V-max VM110 User manual

Vmax Boiler
Model Number: VM110, VM110P
Version Date: 2014-12-04
INSTALLATION AND OPERATION INSTRUCTIONS FOR
Vmax BOILER
TABLE OF CONTENTS
1.0 INTRODUCTION................................................................................................................3
2.0 SPECIFICATIONS ..............................................................................................................6
3.0 BOILER LOCATION ..........................................................................................................7
4.0 GENERAL VENTING.......................................................................................................10
5.0 VENT/AIR-INLET TERMINATION CLEARANCES.....................................................24
6.0 CONDENSATE DRAIN....................................................................................................27
7.0 INSTALLING GAS PIPING..............................................................................................29
8.0 LIGHTING THE BOILER.................................................................................................31
9.0 GAS VALVE AND BURNER SET-UP ............................................................................34
10.0 BOILER AND HEATING SYSTEM PIPING...................................................................37
11.0 DOMESTIC HOT WATER (DHW) PIPING ....................................................................48
12.0 FIELD WIRING.................................................................................................................51
13.0 CASCADE INSTRUCTIONS............................................................................................54
14.0 WIRING SCHEMATICS...................................................................................................56
15.0 INSTALLATION CHECKLIST........................................................................................58
16.0 ANNUAL MAINTENANCE AND INSPECTION...........................................................59
17.0 DISPLAY MENU GUIDE.................................................................................................61
18.0 TROUBLESHOOTING .....................................................................................................73
19.0 PARTS LIST ......................................................................................................................76
HAZARD SYMBOLS AND DEFINITIONS
Danger Sign: Indicates a hazardous situation which, if not avoided, will
result in serious injury or death.
Warning Sign: Indicates a hazardous situation which, if not avoided,
could result in serious injury or death.
Caution Sign plus Safety Alert Symbol: Indicates a hazardous situation
which, if not avoided, could result in minor or moderate injury.
Caution Sign without Safety Alert Symbol: Indicates a hazardous
situation which, if not avoided, could result in property damage.
Notice Sign: Indicates a hazardous situation which, if not avoided,
could result in property damage.
This Boiler must be installed by a licensed and trained Heating
Technician or the Warranty is Void. Failure to properly install this
unit may result in property damage, serious injury to occupants, or possibly death.
NTI # 85171
NEW PRODUCT
Fire-tube Boiler
w/ Built-in Pump
H

Warnings │Vmax I&O Manual
2
Read Before Proceeding
If you do not follow these instructions exactly, a fire or explosion may result causing
property damage, serious injury or death.
FOR YOUR SAFETY, READ BEFORE OPERATING_
A) This boiler does not have a pilot. It is equipped with an ignition device which automatically lights the
burner. Do not try to light the burner by hand.
B) BEFORE OPERATING smell all around the boiler area for gas. Be sure to smell next to the floor
because some gas is heavier than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS:
•Do not try to light any boiler.
•Do not touch any electric switch.
•Do not use any phone in your building.
•Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions.
•If you cannot reach your gas supplier, call the fire department.
C) Use only your hand to turn the gas “shutoff” valve. Never use tools. If the handle will not turn by hand,
do not try to repair it, call a qualified service technician. Force or attempted repair may result in a fire or
explosion.
D) Do not use this boiler if any part has been under water. Immediately call a qualified service technician
to inspect the boiler and to replace any part of the control system and any gas control which has been
under water.
OPERATING INSTRUCTIONS_
1. STOP! Read the safety information above very carefully.
2. Set the thermostat to lowest setting. Turn off all electric power to the boiler.
3. This boiler does not have a pilot. It is equipped with an ignition device which automatically lights the
burner. Do not try to light the burner by hand.
4. Turn the manual gas valve to the OFF position. Remove front access panel.
5. Wait five (5) minutes to clear out any gas. Then smell for gas, including near the floor. If you smell gas,
STOP! Follow “B” in the safety information above. If you do not smell gas, go to the next step.
6. Turn the manual gas valve ON. Wait an additional five (5) minutes smelling for gas.
7. Replace the front access panel.
8. Set thermostat to highest setting. Turn on all electric power to the boiler.
9. Ignition sequence is automatic. Combustion will occur after a brief fan purge.
10. If ignition does not occur, follow the instructions “To Turn Off Gas To Boiler” and call your service
technician or gas supplier.
TO TURN OFF GAS TO THE BOILER_
1. STOP! Read the safety information above very carefully.
2. Turn off all electric power to the boiler.
3. Turn the manual gas valve to the OFF position.
Crystalline Silica - Certain components confined in the combustion chamber may
contain this potential carcinogen. Improper installation, adjustment, alteration, service or
maintenance can cause property damage, serious injury (exposure to hazardous materials) or death. Refer to
Section 15.0 for information on handling instructions and recommended personal protective equipment.
Installation and service must be performed by a qualified installer, service agency or the gas supplier (who must
read and follow the supplied instructions before installing, servicing, or removing this boiler. This boiler
contains materials that have been identified as carcinogenic, or possibly carcinogenic, to humans).
Void Warranty - This Boiler must have water flowing through it whenever the burner is
on or it will damage the unit and void the warranty. Failure to follow these instructions
may result in serious injury or death.

