Vmax Boiler
NEW PRODUCT
Fire-tube Boiler
Model Number: VM110, VM110P,
VM153 & VM153P
Version Date: 2016-07-07
w/ Built-in Pump
INSTALLATION AND OPERATION MANUAL
TABLE OF CONTENTS
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
19.0
INTRODUCTION ................................................................................................................ 3
SPECIFICATIONS .............................................................................................................. 6
BOILER LOCATION .......................................................................................................... 7
GENERAL VENTING ....................................................................................................... 10
VENT/AIR-INLET TERMINATION CLEARANCES ..................................................... 22
CONDENSATE DRAIN .................................................................................................... 25
INSTALLING GAS PIPING .............................................................................................. 27
LIGHTING THE BOILER ................................................................................................. 29
GAS VALVE AND BURNER SET-UP ............................................................................ 32
BOILER AND HEATING SYSTEM PIPING ................................................................... 35
DOMESTIC HOT WATER (DHW) PIPING .................................................................... 51
FIELD WIRING ................................................................................................................. 54
CASCADE INSTRUCTIONS ............................................................................................ 57
WIRING SCHEMATICS ................................................................................................... 60
INSTALLATION CHECKLIST ........................................................................................ 62
ANNUAL MAINTENANCE AND INSPECTION ........................................................... 63
DISPLAY MENU GUIDE ................................................................................................. 65
TROUBLESHOOTING ..................................................................................................... 77
PARTS LIST ...................................................................................................................... 80
H
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
Warnings │
Vmax I&O Manual
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.
2
│Introduction
Vmax I&O Manual
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, VM110P,
VM153 and VM153P. 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 Operation Manual,
2. User Information 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. These instructions apply to all Vmax models, but some specifically
indicated sections apply specifically to Plus models VM110P and VM153P due to the
built-in water heater. 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.
3
Introduction │
Vmax I&O Manual
Vmax boilers are factory set to operate with Natural Gas; BEFORE OPERATING
WITH PROPANE, the boiler must be converted using the appropriate Natural Gas to
LP Conversion Kit; see below. Failure to properly convert the unit to safely operate with
Propane will cause dangerous burner operation, resulting in property damage, serious
injury or death.
ATTENTION: LIQUEFIED PETROLEUM (LP) PROPANE
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 Gas to LP Conversion Kit
Model
VM110 & VM110P
VM153 & VM153P
Natural Gas to LP Conversion Kit (part no.)
84867-4
85446-1
LP-Orifice/Venturi Insert (part no.)
84795
85536
Note:
Models VM110 & VM110P are converted to Propane using a 5.05 mm LP-Orifice (p/n 84795). Models VM153 &
VM153P are converted to Propane using a replacement LP-Venturi Insert (p/n 85536). Follow the Natural Gas to LP
Conversion Instructions provided with the Kit.
Exhaust Vent / Air-Inlet Piping
The Vmax is 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.
4
│Introduction
Vmax I&O Manual
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.
b.
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.
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 onehalf (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.
2.
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
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.
2.
Detailed instructions for installation of the venting system design or the venting system components; and
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.
2.
The referenced “special venting system” instructions shall be included with the appliance or equipment
installation instructions; and
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.
5
Specifications │
Vmax I&O Manual
2.0 SPECIFICATIONS
Table 2-1 Vmax Specifications
DESCRIPTION
VM110
VM153
VM110P
VM153P
17 - 110
15.4 - 154
17 - 110
15.4 - 154
101
141
101
141
88
122
88
122
1” (Male)
1” (Male)
1” (Female)4
1” (Male)
1
CSA Input Modulation
[MBH]
DOE Heating Capacity 1,2
[MBH]
Net I=B=R Rating 1,2
[MBH]
DOE AFUE2 [%]
Boiler Water Connections – NPT [in.]
95
Domestic Hot Water Connections –
NPT [in.]
Gas Connection - NPT, in.
Vent/Air-inlet Connections [in.] 3
Dimensions H x W x D [in.]
NA
3/4” (Male)
1/2” (Male)
3
35-1/8 x 18-3/4 x 14-1/8 38-3/8 x 21 x 19 – 1/8
38-3/8 x 28-1/4 x 17-3/4
Approx. Boiler Weight
with Water [lbs.]
132
160
275
300
Approx. Boiler Water Content
[Gallons]
3.2
3.9
3.2
3.9
Approx. Domestic Hot Water
Content [Gallons]
NA
16
120V/1Ph/60Hz/less than 12A
Electrical Rating
Notes:
1
Listed 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. For VM110(P) models 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.
2
Ratings based on standard test procedures prescribed by the U.S. Department of Energy.
3
Vmax boilers require a special venting system, use only vent materials and methods detailed in these instructions.
4
The VM110P comes with an externally mounted plumbing manifold, that adapts the central heat boiler connections to 1inch female sweat joint connections.
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 Canada 1
de-rate by 10%
de-rate by 10%
de-rate by 10%
de-rate by 10% de-rate % may vary
2
In USA
de-rate by 12%
de-rate by 16%
de-rate by 18%
de-rate by 20%
Notes:
1
Canada: Altitudes between 2000-4500 ft [610-1372 m], de-rate by 10%. Consult local authorities for de-rating for
altitudes above 4500ft [1372 m].
2
USA: 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.
6
│Boiler Location
Vmax I&O Manual
3.0 BOILER LOCATION
In all cases, the Vmax boiler 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 factoryapproved 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 ft3 or greater, ventilation of the boiler room is
not required). Each ventilation air opening must meet the minimum requirements of 1 in2 per 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 in2 per 1000 Btu/hr., but not less than 100 in2 and 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
Vmax boilers 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
Front
24 1
36
Top
12
24
Dimensions – inches
Sides
Back
4
0
12
0
Bottom
16
24
Flue Pipe
1
1
Minimum
Recommended
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.
7
Boiler Location │
Vmax I&O Manual
Figure 3-1 Closet Installation, Minimum Clearances
Min. 1” clearance
for hot water and
vent pipes
Top = 12”
Top ventilation
opening Max. 6” below
ceiling / top
Ventilation air opening
2
1in per 1000 Btu/hr,
2
min. 100in
Removable surface /
closet door
Ventilation air
2
opening 1in per 1000
2
Btu/hr, min. 100in
Bottom ventilation
opening Max. 6”
above floor / bottom
Bottom = 16”
Sides = 4”
Front = 6”
(if removable)
8
Ventilation Air Openings are
not required if the boiler area
meets
the
Recommended
Clearances listed in Table 3-1.
│Boiler Location
Vmax I&O Manual
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.

Top Bracket (A)
Bottom
Bracket (B)
Wall

Boiler
(A)
Bottom
Bracket (B)
(B)
Ensure Bracket
(A) fully inserts
into Bracket (B)


L-shaped Brackets
(C) shipped with
boiler kit box
9
General Venting │
Vmax I&O Manual
4.0 GENERAL VENTING
The Vmax is 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 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), provisions for combustion and ventilation air, in accordance with section “Air for
Combustion and Ventilation,” of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 (U.S.), or Clause 8.2, 8.3
or 8.4 of Natural Gas and Propane Installation Code, CAN/CSA B149.1 (Canada), or applicable provisions of
the local building codes, must be adhered to.
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.
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
Antistatic fabric softeners, bleaches, detergents, cleaners
Perchloroethylene (PCE), hydrocarbon based cleaners
Chemical fertilizer, herbicides/pesticides, dust, methane gas
Paint or varnish removers, cements or glues, sawdust
Water chlorination chemicals (chloride, fluoride)
Solvents, cutting oils, fiberglass, cleaning solvents
Refrigerant charge with CFC or HCFC
Permanent wave solutions
Fixer, hydrochloric acid (muriatic acid), bromide, iodine
Cement powder, crack fill dust, cellulose, fiber based insulation
Contaminated Sources to Avoid
Laundry facilities
Dry cleaning facilities
Farms or areas with livestock and manure
Wood working or furniture refinishing shops
Swimming pools, hot tubs
Auto body or metal working shops
Refrigerant repair shops
Beauty shops
Photo labs, chemical / plastics processing plants
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.
10
│General Venting
Vmax I&O Manual
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.
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 appliance 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
adaptefr, 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.
11
General Venting │
Vmax I&O Manual
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.
Figure 4-2 (a) Universal Exhaust-vent & Air-inlet Appliance Adapter
Gasket Identification and Pipe Insertion Depth
Upper Gasket – 3.5” OD Seal
use with CPVC (PVC for Air-inlet)
2.36” (CPVC/PVC)
3.46” (PP)
Middle Gasket – 3.14” OD Seal
use with Polypropylene
4.17” (SS)
Lower Gasket – 3” OD Seal
use with Stainless Steel
Figure 4-2 (b) Universal Exhaust-vent & Air-inlet Appliance Adapter
Proper Exhaust Vent Connection
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)
Air-inlet
Exhaust-Vent
12
Tighten Gear Clamp after
fulling inserting piping
│General Venting
Vmax I&O Manual
Figure 4-3(b) Near Boiler Venting (CPVC)
Figure 4-3(a) Near Boiler Venting (PVC)
Swing Joint
to attain slope in
horizontal runs
PVC Air-inlet Pipe*
PVC Exhaust Vent
Swing Joint to attain
slope in horizontal runs
PVC Coupling
CPVC Exhaust Vent
CPVC Transition Pipe
**minimum 5” long
(factory supplied)
Air-inlet Pipe*
Flue Outlet Adapter
(factory supplied)
Flue Outlet Adapter
(factory supplied)
Air-inlet Adapter
(factory supplied)
Air-inlet Adapter
(factory supplied)
**CPVC Transition Pipe
is mandatory when
venting with PVC
Figure 4-3(c) Near Boiler Venting (PP)
Figure 4-3(d) Near Boiler Venting (SS)
PP Elbow w. offset angle
to account for slope
PP Exhaust Vent
Swing Joint to attain
slope in horizontal runs
PP Air-inlet Pipe*
SS Exhaust Vent
Flue Outlet Adapter
(factory supplied)
SS Air-inlet Pipe
Air-inlet Adapter
(factory supplied)
Flue Outlet Adapter
(factory supplied)
Air-inlet Adapter
(factory supplied)

Air-inlet - check with applicable local codes for acceptable pipe material.
13
General Venting │
Vmax I&O Manual
Vent/Air-inlet Pipe Material
Table 4-2 Approved Vent and Air-inlet Pipe Material
Venting System Standards
2, 3
Items 1
Materials
4
United States
Canada
PVC - DWV
ANSI/ASTM D2265
PVC Schedule 40
ANSI/ASTM D1785
In Canada, all exhaust
Vent Piping
CPVC Schedule 40
ANSI/ASTM F441
vent material must be
and Fittings
Stainless Steel (SS)
UL-1738
ULC S636 approved.
See Note 4 below for
Polypropylene (PP)
appropriate
temperature
PVC
ANSI/ASTM D2564
applications.
Pipe Cement
CPVC
ANSI/ASTM F493
Primers
PVC / CPVC
All Vent and Air-Inlet
materials installed on gas
fired appliances in CAN/US
must meet the specifications
provided in this Table.
Failure to comply could
result in fire, serious injury
or death.
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; ABS and PVC Foam Core piping is acceptable. Check
applicable local codes for acceptable materials.
4
ULC S636 PVC is approved for flue gas temperatures up to 149 oF (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
Number of Elbows (90’s or 45’s) and Equivalent Feet
Models
Pipe Size (in.) Length (ft.) 2
1
2
3
4
5
6
7
8
9
VM110 & VM110P Only
21
100 3
95
90
85
80
75
70
65
60
55
All Vmax Models
3
150
145
140
135
130
125
120
115
110
105
Note:
1
See WARNING below.
2
Minimum length of each the exhaust vent and combustion air-inlet piping is 5 feet equivalent.
3
When 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.
14
│General Venting
Vmax I&O Manual
Termination Options – Direct Vent Installation
The venting system of the Vmax boilers 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).
The vent for this appliance shall not terminate over public walkways; or near soffit vents
or crawl space vents or other area where condensate of vapor could create a nuisance or
hazard or cause property damage; or where condensate or vapor could cause damage or
could be detrimental to the operation of regulators, relief valves, or other equipment.
Optional Termination Kits – Direct Vent Installation
Kits certified with Vmax boilers 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: 1-800463-9572 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
IPEX Low Profile
(Wall)7
IPEX Concentric
(Wall/Roof)4,5,6,7
PolyPro® Concentric
(Wall)
PolyPro® Concentric
(Roof)
InnoFlue® Flush Mount
(Wall)
Vent
Size
Supplier p/n
2”
196984
3”
196985 (NTI p/n 84357)
2”
196125
3”
196116 (NTI p/n 82666)
Figure
4-4(b), 4-6(c)
Vent Option
Roof
Wall


















PVC/CPVC7
4-4(c), 4-5(c), 46(b), 4-7(b)
197117
2-3”
2PPS-HK, 3PPS-HK
4-4(c), 4-6(d)
2-3”
2PPS-VK, 3PPS-VK
4-5(c), 4-7(c)
2-3”
ISLPT0202, ISLPT0303
4-4(b), 4-6(c)
InnoFlue® Concentric
(Wall)
2-3”
(ICWT242 & ICTC0224),
(ICWT352 & ICTC0335)
4-4(c), 4-6(d)
InnoFlue® Concentric
(Roof)
2-3”
(ICRT2439 & ICTC0224),
(ICRT3539 & ICTC0335)
4-5(c), 4-7(c)
2-3”
2ZDHK2, 2ZDHK3
4-3(d), 4-5(d)
2-3”
2ZDVK2, 2ZDVK3
4-4(c), 4-6(c)
Z-DENS® Concentric
(Wall)
Z-DENS® Concentric
(Roof)
Vent Material
Compatibility
PolyPro®
Polypropylene
InnoFlue®
Polypropylene
Z-DENS®
Polypropylene
Notes:
1
Instructions included with termination kits contain detailed assembly and installation instructions.
2
Clearance requirements in this manual supersede those of the instructions included with the vent terminal.
3
Piping MUST be secured to the vent terminal during installation.
4
IPEX Concentric Terminal MUST be cemented together and to the vent pipes during installation.
5
Vent 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).
6
IPEX Low Profile and Concentric kits (excluding p/n 197117) 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.
7
IPEX Concentric kits can be shortened to fit the requirements of the installation; see instructions included with the kit for
more details.
15
General Venting │
Vmax I&O Manual
Sidewall Venting Options – Direct Vent Installation
Figure 4-4 (a) Two-pipe Termination (Sidewall)
Figure 4-4 (b) Low Profile Termination (Sidewall)
3” IPEX Low Profile Termination
illustrated; see Figure 4-6(c) for
more details.
Exhaust must terminate a
minimum of 18” above Air-inlet
termination; see Figure 4-6(a) for
more details.
Inlet
Exhaust
Exhaust
Inlet
Figure 4-4 (c) Concentric Termination (Sidewall)
3” IPEX Concentric Termination
illustrated, see Figure 4-6(b) for
more details.
3” DuraVent Concentric
Termination illustrated, see
Figure 4-6(d) for more details.
Inlet
Inlet
Exhaust
16
Exhaust
│General Venting
Vmax I&O Manual
Roof Venting Options – Direct Vent Installation
Figure 4-5 (a) Two-pipe Termination (Roof)
Figure 4-5 (b) Two-pipe Termination (Roof/Sidewall)
Exhaust must terminate a
minimum of 18” above the Airinlet termination; see Figure 47(a) for more details.
Exhaust must terminate a
minimum of 12” above snow
level; see Figure 4-7(d) for more
details.
Inlet
Exhaust
Exhaust
Inlet
Figure 4-5 (c) Concentric Termination (Roof)
3” DuraVent Concentric
Termination illustrated, see
Figure 4-7(c) for more details.
3” IPEX Concentric termination
illustrated, see Figure 4-7(b) for
more details.
Inlet
Inlet
Exhaust
Exhaust
17
General Venting │
Vmax I&O Manual
Sidewall Termination Details – Direct Vent Installation
Figure 4-6 (a) Two-Pipe Termination (Sidewall)
Horizontal
4-12” or greater
than 36”
Figure 4-6 (b) IPEX Concentric Termination
(Sidewall)
Refer to documentation included with termination kit for
complete installation instructions.
Exhaust
Exhaust
Exhaust
Air-inlet
Vertical
Min. 18”
Air-inlet
Gas Vent Directly Below
Keep Free of Obstructions
Air-inlet around
perimeter (1-2”
from wall)
Air-inlet
Exhaust through
center
Vent Screen
Min. 12”
above grade
or snow level
Vent pipe piece to
retain vent screen
Figure 4-6 (c) Low Profile Termination (Sidewall)
Refer to documentation included with termination kit for
complete installation instructions.
Min. 12”
above grade
or snow level
Vent Screen
Vent pipe piece to
retain vent screen
Figure 4-6 (d) PolyPro / InnoFlue Termination
(Sidewall)
Refer to documentation included with termination kit for
complete installation instructions.
Exhaust
Exhaust
Air-inlet
Air-inlet
Air-inlet around
perimeter
Exhaust
Gas Vent Directly Below
Keep Free of Obstructions
Air-inlet bottom
Exhaust center
Min. 12”
above grade
or snow level
18
Min. 12”
above grade
or snow level
│General Venting
Vmax I&O Manual

