Lochinvar NKC 110 Supplement

100275091_2000533998_Rev C
FIRE TUBE COMBI
™
Noble Combi Boiler
Installation & Service Manual
Models: 110 - 199
This manual must only be used
by a qualified heating installer
/ service technician. Read all
instructions, in this manual before
installing. Perform steps in the
order given. Failure to comply
could result in severe personal
injury, death, or substantial
property damage.
WARNING
Save this manual for future reference.

2
Hazard definitions
The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or
to important information concerning the life of the product.
DANGER
WARNING
CAUTION
CAUTION
NOTICE
DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious
injury.
WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious
injury.
CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate
injury.
CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not
avoided, may result in property damage.
NOTICE indicates special instructions on installation, operation, or maintenance that are important but not
related to personal injury or property damage.
HAZARD DEFINITIONS................................................................. 2
PLEASE READ BEFORE PROCEEDING .............................. 3
THE NOBLE COMBI BOILER --HOW IT WORKS .............. 4-5
RATINGS ............................................................................................ 6
1. DETERMINE BOILER LOCATION
Provide Clearances .............................................................................. 7
Provide Air Openings to Room......................................................... 9
Wall Mounting Location ................................................................... 9
Residential Garage Installation.......................................................... 9
Vent and Air Piping ............................................................................ 9
Prevent Combustion Air Contamination ........................................ 9
Corrosive Contaminants and Sources............................................ 10
Using an Existing Vent System to Install a New Boiler............... 10
Removing a Boiler from Existing Common Vent ........................ 11
2. PREPARE BOILER
Remove Boiler from Wood Pallet ................................................... 12
Gas Conversions .......................................................................... 12-13
Mounting the Boiler.......................................................................... 13
3. GENERAL VENTING
Direct Venting Options .................................................................... 14
Install Vent and Combustion Air Piping....................................... 15
Sizing ................................................................................................... 16
Max. Allowable Vent Piping Lengths............................................. 16
Materials.............................................................................................. 16
Optional Room Air............................................................................ 17
PVC/CPVC......................................................................................... 18
Polypropylene......................................................................................19
Stainless Steel Vent............................................................................ 20
4. SIDEWALL DIRECT VENTING
Vent/Air Termination - Sidewall .............................................. 21-23
Determine Location ............................................................... 21-22
Prepare Wall Penetrations .......................................................... 23
Multiple Vent/Air Terminations..................................................... 23
Sidewall Termination - Optional Concentric Vent................ 24-26
5. VERTICAL DIRECT VENTING
Vent/Air Termination - Vertical............................................... 27-28
Determine Location ..................................................................... 27
Prepare Roof Penetrations .......................................................... 28
Multiple Vent/Air Terminations..................................................... 28
Vertical Termination - Optional Concentric Vent................. 29-30
Alternate Vertical Concentric Venting .................................... 31-32
6A. HYDRONIC PIPING
System Water Piping Methods ........................................................ 33
Low Water Cutoff Device................................................................. 33
Chilled Water System........................................................................ 33
Freeze Protection ............................................................................... 33
General Piping Information............................................................. 33
Near Boiler Piping Components ..................................................... 34
Hydronic Piping Diagrams ......................................................... 36-39
6B. DOMESTIC WATER PIPING
Scalding ............................................................................................... 40
Water Chemistry................................................................................ 40
Near Heater Piping Components.................................................... 40
Domestic Water Piping Diagrams ............................................ 41-43
7. GAS CONNECTIONS
Connecting Gas Supply Piping........................................................ 44
Natural Gas......................................................................................... 45
Pipe Sizing for Natural Gas ........................................................ 45
Natural Gas Supply Pressure Requirements ............................ 45
Propane Gas........................................................................................ 45
Pipe Sizing for Propane Gas ....................................................... 45
Propane Supply Pressure Requirements................................... 45
Check Inlet Gas Supply............................................................... 46-47
Gas Pressure ....................................................................................... 47
Gas Valve Replacement .................................................................... 47
8. FIELD WIRING
Line Voltage Connections ................................................................ 48
Low Voltage Connections ................................................................ 48
9. CONDENSATE DISPOSAL
Condensate Drain.............................................................................. 51
10. STARTUP............................................................................ 52-60
11. OPERATING INFORMATION
General ................................................................................................ 61
Menus............................................................................................. 61-62
Control Inputs and Outputs ....................................................... 63-64
Cascade.................................................................................................65
Protection Features....................................................................... 65-66
Sequence of Operation................................................................ 66-68
12. MAINTENANCE
Maintenance and Annual Startup............................................. 69-74
13. TROUBLESHOOTING .................................................... 75-86
14. DIAGRAMS
Ladder Diagram (Standard) ............................................................. 87
Wiring Diagram (Standard)............................................................. 88
Revision Notes.................................................................... Back Cover
Contents

Please read before proceeding
Installer – Read all instructions, in this
manual before installing. Perform steps
in the order given.
User – This manual is for use only
by a qualified heating installer/
service technician. Refer to the User’s
Information Manual for your reference.
Have this boiler serviced/inspected by
a qualified service technician, at least
annually.
Failure to comply with the above could
result in severe personal injury, death or
substantial property damage.
Failure to adhere to the guidelines on this
page can result in severe personal injury,
death, or substantial property damage.
When servicing boiler –
• To avoid electric shock, disconnect electrical supply
before performing maintenance.
• To avoid severe burns, allow boiler to cool before
performing maintenance.
Boiler operation –
• Do not block flow of combustion or ventilation air to
the boiler.
• Should overheating occur or gas supply fail to shut off,
do not turn off or disconnect electrical supply to
circulator. Instead, shut off the gas supply at a location
external to the appliance.
• Do not use this boiler if any part has been under water.
The possible damage to a flooded appliance can be
extensive and present numerous safety hazards. Any
appliance that has been under water must be replaced.
Boiler water –
• Thoroughly flush the system (without boiler
connected) to remove sediment. The high-efficiency
heat exchanger can be damaged by build-up or
corrosion due to sediment.
Freeze protection fluids –
• NEVER use automotive antifreeze. Use only inhibited
propylene glycol solutions, which are specifically
formulated for hydronic systems. Ethylene glycol is
toxic and can attack gaskets and seals used in hydronic
systems.
When calling or writing about the boiler
– Please have the boiler model and serial
number from the boiler rating plate.
Consider piping and installation when
determining boiler location.
Any claims for damage or shortage in
shipment must be filed immediately
against the transportation company by
the consignee.
Factory warranty (shipped with unit) does
not apply to units improperly installed or
improperly operated.
3
If the information in this manual is not
followed exactly, a fire or explosion may
result causing property damage, personal
injury or loss of life.
This appliance MUST NOT be installed in
any location where gasoline or flammable
vapors are likely to be present.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do
not use any phone in your building.
• Immediately call your gas supplier
from a near by phone. Follow the
gas supplier’s instructions.
• If you cannot reach your gas supplier,
call the fire department.
• Installation and service must be
performed by a qualified installer,
service agency, or the gas supplier.
WARNING
NOTICE
WARNING
WARNING
WARNING DO NOT install units in rooms or
environments that contain corrosive
contaminants (see Table 1A on page 10).
Failure to comply could result in severe
personal injury, death, or substantial
property damage.
Installation & Service Manual
FIRE TUBE COMBI
™