Vmax I&O Manual │Introduction
3
1.0 INTRODUCTION
General Installation Requirements
The installation of your NTI Vmax gas boiler must conform to the requirements of this manual, your local
authority, and the National Fuel Gas Code ANSI Z223.1 and or CAN/CGA B149 Installation Codes. Where
required by the Authority, the installation must conform to the standard for “Controls and Safety Devices for
Automatically Fired Boilers ANSI/ASME CSD-1.”
This document pertains to the correct installation and operation of NTI Vmax boiler models VM110 and
VM110P (Vmax Plus). The instructions detailed in this document supersede any and all previous instructions
provided by NTI, written or otherwise. Each unit is provided with the following:
1. Installation and Operating Instructions,
2. Vmax Users’Manual, and
3. Natural Gas to LP Conversion Kit*
* The conversion kit is required to convert the boiler so it will safely operate with Propane Gas.
Read and understand this entire document prior to proceeding with the installation of the
Vmax boiler. Failure to follow the instructions outlined in this document will result in
property damage, serious injury or death.
Energy Saving Feature - This boiler is equipped with a feature that saves energy by
reducing the boiler water temperature as the heating load decreases. This feature is
equipped with an override which is provided primarily to permit the use of an external energy management
system that serves the same function. THIS OVERRIDE MUST NOT BE USED UNLESS AT LEAST ONE
OF THE FOLLOWING CONDITIONS IS TRUE:
An external energy management system is installed that reduces the boiler water temperature as the heating
load decreases.
This boiler is not used for any space heating.
This boiler is part of a modular or multiple boiler system having a total input of 300,000 BTU/hr. or greater.
This boiler is equipped with a tankless coil.
User Responsibilities
This boiler must be installed and serviced by a qualified installer or service technician. This boiler must be
serviced and inspected annually when operating in normal residential applications. Demanding applications or
extreme conditions (i.e. when operating with LP-Propane) may require more frequent service and inspection. As
the User/Owner of this equipment, you are responsible for ensuring the maintenance is performed at the required
intervals (see Section 16.0 –Annual Maintenance and Inspection).
Failure to have the boiler properly serviced and inspected on a regular basis by a qualified
service technician may result in property damage, serious injury or death.
Failure to keep the Vent and Combustion Air Intake clear of ice, snow, and other debris
may result in property damage, serious injury, or death.
Installer Responsibilities
As the installing technician it is your responsibility to ensure the installation is performed in accordance with this
instruction manual as well as any applicable local or National installation codes. It is also your responsibility to
inform the User/Owner of their obligation with respect to the above description under “User Responsibilities.”
Failure to follow this warning could result in fire, serious injury, or death.

Introduction │Vmax I&O Manual
4
Failure to use the appropriate Natural to LP Conversion Kit and Orifice when operating
the Vmax boiler with Propane will result in extremely dangerous burner operation
leading to property damage, serious injury or death. Refer to section titled
ATTENTION: LIQUEFIED PETROLEUM (LP) PROPANE for applicable conversion kit and LP orifice
number.
ATTENTION: LIQUEFIED PETROLEUM (LP) PROPANE
The Vmax boiler is factory set to operate with Natural Gas. BEFORE OPERATING WITH PROPANE, the
specified LP Conversion Kit and Orifice must be installed to convert the boiler so it will operate safely with
LP Propane. The correct kit and LP orifice is listed below (Each kit comes with conversion instructions).
Liquefied Petroleum (LP) propane gas is heavier than air; therefore, it is imperative that your Vmax boiler is
not installed in a pit or similar location that will permit heavier than air gas to collect. Local Codes may
require boilers fueled with LP gas be provided with an approved means of removing unburned gases from the
room. Check your local codes for this requirement.
Natural to LP Propane Conversion Kit_
Conversion Kit P/N LP Orifice Size Orifice P/N
84867-4 5.05 mm 84795
Exhaust Vent / Air-Inlet Piping
The Vmax VM110 and VM110P are certified as a “Category IV” boiler, and require a
“Special Venting System” designed for pressurized venting. The exhaust gases must be
piped directly to the outdoors using the vent materials and rules outlined in these instructions. Failure to follow
these instructions will result in serious injury or death.

Vmax I&O Manual │Introduction
5
IN THE STATE OF MASSACHUSETTS ONLY
(a) For all horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or
in part for residential purposes, including those owned and operated by the Commonwealth and where the side wall
exhaust vent termination is less than seven (7) feet above finished grade in the area of the venting, including but not
limited to decks and porches, the following requirements shall be satisfied:
1. INSTALLATION OF CARBON MONOXIDE DETECTORS At the time of installation of the side wall
horizontal vented gas fueled equipment, the installing plumber or gas fitter shall observe that a hard wired
carbon monoxide detector with an alarm and battery back-up is installed on the floor level where the gas
equipment is to be installed and on each additional level of the dwelling, building or structure served by the
equipment. It shall be the responsibility of the property owner to secure the services of qualified licensed
professionals for the installation of hard wired carbon monoxide detectors.
a. In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an
attic, the hard wired carbon monoxide detector with alarm and battery back-up may be installed on the next
adjacent floor level.
b. In the event that the requirements of this subdivision cannot be met at the time of completion of
installation, the owner shall have a period of 30 days to comply with the above requirements; provided,
however, that during said 30 day period a battery operated carbon monoxide detector with an alarm shall
be installed.
2. APPROVED CARBON MONOXIDE DETECTORS Each carbon monoxide detector as required in accordance
with the above provisions shall comply with NFPA 720 and be ANSI/UL 2034 listed and IAS certified.
3. SIGNAGE A metal or plastic identification plate shall be permanently mounted to the exterior of the building
at a minimum height of eight (8) feet above grade directly in line with the exhaust vent terminal for the
horizontally vented gas fueled heating boiler or equipment. The sign shall read, in print size no less than one-
half (1/2) inch in size, “GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS”
(plate included with boiler).
4. INSPECTION The state or local gas inspector of the side wall horizontally vented gas fueled equipment shall
not approve the installation unless, upon inspection, the inspector observes carbon monoxide detectors and
signage installed in accordance with the provisions of 248 CMR 5.08(2)(a)1 through 4.
(b) EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2)(a)1 through 4:
1. The equipment listed in Chapter 10 entitled “Equipment Not Required To Be Vented” in the most current
edition of NFPA 54 as adopted by the Board; and
2. Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure separate
from the dwelling, building or structure used in whole or in part for residential purposes.
(c) MANUFACTURER REQUIREMENTS –GAS EQUIPMENT VENTING SYSTEM PROVIDED: When the
manufacturer of Product Approved side wall horizontally vented gas equipment provides a venting system design or
venting system components with the equipment, the instructions provided by the manufacturer for installation of the
equipment and the venting system shall include:
1. Detailed instructions for installation of the venting system design or the venting system components; and
2. A complete parts list for the venting system design or venting system.
(d) MANUFACTURER REQUIREMENTS –GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED:
When the manufacturer of a Product Approved side wall horizontally vented gas fueled equipment does not provide
the parts for venting the flue gases, but identifies “special venting systems,” the following requirements shall be
satisfied by the manufacturer:
1. The referenced “special venting system” instructions shall be included with the appliance or equipment
installation instructions; and
2. The “special venting system” shall be Product Approved by the Board, and the instructions for that system shall
include a parts list and detailed installation instructions.
(e) A copy of all installation instructions for all Product Approved side wall horizontally vented gas fueled equipment,
all venting instructions, all parts list for venting instructions, and/or all venting design instructions shall remain with
the appliance or equipment at the completion of the installation.