Roof Termination Details – Direct Vent Installation
Figure 4-7 (a) Two-Pipe Termination (Roof)
Figure 4-7 (b) IPEX Concentric Termination (Roof)
Exhaust
Refer to documentation included with termination kit for
complete installation instructions.
Vent Screen
Vent pipe piece to
retain vent screen
Air-inlet
Vent pipe piece to
retain vent screen
Exhaust center
Vent Screen
Vertical
Min. 18”
Min. 12”
above grade
or snow level
Min. 12”
above grade
or snow level
Air-inlet around
perimeter
Flashing
Horizontal
4-12” or greater
than 36”
Flashing
Figure 4-7 (c) PolyPro / InnoFlue Termination (Roof)
Refer to documentation included with termination kit for
complete installation instructions.
Figure 4-7 (d) Exhaust only Termination (Roof)
Figure illustrates two options for exhaust termination only;
neither vent pipe illustrated is for combustion air-inlet.
Vent pipe piece to
retain vent screen
Exhaust
Option 1
Vent Screen
Exhaust
Min. 12”
above grade
or snow level
Air-inlet
Exhaust
Option 2
Min. 12”
above grade
or snow level
Flashing
Flashing
19
General Venting │
Vmax I&O Manual
Venting Rules and Guidelines
1. Prevailing Winds: Ensure the vent is located where it will not be exposed to normal prevailing winds.
2. Combustion Air-inlet Contamination: Air for combustion must be drawn from an area free of dust and
contaminants. Combustion air containing chemicals such as chloride, fluoride, bromine or iodine or dust and
debris will cause corrosion damage of the heat exchanger voiding your NTI warranty. Refer to Table 4-1 for
a list of corrosive products and contaminants sources to avoid.
3. Vertical Separation: The exhaust must be a minimum of 18 in. above the air-inlet, and the air-inlet must
always be a minimum of 12 in. plus snow allowance above any surface that will support snow. (Two feet
plus snow allowance is highly recommended). Consult your weather office for the maximum typical
snowfall for your region.
Example: New Brunswick Canada - typical maximum snowfall is 19 in., thus the inlet must be (12”+19”) =
31 in. above grade and exhaust must be (31”+18”) = 49” above grade.
4. Horizontal Separation: The horizontal distance between the inlet and exhaust must be a minimum of 4”
[102 mm] center to center.
5. Wall Flashing: Under normal operating conditions this boiler will produce a plume of white gases, and
should be taken into consideration when selecting an adequate location. A 36 in. diameter stainless, plastic,
or vinyl shield can be used to flash the exterior of the residence.
6. Flue Gas Hazard: Position the vent termination where vapors cannot make accidental contact with people
and pets or damage nearby shrubs and plants.
7. Elbow Extensions: Elbows on outside of wall must be no more than ½ in. away from the wall.
8. Vent Sloping: All indoor exhaust piping must be on a slope back to the boiler a minimum of ¼ in. per
linear foot of vent. For applications where excessive condensation is possible ½ in. per linear foot is
recommended.
9. Vent Supports: Where required Vent and Air-inlet piping shall be secured to the wall for more rigidity. All
interior vent pipe shall be supported a minimum of every 36 in..
10. Roof Exhaust: In all roof applications the discharge must point away from the pitch of the roof.
11. Roof Flashing: Install adequate flashing where the pipe enters the roof, to prevent water leakage.
12. Rain Cap: Install and seal a rain cap over existing chimney openings, in vacant chimney applications.
13. Venting Below Grade: For installations that exit the wall below grade refer to Figure 4-8.
14. Vent Screens: Install factory supplied vent screens on the outside of the last elbow for both the inlet and
exhaust vent terminal elbows. Install the screen into the female opening of the elbow, and then cut a small
piece of pipe to sandwich the screen into the elbow. NOTE: ensure the small piece of pipe cut, does not
extend past the end of the elbow. Two screens are provided in the package. See Figures 4-6 and 4-7.
15. Condensate Hazard: Do not locate vent over public walkways, driveways or parking lots. Condensate
could drip and freeze resulting in a slip hazard or damage to vehicles and machinery.
16. Warning Plate: For Sidewall Venting, install the warning plate “Gas Vent Directly Below”, directly above
(within 4 ft. vertically) the location of the air-inlet pipe, so it is visible from at least 8 ft away. See Figure 46.
17. Wall Thickness: Direct vent terminations are designed to work with any standard wall thickness.
Installation guidelines for min/max wall thickness are as follows: Min. = 1 in., Max. = 60 in..
18. Venting Options: Due to potential moisture loading (build-up) along the exterior wall, sidewall venting
may not be the preferred venting option. Refer to Figures 4-5 and 4-7 for roof top venting options.
20
│General Venting
Vmax I&O Manual
Figure 4-8 Venting Below Grade
For installations that exit the wall below grade:
1.
2.
3.
4.
5.
Excavate site to a point below where the pipes
are to exit as shown.
Ensure the wall is fully sealed where the pipes
penetrate.
The Vent/Air-inlet piping MUST be secured to
the side of the building above grade, as shown,
to provide rigidity.
Optional mounting bracket p/n. 82075 for
securing the exhaust pipes (only applicable for 3
in. PVC/CPVC venting).
Ensure that the Vent/Air-inlet clearances are
maintained, see Section 5.0 for details.
Exhaust
Air-inlet
Wall Brackets
Figure 4-9 Outdoor Venting
Vent piping outside the building is permitted under
the following conditions:
1. The maximum length outside the building is 20 ft.
Note that outdoor length must be included in the
overall vent length calculation.
2. All normal termination clearances are maintained.
3. The pipe is supported every 24 in..
4. The exhaust and inlet are sloped back to the boiler
½ in. elevation for every linear foot.
Gas Vent Directly Below
Keep Free of Obstructions
Supports every
24 in. [610 mm]
Exhaust
Vent
Maximum of 20 ft.
[6.1 m] is permitted
for piping outside a
building.
Air-Inlet
12 in. [305 mm] plus snow
allowance above grade
Figure 4-10 Existing Chimney Chase Way
It is permissible to use an existing chimney as a chase
way to run the Vent/Air-inlet piping as long as:
1. The chimney is not being used by any other
boiler.
2. Flue gases do not enter the vacant chimney.
3. Only Vmax certified venting materials are used,
see Table 4-2.
4. Vent lengths are within the maximums specified.
5. The top of the chimney is capped and the
Vent/Air-inlet pipes are flashed to prevent
leakage into the vacant chimney.
Exhaust Vent
Exhaust Vent Min.
18 in. above airinlet
Chimney
Cap
Air-Inlet
Existing
Chimney
(used as a
chase way)
Air-Inlet
Min. 12 in. above
roof and snow level
21
Condensate Drain│
Vmax I&O Manual
5.0 VENT/AIR-INLET TERMINATION CLEARANCES
The quick reference table below is to be read in conjunction with the numbered notes as
indicated, Figures 5-1 and 5-2, and the Venting Rules and Guidelines in Section 4.0. The
instructions detailed in this section are a combination of Vmax specific and National Gas Code restrictions.
Compliance alone does not insure a satisfactory installation as good common sense must also be applied. Failure
to follow these instructions may result in fire, property damage, serious injury or death.
Table 5-1 Termination Clearances Quick Reference Table (See Figures 5-1 and 5-2)
Clearances to Air-inlet Termination
Canada 1
Min. Distance
12 in.
305 mm
24 in.
610 mm
36 in.
915 mm
Min. Distance
12 in.
305 mm
18 in.
457 mm
4 in.
102 mm
36 in.
915 mm
36 in.
915 mm
36 in.
915 mm
6 ft.
1.83 m
24 in.
610 mm
6 ft.
1.83 m
36 in.
915 mm
36 in.
915 mm
36 in.
915 mm
7 ft.
2.13 m
USA 2
Min. Distance
12 in. 305 mm
24 in. 610 mm
12 in. 305 mm
Min. Distance
12 in. 305 mm
18 in. 457 mm
4 in. 102 mm
12 in. 305 mm
12 in. 305 mm
12 in. 305 mm
3 ft. 915 mm
24 in. 610 mm
6 ft. 1.83 m
36 in. 915 mm
36 in. 915 mm
36 in. 915 mm
7 ft. 2.13 m
A Above grade/roofline and snow level 8
B Above roof line - Concentric Vent 6, 11, 13
C To exhaust vent from any other boiler
Clearances to Exhaust Vent Termination
A Above grade/roofline and snow level 8
D Minimum vertical separation above air-inlet 9
E Minimum horizontal separation from air-inlet 3
F Window or door that may be opened, or other building opening
G To combustion air-inlet of any other appliance
H Non-mechanical air supply inlet to building
I Mechanical air supply inlet to building 4
J Soffit, overhang, eave or parapet
K Soffit vent or vent opening in an overhang, eave or parapet
L Outside corner 10
M Inside corner of an L-shaped structure (including walls and fences)
N Service regulator / vent outlet
P Each side of center line above or below meter / regulator assembly 5
Q Above a paved sidewalk, driveway, or parking lot on public property if adjacent 12
X
X
X
X
R Above a public walkway
Above a sidewalk or paved driveway that is located between two single family
X
X
X
X
S
dwellings and services both dwellings
7
T Under a concrete veranda, porch, deck, or balcony
24 in.
610 mm 24 in. 610 mm
X
X
X
X
U Above, under or near exterior stairs
X
X
X
X
V Into a canopy or carport
Notes:
1 - Canadian installations must comply with the current CSA B149.1 Natural Gas and Propane Installation Code and local
building codes.
2 - US installations must comply with current ANSI Z223.1/ NFPA 54 National Fuel Gas Code and local building codes.
3 - Horizontal separation center-to-center (c.c.) 4”-12” (102-305 mm).
4 - For US installations, an exhaust vent must be 3 ft above a mechanical air supply inlet if within 10 ft. [3 m] horizontally.
5 - Horizontal clearance must be observed up to a height of 15 ft. [4.6 m] above/below the meter, regulator, or relief devices.
6 - Concentric Vent must protrude from the roof precisely 24” [610 mm] measuring from the terminal end-cap vanes.
7 - Permitted if veranda, porch, deck, or balcony is made of concrete and a minimum of two sides are fully open beneath.
8 - 24” is the recommended snow level allowance above grade/roofline or any surface that will support snow, debris, or ice
(i.e. for roof venting clearances - roofline and snow level). If living in a snowfall region, consult your local weather
office for the maximum typical snowfall for your area.
9 - Note that the vent must maintain a minimum vertical distance above the air-inlet. Example: Vent height = 18” (457
mm) above air-inlet + 12” (305 mm) for air-inlet above grade/roof line and snow level = 30” (762 mm) above grade
and snow level.
10 - Clearances to an outside corner to be in accordance with local installation codes.
11 - In Canada, concentric vent materials are subject to approval by local inspectors. See Termination Kits in Section 4.0.
12 - Above public walkways, driveways or parking lots if adjacent to it and condensate cannot drip, freeze, or create a hazard.
13 - Contact the manufacturer for special exemptions relating to multiple boiler installations using concentric vents.
_X - Not permitted by National gas code(s) and/or recommended by boiler manufacturer.
22
│Condensate Drain
Vmax I&O Manual
Figure 5-1 Termination Clearance Quick Reference Diagram (See Table 5-1)
Illustrations of Termination Clearances
Figure 5-2 Sidewall Termination (See Table 5-1)
Clearances “F” and “G”
Canada – Minimum 3 ft. [915 mm]
The US – Minimum 1 ft. [305 mm]
Two-Pipe
Termination
F
Clearance “Q”
Adjacent to Public
Walkway or Driveway
Minimum 7ft. [2.13 m]
G
Q
Concentric Vent
Termination
G – Letter represents a specific Termination Position. Refer to Table 5-1 for corresponding termination clearances.
23
Condensate Drain│
Vmax I&O Manual
Extra precaution must be taken to adequately support the weight of the Vent/Air-inlet
piping in applications using roof-top terminations. Failure to follow these instructions
may result in venting or boiler component failure resulting in flue gas spillage leading to
property damage, serious injury or death.
Under no circumstances may an existing chimney or chase-way be used to vent or
provide combustion intake air to a Vmax. Failure to follow these instructions will result
in fire, property damage, serious injury or death.
Removing an Existing Boiler from Common Venting System
Do not install a Vmax boiler into a common venting system with any other boiler. Failure
to comply with this warning will cause flue gas spillage and leech carbon monoxide
emissions into the surrounding air resulting in serious injury or death.
When an existing boiler is removed from a common venting system, the common venting
system is likely to be too large for proper venting of the remaining boilers connected to
it. Instructions have been provided on how to remove the existing boiler and how to
resize the remaining venting system. Failure to follow these instructions may result in
property damage, serious injury or death.
Upon removal of an existing boiler, the following steps shall be followed for each boiler remaining in the
common venting system; prior to commencing this procedure, shutdown all boilers remaining in the common
venting system.
Steps to Removing an Existing Boiler:
1. Seal any unused openings in the common venting system.
2. Visually inspect the venting system for proper size and horizontal pitch. Verify that there is no blockage,
restriction, leakage, corrosion or other deficiencies which could cause an unsafe condition.
3. Insofar as is practical, close fireplace dampers, all building doors and windows and all doors between the
space in which the boilers remaining connected to the common venting system are located and other spaces
of the building. Turn on clothes dryers and any boiler 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.
4. Place in operation the boiler being inspected. Follow the applicable lighting instructions. Adjust thermostat
so boiler will operate continuously.
5. Test for spillage at the draft hood relief opening after 5 minutes of main burner operation. Use the flame of a
match, lighter or candle.
6. After it has been determined that each boiler remaining connected to the common venting system properly
vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other
gas burning boiler to their previous condition of use.
7. Any improper operation of the common venting system should be corrected so the installation conforms to
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 54 and/or CAN/CSA B149.1, Natural Gas and Propane
Installation Code.
24
│Condensate Drain
Vmax I&O Manual
6.0 CONDENSATE DRAIN
The Vmax boilers produce liquid condensate in the heat exchanger and venting system as a product of
combustion. Steps must be taken to ensure condensate does not collect in the venting system; therefore, all
exhaust piping must slope back to the boiler a minimum ¼ in. per linear foot of vent. Condensate must be
drained from the unit into a household drain.
Check with your municipality, or local gas company to determine if the disposal of
combustion condensate is permitted in your area (e.g. in the State of Massachusetts the
condensate must be neutralized prior to entering a drain).
The following are important notes that must be taken into consideration when constructing the condensate drain
system (see Condensate Trap Installation Instructions for further details):
 DO NOT install condensate lines outside. A frozen or blocked drain will cause the condensate to back-up
and leak. This may result in damage to boiler components resulting in a no heat condition; property damage
may also occur.
 NEVER use copper, steel, or galvanized piping in the construction of the condensate system (condensate is
very corrosive and will corrode most metals).
 When a condensate pump is used or required, select a pump that is designed for residential furnaces.
All tubing, drains and surfaces that come in contact with condensate draining from the
boiler, must be constructed out of corrosion resistant material; copper, steel and
galvanized are not acceptable materials for draining condensate. Failure to abide by this
caution will result in property damage.
Condensate Trap Installation Instructions (see Figure 6-1)
(Note: the Condensate Trap is factory supplied with the boiler and must be field installed)
1. Inspect Condensate Trap Assembly – Inspect the Condensate Trap to ensure all parts were shipped with
the assembly (see Figure 6-1). The Condensate Trap must be periodically disassembled and cleaned as part
of a regular maintenance plan.
2. Attach to Boiler Condensate Drain – Insert the inlet fitting of the Condensate Trap into the boiler
condensate drain; secure with the factory supplied gear clamp (see Figure 6-1). Pull down on the Condensate
Trap and ensure that it remains securely fastened.
3. Outlet to Drain – Direct condensate from the outlet of the Condensate Trap to a household drain,
condensate pump or neutralizer (check with your local authority regarding the disposal of condensate). If
necessary connect suitable ¾” tubing to the bottom of the Condensate Trap and route it to drain, being
careful NOT to route it higher than the Condensate Trap outlet (see Figure 6-1).
The Condensate Trap must be periodically disassembled and cleaned as part of a regular
maintenance plan. Failure to clean the trap regularly can cause condensate drain blockage
leading to boiler malfunction, property damage and even personal injury.
Carefully follow the above instructions and the accompanying figure – check to ensure
the condensate trap is secure to the bottom of the boiler and that no strain is placed on it.
Failure to install the condensate trap properly will result in flue gas spillage and leeching
of carbon monoxide emissions into the surroundings resulting in serious injury or death.
25
Condensate Drain│
Vmax I&O Manual
Figure 6-1 Condensate Drain Piping

Inspect Condensate
Trap assembly
Boiler Condensate Drain
Gear Clamp
(factory supplied)
Condensate Trap
(factory supplied)

Attach to Boiler Condensate Drain
Tighten gear clamps and pull
down on Condensate Trap to
test secureness