4
The Noble Combi Boiler - How it works...
1. Heat exchanger
Allows system water to flow through specially designed
coils for maximum heat transfer, while providing
protection against flue gas corrosion. The coils are
encased in a jacket that contains the combustion process.
2. Blower
The blower pulls in air and gas through the venturi (item
5). Air and gas mix inside the blower and are pushed into the
burner, where they burn inside the combustion chamber.
3. Gas valve
The gas valve senses the negative pressure created by the
blower, allowing gas to flow only if the gas valve is
powered and combustion air is flowing.
4. Venturi
The venturi controls air and gas flow into the burner.
5. Flue gas sensor (limit rated)
This sensor monitors the flue gas exit temperature. The control
module will modulate and shut down the boiler if flue gas
temperature gets too hot. This protects the flue pipe from
overheating.
6. Boiler outlet temperature sensor (limit rated)
This sensor monitors boiler outlet water temperature (system
supply). The control module will adjust boiler firing rate so the
outlet temperature is correct.
7. Boiler inlet temperature sensor
This sensor monitors return water temperature (system
return).
8. Temperature and pressure gauge (field installed, not
shown)
Monitors the outlet temperature of the boiler as well as the
system water pressure.
9. Electronic LCD display
The electronic display consists of five (5) buttons, and a liquid
crystal display. The display is used to make adjustments and
read boiler status.
10. Flue pipe adapter
Allows for the connection of the vent pipe system to the
boiler.
11. Burner (not shown)
Made with metal fiber and stainless steel construction,
the burner uses pre-mixed air and gas and provides a
wide range of firing rates.
12. Boiler water outlet
The boiler water outlet is the boiler water connection for water
leaving the boiler and entering the system.
13. DHW water outlet
The DHW water outlet is the DHW water connection for water
leaving the boiler and entering the system.
14. Boiler water inlet
The boiler water inlet is the boiler water connection for water
entering the boiler from the system.
15. DHW water inlet
The DHW water inlet is the DHW water connection for water
entering the boiler from the system.
16. Gas connection pipe
Threaded pipe connection of 1/2". This pipe should be
connected to the incoming gas supply for the purpose of
delivering gas to the boiler.
17. Boiler control module
The boiler control responds to internal and external signals
and controls the blower, gas valve, and pumps to meet the
demand.
18. Air intake adapter
Allows for the connection of the air intake pipe to
the boiler.
19. High voltage junction box
The junction box contains the connection points for the line
voltage power and all pumps.
20. Low voltage connection board
The connection board is used to connect external low voltage
devices.
21. Low voltage wiring connections
Conduit connection points for the low voltage
connection board.
22. Condensate drain connection
The condensate drain connection provides a connection
point to install a condensate drain line.
23. Front access cover
Provides access to all internal components.
24. Ignition / flame sense electrode
Used by the control module to detect the presence of burner
flame.
25. Flame inspection window
The quartz glass window provides a view of the burner
surface and flame.
26. Relief valve
Protects the heat exchanger from an over pressure condition.
The relief valve provided with the unit is set at 50 psi.
27. Line voltage wiring connections (inside junction box)
Conduit connection points for the high voltage junction box.
28. Air pressure switch
The air pressure switch detects blocked conditions.
29. Transformer
The transformer provides 24V power to the integrated control.
30. Pump with automatic air vent
Provides flow through the unit for space heating and domestic
water applications. Serves as the boiler and DHW pump.
31. Diverter valve
Diverts boiler water from the heating loop to the DHW heat
exchanger.
32. Flow switch
The flow switch detects a DHW draw, and signals the
boiler to fire.
33. DHW sensor
This sensor monitors DHW water temperature.
The control module will adjust boiler firing rate so the
DHW temperature is correct.
Installation & Service Manual
FIRE TUBE COMBI
™

10
18
2
23
26
9
DIR #2000528036
Front Outside View
29
5
1
27
DIR #2000528036 00
28
FRONT
LEFT RIGHT
BACK
21
15
14
22
12
13
16
19
DIR #2000528036 00
Side_Rear View
The Noble Combi Boiler - How it works... (continued)
5
Bottom View
Front Inside View
32
4
3
6
33 31
7
30
DIR #2000528036 00
17
20
24
25 28
Installation & Service Manual
FIRE TUBE COMBI
™

6
Ratings
Notes:
1. As an Energy Star Partner, the manufacturer has determined
that Noble Combi Boilers meet the Energy Star guidelines
for energy efficiency.
2. The ratings are based on standard test procedures prescribed
by the United States Department of Energy.
3. Net AHRI ratings are based on net installed radiation of
sufficient quantity for the requirements of the building
and nothing need be added for normal piping and pickup.
Ratings are based on a piping and pickup allowance of 1.15.
4. Noble Combi Boilers require special gas venting. Use only
the vent materials and methods specified in the Noble
Combi Boiler Installation and Service Manual.
5. Standard Noble Combi Boilers are equipped to operate from
sea level to 4,500 feet only with no adjustments. The boiler
will de-rate by 4% for each 1,000 feet above sea level up to
4,500 feet.
6. High altitude Noble Combi Boilers are equipped to operate
from 3,000 to 9,600 feet only. The boiler will not de-rate up
to 5,000 feet and will de-rate 4.45% for each 1,000 feet above
5,000 feet. The operation given in this manual remains the
same as the standard boilers. A high altitude label (as shown
in FIG. A) is also affixed to the unit.
De-rate values are based on proper combustion calibration
and CO2 ’s adjusted to the recommended levels.
For installations above 9,600 feet, please consult the factory.
Maximum allowed working pressure is located on the rating plate.
NOTICE
Combi
AHRI Rating
Model Number
Note: Change “N”
to “L” for L.P. gas
models.
Input
MBH
(Note 5)
Heating
Capacity
MBH
(Note 2, 7)
Net
AHRI
Ratings
Water,
MBH
(Note 3, 7)
AFUE
%
(Note 1, 7)
Min Max
NKC110(N,L) 11 110 102 89 95.0
NKC150(N,L) 15 150 139 121 95.0
NKC199(N,L) 20 199 185 161 95.0
7. Ratings have been confirmed by the Hydronics Institute,
Section of AHRI.
8. The manual reset high limit provided with the NKC is
listed to UL353.
Other Specifications
Boiler Water
Content Gallons
SH Water
Connections
DHW Water
Connections
Gas
Connections
Vent/Air
Size
(Note 4)
1.4 1" 3/4" 1/2" 3"
2.0 1" 3/4" 1/2" 3"
2.7 1" 3/4" 1/2" 3"
Figure A High Altitude Label Location
UNIT EQUIPPED FOR
HIGH ALTITUDE
3,000 FT. TO 9,600 FT.
ASME
H
LOW LEAD CONTENT
Installation & Service Manual
FIRE TUBE COMBI
™