Specifications│Vmax I&O Manual
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2.0 SPECIFICATIONS
Table 2-1 Vmax Specifications
DESCRIPTION
VM110
VM110P
CSA Input Modulation1
[MBH]
17 - 110
17 - 110
DOE Heating Capacity1,2
[MBH]
101
101
Net I=B=R Rating1,2
[MBH]
88
88
DOE AFUE2 [%]
95
95
Boiler Water Connections –NPT [in.]
1” (Male)
¾”(Male)
Domestic Hot Water Connections –NPT
[in.]
NA
¾”(Male)
Gas Connection - NPT, in.
½” (Male)
½” (Male)
Vent/Air-inletPipeDiameter
[in.] 3
2 or 3
2 or 3
Dimensions H x W x D [in.]
35-1/8 x 18-3/4 x 14-1/8
38-3/8 x 28-1/4 x 17-3/4
Approx. Boiler Weight
with Water [lbs.]
132
275
Approx. Boiler Water Content [Gallons]
3.2
3.2
Approx. Domestic Hot Water Content
[Gallons]
NA
16
Electrical Rating
120V/1Ph/60Hz/less than 12A
Notes:
1Listed Input and Output ratings are at minimum vent lengths using 3” venting, at an altitude of 0-2000 ft. Numbers will
be lower with longer venting and/or altitudes greater than 2000 ft. When operating with Natural Gas using 2” venting at
the minimum vent length, the Input ratings are reduced to 15 MBH at minimum and 102 MBH at maximum.
2Ratings based on standard test procedures prescribed by the U.S. Department of Energy.
3Vmax boilers require a special venting system, use only vent materials and methods detailed in these instructions.
Wall mounting of unit requires two people to lift the boiler into place. Failure to follow
these instructions may result in property damage or personal injury.
High Altitude Operation
The Vmax is designed to operate at its maximum listed capacity in installations located at 0-2000 ft above Sea
Level. Since the density of air decreases as elevation increases, maximum specified capacity should be de-rated
for elevations above 2000 ft [610 m] in accordance with Table 2-2.
Table 2-2 De-rate % for High Altitudes
Elevations
2001 ft [610 m]
3000 ft [914 m]
4000 ft [1219 m]
4500 ft [1372 m]
5000 ft [1524 m]
In Canada1
de-rate by 10%
de-rate by 10%
de-rate by 10%
de-rate by 10%
de-rate % may vary
In USA2
-
de-rate by 12%
de-rate by 16%
de-rate by 18%
de-rate by 20%
Notes:
1Canada: Altitudes between 2000-4500 ft [610-1372 m], de-rate by 10%. Consult local authorities for de-rating for
altitudes above 4500ft [1372 m].
2USA: De-rate capacity by 4% for every 1000 ft [305 m], if altitude is above 2000 ft [610 m].
Combustion –At elevations above 2000 feet, the combustion of the boiler must be
checked with a calibrated combustion analyzer to ensure safe and reliable operation. It is
the Installers responsibility to check the combustion and to adjust the combustion in accordance with
Section 9.0. Failure to follow these instructions may result in property damage, serious injury, or death.