Outlet to Drain
Direct condensate to a vented drain, ensure no strain is
applied to the Condensate Trap and Boiler Condensate
Drain. If necessary, add a piece of ¾” tubing to the
bottom of the Condensate Trap as illustrated.
26
│Lighting the Boiler
Vmax I&O Manual
7.0 INSTALLING GAS PIPING
Vmax boilers are factory set to operate with Natural Gas; BEFORE OPERATING
WITH PROPANE, the boiler must be converted using the appropriate Natural to LP
Conversion Kit; see Table 7-1. Failure to properly convert the unit to safely operate with
Propane will cause dangerous burner operation, resulting in property damage, serious
injury or death.
Liquefied Petroleum (LP) propane gas is heavier than air. Do not install the boiler in a pit
or similar location that will permit heavier than air gas to collect. Check with Local
Codes as they may require boilers fueled with LP gas to be provided with an approved
means of removing unburned gases from the room. Failure to follow these instructions
may result in serious injury or death.
Table 7-1 Natural Gas to LP Conversion Kit
Model
Kit Number
LP-Orifice/Venturi Insert (part no.)
VM110 & VM110P
84867-4
84795
VM153 & VM153P
85446-1
85536
Note:
Models VM110 & VM110P are converted to Propane using a 5.05 mm LP-Orifice (p/n 84795). Models VM153 &
VM153P are converted to Propane using a replacement LP-Venturi Insert (p/n 85536). Follow the Natural Gas to LP
Conversion Instructions provided with the Kit.
Installation
Refer to the current National Fuel Gas Code ANSI Z223.1/NFPA 54 or CAN/CGA B149.1 installation codes,
and local codes for gas piping requirements and sizing. Pipe size running to the unit depends on:
 Length of pipe.
 Number of fittings.
 Type of gas.
 Maximum input requirement of all gas boilers in the residence.
Ensure that:
 The gas line connection to the boiler does not apply any weight to the gas valve. NTI recommends using
approved flexible gas piping (if acceptable by local codes) to connect the boiler to the gas supply (see Figure
7-1 for details).
 You plan the installation so the piping does not interfere with the vent pipe, or the removal of the valve,
burner, and serviceable components.
 The Boiler is installed such that the gas ignition system components are protected from water (dripping,
spraying, rain etc.) during installation and servicing.
 The gas piping is large enough for all the gas appliances in the home. No appreciable drop in line pressure
should occur when any unit (or combination of units) lights or runs. Use common gas-line sizing practices.
 Always use a pipe-threading compound that is resistant to Propane (LP) gas solvent action. Apply sparingly
to all male threads, starting at two threads from the end. Over doping or applying dope to the female end,
can result in a blocked gas line.
 DO NOT TIGHTEN FITTINGS WITHOUT SUPPORTING THE INTERNAL GAS LINE CONNECTION
WITHIN THE BOILER as damage to the boiler’s internal gas carrying components could occur.
 Install a manual “Equipment Shut-Off Valve” as shown in Figure 7-1. Valve must be listed by a nationally
recognized testing laboratory.
 The gas line piping can safely be removed from the boiler for servicing, by strategically placing the gas line
shutoff and union; see example in Figure 7-1.
 All gas piping, including gas components in the boiler, are checked for leaks using a “Bubble Test”, prior to
operating the boiler.
Strain on the gas valve and fittings may result in vibration, premature component failure
and leakage and may result in a fire, explosion, property damage, serious injury or death.
Do not use an open flame to test for gas leaks. Failure to follow these instructions may
result in fire, property damage, serious injury or death.
27
Lighting the Boiler│
Vmax I&O Manual
When performing a pressure test on the gas line piping, be sure the boiler is disconnected
or isolated if the test pressure is expected to exceed 1/2 PSI (14 in. w.c.), as damage to the
gas valve could occur resulting in fire, property damage, serious injury or death.
Figure 7-1 Gas Line Connection (Typical)
Flexible Gas Line Piping
Recommended to eliminate strain on the
boiler gas components (only use if
acceptable by local codes).
Manual Gas Shutoff Valve
Should overheating occur or the gas
supply fails to shutoff, close the Manual
Gas Shutoff Valve to the boiler.
Union
Drip Leg
Rigid Gas Line Piping
Use only rigid gas line piping within the
boiler cabinet. Rigid piping must
protrude beyond the outside of the
cabinet wall.
Test all gas piping, internal and external to the boiler, for leaks. Failure to follow these
instructions may result in fire, property damage, serious injury or death.
28
│Lighting the Boiler
Vmax I&O Manual
8.0 LIGHTING THE BOILER
Before Start-up refer to Mandatory Pre-commissioning Procedure for Plastic Venting
in Section 4.0. Failure to follow these instructions can result in explosions, injury or death.
Prior to turning the gas supply on and lighting the boiler, ensure all aspects of the
installation are complete and in conformance with the instructions provided in this
manual, including the Vent/Air-inlet, Condensate Drain, and System Water Piping.
Failure to precisely follow these instructions will cause a fire or explosion resulting in
property damage, serious injury or death.
Do not store or use gasoline or other flammable vapors & liquids in the vicinity of this or
any other boiler. Failure to follow instructions could result in explosion causing property
damage, serious injury or death.
If you do not follow these instructions exactly, a fire or explosion may result causing
property damage, serious injury or death.
Should overheating occur or the gas supply fails to shutoff, close the Manual Gas Shutoff
Valve to the boiler. Failure to follow instructions could result in explosion 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
29
Lighting the Boiler│
Vmax I&O Manual
The initial lighting of the boiler must be performed by a licensed Gas Technician.
Failure to follow instructions may result in property damage, serious injury or death.