The Noble Combi Boiler gas manifold
and controls met safe lighting and other
performance criteria when the boiler
underwent tests specified in ANSI Z21.13
– latest edition.
Failure to keep boiler area clear and free
of combustible materials, gasoline, and
other flammable liquids and vapors can
result in severe personal injury, death, or
substantial property damage.
Installation must comply with:
• Local, state, provincial, and national codes, laws,
regulations, and ordinances.
• National Fuel Gas Code, ANSI Z223.1 – latest edition.
• National Electrical Code.
• For Canada only: B149.1 Installation Code, CSA C22.1
Canadian Electrical Code Part 1 and any local codes.
Before locating the boiler, check:
1. Check for nearby connection to:
• System water piping
• Venting connections
• Gas supply piping
• Electrical power
2. Locate the appliance so that if water connections should
leak, water damage will not occur. When such locations
cannot be avoided, it is recommended that a suitable
drain pan, adequately drained, be installed under the
appliance. The pan must not restrict combustion air
flow. Under no circumstances is the manufacturer to be
held responsible for water damage in connection with
this appliance, or any of its components.
3. Check area around the boiler. Remove any combustible
materials, gasoline and other flammable liquids.
4. The Noble Combi Boiler must be installed so that gas
control system components are protected from dripping
or spraying water or rain during operation or service.
5. If a new boiler will replace an existing boiler, check for
and correct system problems, such as:
• System leaks causing oxygen corrosion or heat
exchanger cracks from hard water deposits.
• Incorrectly-sized expansion tank.
• Lack of freeze protection in boiler water causing system
and boiler to freeze and leak.
6. Check around the boiler for any potential air
contaminants that could risk corrosion to the boiler or
the boiler combustion air supply (see Table 1A on page
10). Prevent combustion air contamination. Remove
any of these contaminants from the boiler area.
WARNING This appliance is certified as an indoor
appliance. Do not install the appliance
outdoors or locate where the appliance will
be exposed to freezing temperatures or to
temperatures that exceed 100°F.
Failure to install the appliance indoors
could result in severe personal injury,
death, or substantial property damage.
Provide clearances:
Clearances from combustible materials
1. Hot water pipes—at least 1/4" from combustible materials.
2. Vent pipe – at least 1" from combustible materials.
3. See FIG.’s 1-1 and 1-2 on page 8 for other clearance
minimums.
Clearances for service access
1. See page 9 for recommended service clearances. If you
do not provide the minimum clearances shown, it may
not be possible to service the boiler without removing it
from the space.
Closet and alcove installations
This appliance requires a special venting
system. The vent connection to the
appliance is made of CPVC. Field supplied
vent fittings must be cemented to the CPVC
fitting on the boiler. Use only the vent
materials, primer, and cement specified in
the manual to make the vent connections.
Failure to follow this warning could result
in fire, personal injury, or death.
For closet and alcove installations as
shown in FIG.’s 1-1 and 1-2, CPVC,
polypropylene or stainless steel vent
material must be used inside the structure.
The two ventilating air openings shown in
FIG. 1-1 are required for this arrangement.
Failure to follow this warning could result
in fire, personal injury, or death.
WARNING
WARNING
NOTICE
WARNING
A closet is any room the boiler is installed in which is less
than 93 cubic feet for NKC110 models, and 102 cubic feet for
NKC150 - 199 models.
An alcove is any room which meets the criteria for a closet
with the exception that it does not have a door.
Example: Room dimensions = 4 feet long, 3 feet wide, and
7 foot ceiling = 4 x 3 x 7 = 84 cubic feet. This would be
considered a closet for a Noble Combi Boiler.
7
1 Determine boiler location
DO NOT install units in rooms or
environments that contain corrosive
contaminants (see Table 1A on page 10).
Failure to comply could result in severe
personal injury, death, or substantial
property damage.
WARNING
Installation & Service Manual
FIRE TUBE COMBI
™

LEFT
0"
MINIMUM
TOP
6"
MINIMUM
BOTTOM
0"
MINIMUM
FRONT
6"
MINIMUM
RIGHT
0" MINIMUM
1/4"MINIMUM CLEARANCE
AROUND HOT WATER PIPES
1" MINIMUM CLEARANCE
AROUND VENT PIPE
OPEN DOOR
DIR #2000534544 00
Figure 1-2 Alcove Installation - Minimum Required Clearances
LEFT
0"
MINIMUM
TOP
6"
MINIMUM
6"
6"
BOTTOM
0"
MINIMUM
FRONT
6"
MINIMUM
1/4"MINIMUM CLEARANCE
A
ROUND HOT WATER PIPES
VENTING*
OPENING
VENTING*
OPENING
1" MINIMUM CLEARANCE
AROUND VENT PIPE
DIR #2000534543 00
Figure 1-1 Closet Installation - Minimum Required Clearances
WARNING For closet installations, CPVC,
polypropylene, or stainless steel
vent material MUST BE used in
a closet structure due to elevated
temperatures. Failure to follow
this warning could result in fire,
personal injury, or death.
Note: Service clearances are recommendations only.
Note: Service clearances are recommendations only.
WARNING For alcove installations, CPVC,
polypropylene, or stainless steel
vent material MUST BE used in
an alcove structure due to elevated
temperatures. Failure to follow
this warning could result in fire,
personal injury, or death.
8
1 Determine boiler location
Minimum Clearances to Combustible
Materials
Location Clearances
From Top of the Unit 6"
From Front of the Unit 6"
From Flue or Vent Connector
in any Direction 1"
From Back of the Unit 0"
From the Left Side of the Unit 0"
From the Right Side of the Unit 0"
Type of Floor - Combustible
Installation & Service Manual
FIRE TUBE COMBI
™

