3 for basic system piping congurations.
• See Table 3 for general boiler pump sizing
requirements.
• Systems with automatic ll valves require back ow
prevention device.
• Single boiler system. See gures 5-5 through 5-7 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 5-8A, B & C for
general guidance. Additional considerations:
• Control system requires equivalent water
temperatures entering each boiler to properly
sequence and adjust system supply temperature.
• Install multi boiler sensor kit. See "Parts, Kits &
Optional Accessories" manual for part number.
• * Boiler control provides integrated high limit as
primary limit control. Aquastat is provided for those
jurisdictions with this requirement. See gure 5-3.
WARNING
Burn and scald hazard. Safety relief valve could
discharge steam or hot water during operation.
Install discharge piping per these instructions.
!
FIGURE 5-2 Safety Relief Valve Discharge Piping
(View Rightside of Boiler)
5 - HYDRONIC PIPING
FIGURE 5-3 Limit Control, Limit Well, and Plug
(View Left Side of Boiler)
Safety Relief
Valve
¾" Close Nipple
Check Local Codes
For Maximum
Distance To Floor
Temperature
Pressure
Gauge
Tee 1¼" x ¼" x ¾"
Limit Well ½"
Aquastat
Limit Control
Supply Water
Controls Tree

13 P/N 240010940, Rev. A [10/2015]
5 - HYDRONIC PIPING
Piping Legend
Table 4 - System Piping Congurations
Single Boiler
Primary/Secondary
Two Pipe Zoned System
With Zone Valves gure 5-5
With Zone Pumps gure 5-6
Primary/Secondary Pumping Without DHW Tank gure 5-7A
With DHW Tank gure 5-7B
Multiple Boilers
Primary/Secondary
Two Pipe Zoned System
With Zone Valves gure 5-8A
With Zone Pumps Not Shown
Primary/Secondary Pumping
Without DHW Tank gure 5-8B
With DHW Tank gure 5-8C
NOTICE
Illustrations are meant to show system piping
concept only. Installer is responsible for all
equipment and detailing required by authority
having jurisdiction.
NOTICE
Arrange piping to prevent water dripping onto
boiler.
Primary Loop Equivalent Length Calculation & Pump
Selections may be found on pages 84 thru 87 of this
manual.
Table 3 - General Boiler Pump Sizing Chart
System ∆T Flow, GPM Feet Head
20 38 41
30 25 18
40 19 12
50 15 8
60 12 5
See Table 3 for primary pump sizing. Primary circuit pipe
components must also be included to size pump.

14 P/N 240010940, Rev. A [10/2015]
FIGURE 5-5 Single Boiler Primary/Secondary Two-Pipe Zoned System With Zone Valves
FIGURE 5-6 Single Boiler Primary/Secondary Two-Pipe Zoned System With Zone Pumps
DHW
Pump
CH/System
Pump
DHW
Pump
Zone
Pump
5 - HYDRONIC PIPING
Primary Loop Equivalent Length
Calculation & Pump Selections
may be found on pages 84 thru
87 of this manual.
12" Max. Separation
12" Max. Separation
General
Boiler Pump
on Return
Side
General
Boiler Pump
on Return
Side

15 P/N 240010940, Rev. A [10/2015]
Heating Load Heating Load
Heating Load
CH/System
Pump
12"(305mm) Maximum separation
Existing closely
spaced tees
in primary
system loop
FIGURE 5-7A Single Boiler Using Primary/Secondary Pumping
FIGURE 5-7B Single Boiler Using Primary/Secondary Pumping With DHW Tank
CH/System
Pump
12"(305mm) Max. separation
Existing closely spaced tees
in primary system loop
Limit length
to
5' (1.6m)
12"(305mm)
Maximum
separation
Limit length
to
5' (1.6m)
5 - HYDRONIC PIPING
Primary Loop Equivalent Length
Calculation & Pump Selections
may be found on pages 84 thru
87 of this manual.
General
Boiler Pump
on Return
Side
General
Boiler Pump
on Return
Side

16 P/N 240010940, Rev. A [10/2015]
FIGURE 5-8A Multiple Boiler Primary/Secondary Two Pipe Zoned System With Zone Valves - (See Multiple Boiler
Guide)
5 - HYDRONIC PIPING
Up to 16
boilers
DHW
Pump
(See Multiple Boiler Guide)
CH/System
Pump 12"/305mm Maximum Separation
System
Temperature
Sensor
Size common piping
per maximum heat
capacity of entire
system
Limit
length to
5' (1.6m)
General
Boiler Pumps
on Return
Side

17 P/N 240010940, Rev. A [10/2015]
FIGURE 5-8B Multiple Boilers Using Primary/Secondary Pumping
5 - HYDRONIC PIPING
Existing closely spaced tees
in primary system loop
12"/305mm
Maximum
Separation
Up to 16
boilers
CH/System
Pump
12"/305mm Maximum Separation
System
Temperature
Sensor
Size common piping
per maximum heat
capacity of entire
system
Limit
length to
5' (1.6m)
General
Boiler Pumps
on Return
Side