Vmax I&O Manual │Boiler Location
7
3.0 BOILER LOCATION
In all cases, the Vmax VM110 & VM110P must be installed indoors in a dry location where the ambient
temperature must be maintained above freezing and below 100F [38C]. All boiler components must be
protected from dripping, spraying water, or rain during operation and servicing. Consider the proximity of
system piping, gas and electrical supply, condensate disposal drain, and proximity to vent termination when
determining the best boiler location.
Water or flood damaged components must be replaced immediately with new factory-
approved components as failure to do so may result in fire, serious injury, or death.
Boiler Area Ventilation Air Openings
If boiler area clearances are less than the recommended clearances specified in Table 3-1, the boiler area must be
ventilated (Exception: if the boiler area/room has a volume of 150 ft3or greater, ventilation of the boiler room is
not required). Each ventilation air opening must meet the minimum requirements of 1 in2per 1000 Btu/hr., but
not less than 100 in2. The lower ventilation opening must be located within 6 in. of the floor while the upper
opening must be located 6 in. from the top of the space.
If the "Boiler Area" does not meet the recommended clearances listed in Table 3-1, and if
the boiler area has a volume less than 150 ft3, it is considered a Closet or Alcove. In
US/Canada, PVC vent pipe and fittings shall not be used within the closet or alcove; only approved CPVC,
Polypropylene or Stainless Steel vent pipe and fittings can be used. See Table 4-4 for a list of approved materials.
Under all circumstances, the minimum clearances listed in Table 3-1 must be provided.
Closet Installations
For closet installations it is necessary to provide two ventilation air openings as shown in Figure 3-1, each
providing a minimum area equal to 1 in2per 1000 Btu/hr., but not less than 100 in2and within 6 in. of the top
and bottom of the closet door. See Table 3-1 for minimum clearances.
Alcove Installations
Alcove installations have the same minimum clearances as closet installations, except the front must be
completely open to the room at a distance no greater than 18 in. [457 mm] from the front of the boiler and the
room is at least three (3) times the size of the alcove. Provided these conditions are met, the boiler requires no
extra ventilation air openings to the space. See Table 3-1 for minimum clearances.
Residential Garage Installations
When installed in a residential garage, mount the boiler a minimum of 18 in. [457 mm] above the floor. Locate
or protect the boiler so it cannot be damaged by a moving vehicle. Check with your local authorities for other
possible regulations pertaining to the installation of a boiler in a garage.
Wall Mounting Installations
The Vmax VM110 & VM110P are provided with integrated wall mounting brackets. Refer to Figure 3-2 for
instructions and illustrations on wall mounting.
Table 3-1 Minimum Clearances for Installation and Service
Clearances
Dimensions - inches
Front
Top
Sides
Back
Bottom
Flue Pipe
Minimum
241
12
4
0
16
1
Recommended
36
24
12
0
24
1
Notes:
1 6 in. if surface is removable allowing a minimum of 24 in. clearance (i.e. closet installation). See Ventilation Air
Opening dimensions in Figure 3-1.
Closet/Alcove installations in US and Canada require approved CPVC, Polypropylene or
Stainless Steel vent and air-inlet pipe and fittings (see Table 4-4); PVC is not permitted.
Failure to follow these instructions may result in damage or serious injury.

Boiler Location │Vmax I&O Manual
8
Figure 3-1 Closet Installation, Minimum Clearances
Ventilation Air Openings are
not required if the boiler area
meets the Recommended
Clearances listed in Table 3-1.
Top ventilation
opening Max. 6” below
ceiling / top
Ventilation air opening
1in2per 1000 Btu/hr,
min. 100in2
Removable surface /
closet door
Ventilation air
opening 1in2per 1000
Btu/hr, min. 100in2
Bottom ventilation
opening Max. 6”
above floor / bottom
Sides = 4”
Top = 12”
Bottom = 16”
Min. 1” clearance
for hot water and
vent pipes
Front = 6”
(if removable)

Vmax I&O Manual │Boiler Location
9
Figure 3-2 Wall Mounting Instructions
Leave the Top Wall-mount Bracket (A) intact
and remove the Bottom Wall-mount Bracket
(B) that is attached to the bottom-back of the
boiler.
Secure Bottom Bracket (B), removed from the
bottom back of the boiler in Step 1, to a solid
wall using field supplied lag screws (anchors
when mounting to a concrete wall) that are
adequate to support the weight of the appliance
when filled with water (refer to Table 2-1
Specifications). Ensure the bracket is level and
flush to the wall. Mounting holes to be on the
bottom with flange pointed upward and angled
away from the wall.
Mount the boiler to the wall by aligning the
two wall mount brackets, Top Bracket (A)
with the Bottom bracket (B). Slide the top
bracket fastened to the boiler down over the
wall-mounted bracket until it hooks.
Once the boiler is resting securely on the wall,
attach the L-shaped Brackets (C) to the
underside of the appliance using the mounting
hardware supplied in the boiler kit box –adjust
to plumb the boiler. Anchor the L-shaped
Brackets (C) to the wall as shown using field
supplied hardware.
Failure to follow instructions may
result in fire, serious injury, or death.
This unit requires two people to lift it
or damage and injury may result.

Bottom
Bracket (B)
Wall
Boiler

Ensure Bracket
(A) fully inserts
into Bracket (B)
(B)
(A)

L-shaped Brackets
(C) shipped with
boiler kit box
Top Bracket (A)

Bottom
Bracket (B)