Provide air openings to room:
Boiler alone in boiler room
1. No air ventilation openings into the boiler room are
needed when clearances around the Noble Combi
Boiler are at least equal to the SERVICE clearances
shown in FIG.’s 1-1 and 1-2. For spaces that do NOT
supply this clearance, provide two openings as shown
in FIG. 1-1. Each opening must provide one square
inch free area per 1,000 Btu/hr of boiler input.
Boiler in same space with other gas or oil-fired
appliances
1. Follow the National Fuel Gas Code (U.S.) or CSA
B149.1 (Canada) to size/verify size of the combustion/
ventilation air openings into the space.
The space must be provided with
combustion/ventilation air openings
correctly sized for all other appliances
located in the same space as the Noble
Combi Boiler.
Do not install the boiler in an attic.
Failure to comply with the above
warnings could result in severe personal
injury, death, or substantial property
damage.
2. Size openings only on the basis of the other appliances
in the space. No additional air opening free area is
needed for the Noble Combi Boiler because it takes its
combustion air from outside (direct vent installation).
Wall mounting location
Ensure the wall for which the boiler is intended to be
mounted is comprised of either, cement, brick, block, or
wooden studs spaced 16" apart from center. Ensure the
wall is capable of supporting at least 200 pounds.
If flooding is possible, elevate the boiler sufficiently to
prevent water from reaching the boiler.
Ensure the boiler is installed in a location that minimizes
the risk of water damage due to valves, pumps, etc.
Residential garage installation
Precautions
Take the following precautions when installing the appliance in
a residential garage. If the appliance is located in a residential
garage, it should be installed in compliance with the latest
edition of the National Fuel Gas Code, ANSI Z223.1 and/or
CAN/CGA-B149 Installation Code.
• Appliances located in residential garages and in
adjacent spaces that open to the garage and are not part
of the living space of a dwelling shall be installed so that
all burners and burner ignition devices are located not
less than 18 inches (46 cm) above the floor.
• The appliance shall be located or protected so that it is
not subject to physical damage by a moving vehicle.
Vent and air piping
The Noble Combi Boiler requires a special vent system, designed
for pressurized venting.
The boiler is to be used for either direct vent installation or for
installation using indoor combustion air. When room air is
considered, see Section 3, General Venting. Note prevention of
combustion air contamination below when considering vent/
air termination.
Vent and air must terminate near one another and may be
vented vertically through the roof or out a side wall, unless
otherwise specified. You may use any of the vent/air piping
methods covered in this manual. Do not attempt to install the
Noble Combi Boiler using any other means.
Be sure to locate the boiler such that the vent and air piping can
be routed through the building and properly terminated. The
vent/air piping lengths, routing and termination method must
all comply with the methods and limits given in this manual.
Prevent combustion air contamination
Install air inlet piping for the Noble Combi Boiler as described
in this manual. Do not terminate vent/air in locations that can
allow contamination of combustion air. Refer to Table 1A,
page 10 for products and areas which may cause contaminated
combustion air.
You must pipe combustion air to the boiler
air intake. Ensure that the combustion air will
not contain any of the contaminants in Table
1A, page 10. Contaminated combustion air
will damage the boiler, resulting in possible
severe personal injury, death or substantial
property damage. Do not pipe combustion
air near a swimming pool, for example.
Also, avoid areas subject to exhaust fumes
from laundry facilities. These areas will
always contain contaminants.
WARNING
WARNING
1 Determine boiler location (continued)
9
Installation & Service Manual
Recommended clearances for service access
- Front ............................................................................. 24"
- Left ................................................................................ 12"
- Right ............................................................................. 12"
- Bottom.......................................................................... 24"
If you do not provide the recommended
service clearances shown, it may not be
possible to service the boiler without
removing it from the space.
NOTICE
FIRE TUBE COMBI
™

Failure to follow all instructions can result
in flue gas spillage and carbon monoxide
emissions, causing severe personal injury
or death.
WARNING
When using an existing vent system to
install a new boiler:
Check the following venting components before installing:
• Material - For materials listed for use with this appliance,
see Section 3 - General Venting.
• Size - To ensure proper pipe size is in place, see Table 3A.
Check to see that this size is used throughout the vent
system.
• Manufacturer - For a polypropylene or stainless steel
application, you must use only the listed manufacturers
and their type product listed in Tables 3D and 3F for CAT
IV positive pressure venting with flue producing
condensate.
• Supports - Non-combustible supports must be in place
allowing a minimum 1/4" rise per foot. The supports
should adequately prevent sagging and vertical slippage,
by distributing the vent system weight. For additional
information, consult the vent manufacturer’s
instructions for installation.
• Terminations - Carefully review Sections 3 through 5 to
ensure requirements for the location of the vent and air
terminations are met and orientation of these fit the
appropriate image from the Sidewall or Vertical
options listed in the General Venting Section. For
stainless steel vent, only use terminations listed in Table
3B for the manufacturer of the installed vent.
• Seal - With prior requirements met, the system should be
tested to the procedure listed in parts (c) through (f) of
the Removal of an Existing Boiler Section on page 11.
With polypropylene and stainless steel vent, seal and connect
all pipe and components as specified by the vent manufacturer
used; with PVC/CPVC vent, see the Installing Vent or Air
Piping Section on page 18.
WARNING If any of these conditions are not met,
the existing system must be updated or
replaced for that concern. Failure to
follow all instructions can result in flue gas
spillage and carbon monoxide emissions,
causing severe personal injury or death.
10
1 Determine boiler location
Products to avoid:
Spray cans containing chloro/fluorocarbons
Permanent wave solutions
Chlorinated waxes/cleaners
Chlorine-based swimming pool chemicals
Calcium chloride used for thawing
Sodium chloride used for water softening
Refrigerant leaks
Paint or varnish removers
Hydrochloric acid/muriatic acid
Cements and glues
Antistatic fabric softeners used in clothes dryers
Chlorine-type bleaches, detergents, and cleaning solvents
found in household laundry rooms
Adhesives used to fasten building products and other
similar products
Areas likely to have contaminants
Dry cleaning/laundry areas and establishments
Swimming pools
Metal fabrication plants
Beauty shops
Refrigeration repair shops
Photo processing plants
Auto body shops
Plastic manufacturing plants
Furniture refinishing areas and establishments
New building construction
Remodeling areas
Garages with workshops
Table 1A Corrosive Contaminants and Sources
Installation & Service Manual
FIRE TUBE COMBI
™

When removing a boiler from existing common vent system:
Do not install the Noble Combi Boiler into
a common vent with any other appliance.
This will cause flue gas spillage or appliance
malfunction, resulting in possible severe
personal injury, death, or substantial
property damage.
Failure to follow all instructions can result
in flue gas spillage and carbon monoxide
emissions, causing severe personal injury
or death.
At the time of removal of an existing boiler, the following steps
shall be followed with each appliance remaining connected
to the common venting system placed in operation, while the
other appliances remaining connected to the common venting
system are not in operation.
a. Seal any unused openings in the common venting system.
b. Visually inspect the venting system for proper size and
horizontal pitch and determine there is no blockage or
restriction, leakage, corrosion, or other deficiencies, which
could cause an unsafe condition.
c. Test vent system – Insofar as is practical, close all building
doors and windows and all doors between the space in
which the appliances remaining connected to the common
venting system are located and other spaces of the building.
Turn on clothes dryers and any appliance not connected
to the common venting system. Turn on any exhaust fans,
such as range hoods and bathroom exhausts, so they will
operate at maximum speed. Do not operate a summer
exhaust fan. Close fireplace dampers.
d. Place in operation the appliance being inspected. Follow
the lighting instructions. Adjust thermostat so appliance
will operate continuously.
e. Test for spillage at the draft hood relief opening after
5 minutes of main burner operation. Use the flame of a
match or candle, or smoke from a cigarette, cigar, or pipe.
f. After it has been determined that each appliance remaining
connected to the common venting system properly vents
when tested as outlined herein, return doors, windows,
exhaust fans, fireplace dampers, and any other gas-burning
appliance to their previous conditions of use.
DANGER
WARNING
g. Any improper operation of the common venting system
should be corrected so the installation conforms with
the National Fuel Gas Code, ANSI Z223.1/NFPA 54
and/or CAN/CSA B149.1, Natural Gas and Propane
Installation Code. When resizing any portion of the
common venting system, the common venting system
should be resized to approach the minimum size as
determined using the appropriate tables in Part 11
of the National Fuel Gas Code, ANSI Z223.1/NFPA
and/or CAN/CSA B149.1, Natural Gas and Propane
Installation Code.
11
1 Determine boiler location (continued)
Installation & Service Manual
FIRE TUBE COMBI
™