Ensure the boiler is wired in accordance with this manual.
Ensure the gas shutoff valve is turned on, and that the gas system has been fully tested for leaks.
Ensure the system is completely filled with water, and that ALL the air is purged out.
Ensure the Vent and Air-inlet piping is completely installed in accordance with this manual.
Allow primers/cements to cure for 8 hours prior to Start-up. If curing time is less than 8
hours, first perform Steps 2 through 6 of Mandatory Pre-commissioning Procedure for
Plastic Venting in Section 4.0. Failure to follow these instructions can result in explosion,
serious injury or death.
Initial Start-Up
Each time the power is turned on to the boiler, the control will go through a “de-air” sequence designed to purge
air from the boiler. The de-air sequence takes 14 minutes to execute, during which time the circulators will be
operating in a cyclical manner and the burner will not attempt to function. Once the de-air sequence has been
executed at least once, subsequent de-air sequences can be bypassed by holding the “OK” button until “de-Air” is
no longer displayed on the screen; see Section 17.0 for more details.
1. Turn on power to the boiler and turn-up the Thermostat(s). The boiler should run through a purge, and
combustion should occur. (The control system has a built-in ignition retry, allowing the system to try at least
five times, before locking-out).
2. With the unit operating at full capacity, verify that the gas line pressure is 4-10.5 inches w.c. for Natural gas,
and 9-13 inches w.c. for Propane (see Section 9.0 for details).
3. Using an appropriate Oxygen (O2) or Carbon Dioxide (CO2) analyzer, take a sample of the flue gas. The
sample must fall within the acceptable ranges for CO2 (see Section 9.0 for details).
4. Perform at least three ignitions in succession to ensure proper operation.
5. After the three successive ignitions, unplug the flame sensor and allow the unit to cycle again. The flame
safety system will allow the unit to go through 5 ignition cycles before going to “Loc 1”. Once you have
confirmed this behavior, reinstall the wire on the flame sensor, press the reset button and reconfirm proper
ignition.
The flame probe is located in the burner plate; it has a single white/semi-transparent wire
connected to it. DO NOT remove the orange spark cable from the ignition electrode (also
located in the burner plate); this device is used for spark ignition and produces 20,000
Volts potential which would result in an EXTREME ELECTRICAL SHOCK possibly
causing serious injury or death.
If the unit fails to light consistently and smoothly, contact NTI for technical assistance at
1-800-688-2575. Never allow the boiler to operate if the ignition or operation of the
burner is rough or erratic. Failure to follow these instructions may result in serious injury
or death.
Re-lighting Unit
1. Stop and read these instructions very carefully.
2. Set the thermostat to the lowest setting, and then turn off all power to the boiler.
3. This boiler does not have a pilot. It is equipped with an ignition device that automatically lights the burner.
Do not try to light the burner by hand.
4. Turn the gas shutoff valve to the off position, and then remove the front cover.
5. Wait five (5) minutes to clear out any gas. Then check for gas, including near the floor. If you smell gas
“Stop” and follow “B” above (see FOR YOUR SAFETY, READ BEFORE OPERATING). If you do
not detect any gas proceed to the next step.
6. Turn the gas shutoff valve to the on position, wait an addition five (5) minutes and check for gas.
7. Replace the front cover.
8. Set the thermostat to the highest setting, and then turn on all power to the boiler.
9. Ignition sequence is automatic, combustion will occur after a brief fan purge. Ignition will retry 3 times.
10. If ignition does not occur, “Turn off the gas and electricity to the boiler” and contact a qualified service
technician, or gas supplier.
30
Vmax I&O Manual
│Lighting the Boiler
Turning Off the Boiler
1. Set the thermostat to the lowest setting, and then turn off all power to the boiler.
2. Turn the gas shutoff valve to the off position.
31
Gas Valve and Burner Set-up │
Vmax I&O Manual
9.0 GAS VALVE AND BURNER SET-UP
Set-up of the Vmax gas valve must be performed by a licensed Gas Technician. Failure
to perform the set-up correctly may result in incorrect operation, component failure,
property damage, serious injury or death.
Gas Line Pressure
The boiler gas valve is equipped with a line pressure test port; see Figure 9-1. Use the following procedure to
measure the gas line pressure to the boiler to ensure if falls within the range given in Table 9-1:
1. Turn the supply of gas to the boiler off.
2. Open the bleed screw of the line pressure test port approximately 1-1/2 turns. This port is directly connected
to the gas line feeding the boiler. See Figure 9-1.
3. Force ¼ in. ID tubing over the housing of the line pressure test port; install the other end of the tubing to an
appropriate line pressure test gauge or manometer. Ensure both ends of the tubing make a tight connection.
4. Open the supply of gas to the boiler and check for gas leaks.
5. Observe the line pressure under static conditions and compare it to Table 9-1. The pressure will be greatest
under static conditions.
6. With all other gas appliances in the application running, operate the burner to the maximum firing rate (see
Table 9-2) and compare the observed line pressure with Table 9-1. The pressure will be lowest during the
maximum flow of gas.
7. Adjust the gas line pressure to ensure the parameters in Table 9-1 are attained under all conditions (see
NOTICE below). If possible adjust the line pressure to the "Nominal/Desired" value listed in Table 9-1,
while the unit is operating at the maximum modulation rate, see Table 9-2.
8. Continue observing the gas line pressure until the completion of the combustion analyses, in case
adjustments need to be made.
9. Complete pressure testing, and then return the bleed screw of the Line Pressure Test Port to the closed
position.
The line pressure is a function of the gas supply and is affected solely by field provided
parameters such as line size and regulator settings. Under no circumstances can the boiler
gas valve influence or be used to adjust the gas line pressure.
Failure to close the bleed screw of the Line Pressure Test Port will cause a severe leakage
of gas, resulting in a fire or explosion causing property damage, serious injury or death.
Table 9-1 Line Pressure and Combustion Parameters
Line Pressure (inches w.c.)
Gas
Nominal/Desired
Min.
Max.
Natural
7
4
10.5
Propane
11
8
13
Model
VM110, VM110P
VM153, VM153P
VM110, VM110P
VM153, VM153P
CO2 (%)
Min.
Max.
9.0
9.8
8.4
9.2
10.0
10.8
9.7
10.5
CO (ppm)
Max.
175
175
175
175
Notes:
1
Combustion calibration must only be performed with the burner operating at maximum modulation rate.
2
Combustion values listed are for burner operation at maximum modulation rate; CO 2 and CO values will be lower at minimum
modulation rate.
3
When tested at minimum modulation rate, the CO2 must be 0.4-0.8% lower than CO2 at maximum modulation rate.
Table 9-2 Minimum and Maximum Modulation Rates
Model
Gas
Appliance Number
VM110
VM110P
NG/LP
NG/LP
NG
LP
NG
LP
8
9
10
13
11
14
VM153
VM153P
32
Min. Modulation Rate
(RPM)
1320
1320
1740
Max. Modulation Rate
(RPM)
6960
6960
7980
7500
7980
7500
│Gas Valve and Burner Set-up
Vmax I&O Manual
Carbon Monoxide - Never leave the unit operating while producing Carbon Monoxide
(CO) concentrations in excess of 175ppm. Failure to follow this warning may result in
serious injury or death.
Manifold Pressure - DO NOT adjust or measure the Manifold Pressure of the boiler.
Correct manifold pressure is factory set. Field adjustment could result in improper burner
operation resulting in fire, explosion, property damage or death.
Adjustments to the Throttle/Input Screw may only be made by a qualified gas technician,
while using a calibrated combustion analyzer capable of measuring CO2 and CO.
Adjustments may only be performed if the gas line pressure is maintained above
minimum levels throughout the duration of the test, see Table 9-1. Failure to follow these
instructions may result in serious injury or death.
Throttle/Input Adjustment Screw
Decrease gas
Turn Clockwise
Increase gas
Turn Counter Clockwise
Adjustment
Throttle / Input Screw Adjustments - The boiler is equipped with a Throttle/Input Adjustment Screw, located
on the Gas Valve. It is used to adjust the flow of gas leaving the gas valve entering the Venturi and then the
combustion air stream. Turn the Throttle screw in (clockwise) to reduce the flow of gas, make combustion
leaner, and reduce the concentration of CO2 in the flue gases. Turn the Throttle screw out (counterclockwise)
to increase the CO2 level and flow of gas in the combustion air stream. Typical adjustment required is 0-1/2
of a turn in or out from the factory setting. See Figure 9-1 for Throttle screw location and Table 9-1 for
appropriate CO2 levels.
Combustion Calibration - To calibrate burner operation, perform the following procedure using a calibrated
combustion analyzer capable of measuring CO2 and CO from Natural and Propane Gas burning boilers:
1. Operate the unit at the maximum modulation rate, see Table 9-2.
2. Ensure the gas line pressure is maintained within tolerance, see Table 9-1.
3. While at the maximum modulation rate, measure the CO2 and CO; adjust as necessary, using the Throttle
Screw, to be within the limits listed in Table 9-1.
4. Operate the unit at the minimum modulation rate (see Table 9-2). Ensure the combustion remains smooth
and CO2 and CO values are lower than the values obtained during maximum modulation, per notes in
Table 9-1. If not, do not adjust further, contact NTI for assistance.
Flue Gas Analysis and Adjustment
Each Vmax is factory set to operate with Natural Gas, for boilers field converted to operate with Propane Gas, a
flue gas analysis and adjustment is mandatory. See Table 7-1 for the correct Natural Gas to LP Conversion Kit.
Failure to perform the flue gas analysis and adjustment detailed in this section may result
in erratic and unreliable burner operation, leading to reduced efficiency, increased fuel
consumption, reduced component life, heat exchanger combustion deposits, and general
unsafe operation. Failure to follow these instructions may result in serious injury or
death.
Analysis – Perform flue gas analysis, and adjust throttle/input screw as required until CO2 and CO levels are
within acceptable limits.
33
Gas Valve and Burner Set-up │
Vmax I&O Manual
Figure 9-1 Gas Valve and Venturi Assembly
Line Pressure
Test Port
Throttle / Input
Adjustment Screw
Gas Valve
Manifold Pressure
Test Port
DO NOT Adjust
Venturi
34
│Boiler and Heating System Piping
Vmax I&O Manual
10.0
BOILER AND HEATING SYSTEM PIPING
The fire tube design of the Vmax heat exchanger results in minimal head loss, however it must be considered
when sizing system piping and circulators. Furthermore, the low mass of the Vmax heat exchanger requires a
minimum flow rate anytime the burner is operating. To maintain the efficient and reliable operation of the heat
exchanger, and to avoid heat exchanger failure, it is critical to ensure the rules and guidelines in this section are
followed.
Failure to follow the instructions provided in this section will void the NTI warranty and
may result in property damage, fire, serious injury or death.
Boiler System Preparation
Prior to connecting plumbing to the boiler, flush the entire system to ensure it is free of sediment, flux, solder,
scale, debris or other impurities that may be harmful to the system and boiler. During the assembly of the
heating system, it is important to keep the inside of the piping free of any debris including construction and
copper dust, sand and dirt.
For retrofits, all system piping, including radiators, must be cleansed of build-up including sludge and scale. All
systems, old and new, must be cleansed to remove flux, grease and carbon residue; NTI recommends cleaning
the boiler system with “Fernox F3 Cleaner.” For retrofit applications with heavy limescale and sludge deposits, a
heavier duty cleaner may be required; NTI recommends the use of “Fernox DS-40 System Cleaner.” For
information on performing the cleaning, follow the instructions included with the applicable Fernox Cleaner. See
Table 10-1 for a list of recommended boiler system cleaning and treatment products.
Failure to rid the heating system of the contaminants listed above will void your NTI
warranty and may result in premature heat exchanger failure and property damage.
Table 10-1 Boiler System Cleansers and Corrosion Inhibitors
Application
Fernox Product
NTI Part #
Boiler Water Treatment
Cleanser for new and old systems
Cleanser for Retrofits
F1 Protector
F3 Cleaner
DS-40 System Cleaner
83448
83449
83450
Description
Corrosion inhibitor.
Removes flux, grease and carbon residue.
Removes heavy limescale and sludge deposits.
Boiler Water
Pressure - Vmax boilers are intended solely for use in pressurized closed-loop heating systems operating with a
minimum pressure of 12 PSI at the boiler outlet. To obtain the minimum system design pressure, follow the
piping diagrams illustrated in this section.
Oxygen Elimination - This boiler may only be installed in a pressurized closed-loop heating system, free of air
and other impurities. To avoid the presence of oxygen, ensure all of the air is removed from the system
during commissioning via strategically placed, adequately sized air-removal devices; located throughout the
heating system. See figures in this section detailing the location of the primary air-removal device required
for the boiler. Immediately repair any leaks in the system plumbing to avoid the addition of make-up water;
make-up water provides a source of oxygen and minerals that may lead to heat exchanger failure. Failure to
follow these instructions will result in poor performance, unnecessary wear of system components and
premature failure.
Vmax boilers are not approved for operation in an “open system,” thus it cannot be used
for direct potable water heating or process heating of any kind.
Water Chemistry – The installer of the Vmax boiler must consider the condition of the water in the heating
system. Ensure the condition of the boiler water falls within the following parameters:
 PH – between 6.6 and 8.5.
 Iron – less than 0.5mg/l.
 Chloride – less than 125mg/l.
 Copper – less than 0.1mg/l.
 Conductivity – less than 400µS/cm (at 25ºC); [TDS < 200ppm or Total Hardness < 11.6grains/USgal.]
35
Boiler and Heating System Piping │
Vmax I&O Manual
Treatment - Boiler water that falls outside of the conditions listed above must be treated with a corrosion
inhibitor. For information on performing the treatment, follow the instructions included with the corrosion
inhibitor. See Table 10-1 for a list of recommended boiler system cleaners and corrosion inhibitors.
To maintain protection, the level of corrosion inhibitor must be monitored periodically
for the correct concentration.
Anti-freeze - For systems requiring freeze protection, use only inhibited propylene glycol, specially formulated
for hydronic heating systems; use of other types of antifreeze may be harmful to the system and will void the
warranty. Note: the use of glycol may reduce the usable output capacity of the boiler, thus requiring the unit
to be “down-fired” by limiting the maximum operating capacity and/or the maximum water temperature. NTI
recommends against exceeding 35% concentration of glycol.
DO NOT use inhibited glycol with non-compatible boiler inhibitors. Non-compatible
inhibitors may counteract each other rendering them ineffective.
Near Boiler Plumbing (Central Heating)
Pressure Relief Valve - A Pressure Relief Valve is factory supplied with each Vmax unit. Vmax boilers have a
maximum allowable operating pressure of 30 PSI. The pressure relief valve must be installed in the vertical
position, as illustrated in Figures 10-1, 10-2(a), 10-2(b) and 10-3(a), with the drain pipe outlet exiting the side
of the pressure relief valve horizontally. Pipe the outlet of the relief valve towards the floor, away from where
it could be harmful.
If installed in the incorrect orientation (horizontally with drain pipe out the bottom) the
relief valve may not function properly resulting in property damage or personal injury.
Ensure the discharge of the pressure relief is piped to a location where the steam or water
will not cause property damage or serious injury.
Pressure & Temperature Gauge – Vmax boilers come with a factory supplied Pressure and Temperature
Gauge. The pressure gauge must be installed at the boiler outlet prior to any circulators. See Figures 10-2(c),
10-4, 10-5 and 10-6.
Low Water Cutoff (LWCO) – Vmax boilers are provided with a factory installed Water Pressure Sensor. The
sensor provides a reading of the boiler inlet water pressure on the display; in the event the pressure drops
below 7 PSI, the control will go to a blocking error “FILL”, inhibiting burner operation. Where required by
the Authority having jurisdiction, an external LWCO may have to be installed; see Figure 10-1.
Figure 10-1 Installation of Optional LWCO
Auto Air Vent – keep open to
avoid false trips of the LWCO
Low Water Cutoff Location
(when required by local authorities)
Install the LWCO in a suitable tee (reference
installation instructions provided with the
LWCO) as illustrated. DO NOT install
isolation valves between the boiler and the
LWCO. The LWCO switch must be wired to
break the boiler limit circuit or line power to
the boiler (see Section 12.0 – Field Wiring).
NTI offers the following LWCO kit p/n 85253.
When the installation is complete, TEST THE
LWCO to ensure the burner shuts down when
the water level drops.
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Near Boiler Piping (Central Heating – CH)
Figure 10-2 (a) VM110 Top – Option A
Figure 10-2 (b) VM110 Top – Option B
Auto Air Vent
(factory supplied)
1x1/2x1” Brass Tee
(factory supplied)
1x3/4” Brass Bushing
(factory supplied)
Auto Air Vent
(factory supplied)
1x1/2x1” Brass Tee
(factory supplied)
1” Nipple
(field supplied)
30 PSI Relief Valve
(factory supplied)
30 PSI Relief Valve
(factory supplied)
3/4” Brass Street Elbow
(factory supplied)
1x1x3/4” Brass Tee
(field supplied)
Outlet to Indirect
Water Heater
Figure 10-2 (c) VM110 Bottom
Inlet from Indirect Water Heater
(and location for boiler drain)
Pressure &
Temperature Gauge
(factory supplied)
Tee Fitting - Typical
(field supplied)
Central Heat Outlet
Central Heat Inlet
Condensate Drain
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Figure 10-3 VM110P, VM153 & VM153P Top
Auto Air Vent
(factory supplied)
30 PSI Relief Valve
(factory supplied)
3/4x1/2x3/4” Brass Tee
(factory supplied)
3/4” Brass Street Elbow
(factory supplied)
150 PSI T&P Relief Valve
(factory supplied)
Note: VM110P & VM153P
Only
Figure 10-4 VM110P (Plus) Bottom
DHW Out
Boiler Outlet
DHW Recirc.
Boiler Inlet
DHW In
Gaskets
(factory supplied)
Condensate Drain
Pressure &
Temperature
Gauge
(factory supplied)
Central Heat Outlet
Primary Loop
(factory supplied)
Central Heat Inlet
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Figure 10-5 VM153 Bottom
IWH Supply
Boiler Inlet
IWH Return
Condensate Drain
Pressure &
Temperature Gauge
(factory supplied)
Boiler Outlet
Tee Fitting –
Typical
(field supplied)
Bushing – Typical
(field supplied)
Figure 10-6 VM153P Bottom
Boiler Inlet
DHW Out
DHW Recirc.
Condensate Drain
DHW In
Boiler Outlet
Pressure &
Temperature
Gauge (factory
supplied)
Tee Fitting – Typical
(field supplied)
Bushing – Typical
(field supplied)
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Boiler System Plumbing
Vmax boilers use a low mass heat exchanger that requires forced water circulation any time the burner is
operating. To ensure the minimum flow rate is attained, carefully following the plumbing instructions in this
section.
Circulating Pumps (VM110) – the VM110 incorporates a Central Heat Pump and “Primary Loop” with
“Closely Spaced Tees”; therefore, only the DHW Pump (Indirect Fired Water Heater Pump) needs to be sized
to ensure adequate water flow through the boiler. See Table 10-2 and Figure 10-4 for assistance in sizing the
DHW Pump for Vmax model VM110.
Circulating Pumps (VM110P, VM153 and VM153P) – VM110P, VM153 and VM153P models incorporate a
Boiler Pump, Diverter Valve and “Primary Loop” with “Closely Spaced Tees” [Note: the VM110P Primary
Loop is field installed below the boiler – see Figure 10-3(b)]. Sizing circulators to ensure minimum flow
through the these boilers is NOT necessary.
Circulating Pump Outputs – Vmax boilers are equipped with three 120VAC pump outputs:
1. DHW PUMP - operates during a Domestic Hot Water demand (DHW). The DHW PUMP output is not
used on VM110P and VM153P models.
2. CH PUMP - operates during a Central Heat demand (CH). The VM110 internal pump is factory wired to
the CH PUMP output.
3. BOILER PUMP - operates during any demand. The VM110P, VM153 and VM153P internal pump is
factory wired to the BOILER PUMP output. NOTICE: the BOILER PUMP output is only used to
operate boiler pump of a VM110 that is part of a cascade system, see Figure 13-1.
Ensure circulating pumps are oriented as per the manufacturers’ instructions. Wiring of these circulators will
depend on the system configuration selected; see Figures 10-5 through 10-9. For further wiring details see
Section 12.0.
Failure to ensure the minimum water flow rate through the boiler when the burner is
operating will result in “short-cycling”, reduced performance and operating efficiency,
and may also cause overheating and premature failure which will void the warranty.
Failure to follow instructions may result in fire, property damage, serious injury or death.
Table 10-2 VM110 DHW Circulator and Pipe Size Requirements
Minimum Primary Loop Pump Size (Model)
Temp.
Boiler Flow Boiler Head Minimum
Model
Rise (ºF) Rate (USGPM) Loss (ft)
Pipe Size
B&G
Grundfos
Taco
Armstrong
20
10
3.9
1”
NRF-22
UPS15-58 (3)
0010
Astro 230 (3)
VM110
25
8
3.4
1”
NRF-22
UPS15-58 (2)
007
Astro 230 (2)
35
6
2.7
1”
NRF-22
UPS15-58 (2)
005
Astro 230 (2)
Notes:
1
Pump sizing accounts for the head loss associated with the boiler, a Trin & Stor S40 Indirect Water Heater and up to 30
equivalent feet of the specified minimum pipe diameter.
2
Only the pump responsible for generating flow through the Indirect Water Heater connected to a VM110, needs to be
sized to ensure adequate flow rate through the boiler.
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Figure 10-7 VM110 Head Loss Curve (Only Applicable for DHW Demands)
6
Head Loss (ft)
5
4
3
2
1
0
2
4
6
8
10
12
Flow Rate (US gpm)
Air Removal – The boiler and system plumbing layout must be configured to promote the removal of air from
the water. Air vents and bleeders must be strategically placed throughout the system to aid in purging the air
from the system during commissioning of the boiler. The system must also employ the use of a strategically
located air removal device, such as an air-scoop or micro-bubbler, designed to remove the air from the water
as it flows through the system.
Follow the installation instructions included with the air removal device when placing it
in the system; air removal devices generally work better when placed higher in the
system. Always locate air removal devices in areas of the system that have a guaranteed
positive pressure, e.g., in close proximity to the water fill and expansion tank.
Vmax are equipped with an automatic air vent to aid in purging of air from the boiler
during the initial fill. This air vent is not intended to be the primary air removal device in
the system.
Expansion Tank – The expansion tank must be sized in accordance with the water volume of the system as well
as the firing rate of the appliance. It is important to locate the expansion tank, and make-up water fill, on the
inlet side of any circulator in the system, as doing so will guarantee the lowest pressure in the system will be
at least equal to the tank and make-up water pressure. See examples in Figures 10-8 through 10-16.
Ensure the expansion tank cannot become isolated from the boiler anytime the system is
operating. The installation of flow checks, motorized valves or other shutoff devices
(other than for the purpose of servicing) are not permitted between the outlet of the boiler
and the expansion tank; see Figures 10-8 through 10-16. Failure to follow these
instructions may result in discharge of the Pressure Relief Valve resulting in property
damage or personal injury.
Indirect Fired Water Heater (IWH) – If installing an IWH with a VM110, there are various installation
options to be considered, consult Figure 10-2 and Figures 10-8 through 10-10 for specific examples. For
model VM153, there are fewer options, see Figures 10-5, 10-11 and 10-12. Plus models VM110P and
VM153P incorporate an IWH, one cannot be installed external to the unit.
Figures 10-8 through 10-16 illustrate typical piping systems. These piping schematics do
not illustrate all of the required concepts and components required to have a proper
installation. Concepts not shown include: prevention of thermal-siphoning (heat traps),
isolation valves, drain and purge valves, etc. It is the responsibility of the installing contractor and system
designer to determine which system best meets the need of the installation and to consider all aspects of a proper
system design. Contractor modifications to these instructions may be required, based upon existing piping and
system design; consult NTI for required assistance (1-800-688-2575).
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Figure 10-8 VM110 Plumbing Schematic – Single CH Pump
w/ Indirect Fired Water Heater (Option A)
Figure illustrates the basic
plumbing requirements for
a VM110 boiler installation with a single Central
Heating circulator, and an Indirect Fired Water Heater
installed using Option A. Refer to Figure 10-2 for boiler
fitting identification.
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Figure 10-9 VM110 Plumbing Schematic – Single CH Pump
w/ Indirect Fired Water Heater (Option B)
Figure illustrates the basic
plumbing requirements for
a VM110 boiler installation with a single Central
Heating circulator, and an Indirect Fired Water Heater
installed using Option B. Refer to Figure 10-2 for boiler
fitting identification.
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Boiler and Heating System Piping │
Figure 10-10 VM110 Plumbing Schematic – Multiple CH Pumps
w/ Indirect Fired Water Heater
Figure illustrates the basic
plumbing requirements for
a VM110 boiler installation with multiple Central
Heating circulators, and an Indirect Fired Water
Heater. Refer to Figure 10-2 for boiler fitting
identification.
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Figure 10-11 VM153 Plumbing Schematic – Single CH Pump
w/ Indirect Fired Water Heater
Figure illustrates the basic
plumbing requirements for
a VM153 boiler installation with a single Central
Heating circulator, and an Indirect Fired Water Heater.
Refer to Figures 10-3 and 10-5 for boiler fitting
identification.
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Boiler and Heating System Piping │
Figure 10-12 VM153 Plumbing Schematic – Multiple CH Pumps
w/ Indirect Fired Water Heater
Figure illustrates the basic
plumbing requirements for
a VM153 boiler installation with multiple Central
Heating circulators, and an Indirect Fired Water
Heater. Refer to Figures 10-3 and 10-5 for boiler
fitting identification.
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Figure 10-13 VM110P Plumbing Schematic – Single CH Pumps
Figure illustrates the basic
plumbing requirements for
a VM110P boiler installation with single Central
Heating circulators. . Refer to Figures 10-3 and 10-4
for boiler fitting identification.
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Boiler and Heating System Piping │
Figure 10-14 VM110P Plumbing Schematic – Multiple CH Pumps
Figure illustrates the basic
plumbing requirements for
a VM110P boiler installation with multiple Central
Heating circulators. . Refer to Figures 10-3 and 10-4
for boiler fitting identification.
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Figure 10-15 VM153P Plumbing Schematic – Single CH Pump
Figure illustrates the basic
plumbing requirements for
a VM153P boiler installation with a single Central
Heating circulator. Refer to Figures 10-3 and 10-6 for
boiler fitting identification.
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Boiler and Heating System Piping │
Figure 10-16 VM153P Plumbing Schematic – Multiple CH Pump
Figure illustrates the basic
plumbing requirements for
a VM110P boiler installation with multiple Central
Heating circulators. Refer to Figures 10-3 and 10-6 for
boiler fitting identification.
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11.0
DOMESTIC HOT WATER (DHW) PIPING
DHW Description of Operation
Vmax Plus models, VM110P & VM153P, incorporate a Stainless Steel 16 gallon DHW storage tank with an
internal Stainless Steel heat exchanger coil (Indirect Fired Hot Water Heater). This allows the Vmax Plus to heat
DHW without the need for a separate water heater. A temperature sensor continuously monitors the temperature
of the potable water in the tank, thereby ensuring that a constant supply of hot water is available. The tank
temperature can be adjusted via Installer Menu setting 2-07 (“DHW Setpoint”). Set “DHW Setpoint” to the
desired hot water temperature; to avoid the risk of scalding a Thermostatic Mixing Valve MUST be installed, see
Figure 11-1.
VM110P DHW Plumbing & Set-up
DHW Connections – The VM110P & VM153P have three potable water connections, Inlet/Drain, Outlet and
Recirculation; see Figure 11-1. If a recirculation line is not being used, be sure to cap the Recirculaiton
connection on the bottom of the Vmax Plus.
Throttling Valve – Use one of the isolation valves, installed in the hot water line, as a throttle valve to regulate
the maximum hot water flow rate. The VM110P and VM153P have a limited firing rate (110 MBH and 154
MBH); therefore excessive flow rates will quickly deplete the hot water stored in the tank – recommend not to
exceed 3.8 USGPM for VM110P and 5.3 USGPM for VM153P.
Drain and Isolation Valves – Install drain and isolation valves on the cold water inlet and hot water outlet lines,
as shown in Figure 11-1, to allow for servicing of the storage tank and other potable water components. It may
be necessary to flush or clean the inside of the storage tank.
Figure 11-1 Near Boiler DHW Piping (VM110P & VM153P)
Recirculation Optional
(cap if not in use)
DHW Outlet (Hot)
Condensate
Drain
(install factory
supplied trap)
DHW Inlet (Cold)
Tempering Valve
(Manditory)
Drain Valve
DHW to Fixtures
Isolation Valve
Cold Water Supply
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Safe Temperatures for Potable Water
Two factors used to determine safe hot water temperatures are Legionella and scalding. Potable water needs to
be stored at temperatures hot enough to limit the growth of Legionella, yet be cool enough to prevent scalding.
Since both hazards present a potential risk to the user, they must be monitored and controlled.Table 11-1
indicates how water temperature affects Legionella bacteria and contributes to scald injury. Use of a thermostatic
mixing valve in the indirect water heater plumbing system (or at point of use) can help protect against both of
these hazards. By storing potable water at higher temperatures, bacteria growth is controlled, while still
providing high temperature water for dishwasher applications and low temperature water for bathing. Before
proceeding, read the following carefully and take all necessary precautions to avoid potential illness and/or
injury that can result from Legionella or scalding hazards.
Legionella Hazard - This bacteria is naturally occurring in surface water and ponds. It
can also be found in man-made water systems around the world such as water storage
tanks, water distribution systems, fountains, hot tubs, humidification systems,
refrigeration systems and grocery produce misters. Health authorities agree that
Legionella bacteria most often enter the lungs due to aspiration when contaminated water
spray is breathed in as opposed to ingesting drinking water contaminated with the
bacteria. Typical illnesses attributed to Legionella include flue like symptoms (Pontiac
Fever) and a potentially fatal type of pneumonia (Legionnaires’ disease). Failure to
follow instructions may result in illness or death.
Contributing Factors to Legionella - Experts acknowledge that Legionella is an identified risk in most water
systems. Although eradicating Legionella is improbable, precautions can be taken to control and monitor
conditions that promote bacteria growth. According to the World Health Organization (WHO); American
Society of Heating, Refrigeration, and Air-conditioning Engineers (ASHRAE); Canada Safety Council
(CSC); and Centers for Disease Control (CDC), contributing factors to the growth of Legionella in potable
water systems include:

Minerals and nutrients present in the source water and systems materials

Stagnation or low flow characteristic of dead ends in distribution piping systems and storage tanks

Scale, corrosion, and bio film

Tepid water in cold water lines

Water storage temperatures optimal for bacteria growth

Chlorine concentration
Thermostatic Mixing Valve – due to the potentially high hot water temperature stored
in the water heater, a thermostatic mixing valve (or equivalent anti-scald device) must be
installed according to Figure 11-1, local code and the installation instructions provided
with the the thermostatic mixing valve, to reduce scald hazard potential. Anit-scald
devices such as a thermostatic mixing valve allows potable water to be stored at a higher
temperature to limit bacteria growth, and allows water at the tap to be delivered at a
lower temperature to prevent scalds. Failure to follow these instructions may result in
serious injury or death.
Scald Hazard - There is a hot water scald potential if the thermostatic mixing valve (or
other anit-scald device) is set too high. Refer to the installation instructions provided
with the thermostatic mixing valve, prior to attempting adjustments. Failure to follow
these instructions may result in serious injury or death.
A scald injury can occur when hot steam or liquid makes contact with one or more layers
of skin. Scald severity (degree of burn) is directly impacted by exposure time and
temperature. Refer to Table 11-1. The following basic precautions are common sense:
 Young children and elderly adults burn more quickly and should use cooler water.
 Never leave a child alone while drawing water in a bathtub.
 Test the water temperature before bathing or showering.
 Turn cold water on first and then add hot water until the temperature is comfortable.
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Legislation and Guidelines - At the time this document was written, standards and
guidelines regulating the prevention of Legionella in the United States and Canada were
mostly voluntary. The American Society of Heating, Refrigerating and Air-Conditioning
Engineers, Inc. (ASHRAE) is currently in the process of converting its guideline entitled
"Minimizing the Risk of Legionellosis Associated with Building Water Systems"
(ASHRAE Guideline 12-2000) into an official standard. Consult with your local
authorities as to recommended guidelines for controlling Legionella in potable water
systems.
Storing water at temperatures >140°F may not be permitted in some States, so check with
the authorities having jurisdictions. In Canada, recent changes to the National Plumbing
Code requires that domestic hot water be stored at or above 61oC (140oF) and then mixed
down to a safe temperature [49°C (120°F)] at the tank outlet (or point of use) using a
“Thermostatic Mixing Valve”; see Figure 11-1.
General Guidelines - In the absence of a National standard or local code, the following are general guidelines
for “good practice” on maintaining, monitoring and operating your potable water system:

Store domestic hot water at temperatures > 61oC (140oF).

Store and distribute cold water at temperatures below 20oC (68oF).