General Venting│Vmax I&O Manual
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4.0 GENERAL VENTING
The Vmax VM110 & VM110P are certified as a “Category IV” boiler requiring a “Special Venting System”
designed for pressurized venting. The Exhaust Vent must be piped to the outdoors, using the vent materials and
rules outlined in this section. Under no conditions may this unit vent gases into a masonry chimney, unless it is
vacant, and utilizes the approved venting material and rules described in this section.
Vent and Air-inlet are to be piped separately. The Vmax VM110 & VM110P cannot share
a common vent or air-inlet with multiple boilers. Failure to comply will result in serious
injury or death.
Direct Vent Installation (Best Practice)
When installed as a Direct Vent boiler the combustion air-inlet must also be piped directly to the outdoors using
the methods described in this section and in accordance with the National Fuel Gas Code, ANSI Z223.1 (U.S.) or
CSA B149.1 (Canada) and local requirements.
Installation Using Indoor Combustion Air
When the installation uses Indoor Combustion Air (i.e. piping is not directly connecting the appliance air-inlet
fitting to the outdoors), the combustion air-inlet is drawn from Indoors or Outdoors via the appliance area using
the methods described in this section and in accordance with the National Fuel Gas Code, ANSI Z223.1 (U.S.) or
CSA B149.1 (Canada) and local requirements.
The boiler shall be located so as not to interfere with proper circulation of combustion,
ventilation, and dilution air.
Make up air requirements for the operation of exhaust fans, kitchen ventilation systems,
clothes dryers, and fireplaces shall be considered in determining the adequacy of a space
to provide combustion air requirements. Failure to ensure adequate make up air to all appliances may result in
personal injury or death.
Indoor Combustion Air - Opening Size and Location: The methods detailed below for determining Opening
Size and Location for accessing indoor combustion air, shall be used when the air infiltration rate is adequate, i.e.
greater than 0.4 ACH (air changes per hour) and when the boiler area and communicating spaces have a
minimum volume of 50 cubic ft per 1000 Btu/hr. If the air infiltration rate is known to be less than 0.4 ACH,
refer to the National Fuel Gas Code for further guidance.
1. Combined spaces on the same story –Each opening shall have a minimum free area of 1in.2/1000 Btu/hr.
of the total input rating of all appliances in the space, but not less than 100 in2. One opening shall commence
within 12 in. of the top, and one opening shall commence within 12 in. of the bottom, of the enclosure, see
Figure 4-1a. The minimum dimension of air openings shall be not less than 3in.
2. Combined spaces in different stories –The volumes of spaces in different stories shall be considered as
communicating spaces where such spaces are connected by one or more openings in doors or floors having a
total minimum free area of 2 in.2 /1000 Btu/hr. ft.
3. Of total input rating of all appliances.
Outdoor Combustion Air –Opening Size and Location: Outdoor combustion air shall be provided through
opening(s) to the outdoors in accordance with the methods detailed below. The minimum dimension of air
openings shall not be less than 3 in.
1. Two Permanent Openings Method –Two permanent openings, one commencing within 12 in. of the top,
and one commencing within 12 in. of the bottom of the enclosure, shall be provided. The openings shall
communicate directly, or by ducts, with the outdoors or spaces that freely communicate with the outdoors, as
follows:
a. Where communicating with the outdoors or where communicating to the outdoors through vertical ducts,
each opening shall have a minimum free area of 1 in2/4000 Btu/hr. of total input rating of all appliances
in the enclosure; see Figures 4-1b and 4-1c.
b. Where communicating with the outdoors through horizontal ducts, each opening shall have a minimum
free area of 1 in2/2000 Btu/hr. of total input rating of all appliances in the enclosure; see Figure 4-1d.

Vmax I&O Manual │General Venting
11
2. One Permanent Opening Method –One permanent opening, commencing within 12 in. of the top of the
enclosure, shall be provided. The appliance shall have clearances of at least 4 in. from the sides, 1 in. from
the back and 6 in. from the front of the appliance. The opening shall directly communicate with the outdoors
or shall communicate through a vertical or horizontal duct to the outdoors or spaces that freely communicate
with the outdoors (see Figure 4-1e) and shall have a minimum free area of the following:
a. 1 in2/3000 Btu/hr. of the total input rating of all appliances located in the enclosure, and
b. Not less than the sum of the areas of all appliance vent connectors in the space.
3. Combination Indoor and Outdoor Combustion Air –The use of a combination of indoor and outdoor
combustion air shall be in accordance with the following:
a. Indoor Openings –where used, openings connecting the interior spaces shall comply with “Indoor
Combustion Air –Opening and Size and Location” described above.
b. Outdoor Openings –Outdoor opening(s) shall be located in accordance with “Outdoor Combustion Air
–Opening Size and Location” described above.
c. Outdoor Opening(s) Size –The outdoor opening(s) size shall be calculated in accordance with the
following:
i. The ratio of interior spaces shall be the available volume of all communicating spaces divided by the
required volume (i.e. 50 cubic ft per 1000 Btu/hr. if 0.4 ACH or greater).
ii. The outdoor size reduction factor shall be 1 minus the ratio of interior spaces.
iii. The minimum size of outdoor opening(s) shall be the full size of outdoor opening(s) calculated in
accordance with “Outdoor Combustion Air – Opening Size and Location” described above, multiplied
by the reduction factor. The minimum dimension of air openings shall not be less than 3 in.
Figure 4-1(a) Indoor Air
Figure 4-1(b) Two Vertical Ducts
Figure 4-1(c) Two Vertical Ducts
Figure 4-1(d) Two Horizontal Ducts
Figure 4-1(e) One Duct Options
Opening (within
1 ft of ceiling)
Opening (within
1 ft of floor)
Exhaust Vent
Opening
Opening
Exhaust Vent
Ventilation Louvers
(each end of attic)
Ventilated & unheated
crawl space
Exhaust Vent
Ventilation Louvers
(each end of attic)
Opening
Opening (duct
extended to within
1 ft of floor)
Exhaust Vent
Opening (within
1 ft of ceiling)
Opening (within
1 ft of floor)
Exhaust Vent
Ventilation Louvers
(each end of attic)
Opening Option B
(within 1 ft of ceiling)
Opening Option A