2 Prepare boiler
12
Remove boiler from wood pallet
1. After removing the outer shipping carton from the
boiler, remove the parts box.
2. To remove the boiler from the pallet:
a. Remove the two (2) lag bolts securing the
bottom of the unit to the pallet.
b. Lift the boiler off the wall bracket mounted to
the pallet (FIG. 2-1).
REMOVE SHIPPING
(WALL) BRACKET
DO NOT DISCARD.
WILL BE NEEDED TO
SECURE THE BOILER
TO THE WALL.
DIR #2000528206 00
Figure 2-1 Boiler Mounted on Shipping Pallet
CAUTION Do not attempt to use the water pipe
fittings or gas pipe to lift the boiler.
For a boiler already installed, you must
turn off gas supply, turn off power and
allow boiler to cool before proceeding.
You must also completely test the boiler
after conversion to verify performance as
described under Start-up, Section 10 of
this manual.
Failure to comply could result in severe
personal injury, death, or substantial
property damage.
Gas conversions
WARNING
You must install a propane venturi to operate the Noble
Combi Boiler on propane gas. Verify when installing that the
venturi label marking matches the boiler size (see Table 2A).
1. If boiler is already installed, you must turn off the gas
supply, turn off the power, and allow the boiler to cool
before proceeding.
2. Remove the front access cover from the unit (no tools
required for removal).
3. Using a 5/16" nut driver, loosen the rachet clamp securing
the air intake fitting to the venturi assembly. Slide the
rubber boot off the venturi.
4. Using an adjustable wrench, loosen the union between the
gas valve adapter and the venturi assembly. Remove the
gasket between the gas piping and venturi (FIG. 2-2).
5. Using a 3 mm Allen wrench, remove the three (3) screws
securing the venturi to the fan assembly and proceed to
remove the natural gas venturi from the unit, making sure
not to damage the blower O-ring gasket (FIG. 2-2).
6. Install the air shutter (reference Table 2A for the model
specific air shutter to be installed).
a. Disconnect the wiring from the fan and remove the
bolts securing the fan to the heat exchanger top plate.
b. Remove the fan and gasket, and install the air shutter
provided in the kit. Note: On NKC110 models, the air
shutter MUST be installed in the proper direction.
Install the air shutter so that the hole in the corner is
oriented towards the back right corner of the unit
(opposite the front door and gas piping).
c. Replace all torn or damaged gaskets. Reassemble the
fan assembly and reconnect the wiring harnesses
before operation.
7. Install the propane venturi and verify the following:
a. The UP arrow on the plastic housing is pointing
upward.
b. The threaded connection for the gas piping is facing
towards the LEFT of the unit.
8. Reassemble the unit by following the previous steps in
revers order, taking care to ensure that the venturi adapter
gasket is seated properly before tightening the nut on the
venturi. NOTE: Replace any torn or damaged gasket(s) that
may have been damaged or torn during installation.
9. After installation is complete, fill out the gas conversion
label (in the conversion kit bag) and affix it to the unit to the
right of the control display as shown in FIG. 2-3.
10. Replace the front access cover removed in Step 2 and
resume operation.
Do not drop the boiler. Damage to the
boiler can result.
NOTICE
3. Remove the two (2) lag bolts securing the wall bracket to the
wood pallet. Be certain not to lose the wall bracket as it will
be needed for securing the boiler to the wall (FIG. 2-4).
Installation & Service Manual
Table 2A LP Conversion Table
Model Kit # Venturi Ø
(mm)
Orifice Ø Air
Shutter
Bottom Top
110 100275546 20 mm 2.45 mm 2.55 mm 100275611
150 100275548 24 mm 3.20 mm 2.95 mm 100275613
199 100275549 22 mm 3.30 mm 3.10 mm 100275615
DANGER When removing the natural gas venturi,
inspect the gasket at the gas connection
and the O-ring at the blower. These
gaskets must be in good condition and
must be installed. Failure to comply
will cause a gas leak, resulting in severe
personal injury or death.
Do not attempt to lift the boiler using the
gas pipe as a handle.
CAUTION
FIRE TUBE COMBI
™

2 Prepare boiler (continued)
FASTENERS
APPROPRIATE
FOR WALL TYPE
QTY: 4
WALL:
WOOD OR METAL STUDS
ON 16" CENTERS -OR-
MASONRY / POURED CONCRETE
MOUNTING BRACKET
(FACTORY SUPPLIED)
DIR #2000528235 00
Figure 2-4 Mounting the boiler
Mounting to a metal studded wall:
1. The wall mount bracket is designed for a stud spacing of 16
inches from center (FIG. 2-4). For other stud spacing a
solid mounting surface must be provided by the installer.
2. Mount the wall bracket using two (2) field supplied toggle
bolts capable of supporting 100 pounds each. Ensure the
top edge of the bracket is away from the wall. Ensure the
bracket is level when mounted. Extreme care is needed to
ensure the bolts are secured in the center of the studs.
3. Hang the boiler on the bracket and secure the bottom of the
boiler with two (2) field supplied toggle bolts.
WARNING Do not mount the boiler to a hollow wall. Be
sure to mount the boiler to the studs only.
Mounting the boiler
See page 9 of this manual for boiler mounting location
instructions.
NOTICE The Noble Combi Boiler is not intended
for floor installation.
Mounting to a wood studded wall:
1. The wall mount bracket is designed for a stud spacing of
16 inches from center (FIG. 2-4). For other stud spacing
a solid mounting surface must be provided by the
installer.
WARNING Do not mount the boiler to a hollow wall.
Be sure to mount the boiler to the studs
only.
Mounting to a concrete wall:
1. Mount the wall bracket using the two (2) wedge anchor
bolts provided with the bracket (FIG. 2-4). To mount the
wedge anchor bolts, drill a 1/4" diameter hole 1 1/8" deep
and insert anchor. Hang the bracket from the anchor and
secure with the two nuts provided. Make sure the top edge
of the bracket is away from the wall. Ensure bracket is level
when mounted.
Note: If wall thickness does not allow a 1 1/8" deep hole,
field supplied hardware suitable for the application should be
provided.
2. Hang the boiler on the bracket and secure the bottom of the
boiler with two (2) remaining anchors, following the
instructions above.
WARNING The boiler is too heavy for a single person
to lift. A minimum of two people is
needed for mounting the boiler onto the
bracket.
13
2. Mount the wall bracket using the 2 1/4" lag bolts
provided. Make sure the top edge of the bracket is away
from the wall. Ensure the bracket is level when mounted.
Extreme care is needed to ensure the bolts are secured in
the center of the studs.
3. Hang the boiler on the bracket and secure the bottom of
the boiler with two (2) additional lag bolts provided.
DIR #2000534767 00
NATURAL GAS
VENTURI
DISCONNECT
GAS PIPING
AIR SHUTTER
Figure 2-2 Remove Natural Gas Venturi
WARNING After converting to LP, check combustion
per the Start-up procedure in Section 10
of this manual. Failure to check and
verify combustion could result in severe
personal injury, death, or substantial
property damage.
DIR #2000536093 00
GAS CONVERSION LABEL
(AFFIX TO UNIT AS SHOWN)
Figure 2-3 Gas Conversion Label Location
Installation & Service Manual
FIRE TUBE COMBI
™