18 P/N 240010940, Rev. A [10/2015]
5-8C Multiple Boilers Using Primary/Secondary Pumping with DHW Tank
Existing
closely spaced
tees
in primary
system loop
CH/System
Pump
12"/305mm Maximum Separation
System
Temperature
Sensor
Size common piping
per maximum heat
capacity of entire
system
Limit
length to
5' (1.6m)
5 - HYDRONIC PIPING
General
Boiler Pumps
on Return
Side
Up to 16
boilers

19 P/N 240010940, Rev. A [10/2015]
6.1 General
This boiler requires a dedicated direct vent system.
Install combustion air and vent piping in accordance
with these instructions, authority having jurisdiction,
and:
• USA - National Fuel Gas Code, ANSI 223.1/NFPA 54.
• Canada - Natural Gas and Propane Installation Code,
CAN/CSA B149.1
Vent connections serving appliances vented by natural draft
shall not be connected into any portion of mechanical draft
systems operating under positive pressure.
Install vent system in accordance with these instructions.
This boiler is not approved for common venting.
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.
6.3 Venting Materials
• See Table 4
WARNING
Use of cellular core PVC for venting ue gas could
result in death, or serious injury.
!
6 - COMBUSTION AIR AND VENT PIPING
WARNING
Covering non-metallic vent pipe and ttings with
thermal insulation shall be prohibited.
!
Table 4 - Combustion air and vent pipe ttings
must conform with the following:
Item Material Standards
Vent Pipe
and Fittings
PVC schedule 40 ANSI/ASTM D1785
PVC - DWV ANSI/ASTM D2665
CPVC schedule 40 ANSI/ASTM D1784/
F441
SDR-21 & SDR-26 PVC ANSI/ASTM D2241
ABS-DWV ANSI/ASTM D2661
Schedule 40ABS ANSI/ASTM F628
PP (Polypropylene)
Pipe and Components
UL 1738
ULC S636-08
Pipe
Cement/
Primer
PVC ANSI/ASTM D2564
CPVC ANSI/ASTM F493
Schedule 40 ABS ANSI/ASTM D2235
• IPEX is approved vent manufacturer in Canada listed
to ULC-S636.
• IPEX System 636 Cements and Primers are approved
in Canada listed to ULC-S636.
Use of cellular core PVC (ASTM F891), cellular core CPVC, or Radel® ,
(Polyphenolsulfone) in venting systems shall be prohibited.

20 P/N 240010940, Rev. A [10/2015]
Minimum/Maximum Vent
Lengths
Model 4” (102mm) Pipe
Min. 6 Ft (1.8 m)
Max. 100 Ft (30.5 m)
6 - COMBUSTION AIR AND VENT PIPING
WARNING
Vent extending through exterior wall shall not
terminate adjacent to wall or below building
extensions such as eaves, balconies, parapets or
decks. Failure to comply could result in death or
serious injury.
!
6.4 Vent Pipe Installation
• Minimum and maximum combustion air and vent pipe
lengths listed in Table 5. Pipe length counted from
combustion air connector to termination.
• 90° elbows equivalent to 5.0 ft (1.6 m). 45° elbows
equivalent to 3.5 ft (1.1 m).
• Use exible Polyproplyene piping (PP) in a vertical
position only. Check PP pipe manufacturer for details.
Each foot of PP exible pipe is equivalent to 2⅝feet of
smooth pipe of same diameter.
• Slope vent pipes minimum 1/4" per foot (21 mm/m)
back toward boiler. Support horizontal sections to
prevent sags capable of accumulating condensate.
• 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.
• Combustion air and vent piping must be air tight and
water tight.
• Certied vent system components must NOT be
interchanged with other vent systems or unlisted pipe/
ttings.
• Canadian installations only. All venting material, primer
and glue must be listed to ULC S636.
• Canadian installations only. First 3 ft (0.9 m) of
plastic vent pipe from vent connector must be readily
accessible for visual inspection.
6.5 Vent Termination
• Terminate combustion air and vent pipes with ttings
or concentric vent kit.
A. See "Parts, Kits and Optional Accessories" manual
for concentric vent kit part numbers.
B. Use horizontal pipe for vent and 90° elbow for
combustion air termination when using ttings.
• Separate vent terminal from air inlet terminal to
prevent ue gas recirculation. If T-Terminal is used on
ue pipe at sidewall, air inlet terminal shall be at least
36" or more away from vent terminal.
• Locate combustion air termination as far as possible
from swimming pool, swimming pool pump house, and
other sources of airborne chlorine.
• Locate combustion air and vent terminals as required
by authority having jurisdiction.
Table 5 - Combustion Air and Vent Piping Length
For Example: Boiler can be installed on outside wall and
vented with one 90° elbow and 1 ft (0.30 m) of vent pipe.
Table 6 -Equivalent Length of Venting Components
Equivalent Length of Venting Components
Component Feet Meters
90° Elbow 5 1.6
45° Elbow 3 1/2 1.1
2" x 4" Adapter 0 0
3" x 4" Adapter 0 0
Concentric Vent Kit 5 1.6
Polypropylene Flexible Pipe per Foot 2 5/8 0.8