General Venting│Vmax I&O Manual
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Combustion Air-inlet Contamination
Be careful not to locate the air-inlet termination in an area where contaminants can be drawn in and used for
combustion. Combustion air containing dust, debris or air-borne contaminants will drastically increase the
required maintenance and may cause a corrosive reaction in the Heat Exchanger which could result in premature
failure, fire, serious injury, or death. See Table 4-1 for a list of areas to avoid when terminating air-inlet piping:
Table 4-1 Corrosive Products and Contaminant Sources
Products to Avoid
Contaminated Sources to Avoid
Antistatic fabric softeners, bleaches, detergents, cleaners
Laundry facilities
Perchloroethylene (PCE), hydrocarbon based cleaners
Dry cleaning facilities
Chemical fertilizer, herbicides/pesticides, dust, methane gas
Farms or areas with livestock and manure
Paint or varnish removers, cements or glues, sawdust
Wood working or furniture refinishing shops
Water chlorination chemicals (chloride, fluoride)
Swimming pools, hot tubs
Solvents, cutting oils, fiberglass, cleaning solvents
Auto body or metal working shops
Refrigerant charge with CFC or HCFC
Refrigerant repair shops
Permanent wave solutions
Beauty shops
Fixer, hydrochloric acid (muriatic acid), bromide, iodine
Photo labs, chemical / plastics processing plants
Cement powder, crack fill dust, cellulose, fiber based insulation
Concrete plant or construction site
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this
or any other boiler. Failure to follow instructions may result in serious injury or death.
It is BEST PRACTICE to pipe the combustion air-inlet directly to the outdoors (Direct
Vent installation) to avoid contamination often contained in indoor air.
Flammable Solvents and Plastic Piping
Due to the extremely flammable characteristics of most glues, cements, solvents and primers used in the process
of joining plastic vent and air-inlet pipe, explosive solvent vapors must be evacuated from the vent and air-inlet
prior to start-up. Avoid using excess cement or primer that may lead to pooling inside the pipe assembly. Freshly
assembled piping assembly should be allowed to cure for a minimum of 8 hours before applying power to the gas
fired boiler. Refer to Mandatory Pre-commissioning Procedure for Plastic Venting in this section.
Flammable Cements and Primers –It is the installers’ responsibility to familiarize
themselves with the hazards associated with explosive solvents and to take all precautions
to reduce these risks. Failure to follow these instructions can cause explosions, property damage, injury or death.
Mandatory Pre-commissioning Procedure for Plastic Venting (PVC or CPVC)
Do not apply power to the boiler prior to Step 4 in the Mandatory Pre-commissioning
Procedure for Plastic Venting.
1) Working with the power turned off to the boiler, completely install the vent and air intake system, securely
cementing joints together. If possible, allow primers/cements to cure for 8 hours before firing the burner. If
curing time is less than 8 hours, proceed with Steps 2 through 6.
2) Maintain the boiler gas supply shut-off valve in the off position.
3) Remove the cable from the Spark Ignition Electrode and Ignition Controller.
Spark Ignition Circuit - Maintain a safe distance (2 in. minimum) from the spark ignition
circuit to avoid injury from electrical shock.
4) Turn power on to the boiler and apply a heat demand.
5) Allow for 5 complete trials for ignition, consisting of pre and post purge of the combustion blower, until an
ignition lockout occurs. Repeat the process one more time (i.e. 10 complete ignition sequences in total).
6) Turn power off and reconnect the cable to the Spark Ignition Transformer.

Vmax I&O Manual │General Venting
13
Near Boiler Vent/Air-inlet Piping
The Vmax employs universal Exhaust-vent and Air-inlet appliance adapters that accept 3 in. PVC/CPVC,
Polypropylene (PP) or FasNSeal Stainless Steel (SS) piping, without the need for additional adapters. The
universal adapters incorporate three seals, one for 3 in. PVC/CPVC pipe (3.5 in. OD), one for 3 in. PP pipe (3.15
in. OD) and one for 3 in. FasNSeal SS pipe (3 in. OD). See Figure 4-2(a) for gasket identification and pipe
insertion depth based on pipe material used. Prior to inserting the piping into the universal adapter, ensure it is
properly bevel (approximately 1/8 in.) to avoid damaging or dislodging the sealing gasket during installation; see
Figure 4-2(b).
Gasket Seating - Improper seating can cause leakage and eventual failure of the sealing
gasket. Ensure the vent pipe is properly beveled, prior to installation, and that the pipe is
fully inserted into universal applicance adapter. Failure to follow these instructions may
result in serious injury or death.
PVC/CPVC Piping –Ensure the upper gasket of the universal appliance adapter is in place and properly
positioned prior to installation. Ensure the venting system does not apply a load or strain on the boiler flue
outlet adapter; recommend using two elbows to create a “swing joint”to reduce potential strain on vent piping
and cemented joints. When exhaust venting with PVC, use the supplied 5” long CPVC Transition Pipe
provided with the boiler; insert the CPVC pipe into the exhaust adapter and cement the other end to the PVC
exhaust venting using a field supplied PVC or CPVC coupling. See Figures 4-3(a) and 4-3(b).
PVC Exhaust Venting –DO NOT insert PVC pipe directly into the appliance exhaust
adapter, as it can deform from the clamping force of the gear clamp. Failure to follow
these instructions may result in gasket failure and/or the dislodging of the exhaust pipe
from the appliance adapter, resulting in property damage, serious injury or death.
PP Piping –Ensure the middle gasket of the universal appliance adapter is in place and properly positioned
prior to installation. Ensure the venting system does not apply a load or strain on the boiler flue outlet adapter;
recommend using an elbow with an offset to reduce potential strain on vent piping and cemented joints. See
Figure 4-3(c).
Stainless Steel Piping –The Vmax universal appliance adapter is designed to connect directly to DuraVent –
FasNSeal AL29-4C Stainless Steel Special Gas Vent. Ensure the lower gasket of the universal appliance
adapter is in place and properly positioned prior to installation. Ensure the venting system does not apply a
load or strain on the boiler flue outlet adapter; recommend using two elbows to create a “swing joint” to
reduce potential strain on vent piping and cemented joints. See Figure 4-3(d).
Exhaust venting must be supported to reduce strain on piping joints. Failure to follow
these instructions may result in result in damage, serious injury or death.
In Canada, the first 3 ft (915 mm) of vent piping must be readily accessible for inspection.