3 General venting
DIR #2000534593 00
DIR #2000534592 00
Figure 3-1 Two-Pipe Sidewall Termination - See
page 22 for more details
Figure 3-2 PVC/CPVC Concentric Sidewall
Termination - See page 25 for more details
Direct venting options - Sidewall Vent
DIR #2000534588 00
DIR #2000534587 00
Figure 3-3 Two-Pipe Vertical
Termination - See page 28 for more
details
Figure 3-5 Vertical Vent, Sidewall
Air
Figure 3-4 PVC/CPVC Concentric
Vertical Termination - See page 30
for more details
DIR #2000534590 00
14
Direct venting options - Vertical Vent
Installation & Service Manual
FIRE TUBE COMBI
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15
3 General venting (continued)
This appliance requires a special venting
system. Use only approved PVC, CPVC,
polypropylene or stainless steel pipe and
fittings listed in Tables 3C, 3D, and 3F for
vent pipe, and fittings. Failure to comply
could result in severe personal injury,
death, or substantial property damage.
Installation must comply with local
requirements and with the National
Fuel Gas Code, ANSI Z223.1 for U.S.
installations or CSA B149.1 for Canadian
installations.
Install vent and combustion air piping
DANGER The Noble Combi Boiler must be vented and
supplied with combustion and ventilation
air as described in this section. Ensure the
vent and air piping and the combustion
air supply comply with these instructions
regarding vent system, air system, and
combustion air quality. See also Section 1
of this manual.
Inspect finished vent and air piping
thoroughly to ensure all are airtight and
comply with the instructions provided and
with all requirements of applicable codes.
Failure to provide a properly installed vent
and air system will cause severe personal
injury or death.
WARNING
NOTICE
WARNING For closet and alcove installations, CPVC,
polypropylene or stainless steel material
MUST BE used in a closet/alcove structure.
Failure to follow this warning could result
in fire, personal injury, or death.
Air intake/vent connections
1. Combustion Air Intake Connector (FIG. 3-6)
- Used to provide combustion air directly to the unit from
outdoors. A fitting is provided on the unit for final
connection. Combustion air piping must be supported
per guidelines listed in the National Mechanical Code,
Section 305, Table 305.4 or as local codes dictate.
2. Vent Connector (FIG.'s 3-6 thru 3-10) - Used to provide a
passageway for conveying combustion gases to the
outside. A transition fitting is provided on the unit for
final connection. Vent piping must be supported per the
National Building Code, Section 305, Table 305.4 or as
local codes dictate.
The Noble Combi Boiler vent and air piping can be installed
through the roof or through a sidewall. Follow the procedures
in this manual for the method chosen. Refer to the information
in this manual to determine acceptable vent and air piping
length.
You may use any of the vent/air piping methods covered in
this manual. Do not attempt to install the Noble Combi Boiler
using any other means.
You must also install air piping from outside to the boiler
air intake adapter unless following the Optional Room Air
instructions on page 17 of this manual. The resultant
installation is direct vent (sealed combustion) .
WARNING DO NOT mix components from different
systems. The vent system could fail,
causing leakage of flue products into the
living space. Mixing of venting materials
will void the warranty and certification of
the appliance.
WARNING Do not connect any other appliance to the
vent pipe or multiple boilers to a common
vent pipe. Failure to comply could result in
severe personal injury, death, or substantial
property damage.
Improper installation of venting systems
may result in injury or death.
CAUTION
Follow the instructions in Section 1, page
11 of this manual when removing a boiler
from an existing vent system.
NOTICE
DIR #2000528317 00
AIR
Figure 3-6 Near Boiler Air Piping
Installation & Service Manual
FIRE TUBE COMBI
™

3 General venting
16
Minimum/Maximumallowablecombustion
air and vent piping lengths are as follows:
Combustion Air = 7 equivalent feet minimum / 100 equivalent
feet maximum
Vent = 7 equivalent feet minimum / 100 equivalent feet
maximum
When determining equivalent combustion air and vent length,
add 5 feet for each 90° elbow and 3 feet for each 45° elbow.
EXAMPLE: 20 feet of PVC pipe + (4) 90° elbows + (2) 45°
elbows + (1) concentric vent kit (100140480) = 49 equivalent
feet of piping.
The appliance output rating will reduce by
up to 1.5% for each 25 feet of vent length.
NOTICE
Model Kit
Number
Equivalent Vent
Length
Vent
Size
110 - 150 100140485 3 feet 2 inch
110 - 199 100140480 3 feet 3 inch
Table 3B Concentric Vent Kit Equivalent Vent Lengths
Sizing
The Noble Combi Boiler uses model specific combustion air
intake and vent piping sizes as detailed in Table 3A below.
Table 3A Air Intake/Vent Piping Sizes
Increasing or decreasing combustion air
or vent piping sizes is not authorized.
NOTICE
Model 2" Max Vent/Air 3" Max Vent/Air
110 100 feet 100 feet
150 60 feet 100 feet
199 N/A 100 feet
Installation & Service Manual
Materials
Air inlet pipe materials:
The air inlet pipe(s) must be sealed. Choose acceptable
combustion air inlet pipe materials from the following list:
PVC, CPVC, Polypropylene or ABS
Galvanized steel vent pipe with joints and seams sealed as
specified in this section.
Type “B” double-wall vent with joints and seams sealed as
specified in this section.
AL29-4C, stainless steel material to be sealed to
specification of its manufacturer.
*Plastic pipe may require an adapter (not provided) to
transition between the air inlet connection on the appliance
and the plastic air inlet pipe.
WARNING Using air intake materials other than those
specified can result in personal injury,
death or property damage.
NOTICE The use of double-wall vent or insulated
material for the combustion air inlet pipe is
recommended in cold climates to prevent
the condensation of airborne moisture in
the incoming combustion air.
Sealing of Type “B” double-wall vent material or galvanized
vent pipe material used for air inlet piping on a sidewall or
vertical rooftop Combustion Air Supply System:
a. Seal all joints and seams of the air inlet pipe using either
Aluminum Foil Duct Tape meeting UL Standard 723 or
181A-P or a high quality UL Listed silicone sealant such as
those manufactured by Dow Corning or General Electric.
b. Do not install seams of vent pipe on the bottom of
horizontal runs.
c. Secure all joints with a minimum of three (3) sheet metal
screws or pop rivets. Apply Aluminum Foil Duct Tape or
silicone sealant to all screws or rivets installed in the vent
pipe.
d. Ensure that the air inlet pipes are properly supported.
The PVC, CPVC, or ABS air inlet pipe should be cleaned and
sealed with the pipe manufacturer’s recommended solvents
and standard commercial pipe cement for the material used.
The PVC, CPVC, ABS, or Flex Duct air inlet pipe should
use a silicone sealant to ensure a proper seal at the appliance
connection and the air inlet cap connection. Dryer vent or
flex duct should use a screw type clamp to seal the vent to
the appliance air inlet and the air inlet cap. Proper sealing of
the air inlet pipe ensures that combustion air will be free of
contaminants and supplied in proper volume.
When a sidewall or vertical rooftop combustion air supply
system is disconnected for any reason, the air inlet pipe
must be resealed to ensure that combustion air will be free of
contaminants and supplied in proper volume.
DANGER Failure to properly seal all joints and seams
as required in the air inlet piping may
result in flue gas recirculation, spillage
of flue products and carbon monoxide
emissions causing severe personal injury
or death.
FIRE TUBE COMBI
™