System supply for uses other than high temperature applications, typically greater than 46oC (115oF),
shall be equipped with a thermostatic mixing valve on the hot water outlet (or at point of use) to reduce
potential scald hazards.

Clean aerators and nozzles on water fixtures on a regular basis to reduce scale build-up.

Clean storage tanks and remove sediment. Flush storage tanks and piping systems regularly for 10-30
minutes at high water temperatures (depending on guidelines used) to rid the system of sediment and
scale that develops, typically in the bottom of storage tanks where water temperature is coolest; and
piping runs where water can stagnate.

Abandoned water lines should be capped off at the distribution main, not at the most convenient place.

Avoid dead-ends in piping system. If unavoidable, provide a drainage port in these areas at the lowest
point to flush out stagnant water regularly.

Insulate Domestic Hot Water piping and recirculation lines to R-2.6.

Insulate the last 5 ft of the cold water line entering the tank to R-2.6.

Keep pipe runs as short as possible to avoid unnecessary heat loss.

Recommend annual water testing of water in your tank and piping system(s) to monitor water
conditions.

Keep a maintenance record of when your indirect water heater and storage tank were cleaned, piping
systems flushed and who did the service work.
Table 11-1 How Water Temperature relates to Legionella and Scald Hazard
Water Temperature 1
Legionella Bacteria 1
Water Temperature 2,5
Exposure Time vs Burn 5
158-176oF
70-80oC
Disinfection range
158oF
70oC
1 second - 2nd or 3rd degree burn
o
o
o
o
140-149 F
60-65 C
Bacteria die within minutes
140 F
60 C
5 seconds - 2nd or 3rd degree burn
122-131oF
50-55oC
Bacteria die within hours
131oF
55oC
5 seconds - 1st degree burn
o
o
o
o
68-113 F
20-45 C
Bacteria thrive and multiply
122 F
50 C
1 minute - 1st degree burn
below 68oF below 20oC Bacteria is dormant
111oF
44oC
5 hours - 1st degree burn 3,4
Notes:
1
Published by Chartered Institute of Plumbing and Heating Engineering, Databyte series, "Safe Hot Water Temperatures."
2
The elderly and small children are susceptible to bad burns at shorter exposure times than listed in this table.
3
A thermostatic mixing valve should be installed on DHW storage tanks (or at point of use) when outlet temperatures
exceed 120oF [49oC].
4
Typical water temperature for bathing or showering range between 98-113oF [37-45oC].
5
Temperature-Time-Burn Chart published by John Hopkins University, excluding notes.
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12.0
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FIELD WIRING
All wiring must be in accordance with the Canadian Electrical code, CSA C22.2 and any applicable local codes.
Ensure that the wiring complies with this manual. The boiler must be electrically grounded in accordance with
the National Electrical Code ANSI/NFPA 70, local codes, and/or the Canadian Electrical Code CSA C22.1.
Avoid Shocks - To Avoid Electrical Shock, turn off electrical power to the boiler prior to
opening any electrical box within the unit. Ensure the power remains off while any
wiring connections are being made. Failure to follow these instructions may result in
component failure, serious injury or death.
Field Wiring - Wire grommets must be used to secure wiring and prevent chafing when
passing wiring through the cabinet wall. Failure to follow instructions may damage unit.
Wiring Connections
Electrical rating for the Vmax is 120V / 1 Phase / 60 Hz / 12A. All line voltage wiring connections to the Vmax are
made at the junction box on the control panel located at the bottom of the boiler cabinet. The connections are
accessed by removing the front door of the boiler, followed by the removal of the control panel cover; see Figure
12-1. Field wiring enters the cabinet through holes located on the bottom (underside) of the boiler cabinet; use
suitable strain-relief grommets to protect the wires. Field wiring connections are to be installed in accordance
with instructions provided in Figure 12-2 and Table 12-1.
Fuse (120VAC) - Vmax are equipped with a 3.15 Amp fuse located at “F1” on the boiler controller at the top
left; the fuse protects all 120VAC circuits within the boiler, as well as any circulators connected to it. A spare
fuse is located directly below the operating fuse in an open holder; see Figure 18-1.
Figure 12-1 Wiring Terminal Access
Wire Protection - When passing any wiring through the
cabinet of the boiler, the installer must use wire grommets
suitable for securing the wiring and preventing chafing. Failure
to follow instructions may result in component failure, serious
injury or death.
Field Wiring Terminals
Control Panel Cover
Power Supply - Vmax are designed to be powered using a single phase 120VAC power
supply that is fused (or protected via a circuit breaker) to allow a maximum of 15 Amps.
Failure to follow instructions may result in component failure, serious injury or death.
Labeling - Label all wires prior to disconnecting them when servicing controls. Wiring
errors can cause improper and dangerous operation. Failure to follow instructions may
result in property damage or personal injury.
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Continuity - Before connecting the line voltage wiring, perform a continuity check
between all wires and ground to make sure that there are no electrical leaks that could
blow a fuse or damage electrical components. Also check the polarity of the line and
neutral wires. Line must measure 120VAC to ground; neutral must measure zero. Failure
to follow instructions may damage the unit.
Max Load – The total load rating of circulators powered by outputs BOILER PUMP and
CH PUMP, or BOILER PUMP and DHW PUMP cannot exceed 2.6 Amps.
Table 12-1 Field Connections
Connection
Location
ARGUS LINK –
1
ARGUS LINK +
2
Argus Link Communication – used to cascade up to 16 boilers, also for connection to
USB interface for PC-connection and BMS Modbus/Expansion Interface Module.
COMMON
3
Sensor Common – Common port for field inputs SYSTEM, OUTDOOR and DHW.
4
System Temperature Sensor (Optional) – Wire to terminals 3 and 4 of the main boiler in
a cascade. Sensor would be installed on the system supply pipe feeding the Central
Heating system to allow accurate control of system temperature. Sensor is available from
NTI, p/n: 84010.
5
Outdoor Temperature Sensor – A wall mountable OD Sensor is included with each
boiler; connect to terminals 3 and 5. In a cascade, the OD Sensor only needs to be
connected to the main boiler. The use of the OD Sensor is required to allow the boiler
control to automatically infer the heat load of a central heating system.
6
Tank Thermostat / Sensor – Connect the contacts of a DHW Tank Thermostat, or leads
of an approved DHW Tank Sensor (NTI p/n: 84632), to terminals 3 and 6. When using a
Thermostat, set DHW mode = 2 (menu setting 2-08). When using a Sensor, set DHW
mode = 1. A Tank Sensor is factory wired to terminals 3 and 6 on Vmax Plus models
(VM110P and VM153P). See Section 17.0 for more details.
SENSOR
SYSTEM
OUTDOOR
DHW
7
THERMOSTAT
8
9
EXT. LIM
10
Description
24VAC Room Thermostat Input – Connect central heat demand switch (room
thermostats or zone control end switch), or “nighttime setback” / “time of day” switch to
terminals 7 and 8. Switch must be an isolated end switch.
120VAC Safety Limit Circuit (Factory jumpered) – wire the output contacts of any
optional external limit device (i.e. LWCO) in series with terminals 9 and 10. Note: if using
an external limit device, the factory jumper must be removed.
DHW PUMP
11
120VAC output to the DHW circulator; powered during a demand for DHW. Total load
of DHW PUMP and BOILER PUMP must not exceed 2.6Amps. Not applicable for Vmax
Plus models (VM110P and VM153P).
CH PUMP
12
120VAC output to the Central Heating circulator; powered during a demand for Central
Heat. Total load of CH PUMP and BOILER PUMP must not exceed 2.6Amps. Note: the
VM110 internal pump is wired to this output.
BOILER PUMP
13
120VAC output to the main boiler circulator; powered during all demands. Total load of
BOILER PUMP and CH PUMP (or DHW PUMP) must not exceed 2.6Amps. Note: the
internal pump of models VM110P, VM153 and VM153P is factory wired to this output.
14
L2 NEUTRAL
Location for connecting neutral of the power supply and all circulators.
15
L1 120VAC
16
Ground
Green
Wire
Location for connecting line voltage of the power supply. Note; most installation codes
require the installation of a service switch to break line voltage to the appliance.
Location for connecting earth ground and for grounding all circulators.
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Figure 12-2 Field Wiring
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│Cascade Instructions
Vmax I&O Manual
13.0
CASCADE INSTRUCTIONS
The Vmax controller has the internal capacity to cascade (lead-lag / stage) up to 16 Vmax boilers, without the use
of an external controller. Use the instructions detailed in this section to set-up and install the cascade system.
Vmax Plus (VM110P & VM153P) – cascades heating an IWH cannot utilizes a Vmax
Plus as the Manager.
VM110 & VM153 (Manager) – when configured as the Manager, non-Plus models
VM110 and VM153, must have the local boiler pump powered by the respective boiler’s
BOILER PUMP output. Furthermore, model VM110 must also have the internal pump
rewired to the BOILER PUMP output (factory wiring is to the CH PUMP output).
Figure 13-1 Cascade Plumbing Schematic
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Cascade Instructions │
Vmax I&O Manual
Communication Wiring – for each boiler in the cascade, wire in parallel electrical connections Argus Link (-)
and Argus Link (+), terminals 1 and 2 (see Figure 12-2).
Establish Managing Boiler – choose one boiler to be the Managing Boiler, this boiler will receive all control
wiring and will be used for setting control parameters (see steps below). All non-Managing Boilers
(Dependents) must have the “S4” switch (located on the top right side of the control) switched OFF. *
*Note: the “S4” switch is factory set to ON. The switch is in the off position when it is closest to the “S4”
marking. The “S4” switch must remain in the ON position on the Managing Boiler.
Plumbing – install the boilers in parallel in a primary/secondary plumbing configuration as illustrated in Figure
13-1.
System Sensor – install a system sensor (NTI p/n: 84010) on the outlet (supply) pipe feeding the heating system,
see Figure 13-1. Wire the system sensor to terminals 3 and 4 of the Managing Boiler (left boiler in
illustration).
IMPORTANT: the use of the system sensor is mandatory for proper operation of the boiler cascade system.
Outdoor Sensor – when using an outdoor sensor it must be connected to terminals 3 and 5 of the Managing
boiler (left boiler in illustration); outdoor sensors connected to non-Managing boilers will be ignored.
Boiler Pump – each boiler in the cascade must have its own circulator, powered by the respective boiler (see
Figure 13-1). The boiler model, and function in the cascade (i.e. Manager or Dependent), will determine
which pump output (CH or BOILER) needs to power the boiler pump.
 VM110 & VM153 (Manager) – when configured as the Manager, non-Plus models VM110 and VM153,
must have the local boiler pump powered by the respective boiler’s BOILER PUMP output. Furthermore,
model VM110 must also have the internal pump rewired to the BOILER PUMP output (factory wiring is
to the CH PUMP output).
 VM110 & VM153 (Dependent) – when configured as Dependents, the local boiler pump must be
powered by the respective boiler’s CH PUMP output.
 VM110P (Manager/Dependent) – does not require the installation of a separate boiler pump, instead, the
internal circulator is utilized by NOT installing the external Primary Loop Manifold at the bottom of the
boiler.
 VM153P (Manager/Dependent) – the local boiler pump must be powered by the boiler’s CH PUMP
output.
CH Pump (System) – the Managing Boiler can control the System’s Central Heating Pump via its CH PUMP
output (terminal 12). IMPORTANT: due to the limited switching capacity of the CH PUMP output, it may be
necessary to use an isolation relay to activate the CH Pump, see Table 12-1.
DHW Pump (System) – the Managing Boiler can control the System’s DHW Pump via its DHW PUMP output
(terminal 11). IMPORTANT: due to the limited switching capacity of the DHW PUMP output, it may be
necessary to use an isolation relay to activate the DHW Pump, see Table 12-1.
Central Heat Demand Switch (Room Thermostat) – connect to terminals 7 and 8 (T, T) of the Managing
Boiler. Switch must be an isolated end switch (dry contact). Central Heat settings are programed from the
Managing Boiler only, i.e. Installer menu settings 2-01, 2-02, 2-03, 2-04, 2-05 and 2-06.
Tank Thermostat / Sensor – connect to terminals 3 and 6 of the Managing Boiler. DHW settings are programed
from the Managing Boiler only, i.e. Installer menu settings 2-07, 2-08 and 2-09. Set DHW Mode (Installer
menu setting 2-08) according to device used; Thermostat = 2, Sensor = 1.
Boiler Address – assign a unique boiler address for each boiler in the cascade via Installer menu setting 2-20.
Managing boiler must be set = 1; other boilers must be set from 2 to 16.
Rotation Interval – establishes the time, in days, between advancements of the staging sequence of boilers in the
cascade; set via Installer menu setting 2-22 of the Managing Boiler.
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Vmax I&O Manual
│Cascade Instructions
Emergency Setpoint – establishes an emergency (back-up) boiler operating setpoint in the event communication
is lost between boilers, or if the system sensor is not connected. Set via Installer menu setting 2-21 of each
boiler in the cascade.
VM153 Internal Diverter Valve – when acting as Manager in a cascade heating an
Indirect Water Heater, the internal diverter valve of the VM153 must be “locked” in the
Central Heating position. Simply remove any DHW demand from the boiler, apply a
Central Heat demand, watch the diverter valve move to the Central Heat position
(actuator shaft retracted), then remove the electrical cable from the actuator – now the
diverter valve is “locked” in the Central Heating position.
59
Wiring Schematics │
14.0
Vmax I&O Manual
WIRING SCHEMATICS
Figure 14-1 Vmax Connection Diagram
60
│Wiring Schematics
Vmax I&O Manual
Figure 14-2 Vmax Ladder-Logic Diagram
61
Wiring Schematics │
Vmax I&O Manual
15.0 INSTALLATION CHECKLIST
Installation
 1. If operating on Propane Gas, convert boiler using appropriate Conversion Kit. See Table 7-1.
 2. Locate the boiler in accordance with Section 3.0 of this manual.
 3. Install the Vent/Air-inlet piping in accordance with Sections 4.0 and 5.0 of this manual. Ensure all joints
are secured and cemented properly. Perform the Mandatory Pre-commissioning Procedure for Plastic
Venting in Section 4.0.
 4. Connect the condensate trap and drain in accordance with Section 6.0 of this manual.
 5. Connect the gas supply in accordance with Section 7.0 of this manual.
 6. Install the plumbing in accordance with this manual. Flush/cleanse the internals of the heating system.
Treat system water with Fernox F1 Protector when needed.
 7. Connect field wiring in accordance with Section 12.0 of this manual.
 8. Advise home/building owner of their responsibilities with respect to maintaining the boiler.
The building owner is responsible for keeping the Vent/Air-inlet termination free of snow,
ice, or other potential blockages and for scheduling boiler routine maintenance as
described in the next section. Failure to properly maintain the boiler may result in serious
injury or death.
Start-up
Allow primers/cements to cure for 8 hours prior to Start-up. If curing time is less than 8
hours, first perform Steps 2 through 6 of Mandatory Pre-commissioning Procedure for
Plastic Venting in Section 4.0. Failure to follow these instructions can result in explosion,
serious injury or death.