General Venting│Vmax I&O Manual
14
Figure 4-2 (a) Universial Exhaust-vent & Air-inlet Appliance Adapter
Gasket Identification and Pipe Insertion Depth
Figure 4-2 (b) Universial Exhaust-vent & Air-inlet Appliance Adapter
Proper Exhaust Vent Connection
Lower Gasket –3” OD Seal
use with Stainless Steel
Middle Gasket –3.14” OD Seal
use with Polypropylene
Upper Gasket –3.5” OD Seal
use with CPVC (PVC for Air-inlet)
2.36” (CPVC/PVC)
3.46” (PP)
4.17” (SS)
CPVC/PP/SS Exhaust Pipe
With 1/8” bevel to prevent
damage to gasket. When venting
with PVC, use 5” long CPVC
Transition Pipe (factory supplied)
Exhaust-Vent
Air-Inlet
Tighten Gear Clamp after
fulling inserting piping

Vmax I&O Manual │General Venting
15
Figure 4-3(a) VM110 & VM110P
Figure 4-3(b) VM110 & VM110P
Near Boiler Venting (PVC)
Near Boiler Venting (CPVC)
Figure 4-3(c) VM110 & VM110P
Figure 4-3(d) VM110 & VM110P
Near Boiler Venting (PPs)
Near Boiler Venting (SS)
Air-inlet - check with applicable local codes for acceptable pipe material.
PP Elbow w. offset angle
to account for slope
PP Exhaust Vent
Flue Outlet Adapter
(factory supplied)
Air-inlet Adapter
(factory supplied)
PP Air-inlet Pipe*
Swing Joint to attain
slope in horizontal runs
SS Exhaust Vent
Flue Outlet Adapter
(factory supplied)
Air-inlet Adapter
(factory supplied)
SS Air-inlet Pipe
Air Inlet Pipe*
Swing Joint to attain
slope in horizontal runs
CPVC Exhaust Vent
Air Inlet Adapter
(factory supplied)
Flue Outlet Adapter
(factory supplied)
Swing Joint
to attain slope in
horizontal runs
CPVC Transition Pipe
**minimum 5” long
(factory supplied)
Flue Outlet Adapter
(factory supplied)
**CPVC Transition Pipe
is mandatory when
venting with PVC
PVC Coupling
Air Inlet Adapter
(factory supplied)
PVC Air Inlet Pipe*
PVC Exhaust Vent

General Venting│Vmax I&O Manual
16
Vent/Air-inlet Pipe Material
Table 4-2 Approved Vent and Air-Inlet Pipe Material
Items 1
Materials 2, 3
Venting System Standards
All Vent and Air-Inlet
materials installed on gas
fired appliances in CAN/US
must meet the Standards
listed in this Table. Failure
to comply could result in
fire, serious injury or death.
United States
Canada 4
Vent Piping
and Fittings
PVC - DWV
ANSI/ASTM D2265
All venting material in
Canada must be
ULC S636 approved.
See Note 4 below for
appropriate temperature
applications.
PVC Schedule 40
ANSI/ASTM D1785
CPVC Schedule 40
ANSI/ASTM F441
Stainless Steel (SS)
UL-1738
Polypropylene (PP)
-
Pipe Cement
PVC
ANSI/ASTM D2564
CPVC
ANSI/ASTM F493
Primers
PVC / CPVC
ANSI/ASTM F656
Notes:
1 Refer to Table 4-5 for Allowable Vent and Air-inlet Pipe Sizes and Lengths.
2 PVC venting (exhaust and air-inlet) is not permitted within the Closet/alcove of a Closet/alcove installation.
3 The Air-inlet does not require high temperature pipe material. Check applicable local codes for acceptable materials.
4 ULC S636 PVC is approved for flue gas temperatures up to 149oF (65oC) and must only be used for low temperature
applications. High temperature applications requiring boiler supply water temperatures greater than 140oF (60oC) must
use ULC S636 CPVC, PP or SS.
The use of cellular core PVC (ASTM F891), cellular core CPVC, or Radel®
(polyphenolsulfone) in the exhaust venting system is prohibited. Failure to follow these
instructions may result in property damage, personal injury or death.
Covering non-metallic vent pipe and fittings with thermal insulation is prohibited. Failure
to follow these instructions may result in property damage, personal injury or death.
Vent/Air-inlet Pipe Length Determination
Use Table 4-3 to determine the maximum pipe length that can be used. The table calculates 90º elbows, and 45º
elbows at 5 equivalent feet each.
Example:When using 3 in. pipe, the Vmax can be installed with 150 equivalent feet of air-inlet piping and 150
equivalent feet of exhaust-vent piping. See Table 4-3 for more details.
Table 4-3 Allowable Vent and Air-inlet Pipe Size and Lengths
Pipe Size
Length (ft) 2
Number of Elbows (90’s or 45’s) and Equivalent Feet
1
2
3
4
5
6
7
8
9
2” 1
100 3
95
90
85
80
75
70
65
60
55
3”
150
145
140
135
130
125
120
115
110
105
Note:
1See WARNING below.
2Minimum length of each the exhaust vent and combustion air-inlet piping is 5 feet equivalent.
3When using 2 in., the combustion air-inlet piping must not exceed the length of the exhaust vent piping by more than 25
equivalent feet.
PVC Exhaust Venting –When using 2 inch PVC venting, the first seven (7) equivalent
feet of exhaust venting must be approved 2 inch CPVC or 3 inch PVC; see exceptions in
Table 4-2.