Air contamination
Pool and laundry products and common household and hobby
products often contain fluorine or chlorine compounds.
When these chemicals pass through the boiler, they can form
strong acids. The acid can eat through the boiler wall, causing
serious damage and presenting a possible threat of flue gas
spillage or boiler water leakage into the building.
If the boiler combustion air inlet is located
in a laundry room or pool facility, for
example, these areas will always contain
hazardous contaminants.
To prevent the potential of severe personal
injury or death, check for areas and products
listed in Table 1A, page 10 before installing
the boiler or air inlet piping.
If contaminants are found, you MUST:
• Remove contaminants permanently.
—OR—
• Relocate air inlet and vent
terminations to other areas.
WARNING
WARNING
Optional room air
Commercial applications utilizing the Noble Combi Boiler
may be installed with a single pipe carrying the flue products
to the outside while using combustion air from the equipment
room. In order to use the room air venting option the
following conditions and considerations must be followed.
• The unit MUST be installed with the appropriate
room air kit (Table 3C).
• The equipment room MUST be provided with
properly sized openings to assure adequate
combustion air. Please refer to instructions provided
with the room air kit.
• There will be a noticeable increase in the noise level
during normal operation from the inlet air opening.
• Using the room air kit makes the unit vulnerable to
combustion air contamination from within the
building. Please review Section 1, Prevent
Combustion Air Contamination, to ensure proper
installation.
• Vent system and terminations must comply with the
standard venting instructions set forth in this
manual.
WARNING When utilizing the single pipe method,
provisions for combustion and ventilation
air must be in accordance with Air for
Combustion and Ventilation, of the
latest edition of the National Fuel Gas
Code, ANSI Z223.1, in Canada, the latest
edition of CGA Standard B149 Installation
Code for Gas Burning Appliances and
Equipment, or applicable provisions of the
local building codes.
Model Kit Number Air Size
110 - 150 100157614 2"
110 - 199 100157615 3"
Table 3C Optional Room Air Kit
NOTICE Optional room air is intended for
commercial applications. Combustion air
piping to the outside is recommended for
residential applications.
Please read the information given in Table 1A, page 10,
listing contaminants and areas likely to contain them. If
contaminating chemicals will be present near the location of the
boiler combustion air inlet, have your installer pipe the boiler
combustion air and vent to another location, per this manual.
17
3 General venting (continued)
Installation & Service Manual
FIRE TUBE COMBI
™

18
3 General venting
PVC/CPVC:
DIR #2000528318 00
VENT
AIR
Figure 3-7 Near Boiler PVC/CPVC Venting
When transitioning from 2" to 3" vent diameter,
a 2" pipe section and 2" to 3" increaser are
required to be CPVC when PVC/CPVC vent
is used.
WARNING
Examples: 1. Seven (7) feet vertical
2. Connector + 90° elbow + 2 feet horizontal
3. One (1) foot vertical + 90° elbow + 1 foot
horizontal
Installing vent and air piping
Use only cleaners, primers, and solvents that
are approved for the materials which are joined
together.
NOTICE
1. Work from the boiler to vent or air termination. Do not
exceedthe lengthsgivenin thismanual fortheair orvent
piping.
2. Cut pipe to the required lengths and deburr the inside
and outside of the pipe ends.
3. Chamfer outside of each pipe end to ensure even
cement distribution when joining.
4. Clean all pipe ends and fittings using a clean dry rag.
(Moisture will retard curing and dirt or grease will
prevent adhesion.)
5. Dry fit vent or air piping to ensure proper fit up before
assembling any joint. The pipe should go a third to
two-thirds into the fitting to ensure proper sealing after
cement is applied.
6. Priming and Cementing:
a. Handle fittings and pipes carefully to prevent
contamination of surfaces.
b. Apply a liberal even coat of primer to the fitting
socket and to the pipe end to approximately 1/2"
beyond the socket depth.
c. Apply a second primer coat to the fitting socket.
d. While primer is still wet, apply an even coat of
approved cement to the pipe equal to the depth of
the fitting socket along with an even coat of
approved cement to the fitting socket.
e. Apply a second coat of cement to the pipe.
f. While the cement is still wet, insert the pipe into
the fitting, if possible twist the pipe a 1/4 turn as
you insert it. NOTE: If voids are present,
sufficient cement was not applied and joint could
be defective.
g. Wipe excess cement from the joint removing ring
or beads as it will needlessly soften the pipe.
Table 3D PVC/CPVC Vent Pipe, and Fittings
All PVC vent pipes must be glued, properly
supported, and the exhaust must be pitched
a minimum of a 1/4 inch per foot back to the
boiler (to allow drainage of condensate).
NOTICE
WARNING The flue pipe adapter acts as the CPVC starter
pipe section provided with the appliance if
PVC/CPVC vent is to be used (FIG. 3-7). The
field provided vent fittings must be cemented to
the CPVC pipe section using an “All Purpose
Cement” suitable for PVC and CPVC pipe.
Use only the vent materials, primer, and
cement specified in Table 3D to make the vent
connections. Failure to follow this warning
could result in fire, personal injury, or death.
WARNING Insulation should not be used on PVC or CPVC
venting materials. The use of insulation will
cause increased vent wall temperatures, which
could result in vent pipe failure.
Approved PVC/CPVC Vent Pipe and Fittings
Item Material Standard
Vent pipe
PVC Schedule 40, 80 ANSI/ASTM D1785
PVC - DWV ANSI/ASTM D2665
CPVC Schedule 40, 80 ANSI/ASTM F441
Vent fittings
PVC Schedule 40 ANSI/ASTM D2466
PVC Schedule 80 ANSI/ASTM D2467
CPVC Schedule 80 ANSI/ASTM F439
Pipe Cement /
Primer
PVC ANSI/ASTM D2564
CPVC ANSI/ASTM F493
NOTICE: DO NOT USE CELLULAR (FOAM) CORE PIPE
This product has been approved for use with the PVC/CPVC
vent materials listed in Table 3D.
NOTE: In Canada, CPVC and PVC vent pipe, ttings and cement/
primer must be ULC-S636 certied.
For installations using 2" vent, the first seven
(7) equivalent feet of vent must be CPVC (field
supplied). See examples below.
WARNING
Installation & Service Manual
FIRE TUBE COMBI
™