1.
2.
3.
4.
Turn gas shut-off valve to the ON position.
Turn Power on to the boiler.
Set Controller to the desired settings.
Turn thermostat up, Ignition will occur.
Operational Checklist
 1. System is free of gas leaks.
 2. System is free of water leaks.
 3. Water pressure is maintained above 15 PSI.
 4. All air is purged from the heating system piping.
 5. Ensure proper water flow rate; unit must not kettle, bang, hiss or flash the water to steam.
 6. Ensure gas line pressure is in accordance with Section 9.0.
 7. System is free of combustion leaks.
 8. Unit must operate smoothly.
 9. Ensure the flue gas combustion readings are within the tolerances listed in Table 9-1.
 10. Each ignition must be smooth.
 11. Verify that all condensate lines are clean and drain freely.
Before Leaving
 1. Remove line pressure gauge from gas valve, tighten bleed screw, test screw for leaks. See Section 9.0.
 2. Install plug into the flue gas test port and test for leaks, see Section 9.0.
 3. Allow the boiler to complete at least one heating cycle, or to operate for at least 15 minutes.
 4. Always verify proper operation after servicing.
Instructions to Installing Contractor
 1. Ensure that the customer receives the Warranty Documentation included with the installation manual.
 2. Leave the manual with the customer so they know when to call for annual maintenance and inspection.
This boiler must have water flowing through it whenever the burner is firing. Failure to
comply may damage the unit, void the warranty, and cause serious injury or death.
Allowing the boiler to operate with a dirty combustion chamber will adversely affect its
operation and void the warranty. Failure to clean the heat exchanger on a frequency that
matches the need of the application may result in fire, property damage, or death.
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Annual Maintenance and Inspection │
16.0
Vmax I&O Manual
ANNUAL MAINTENANCE AND INSPECTION
This unit must be inspected at the beginning of every heating season by a Qualified Technician.
Annual Inspection Checklist
 1. Lighting is smooth and consistent, and the combustion fan is noise & vibration free.
 2. The condensate drain flows freely, and is cleaned of sediment.
 3. Relief Valve and air vents are not weeping.
 4. Low water cut device off is tested.
 5. Examine all venting for evidence of leaks. Ensure vent screens are cleaned and clear of debris.
 6. Check the burner plate for signs of leaking.
 7. The combustion chamber must be inspected and if necessary cleaned.
 8. Keep boiler area clear/free from combustible materials, gasoline, and other flammable vapors and liquids.
 9. Ensure there is nothing obstructing the flow of combustion and ventilation air.
 10. Listen for water flow noises indicating a drop in boiler water flow rate.
Important - The hydronic system may need to be flushed to eliminate hard water scale
(Use Fernox DS-40 Descaler, NTI PN: 83450).
 11. Verify proper operation after servicing.
Wiring Labels - Label all wires prior to disconnection when servicing controls. Wiring
errors can cause improper and dangerous operation.
Cleansers and Potable Water - Boiler system cleansers and corrosion inhibitors must not
be used to flush contaminants from water heaters or potable water systems.
Combustion Chamber Cleaning Procedure
The combustion chamber must be cleaned after the first year of operation, with subsequent cleanings scheduled
based on the condition of the combustion chamber at the time of the first cleaning. Units operating with LP Gas
or in an industrial environment may require more frequent cleanings.
Crystalline Silica - Read carefully the warnings and handling instructions pertaining to
Refractory Ceramic Fibers before commencing any service work in the combustion
chamber. Take all necessary precautions and use recommended personal protective
equipment as required.
Cleaning Checklist
 1. Remove the demand for heat, allow the post-purge cycle to finish, turn gas and power supply off.
 2. Working inside the cabinet, swing the control panel out of the way, disconnect the cabling to the
combustion blower, gas valve, spark igniter and flame sensor, then remove the air-inlet and gas supply
piping.
 3. Once the combustion chamber has cooled, remove the four (4) nuts securing the burner assembly to the
heat exchanger, then remove the assembly (burner door, blower and gas valve) – be careful not to damage
the insulation disc located behind the burner door. Replace insulation if it is damaged.
 4. Inspect the condition of the insulation at the back of the chamber; cover it to protect it from becoming wet
during the cleaning process. If the insulation is damaged, remove it and install new insulation once the
heat exchanger cleaning is complete.
 5. Use a vacuum with a high efficiency filter to remove any loose debris or dust.
 6. Remove the condensate trap from the bottom of the boiler and place a drain under the boiler condensate
drain.
 7. Wet the inside of the combustion chamber with warm water (do not use any chemicals). Use a garden hose
with a trigger nozzle to direct pressurized water between the heat exchanger tubes; the water will exit via
the condensate drain on the bottom. Continue process until the gaps between the tubes are clear and the
water runs clean. Use dry rags or plastic to protect electrical components from being damaged by dripping
or spraying water.
 8. Disassemble the condensate trap and thoroughly clean it; then reassemble and securely connect it to the
boiler condensate drain, see Section 6.0.
 9. Reassemble the boiler in the reverse order of disassembly.
 10. Perform the Start-up and Operational Checklist detailed in the previous section.
Replace any gaskets or insulation discs that show any signs of damage and do not re-use.
Failure to follow these instructions may result in fire, property damage or death.
63
Vmax I&O Manual
Annual Maintenance and Inspection
Refractory Ceramic Fibers (RFC)
Personal Protective Equipment Recommended - Read the following warnings and
handling instructions carefully before commencing any service work in the combustion
chamber. The insulating material on the inside of the burner plate contains Refractory
Ceramic Fibers and should not be handled without personal protective equipment.
Potential Carcinogen - Use of Refractory Ceramic Fibers in high temperature
applications (above 1000oC) can result in the formation of Crystalline Silica
(cristobalite), a respirable silica dust. Repeated airborne exposure to crystalline silica
dust may result in chronic lung infections, acute respiratory illness, or death. Crystalline
silica is listed as a (potential) occupational carcinogen by the following regulatory
organizations: International Agency for Research on Cancer (IARC), Canadian Centre
for Occupational Health and Safety (CCOHS), Occupational Safety and Health
Administration (OSHA), and National Institute for Occupational Safety and Health
(NIOSH). Failure to comply with handling instructions in Table 16-1 may result in
serious injury or death.
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 Table 16-1 for handling instruction 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).
Table 16-1 Handling Instructions for Refractory Ceramic Fibers (RCF)
Reduce the Risk of Exposure
Precautions and Recommended Personal Protective Equipment
Avoid contact with skin and eyes  Wear long-sleeved clothing, gloves, and safety goggles or glasses.
 Wear a respirator with an N95-rated filter efficiency or better. 1
Avoid breathing in silica dust
 Use water to reduce airborne dust levels when cleaning the combustion chamber.
 Do not dry sweep silica dust. Pre-wet or use a vacuum with a high efficiency filter.
 When installing or removing RFCs, place the material in a sealable plastic bag.
Avoid transferring contamination
 Remove contaminated clothing after use. Store in sealable container until cleaned.
 Wash contaminated clothing separately from other laundry.
If irritation persists after implementing first aid measures consult a physician.
 Skin - Wash with soap and water.
First Aid Measures
 Eyes - Do not rub eyes; flush with water immediately.
 Inhalation – Breathe in fresh air; drink water, sneeze or cough to clear irritated
passage ways.
Notes:
1
Respirator recommendations based on CCOHS and OSHA requirements at the time this document was written. Consult
your local regulatory authority regarding current requirements for respirators, personal protective equipment, handling,
and disposal of RCFs.
For more information on Refractory Ceramic Fibers, the risks, recommended handling procedures and
acceptable disposal practices contact the organization(s) listed below:
Canada (CCOHS): Telephone directory listing
under Government Blue Pages Canada—Health and
Safety—Canadian Centre for Occupational Health
and Safety; or website http://www.ccohs.ca.
64
United States (OSHA): Telephone directory listing
under United States Government—Department of
Labor—Occupational Safety and Health
Administration; or website http://www.osha.gov.
│Display Menu Guide
Vmax I&O Manual
17.0
DISPLAY MENU GUIDE
Initial Power-up
Immediately following power-up of the boiler, the display reads, “conn”, indicating it is connecting to the
controller; this is followed by a momentary reading of the display software version, e.g. init d349. After which the
controller performs a de-air sequence that is designed to purge air from the boiler water. The de-air sequence
cycles the circulators off and on, for a period of 14 minutes, in an attempt to free air pockets that may exists in the
heat exchanger and boiler piping.
The de-air sequence is initiated following each power-up of the boiler; if air has already
been adequately purged from the system the de-air sequence can be stopped by holding
the OK button until “dAir” is no longer displayed on the screen, see Figure 17-1.
The de-air sequence is designed to remove air from the system; failure to adequately
remove air from the system can damage the heat exchanger and void the warranty, and
may lead to property damage and personal injury.
Figure 17-1 de-Air Sequence
dAir – indicates the
boiler is performing
the de-Air sequence.
Temperature unit
Boiler outlet
temperature
Ok button – press and
hold to skip the de-Air
sequence.
Main Screen
Following power-up of the boiler (after the de-air sequence), or after 60 seconds of inactivity (no buttons
pressed), the boiler defaults to the Main Screen, see Figure 17-2. Under normal operating conditions the Main
Screen displays the boiler outlet temperature and water pressure, as well as an indication of the current heat
demand (CH or DHW), burner status and outdoor reset function. See Figure 17-2 for more details.
User Menu access – from the Main Screen, access to the User Menu is accomplished simply by pressing the UP
or DOWN button on the console; see User Menu section below for more details.
Installer Menu access – from the Main Screen or User Menu, access to the Installer Menu is accomplished by
pressing and holding the MENU and OK buttons simultaneously; see Installer Menu section below for more
details.
Return to Main Screen – from the User Menu, return to the Main Screen by pressing the OK button. From the
Installer Menu, return to the Main Screen by pressing and holding the RESET button.
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Display Menu Guide │
Vmax I&O Manual
Figure 17-2 Control Console – Main Screen
Water pressure
Temperature units
Water pressure units
Boiler outlet
temperature
Faucet – flashes
during DHW demands
OD reset indicator –
illuminates when OD
sensor is enabled
No flame – displayed
during lockout or error
Radiator – flashes
during CH demands
Wrench – displayed
when installer settings
are accessed
Up button
Flame – displayed
when flame is on
Menu button
Reset button – press
and hold to clear
lockouts or exit Installer
Menu
Down button
Ok button – select to
exit User Menu
Power button
User Menu
The User Menu allows for easy viewing of the current boiler operating conditions, including pump status, sensor
inputs, common set points, and boiler target temperature. Access the User Menu from the Main Screen by
pressing the UP or DOWN button on the display console. Exit the User Menu by pressing the OK button.
The User Menu only permits the user to view boiler information; editing of settings must
be done from the Installer Menu. Access the Installer Menu by pressing and holding the
MENU and OK buttons simultaneously; see Installer Menu section for more details.
Figure 17-3 User Menu Navigation
Units (if applicable)
Item ID # - 14
parameters can be
viewed from the User
Menu (1-01 to 1-14),
see Table 17-1 for
description of each
Ok button – press to
return to Main Screen
66
Value of displayed
parameter
Up button – press to
scroll up through the
menu parameters
Down button – press
to scroll down through
the menu parameters
│Display Menu Guide
Vmax I&O Manual
Table 17-1 User Menu
Menu Item
Description
1-01
Current target temperature – displays the current target temperature of the boiler outlet sensor for the
active demand (DHW or Central Heating). For central heating with outdoor reset, the calculated central
heating target temperature will be displayed. The Manager boiler of a cascade system, will display the
target temperature for the system.
1-02
CH setpoint (at OD = 0⁰F) – displays the maximum central heat setpoint, set via Installer Menu setting 201. Setting establishes the boiler operating temperature during central heat demands when the outdoor
temperature is 0⁰F or less.
1-03
1-04
1-05
1-06
1-07
1-08
1-09
1-10
1-11
1-12
1-13
1-14
DHW temperature – displays the temperature reading from; (i) Tank Sensor (NTI p/n: 84632) located in
an external IWH or (ii) Tank Sensor (NTI p/n: 85139) located on the internal the IWH of a Vmax Plus
boiler. When no sensor is used, “OPEn” indicates an open circuit, and “CLOS” indicates a closed circuit –
i.e. contact closure from an IWH thermostat. See Table 18-1, Thermistor Resistence vs. Temperature.
DHW setpoint – displays the DHW setpoint, set via Installer Menu setting 2-07.
DHW flow rate (USGPM) – Not Applicable for Vmax boilers
Fan speed actual (rpm) – displays speed at which the combustion blower is operating.
Flame signal (µA) – displays the flame strength signal sensed from the ionization electrode, NTI p/n:
84740; minimum signal to sustain normal burner operation is 3µA. Burner operation is completely
prohibited when the signal drops below 1.5µA.
Outdoor sensor temperature – displays reading from outdoor temperature sensor, NTI p/n: 83604.
NOTICE: when sensor is open (not connected) display indicates -40⁰F/C or “OPEn”; when sensor is
shorted display indicates 176⁰F/80⁰C or “OPEn”. See Table 18-1, Thermistor Resistence vs. Temperature.
Return sensor temperature – displays reading from boiler inlet temperature sensor, NTI p/n: 84745.
Flue sensor temperature – displays reading from boiler flue temperature sensor, NTI p/n: 83608. Burner
operation is inhibited when the flue temperature reading is in excess of 205⁰F. NOTICE: an open circuit is
displayed as 50⁰F/10⁰C and a blocking error “Err 78” occurs; a short circuit is displayed as 278⁰F/137⁰C
and a blocking error “Err 86” occurs. See Table 18-1, Thermistor Resistence vs. Temperature.
Boiler pump – indicates the status (On/Off) of the Boiler Pump output. Note: the Boiler Pump output is on
during all demands.
Central heat pump – indicates the status (On/Off) of the CH Pump output. Note: the CH Pump output is
on during central heat demands; the CH Pump will turn off during priority DHW demands.
DHW pump – indicates the status (On/Off) of the DHW Pump output. Note: the DHW Pump output is on
during priority DHW demands.
System sensor temperature – for use only in cascade systems, displays reading from a system temperature
sensor, NTI p/n: 84010. When used, the system sensor is only wired to the managing boiler, i.e. boiler with
S4 switch set to on, and boiler address (Installer Menu setting 2-20) set to 1. NOTICE: an open circuit is
displayed as “OPEn”; a short circuit is displayed as “CLOS”. See Table 18-1, Thermistor Resistence vs.
Temperature.
Notes:
1
Enter User Menu by pressing the UP or DOWN button; to scroll through menu options, continue pressing the UP or
DOWN button.
2
Exit User Menu by pressing the OK button.
3
User Menu is for viewing only; to adjust settings refer to the Installer Menu.
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Display Menu Guide │
Vmax I&O Manual
Installer Menu
The Installer Menu allows access to all settings for adjustment, as well as viewing of statistical data for
troubleshooting. Access the Installer Menu from any screen by pressing the MENU and OK buttons
simultaneously until “2-01” is displayed on the top left of the screen. Exit the Installer Menu by pressing and
holding the RESET button.
Installer Menu settings shall only to be adjusted by a qualified installer or service
technician that understands the repercussions of incorrect control settings. Improper
control settings may negatively affect the operation of the boiler and/or the heating
system; resulting in property damage, serious injury or even death.
Adjusting settings – once the Installer Menu is accessed; adjust settings using the following procedure:
1. Use the UP or DOWN button to scroll through the menu until the desired setting number is displayed in the
top-left of the screen (i.e. 2-01).
2. Press the OK button to access the setting; at this time the setting will flash (Note: if the value does not flash
after pressing the OK button, then the parameter is not adjustable – refer to Table 17-2).
3. With the value flashing, use the UP or DOWN button to increase or decrease the setting. Once the desired
value is displayed, press the OK button to enter/save the new value. At this point the value will stop flashing.
4. Repeat for the next setting. Once complete, return to the Main Screen by holding the RESET button.
Figure 17-4 Installer Menu Navigation
Units (if applicable)
Item ID # - 35
parameters can be
viewed and/or adjusted
from the Installer Menu
(2-01 to 2-35), see
Table 17-2 for
description of each.
Value of displayed
parameter
UP button – press to
scroll up through the
menu parameters, or to
increase selected
setting.
Installer Menu
Access – press and
hold MENU and OK
buttons to enter
Installer Menu.
OK button – press to
select parameter for
adjustment. Press
again to save new
setting.
Installer Menu Exit –
press and hold the
RESET button to exit
the Installer Menu.
Down button – press
to scroll down through
the menu parameters,
or to decrease selected
setting.
Table 17-2 Installer Menu
Setting
Description
Factory
Setting
2-01
CH setpoint (at OD = 0⁰F) – establishes the boiler operating temperature during central heat
demands when the outdoor temperature is 0⁰F or less. Set to the maximum desired boiler temperature
for the application, e.g. 100-120⁰F for infloor; 140-160⁰F for cast-iron; 160-190⁰F for baseboard.
Range = 80 to 190⁰F
140⁰F
2-02
CH setpoint differential – establishes how much the boiler outlet temperature must exceed the CH
setpoint before the burner is turned off. Also establishes how much the boiler outlet temperature must
drop below the CH setpoint before the burner is turned on. Range = 3 to 36⁰F
9⁰F
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│Display Menu Guide
Vmax I&O Manual
Setting
2-03
2-04
Description
CH mode – determines the operational mode for central heating:
 0 – no outdoor sensor is needed; central heat demand is generated by a thermostat call to
boiler terminals 7 and 8. Boiler operates to setting 2-01; there is no outdoor reset.