Vmax I&O Manual │General Venting
17
Termination Options –Direct Vent Installation
The venting system of the VM110 and VM110P may be terminated using field supplied piping to construct a
“Two-Pipe” termination, see Figures 4-4(a), 4-5(a), 4-5(d), 4-6(a), 4-7(a) and 4-7(d); alternatively the venting
may be terminated using a factory kit selected from Table 4-4.
Venting Options - Due to potential moisture loading (build-up) along the exterior wall,
sidewall venting may not be the preferred venting option (see Figures 4-5 and 4-7).
Optional Termination Kits –Direct Vent Installation
Kits certified with the Vmax VM110 & VM110P are listed in Table 4-4 and available from IPEX, DuraVent,
Centrotherm and/or NTI. For more information on System 636 Vent Kits or wholesaler locations contact IPEX
directly USA: 1-800-463-9572 or www.IPEXamerica.com │CAN: 1-866-473-9462 or www.ipexinc.com. For
more information on PolyPro Vent Kits or wholesaler locations contact DuraVent directly 1-800-835-4429 or
www.duravent.com. For more information on InnoFlue Vent Kits or wholesaler locations contact Centrotherm
directly at 1-877-434-3432 or www.centrotherm.us.com.
Table 4-4 Optional Vent Termination Kits
Description
Vent
Size
Supplier P/N
Figure
Vent Material
Compatibility
Vent Option
Roof
Wall
IPEX Low Profile
(Flush Mount)7
2”
196984
4-4(b), 4-6(c)
PVC/CPVC7


3”
196985 (NTI P/N 84357)
IPEX Concentric
(Wall/Roof)5,6,7
2”
196005
4-4(c), 4-5(c),
4-6(b), 4-7(b)


3”
196116 (NTI P/N 82666)
197009
DuraVent - PolyPro
Concentric (Wall)
2”
2PPS-HK
4-4(c), 4-6(d)
PVC/CPVC/PP


3”
3PPS-HK
DuraVent - PolyPro
Concentric (Roof)
2”
2PPS-VK
4-5(c), 4-7(c)


3”
3PPS-VK
Centrotherm –InnoFlue
(Flush Mount)
2”
ISLPT0202
4-4(b), 4-6(c)


3”
ISLPT0303
Centrotherm –InnoFlue
Concentric (Wall)8
2”
ICWS2413 & ICTC0224
4-4(c), 4-6(d)


3”
ICWS3513 & ICTC0335
ICWT352 & ICTC0335
Centrotherm –InnoFlue
Concentric (Roof)8
2”
ICRT2439 & ICTC0224
4-5(c), 4-7(c)


3”
ICRT3539 & ICTC0335
Notes:
1Instructions included with termination kits contain detailed assembly and installation instructions.
2All factory termination kits are ULC S636 approved.
3Clearance requirements in this manual supersede those of the instructions included with the vent terminal.
4Piping MUST be secured to the vent terminal during installation.
5IPEX Concentric Terminal MUST be cemented together and to the vent pipes during installation.
6Vent Screens provided with boiler may be used with the IPEX Concentric Vent Kits; otherwise use IPEX vent screens
(2 in. vent screen P/N 196050; 3 in. vent screen P/N 196051 –each sold separately).
7IPEX Low Profile and Concentric kits (excluding P/N 197009) are constructed out of ULC S636 approved PVC; check
with your local authority for the acceptance of PVC as a venting material prior to use.
8Centrotherm Concentric termination kits must use the applicable “Twin pipe to concentric adapter,”part number
ICTC0224 or ICTC0336.

General Venting│Vmax I&O Manual
18
Sidewall Venting Options –Direct Vent Installation
Figure 4-4(a)
Figure 4-4(b)
Two-pipe Termination (Sidewall)
Low Profile Termination (Sidewall)
Figure 4-4(c)
Concentric Termination (Sidewall)
Exhaust must terminate a
minimum of 18” above Air-inlet
termination; see Figure 4-6(a) for
more details.
Exhaust
Inlet
3” IPEX Low Profile Termination
illustrated; see Figure 4-6(c) for
more details.
Exhaust
Inlet
3” DuraVent Concentric
Termination illustrated, see
Figure 4-6(d) for more details.
Exhaust
Inlet
3” IPEX Concentric Termination
illustrated, see Figure 4-6(b) for
more details.
Exhaust
Inlet

Vmax I&O Manual │General Venting
19
Roof Venting Options –Direct Vent Installation
Figure 4-5(a)
Figure 4-5(b)
Two-pipe Termination (Roof)
Two-pipe Termination (Roof-exhaust / Sidewall-inlet)
Figure 4-5(c)
Concentric Termination (Roof)
3” DuraVent Concentric
Termination illustrated, see
Figure 4-7(c) for more details.
Exhaust
Inlet
Exhaust
Inlet
Exhaust must terminate a
minimum of 18” above the Air-
inlet termination; see Figure 4-
7(a) for more details.
3” IPEX Concentric termination
illustrated, see Figure 4-7(b) for
more details.
Exhaust
Inlet
Exhaust
Inlet
Exhaust must terminate a
minimum of 12” above snow
level; see Figure 4-7(d) for more
details.

General Venting│Vmax I&O Manual
20
Sidewall Termination Details –Direct Vent Installation
Figure 4-6(a)
Figure 4-6(b)
Two-Pipe Termination (Sidewall)
Two-Pipe Termination (Sidewall)
Refer to documentation included with termination kit for
complete installation instructions.
Figure 4-6(c)
Figure 4-6(c)
Low Profile Termination (IPEX Illustrated)
Low Profile Termination (IPEX Illustrated)
Refer to documentation included with termination kit for
complete installation instructions.
Min. 12”
above grade
or snow level
Exhaust
Air-inlet
Exhaust
Air-inlet around
perimeter
Min. 12”
above grade
or snow level
Exhaust center
Air-inlet bottom
Exhaust
Air-inlet
Gas Vent Directly Below
Keep Free of Obstructions
Refer to documentation included with termination kit for
complete installation instructions.
Exhaust
Air-inlet
Min. 12”
above grade
or snow level
Vertical
Min. 18”
Horizontal
4-12” or greater
than 36”
Exhaust
Air-inlet
Vent Screen
Vent pipe piece to
retain vent screen
Gas Vent Directly Below
Keep Free of Obstructions
Exhaust
Air-inlet
Min. 12”
above grade
or snow level
Air-inlet around
perimeter (1-2”
from wall)
Exhaust through
center
Vent Screen
Vent pipe piece to
retain vent screen