19
The installer must use a specific vent
starter adapter at the flue collar connection,
supplied by the vent manufacturer to
adapt to its vent system. See Table 3F for
approved vent adapters. Discard CPVC
starter piece.
NOTICE
DIR #2000528329 00
JOINT CONNECTOR REQUIRED
AT ALL COMPONENT CONNECTIONS
OF VENT SYSTEM
Model
Centrotherm InnoFlue SW Duravent Polypro
Polypropylene Adapter/
Flue Clamp Joint Connector Sidewall Retaining Bracket* Sidewall Adapter* Polypropylene Adapter Joint Connector Sidewall Kit
110 - 199 ISAG0303 w/IAFC03 IANS03 IATP0303 ISTAGL0303 3PPS-AD 3PPS-LB 3PPS-HLK
* These parts are only needed if the alternate sidewall termination assembly is used.
Table 3F Approved Polypropylene Terminations and Adapters
Polypropylene:
This product has been approved for use with polypropylene
vent with the manufacturers listed in Table 3E.
All terminations must comply with listed options in this
manual and be a single-wall vent offering.
For support and special connections required, see the
manufacturer's instructions. All vent is to conform to standard
diameter and equivalent length requirements established.
When determining equivalent combustion air and vent length
for polypropylene single-wall piping:
• 1 foot of Duravent 4 inch single-wall pipe is equivalent
to 1.6 feet of piping
Flexible polypropylene
For use of flex pipe, it is recommended to have the vent material
in 32°F or higher ambient space before bending at installation.
No bends should be made to greater than 45° and ONLY
installed in vertical or near vertical installations (FIG. 3-8).
Use only the adapters and vent system listed
in Tables 3E and 3F. DO NOT mix vent
systems of different types or manufacturers,
unless listed in this manual. Failure to
comply could result in severe personal injury,
death, or substantial property damage.
WARNING
Installations must comply with applicable
national, state, and local codes. For
Canadian installation, polypropylene vent
must be listed as a ULC-S636 approved
system.
Installation of a polypropylene vent system
should adhere to the vent manufacturer’s
installation instructions supplied with the
vent system.
Table 3E Polypropylene Vent Pipe and Fittings
3 General venting (continued)
Approved Polypropylene Vent Manufacturers
Make Model
Centrotherm Eco Systems InnoFlue SW/Flex
Duravent (M & G Group) PolyPro Single-Wall / PolyPro Flex
All vent connections MUST be secured by
the vent manufacturer's joint connector
(FIG. 3-9).
NOTICE
WARNING Insulation should not be used on
polypropylene venting materials. The use
of insulation will cause increased vent wall
temperatures, which could result in vent
pipe failure.
IMG00840
*NOTES: 1) FLEX PIPE MAY ONLY BE RUN IN A VERTICAL ORIENTATION
2) ALL VENT LENGTHS REPRESENTED IN ABOVE CHARTS ARE
EQUIVALENT LENGTHS.
3) SECTION A IS EQUIVALENT FEET OF RIGID PIPE, WHICH MAY
INCLUDE 45 AND 90° ELBOWS. PLEASE SEE SIZING SECTION
FOR DETERMINING EQUIVALENT FEET.
“B” DIM
3” RIGID 3” FLEX 4” FLEX
Duravent 3”
10 FT
20 FT
30 FT
40 FT
50 FT
60 FT
70 FT
80 FT
90 FT
60 FT
53 FT
47 FT
40 FT
33 FT
27 FT
20 FT
13 FT
7 FT
90 FT
80 FT
70 FT
60 FT
50 FT
40 FT
30 FT
20 FT
10 FT
10 FT
20 FT
30 FT
40 FT
50 FT
60 FT
70 FT
80 FT
90 FT
30 FT
27 FT
23 FT
20 FT
17 FT
13 FT
10 FT
7 FT
3 FT
“A” DIM “B” DIM
Duravent 4”
“A” DIM
4” RIGID 4” FLEX
“B” DIM
3” RIGID 3” FLEX 4” FLEX
Centrotherm 3”
10 FT
20 FT
30 FT
40 FT
50 FT
60 FT
70 FT
80 FT
90 FT
45 FT
40 FT
35 FT
30 FT
25 FT
20 FT
15 FT
10 FT
5 FT
90 FT
80 FT
70 FT
60 FT
50 FT
40 FT
30 FT
20 FT
10 FT
“A” DIM
10 FT
20 FT
30 FT
40 FT
50 FT
60 FT
70 FT
80 FT
90 FT
33 FT
29 FT
26 FT
22 FT
18 FT
15 FT
11 FT
7 FT
4 FT
“B” DIM
Centrotherm 4”
“A” DIM
4” RIGID 4” FLEX
CHIMNEY
CAP
A
B
90 FT
80 FT
70 FT
60 FT
50 FT
40 FT
30 FT
20 FT
10 FT
5” FLEX
Figure 3-8 Near Boiler Flexible Polypropylene Venting
NOTICE
NOTICE
Figure 3-9 Near Boiler Polypropylene Venting Model 199
Installation & Service Manual
FIRE TUBE COMBI
™

20
The installer must use a specific vent
starter adapter at the flue collar connection,
supplied by the vent manufacturer to
adapt to its vent system. See Table 3H for
approved vent adapters. Discard CPVC
starter piece.
NOTICE
Table 3G Stainless Steel Vent Pipe and Fittings
*Use of FasNSeal Flex smooth inner wall vent is to be used in vertical or near vertical sections only, taking precaution to ensure
no sagging occurs of the vent system. Connect to the FasNSeal rigid vent using specially designed adapters and sealing method,
see manufacturer’s instructions.
Stainless steel vent:
This product has been approved for use with stainless steel
using the manufacturers listed in Table 3G.
Use only the materials, vent systems, and
terminations listed in Tables 3G and 3H.
DO NOT mix vent systems of different
types or manufacturers. Failure to comply
could result in severe personal injury,
death, or substantial property damage.
WARNING
Installations must comply with applicable
national, state, and local codes. Stainless
steel vent systems must be listed as a
UL-1738 approved system for the United
States and a ULC-S636 approved system
for Canada.
NOTICE
Installation of a stainless steel vent system
should adhere to the stainless steel vent
manufacturer’s installation instructions
supplied with the vent system.
NOTICE
3 General venting
DIR #2000528338 00
VENT
UNIVERSAL ADAPTER
(FACTORY SUPPLIED)
Figure 3-10 Near Boiler Stainless Steel Venting
Table 3H Approved Stainless Steel Terminations and Adapters
Model
ProTech Heat Fab Z Flex
FasNSeal Saf-T Vent Z-Vent
**Boiler
Adapter Flue Termination
Intake
Air
Termination
*Boiler
Adapter Flue Termination
Intake
Air
Termination
**Boiler
Adapter Flue Termination Intake Air Termination
110 - 199 300715
(Intake Air) FSBS3 FSRC3(R.C) 303889 -- 9392 5300CI 9314TERM -- 2SVSTP03 2SVSRCX03 2SVSTEX0390
*The stainless steel venting option is only available in 3" vent diameters.
Approved Stainless Steel Vent Manufacturers
Make Model
Dura Vent (M & G Group) FasNSeal Vent / FasNSeal Flex* Vent
Z-Flex (Nova Flex Group) Z-Vent
Heat Fab (Selkirk Corporation) Saf-T Vent
Installation & Service Manual
FIRE TUBE COMBI
™