 1 – outdoor sensor is needed; central heat demand is generated by a thermostat call to boiler
terminals 7 and 8. Boiler operates in-between settings 2-01 and 2-05 depending on OD temp.
 2 – outdoor sensor is needed; central heat demand is generated when the OD temp is below
the Warm weather shutdown setting (2-04). Boiler operates in-between settings 2-01 and 205 depending on OD temp. An optional “nighttime setback” or “time of day” switch can be
applied to terminals 7 and 8; contact closure initiates “Night Setback Mode”, where the boiler
target temperature is reduced by the Night Setback Temperature setting (2-33).
 3 – N/A
 4 – setpoint from external analog input (0-10VDC); 2 volts for minimum CH setpoint, 10
volts for maximum CH setpoint. Use of an addition interface board through Argus Link is
required.
 5 – modulation from external analog input (0-10VDC); 2 volts for minimum modulation, 10
volts for maximum modulation. Use of an addition interface board through Argus Link is
required.
Warm weather shutdown – inhibits central heat operation when the outdoor temperature reading goes
above this setting. Range = 35 to 100⁰F
Factory
Setting
1
100⁰F
2-05
CH setpoint (at OD = 70⁰F) – establishes the boiler operating temperature during central heat
demands when the outdoor temperature is 70⁰F or greater. Set to the minimum desired boiler
temperature for the application, e.g. 70-90⁰F for infloor; 100-120⁰F for cast-iron; 110-140⁰F for
baseboard. Range = 60 to 140⁰F
95⁰F
2-06
Temperature boost – determines the increase in boiler target temperature for every 15 minutes of
continuous central heat demand. Only applicable when an outdoor sensor is used (i.e. CH modes 1 &
2). Target temperature will not exceed CH setpoint setting 2-01. Range = 0 to 36⁰F
0⁰F
2-07
DHW setpoint – establishes: a) tank temperature setting for DHW mode 1 [e.g. 130-140⁰F], when
using a tank sensor, or b) boiler outlet setpoint for DHW mode 2 [e.g. 170-190⁰F]. Note: Vmax Plus
models must have DHW mode = 1, i.e. Tank sensor. Range = 104-190⁰F
136⁰F
2-08
2-09
2-10
2-11
2-12
2-13
DHW mode – determines the operational mode for DHW; for VM110 and VM153 models choose
between options 0, 1 and 2; for VM110P and VM153P models choose between options 0 and 1:
 0 – off; boiler will not attempt to heat DHW in any way.
 1 – control anticipates a reading from a Tank Sensor wired to terminals 3 and 6; tank
temperature is controlled by the boiler via setting 2-07 (mandatory for VM110P and
1 or 2
VM153P).
 2 – control anticipates an open/closed input from a tank thermostat wired to boiler terminals 3
and 6. Setting 2-07 determines boiler outlet temperature during DHW demands. (Default
setting for VM110 and VM153 – not applicable for VM110P and VM153P models)
 3, 4 & 5 – settings are not applicable for Vmax boilers.
DHW priority timer – a timer that accumulates during a simultaneous DHW and CH demand. Each
time the timer exceeds the “DHW priority timer” setting, the priority switches from one demand to the 60 min
other (i.e. DHW to CH). Note: DHW is assigned priority first. Range = 1-240 minutes
Preheat mode – Not Applicable for Vmax boilers
OFF
Appliance selection (type) – indicates what boiler model the controller is configured to operate with:
 8 = VM110
 11 = VM153 (NG)
8, 9, 10,
11, 13 or
 9 = VM110P
 13 = VM153 (LP)
14
 10 = VM153 (NG)
 14 = VM153P (LP)
(See Section 17.0 for instruction on changing the appliance selection (type)).
Minimum firing rate – allows the installer to increase the minimum modulation/firing rate of the
20%
boiler; this may be necessary for troubleshooting. Range = 20-44%
Maximum firing rate CH – allows the installer to decrease the maximum modulation/firing rate of
the boiler when operating on a central heat demand; this may be necessary for troubleshooting or de100%
rating the boiler for operation with glycol. Range = 60-100%
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Display Menu Guide │
Setting
2-14
2-15
2-16
2-17
2-18
2-19
2-20
2-21
2-22
2-25
2-26
2-27
2-28
2-29
2-30
Vmax I&O Manual
Description
Maximum firing rate DHW – allows the installer to decrease the maximum modulation/firing rate of
the boiler when operating on a domestic hot water demand; this may be necessary for troubleshooting
or de-rating the boiler for operation with glycol. Range = 60-100%
Firing rate test – allows the installer to force maximum or minimum modulation rates for the purpose
of troubleshooting and burner setup (i.e. combustion analysis):
 0 = Automatic; burner modulation is controlled by the controller.
 1 = Minimum; burner operates at the minimum modulation rate.
 2 = Ignition; burner operates at the ignition/light-off modulation rate.
 3 = Maximum; burner operates at the maximum modulation rate.
Note: control will end test (return setting to 0) if the boiler outlet temperature exceeds 176⁰F. Return
setting to 0 when testing is complete.
Service reminder status – a service reminder, indicated by “Att 7” on the screen, occurs every 365
days. The service reminder is reset by adjusting 2-16 to “OFF”.
Cascade pump postpurge – length of time the pumps remain powered at the end of a cascade DHW
or CH demand. Applicable to the Manager only. Timer commences immediately following the end of
the cascade demand, and will be overridden by a longer CH or DHW pump postpurge time.
Range = 10-90seconds
CH pump postpurge – length of time the CH & Boiler Pumps remain powered at the end of a central
heat demand. Timer commences following the combustion fan postpurge. Range = 0-90seconds
DHW pump postpurge – length of time the DHW & Boiler Pumps remain powered at the end of a
DHW demand. Timer commences following the combustion fan postpurge. Range = 0-255seconds
Cascade boiler address – assign a unique boiler address for each boiler in a cascade; managing boiler
address must be set to 1. Managing boiler must have S4 switch set to ON; all others must be set to
OFF. Central heat and DHW demands and setpoints are received and set at the managing boiler only.
A boiler that is not part of a cascade must have the boiler address set to 0. Range = 0-16
Emergency setpoint – used only for a cascade system, assigns a permanent boiler operating
temperature that is used if communication between boilers is lost, or if the system temperature sensor
becomes disconnected. Must be set on each boiler in the cascade. Range = 104-190⁰F
Rotation interval – establishes the time between the rotation of start and stop sequences of boilers in
a cascade. Range = 0-30days (0=disable)
Flame failures – accumulation of the number of flame outages that occurred during run.
Ignition attempts success – accumulation of the number of successful ignitions.
Ignition attempts failed – accumulation of the number of failed ignition attempts.
Run time CH – accumulation of the number of hours that the burner has been firing for the purpose
of central heating.
Run time DHW – accumulation of the number of hours that the burner has been firing for the purpose
of DHW.
Post purge time – length of time the combustion blower operates at the end of a burner sequence.
Recommend increasing post purge time for installations with long exhaust venting.
Range = 5-60seconds
Factory
Setting
100%
0
OFF
30 sec
30 sec
10 sec
0
113⁰F
5 days
NA
NA
NA
NA
NA
60 sec
2-31
Units selection – allows the installer to select US or metric units. Range = ⁰F or ⁰C
⁰F
2-32
External Ignition – determines the power source for the igniter spark. Parameter must be set to On.
Night Setback Temperature – applicable only when CH mode is set to 2 (menu setting 2-03),
determines the reduction in boiler target temperature during “Night Setback Mode”, i.e. when
terminals 7 and 8 receive a demand (contact closure) from a “nighttime setback” or “time of day”
switch. Range = 0-54⁰F
On
2-33
2-34
2-35
70
Lockout History – displays the last 16 lockouts (Loc) and the time interval between each. The most
recent lockout is displayed first; see description below.
Blocking Error History – displays the last 16 blocking errors (Err) and the time interval between
each. The most recent error is displayed first; see description below.
15⁰F
NA
NA
│Display Menu Guide
Vmax I&O Manual
Lockout & Error History
The Vmax controller stores in its memory the 16 most recent Lockouts (Loc) and Blocking Errors (Err); these
errors can be accessed from the Installer Menu via settings 2-34 (Lockout History) and 2-35 (Blocking Error
History). The History submenus indicate which Lockout or Error occurred, and the time interval between each
occurrence. Navigate the Lockout and Error History submenus as follows:
1. Navigate to Installer Menu setting 2-34 (Lockout History) or 2-35 (Blocking Error History). From this
screen the display indicates how long ago the most recent error occurred; see Figure 17-5(a).
2. Press the “OK” button to display the most recent error, and the time between it and the preceding error;
see Figure 17-5(b).
3. Press the UP button to display the next most recent error, and time between it and the preceding error; see
Figure 17-5(b). When you have reached the end of the recorded errors, the display will indicate “End 0.”
To exit the History submenu, press the “OK” button; see Figure 17-5(c).
Figure 17-5(a) Lockout and Error History Navigation
Time (in min.) since the
most recent lockout or
error occurred. If
followed by “d”, the
number is an indication
of how many days (e.g.
7 days).
2-34 (Loc History)
or
2-35 (Err History)
OK button – press to
view the most recent
Lockout or Error.
Figure 17-5(b) Lockout and Error History Navigation (Submenu)
Lockout / Error –
indicates the applicable
error code, e.g. Loc 1.
Time (in min.) since the
preceding lockout or
error. If followed by “d”,
the number is an
indication of how many
days (e.g. 21 days).
UP button – press to
view the preceding
lockout or error.
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Display Menu Guide │
Vmax I&O Manual
Figure 17-5(c) Lockout and Error History Navigation (End)
End – indicates that you
have reached the end of
the recorded lockout or
error messages.
OK button – press to
exit the 2-34 or 2-35
History submenu.
Lockouts
A lockout is indicated when “Loc” is displayed at the top-left of the screen; the specific lockout code/number is
displayed in large text to the right, see Figure 17-6. Some lockouts (e.g. Loc 1 and 2) are considered “hard
lockouts,” meaning the lockout cannot be cleared by cycling the power supply off and on; the lockout can only be
cleared by pressing and holding the RESET button on the display console. While the boiler is in lockout, the User
and Installer Menus are still accessible as before, and may be accessed to identify boiler sensor readings and
settings.
Figure 17-6 Lockout Navigation
Loc – indicates the
boiler is in lockout.
Installer Menu –
press and hold MENU
and OK buttons to
view settings.
Clear Lockout –
press and hold the
RESET button to clear
the lockout.
Lockout code - see
Table 17-3 for
description
User Menu – press the
UP or Down button to
view boiler parameters.
Blocking Errors
A blocking error is indicated when “Err” is displayed at the top-left of the screen; the specific error code/number
is displayed in large text to the right, see Figure 17-7. Blocking errors are only displayed while a problem exists;
during which time the burner is not permitted to operate. To clear a blocking error the problem must be corrected,
i.e. the blocking error will not be cleared by cycling the power off and on, or by pressing the RESET button.
While the blocking error is display, the User and Installer Menus are still accessible as before, and may be
accessed to identify boiler sensor readings and settings.
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│Display Menu Guide
Vmax I&O Manual
Figure 17-7 Blocking Error Navigation
Err – indicates the
boiler has a blocking
error.
Error code - see Table
17-3 for description.
Installer Menu – press
and hold MENU and
OK buttons to view
settings.
User Menu – press the
UP or Down button to
view boiler parameters.
Fill – Low Water Pressure
The Vmax boiler is equipped with a water pressure sensor located in the return piping inside the boiler cabinet,
see Figure 19-1(e), item 24 for sensor location; the reading from the sensor is displayed on the Main Screen, see
Figure 17-2. If the control senses a pressure below 7 PSI, burner operation is inhibited and “FILL” is displayed on
the screen, see Figure 17-8. As long as the water pressure is above 3 PSI the circulators will be permitted to
operate; otherwise they are only operated 5 seconds every minute.
Figure 17-8 Fill – Low Water Pressure
FILL – indicates the
water pressure is too
low.
Water Pressure
Table 17-3 Lockout and Error Code Descriptions
Code
Description
Ignition Error – five unsuccessful ignition attempts in a row; perform the following checks:
1. Check venting for blockages.
2. Check condensate trap from proper draining.
3. Static gas pressure – if insufficient check gas supply-lines and regulator.
4. Gas pressure during ignition – if the static gas pressure is sufficient, check pressure during ignition
sequence, i.e. when gas valve opens.
a. If pressure drops below minimum (4” for NG / 8” for LP), check gas supply-line and regulator.
b. If pressure does not move, verify 120VDC at valve during ignition; if no power, check wiring
Loc 1
– replace control; if power is present – replace gas valve.
c. If pressure drops slightly – proceed to next step
5. Unit ignites but immediately goes out – check flame sensor (clean or replace) and flame sensor
cable, clean combustion chamber, replace control. If a combustion analyzer is available, adjust
throttle screw out 1 turn – check/adjust combustion once unit is operational.
6. Unit fails to ignite – check spark electrode and cable (replace). Verify the spark electrode is arcing.
WARNING!! – maintain clearance from ignition components while the power is on to avoid
risk of severe electrical shock.
7. Unit ignites and runs – check combustion at maximum and minimum modulation rates.
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Display Menu Guide │
Code
Loc 2 - 4
Loc 5
Loc 6 & 7
Loc 8-9
Loc 10
Loc 11
Loc 12
Loc 13-24
Loc 25
Loc 26
Loc 27
Loc 28
Loc 29-30
Loc 31
Loc 32 up
Err 45-51
Err 52
Err 53
Err 54
Err 55-57
Err 58-59
Err 60
Err 61
Err 62-63
Err 64
74
Vmax I&O Manual
Description
Gas Valve Circuit Fault (Safety) – control has sensed a fault in the gas valve electrical circuit, check for a
loose connection in the gas valve wiring harness. Also see “Loc 5”.
Limit Circuit Open (Safety) – control has sensed a fault in the safety limit circuit; check the following:
1. External Limit (Purple wire) – if an external limit device (i.e. LWCO) is connected to the purple
wire at the field wiring terminal, check to ensure it has not tripped, and that it is wired correctly.
Power Supply Electrical Interference – check for poor line, neutral and ground connections in the wiring
leading to the boiler. Check the internal ground connections within the boiler. Eliminate sources of
electrical noise, i.e. welders, large pump inverters, etc. If power is being supplied by a generator, install an
appropriately sized UPS (Uninterruptible Power Supply).
Controller Malfunction – contact NTI, check field wiring, replace controller.
Supply Sensor Fault – controller has sensed an invalid reading at the Supply/Outlet sensor; check cable,
then replace sensor [see Figure 19-1(a), item 15].
Uncorrected Blocking Error – a blocking error (Err) has lasted for 20 consecutive hours.
Incorrect Fan Speed – measured fan speed is not reaching target fan speed within 60 seconds. Check
wiring to fan, replace fan.
Controller Malfunction – contact NTI, check field wiring, replace controller.
Excessive Supply Temperature Reading – controller has sensed an excessive temperature reading at the
Supply/Outlet sensor; verify proper water circulation, check supply sensor cable, then replace sensor [see
Figure 19-1(a), item 15]. Or,
Limit Circuit Open (Safety) – see “Loc 5”
Flue Sensor Fault – controller has sensed an invalid reading at the Flue sensor; check cable, then replace
sensor [see Figure 19-1(a), item 20].
Flame present 10 seconds after closing gas valve – verify flame is going out immediately following the
end of a burner demand; check flame sensor (replace); check condensate drain for blockages; increase post
purge setting (Installer Menu setting 2-30).
Flame present before ignition – check flame sensor (replace); check condensate drain for blockages;
increase post purge setting (Installer Menu setting 2-30).
Controller Malfunction – contact NTI, check field wiring, replace controller.
Flame lost three times during one demand – see Loc 1.
Controller Malfunction – contact NTI, check field wiring, replace controller.
Controller Malfunction – contact NTI, check field wiring, replace controller.
Incorrect Field Wiring – check electrical connections to field terminal strip; ensure the Thermostat is
connected to terminals 7 and 8.
Controller Malfunction – contact NTI, check field wiring, replace controller.
Flame detected out of sequence – check/replace flame sensor; check flame sensor wiring; check
condensate drain for blockages; replace controller.
Controller Malfunction – contact NTI, check field wiring, replace controller.
Water Pressure Error – increase system water pressure to a minimum of 12 PSI. If water pressure
reading at the external pressure gauge exceeds 15 PSI, inspect water pressure sensor and cable; if water
pressure sensor is dirty, gently clean with a calcium/rust remover. If necessary, replace water pressure
sensor [see Figure 19-1(a), item 24].
Flue Sensor Error – flue temperature reading exceeds 220⁰F or the sensor is shorted, check flue sensor
connection and wiring. Temporarily disconnect the electrical connector from the flue sensor, if problem
goes away, replace flue sensor [see Figure 19-1(a), item 20]; if problem persists, replace the controller [see
Figure 19-1(d), item 61].
Return Sensor Error – inlet temperature exceeded 203⁰F; error clears when inlet temperature drops below
190⁰F: (1) ensure there is water flow through the boiler, (2) check for correct return sensor reading (menu
reading 1-09), (3) check wiring to return sensor; replace sensor [see Figure 19-1(a), item 24].
Controller Malfunction – contact NTI, check field wiring, replace controller.
Faulty Grounding – check appliance grounding to breaker panel, check internal ground connections.
Vmax I&O Manual
│Display Menu Guide
Code
Description
Incorrect Polarity – controller has sensed reversed polarity of the 120VAC power supply; check field
Err 65
wiring to L2 NEUTRAL (terminals 14 &15) and L1 120VAC (terminal 16). There should be 120VAC
potential between L1 120VAC and ground, and 0VAC potential between L2 NEUTRAL and ground.
Incorrect Frequency – the controller accepts a line voltage frequency of 60Hz ± 2%; if outside this range
Err 66
the controller may be damaged or function incorrectly. If using a generator as a power source, install a UPS
(uninterruptible power supply) between the generator and boiler.
Err 67
Faulty Earth Ground – check grounding of boiler and power supply; replace controller.
Err 68-71 Controller Malfunction – contact NTI, check field wiring, replace controller.
Err 72
Supply Sensor Open – check wiring to supply sensor; replace sensor [see Figure 19-1(a), item 15].
Err 73
Supply Sensor Fault – check wiring to supply sensor; replace sensor [see Figure 19-1(a), item 15].
Err 74-77 Controller Malfunction – contact NTI, check field wiring, replace controller.
Err 78
Flue Sensor Open – check wiring to flue sensor; replace sensor [see Figure 19-1(a), item 20].
Err 79
Controller Malfunction – contact NTI, check field wiring, replace controller.
Err 80
Supply Sensor Shorted – check wiring to supply sensor; replace sensor [see Figure 19-1(a), item 15].
Err 81
Supply Sensor Shorted – check wiring to supply sensor; replace sensor [see Figure 19-1(a), item 15].
Err 82-85 Controller Malfunction – contact NTI, check field wiring, replace controller.
Err 86
Flue Sensor Shorted – see Err 60.
Reset Button Error – controller has sensed that the “Reset” button (see Figure 17.2) is stuck, inspect
Err 87
button, try pressing and releasing it to “unstick” it, if necessary remove plastic overlay from display. Turn
power off and on, if problem persists, replace display.
Err 88-92 Controller Malfunction – contact NTI, check field wiring, replace controller.
Appliance Type – the appliance type stored in the display does not match the appliance type stored in the
Err 93
controller. Set the appropriate appliance type using the procedure described under “Controller Replacement
Instructions”; see page 73.
Err 94 & up Controller Malfunction – contact NTI, check field wiring, replace controller.
Outdoor Sensor Shorted – controller has sensed a short circuit at the Outdoor sensor; check wiring to
Att 2
terminals 3 and 5 and outdoor sensor.
DHW Sensor Open – controller has sensed an open circuit at the DHW tank sensor; check wiring to
Att 3
terminals 3 and 6 and tank sensor. If no tank sensor is being used, set DHW Mode (setting 2-08) to the
appropriate setting; see Table 17-2.
DHW Sensor Shorted – controller has sensed a short circuit at the DHW tank sensor; check wiring to
Att 4
terminals 3 and 6 and tank sensor. If no tank sensor is being used, set DHW Mode (setting 2-08) to the
appropriate setting; see Table 17-2.
Warm Weather Shutdown (WWSD) Active – when the outdoor temperature (menu reading 1-08)
exceeds the WWSD setting (menu setting 2-04), “Att 6” is displayed during central heat demands, and the
boiler only responds to DHW demands. To avoid this error, increase menu setting 2-04. If the indicated
Att 6
temperature reading does not match the actual outdoor temperature, inspect the outdoor sensor wiring. If
wiring is fine, disconnect the outdoor sensor, menu reading 1-08 should indicate “OPEn,” if not, replace the
controller, if “OPEn” is indicated replace the outdoor sensor.
Service Reminder – occurs every 365 days; service the boiler and clear the warning by adjusting menu
Att 7
setting 2-16 to “OFF”.
Low Water Pressure – increase system water pressure to a minimum of 12 PSI. If water pressure reading
at the external pressure gauge exceeds 15 PSI, inspect water pressure sensor and cable; if water pressure
FILL
sensor is dirty, gently clean with a calcium/rust remover. If necessary, replace water pressure sensor [see
Figure 19-1(a), item 24].
Notes:
1
While displaying a lockout or blocking error, the User and Installer Menus can be accessed to view the status of boiler
sensors and settings.
2
Blocking errors (Err) and some lockouts (Loc) will not clear until the fault is correct.
3
Some lockouts (Loc) can only be cleared by holding the RESET button on the display console.
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Display Menu Guide │
Vmax I&O Manual
Controller Replacement Instructions
This section provides important information necessary to successfully replace the boiler controller, NTI p/n
84712, in the event the original controller fails. The replacement controller must be field configured to operate on
the Vmax boiler model it is being installed on. This is achieved by adjusting the controller’s Appliance Type
setting.
Appliance Type – the Appliance Type setting is retained in the boiler controller; the setting determines certain
operating characteristics specific to a particular boiler model, such as combustion blower RPM (i.e. firing
rate); see Table 17-4 for a list of Appliance Types and corresponding boiler models.
Table 17-4 Appliance Type Setting by Boiler Model
Model
VM110
VM110P
VM153 (NG)
Appliance Number
8
9
10
VM153P (NG)
VM153 (LP)
VM153P (LP)
11
13
14
Replacement Procedure – the replacement controller is factory set with an Appliance Type setting of zero (0);
upon replacement of the control the display will prompt you to set the appliance type, i.e. “tYPE 0” will
automatically be displayed on the screen (see Notice below). Adjust to the applicable Appliance Type setting
(see Table 17-4) using the UP & DOWN buttons; press the OK button to enter the value. Check the appliance
setting via Installer Menu setting 2-11; make sure it matches the correct boiler model as per Table 17-4. Set
the remainder of the control settings as desired. Verify proper boiler operation for DHW and Central Heat
demands.
If “tYPE 0” does not automatically display upon replacing the controller, the Appliance
Type setting must be adjusted using the “Appliance Selection Method” detailed below.
Appliance Selection Method – to change the Appliance Type setting, perform the following steps:
1. Turn the power off; while holding the UP and DOWN buttons, turn the power on using power switch on
the display console; see Figure 17-9. Continue holding the UP and DOWN buttons until “tYPE 0” is
displayed on the screen, then release the UP and DOWN buttons.
2. Increase the setting by press the UP button. When the correct setting is displayed, see Table 17-4; press the
OK button to enter the value.
3. Wait for a minimum of 1 minute, then cycle the power off and on.
4. Check the appliance setting via Installer Menu setting 2-11; make sure it matches the correct boiler model
as per Table 17-4. Set the remainder of the control settings as desired. Verify proper boiler operation on
Domestic Hot Water and Central Heat demands.
Figure 17-9 Appliance Selection
tYPE – indicates that the
Appliance Type setting is
ready to be adjusted.
Step 2b – once correct
Appliance Type setting is
displayed, press OK to
enter the value.
Step 1a – turn power off
76
Step 2a – set
Appliance Type per
Table 17-4.
Step 1b – while holding the
UP and DOWN buttons, turn
the power on; continue to
hold until tYPE is displayed.
│Parts List
Vmax I&O Manual
18.0 TROUBLESHOOTING
Observe the following precautions when servicing the boiler. Failure to comply with
these may result in fire, property damage, serious injury or death.
Servicing the Boiler
 Disconnect or shutoff all energy sources to the boiler: 120VAC power, water and gas.
 Identify and mark wires before disconnecting or removing them.
 Never bypass electrical fuses or limit devices except temporarily for testing.
 Use proper personal protective equipment (PPE) i.e. eye protection, safety footwear.
These procedures should only be performed by qualified service personnel, when abnormal operation of the
boiler is suspected. The boiler incorporates a sophisticated microprocessor based control which normally
responds appropriately to varying conditions. If the boiler operation appears to be incorrect, or it is not
responding at all to a demand for heat, the following is suggested to determine and correct the problem.
Before undertaking any troubleshooting procedures it is highly recommended to have
available a digital multimeter (s) capable of measuring AC and DC volts, Amperes,
Resistance (Ohms) and Continuity.
Diagnosing an Inoperative Boiler
1) Blank Display – perform the following steps:
 Ensure the boiler service switch located on the front of the boiler is in the ON (1) position.
 Ensure the main service switch (if applicable) is in the ON position.
 Ensure the circuit breaker in the electrical panel supplying power to the boiler in on.
 Measure across boiler terminals 16 and 15 (L1 120VAC and L2 NEUTRAL) for 120VAC, see Figure 12-2.
If 120VAC is present, check fuse located on the boiler controller, see Figure 18-1. If 120VAC is not
present, check wiring between the boiler and electrical panel for poor connections.
 Check the electrical connection to the display – connector is located behind display.
2) Display Normal but no heat to radiators – perform the following steps:
 Ensure there is a heat call from the thermostat (radiator symbol on the display will flash during a thermostat
demand). If uncertain about thermostat operation, place a jumper between the boiler’s Thermostat
terminals. If the radiator symbol does not display, check outdoor sensor reading (User Menu reading 1-08),
and compare to the warm weather shutdown setting (Installer Menu setting 2-04); central heat call will not
activate if the outdoor temperature is above the warm weather shutdown setting.
 If the radiator symbol is flashing, but the boiler is not firing, compare the boiler outlet temperature
(temperature displayed on the main screen) with the Current target temp (User Menu reading 1-01). Boiler
will not fire until the outlet temperature drops below the Current target temp by the CH setpoint differential
(Installer Menu setting 2-02 – default setting = 9ºF).
o Ensure the central heating pump(s) is running – if not ensure it is wired to pump output CH PUMP or
BOILER PUMP.
o If Current target temp is insufficient, increase CH setpoints (Installer Menu settings 2-01 and 2-05).
 If the radiator symbol is on but not flashing, and the faucet symbol is flashing, then the boiler is actively
servicing a DHW demand; at which time no hot water will go to the radiators. If condition continues,
consider increasing the DHW setpoint (Installer Menu setting 2-07), or decreasing the DHW priority time
(Installer Menu setting 2-09).
3) Display Normal but no DHW – perform the following steps:
 VM110 and VM153 and Indirect Tank with Tank Sensor, or VM110P and VM153P:
o Verify DHW Mode is set to 1 (Installer Menu setting 2-08).
o Verify there is a Tank sensor wired to COMMON and DHW (boiler terminals 3 and 6), see Figure 12-2.
Tank sensor temperature, DHW temp, is viewed from User Menu reading 1-03.
o Compare DHW setpoint (User Menu reading 1-04) with the DHW temp (User Menu reading 1-03).
DHW Tank demand is generated when the DHW temp drops below the DHW setpoint; after which
burner demand starts when the boiler outlet temperature (displayed on Main Screen) drops below the
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Troubleshooting │
Vmax I&O Manual
Current target temp (User Menu reading 1-01) by 10ºF. Current target temp for a DHW Tank demand
is equal to DHW setpoint + 50ºF; if necessary increase DHW setpoint (Installer Menu setting 2-07) –
130 to 140ºF recommended.
o If the radiator symbol is flashing on the display, the DHW priority time may have expired. Cycle power
and consider increasing the DHW priority time (Installer Menu setting 2-09) and/or DHW setpoint
(Installer Menu setting 2-07).
o If the faucet symbol is flashing on the display, verify the DHW circulator is operating – DHW circulator
should be wired to DHW PUMP and L2 NEUTRAL (boiler terminals 11 and 14/15); see Figure 12-2.
o Verify plumbing is in accordance with instructions in Section 10.0.
 Indirect Tank with Tank Thermostat (Not Applicable for VM110P and VM153P):
o Verify DHW Mode is set to 2 (Installer Menu setting 2-08).
o Verify there is a Tank thermostat wired to COMMON and DHW (boiler terminals 3 and 6), see Figure
12-2.
o Verify there is a demand from the thermostat; when the demand is on, DHW temp (User Menu reading
1-03) will indicate “CLOS”; when demand is off, DHW temp will indicate “OPEn”. If uncertain about
thermostat operation, place a jumper between terminals 3 and 6; the faucet symbol will flash on display
when there is a DHW demand.
o Compare DHW setpoint (User Menu reading 1-04) with the boiler outlet temperature (displayed on
Main Screen); burner demand starts with the boiler outlet temperature drops below the DHW setpoint by
10ºF. If necessary increase DHW setpoint (Installer Menu setting 2-07) – 160 to 190ºF recommended.
o If the radiator symbol is flashing on the display, the DHW priority time may have expired. Cycle power
and consider increasing the DHW priority time (Installer Menu setting 2-09) and/or DHW setpoint
(Installer Menu setting 2-07).
o If the faucet symbol is flashing on the display, verify the DHW circulator is operating – DHW circulator
should be wired to DHW PUMP and L2 NEUTRAL (boiler terminals 11 and 14/15); see Figure 12-2.
o Verify plumbing is in accordance with Section 10.0.
4) Display Normal but DHW is not hot enough – perform the following steps:
 Increase DHW setpoint (Installer menu setting 2-07):
o Indirect Tank with Tank Sensor (DHW Mode = 1) – recommended setting = 130 to 140ºF.
o Indirect Tank with Tank Thermostat (DHW Mode = 2) – recommended setting = 160 to190ºF.
 Vmax VM110P – DHW flow rate is too great; NTI does not recommend exceeding 3.8 USGPM. If
necessary, restrict overall DHW flow rate.
 Vmax VM153P – DHW flow rate is too great; NTI does not recommend exceeding 5.3 USGPM. If
necessary, restrict overall DHW flow rate.
 Indirect Tank – verify plumbing is in accordance with Section 10.0.
5) Display indicates an error (Err), lockout (Loc) or warning (Att); reference Table 17-3 in Section 17.0.
78
│Parts List
Vmax I&O Manual
Only replace Vmax controller fuse with identical part (LFT 3.15A, 250V “slow-blow”).
Failure to follow this warning may result in component failure or property damage.
Figure 18-1 Vmax Fuse Location (Display Assembly Removed for Illustration Purposes)
Figure 14-1 Tft Model
Operating Fuse, LFT
3.15A – “Slow-blow”
Spare Fuse
Boiler Controller
Table 18-1 Thermistor Resistance vs. Temperature
Temp °F (°C)
Resistance Ohms (Ω)
Temp °F (°C)
-22 (-30)
176,133
122 (50)
-4 (-20)
96,761
131 (55)
14 (-10)
55,218
140 (60)
32 (0)
32,650
149 (65)
41 (5)
25,390
158 (70)
50 (10)
19,900
167 (75)
59 (15)
15,710
176 (80)
68 (20)
12,490
185 (85)
77 (25)
10,000
194 (90)
86 (30)
8,057
203 (95)
95 (35)
6,531
212 (100)
104 (40)
5,327
230 (110)
113 (45)
4,369
* Not applicable for Return Sensor, p/n 84745
Resistance Ohms (Ω)
3,603
2,986
2,488
2,083
1,752
1,481
1,258
1,072
918
789
680
506
-
79
Parts List │
Vmax I&O Manual
19.0 PARTS LIST
For a list of parts that corresponds to the item numbers in the callouts, refer to Table 19-1. Note that some item
numbers may appear more than once in the parts list depending on which model number is being referenced.
Building Owners - Replacement parts are available from your stocking wholesaler. Contact your local Installer
or Wholesaler for assistance with parts.
Wholesalers - Contact NY Thermal Inc. directly when ordering replacement parts, 1-506-657-6000.
Installers - Contact NY Thermal Inc. directly if technical assistance required, 1-800-688-2575.
24
118
117
22
91
88
51
16
16
87
16
51
59
51
115
18
93
115
92
16
53
17
17
40
15
29
21
60
97
47
93
26
92
43
Figure 19-1(a) VM110P Heat Exchanger, Water Piping & Sensors
│Parts List
Vmax I&O Manual
24
21
18
66
64
64
17
47
58
15
17
43
40
60
26
Figure 19-1(b) VM110 Heat Exchanger, Water Piping & Sensors
4
79
33
1
2
32
36
25
34
10
5
8
14
9
Figure 19-1(c) VM110 & VM110P Gas Train
81
Parts List │
Vmax I&O Manual
51
47
64
18
51
91
88
22
64
27
59
92
87
12
64
64
17
51
40
92
43
29
92
51
92
103
17
26
15
53
60
92
51
24
21
58
Figure 19-1(d) VM153P Heat Exchanger, Water Piping & Sensors
│Parts List
Vmax I&O Manual
103
29
92
92
90
27
99
51
59
12
18
64
64
17
51
92
40
43
51
29
17
51
26
92
53
64
47
15
60
92
51
24
21
58
Figure 19-1(e) VM153 Heat Exchanger, Water Piping & Sensors
83
Parts List │
Vmax I&O Manual
Figure 19-1(f) VM153 & VM153P Gas Train
14
25
36
9
10
7
5
8
4
34
2
1
33
│Parts List
Vmax I&O Manual
107
52
35
70
80
95
84
74
77
78
86
45
45
82
75
41
20
28
37
42
61
54
76
39
55
49
73
85
57
56
72
Figure 19-1(g) Vmax Cabinet & Controls (VM110P illustrated)
85
Parts List │
Vmax I&O Manual
Figure 19-1(h) Vmax Installation Kit Box
VM110
115
81
69
VM110P & VM153P
VM110P
Each Vmax comes with an LP (Propane)
Conversion Kit, containing the
required LP orifice, decal and
conversion instructions.
120
114
116
112
81
113
110
111
VM110P
VM153P
&
VM153
38
71
8
83
108
31
30
19
119
109
Natural Gas to LP Conversion Kit
50
Common
VM110, VM110P,
VM153 & VM153P
Table 19-1 Parts List: Vmax Series
Item
Part # Model
1
84541 VM110, VM110P
1
85453 VM153, VM153P
2
84542 VM110, VM110P
2
84548 VM153, VM153P
4
84441 VM110(P), VM153(P)
5
85206 VM110, VM110P
5
85460 VM153, VM153P
7
85461 VM153, VM153P
8
84795 VM110, VM110P
8
85536 VM153, VM153P
8
85537 VM153, VM153P
9
84713 VM110, VM110P
9
85462 VM153, VM153P
10
83870 VM110(P), VM153(P)
12
85271 VM153, VM153P
14
85108 VM110(P), VM153(P)
15
84419 VM110(P), VM153(P)
16
84733 VM110P
17
84463 VM110(P), VM153(P)
18
85096 VM110P
18
85118 VM110
18
85213 VM153, VM153P
19
84474 VM110(P), VM153(P)
20
83608 VM110(P), VM153(P)
21
85095 VM110P
21
85117 VM110
Description
Premix Burner
Premix Burner
Premix Burner Gasket
Premix Burner Gasket
Blower Gasket
Blower/Venturi Assembly
Blower
Venturi Housing (w/o Venturi Insert)
LP Orifice, 5.05
LP - Venturi Insert
NG - Venturi Insert
Gas Valve
Gas Valve
Ignition Electrode, Dual (c/w gasket)
CH Return Pipe
Gas Valve Adapter ½” NPT (c/w screws & O-ring)
Outlet Sensor (Dual)
O-ring, 2.76 x 17.72mm
Pipe Coupling, groove joint, 1”
Supply Pipe, VM110P
Supply Pipe, VM110
Outlet Pipe to 3-Way Valve
Auto Air Vent, ½” NPT
Flue Sensor, Dual
Return Pipe, VM110P
Return Pipe, VM110
│Parts List
Vmax I&O Manual
Item
21
22
22
23
24
25
26
26
27
28
29
29
30
31
32
33
33
34
34
35
36
37
37
38
39
39
40
41
42
43
45
45
47
47
47
49
50
51
51
52
53
53
54
55
55
55
55
56
57
58
Part #
85216
85122
85214
84423
84745
84546
84453
85228
85270
85208
84915
85343
85119
84479
84545
84544
85455
84543
85456
84214
82762
84755
82099
82615
85152
85387
83718
85132
85133
85107
84567
TBD
84917
85114
85342
85163
TBD
84732
85381
84764-1
85100
85273
84476
TBD
TBD
TBD
TBD
83707
83724
84803
Model
VM153, VM153P
VM110P
VM153P
VM110(P), VM153(P)
VM110(P), VM153(P)
VM110(P), VM153(P)
VM110, VM110P
VM153, VM153P
VM153, VM153P
VM110(P), VM153(P)
VM110P
VM153, VM153P
VM110(P), VM153(P)
VM110, VM110P
VM110, VM110P
VM110, VM110P
VM153, 153P
VM110, VM110P
VM153, VM153P
VM110(P), VM153(P)
VM110(P), VM153(P)
VM110, VM110P
VM153, VM153P
VM110(P), VM153(P)
VM110, VM110P
VM153, VM153P
VM110(P), VM153(P)
VM110(P), VM153(P)
VM110(P), VM153(P)
VM110(P), VM153(P)
VM110P, VM153P
VM110, VM153
VM110P
VM110
VM153, VM153P
VM110(P), VM153(P)
VM110(P), VM153(P)
VM110P
VM153, VM153P
VM110(P), VM153(P)
VM110P
VM153, VM153P
VM110(P), VM153(P)
VM110P
VM110
VM153P
VM153
VM110, VM110P
VM110(P), VM153(P)
VM110(P), VM153(P)
Description
Heat Exchanger Inlet Pipe
Indirect Fired Water Heater (60L)
Indirect Fired Water Heater, High Performance (60L)
Receptacle, 120VAC
Inlet/Pressure Sensor
Sight Glass Assembly
Heat Exchanger ASME
Heat Exchanger ASME
CH Supply Pipe
Flue Sensor Grommet
Diverter Valve Stepper Motor
Pump & Diverter Valve Stepper Motor
Condensate Trap
Elbow, Brass, Street 90, ¾”
Burner Plate Gasket
Burner Plate Ceramic Disc
Burner Plate Insulation & Gasket
Burner Plate
Burner Plate
Grommet, Diaphragm, ½”
Flame Sensor
MJ Coupling, 1-1/2” x 1-1/4”
MJ Coupling, 1-1/2”
Round Mesh Vent Screen, 2”
Air-inlet Assembly VM110 & VM110P
Air-inlet Assembly VM153, VM153P
Hose Clamp, 1-1/16 to 1-1/2”
Flue Outlet Adapter PP 3”
Air-inlet Adapter PP 3”
Condensate Drain Adapter Tube
Wall Mounting Bracket Top, VM110P
Wall Mounting Bracket Top, VM110
Circulator Cartridge, VM110P, UPS15-78
Circulator, VM110, UPS15-58RU
CHBL, VM153, VM153P Pump
Blocked Condensate Drain / Blocked Vent Switch
Bottom Wall Mounting Bracket Set
Retaining Clip, 18mm, VM110P
Clip, D22, Pump and Valve
Display Assembly, 210LB
Heat Exchanger Inlet Connector, VM110P
Heat Exchanger Connector
Terminal, Barrier Double Row, 8 Position
Control Panel Support, VM110P
Control Panel Support, VM110
Control Panel Support, VM153P
Control Panel Support, VM153
Ignition Coil 4180002F
Spark Igniter Cable 12”
Pressure Sensor Retaining Clip
87
Parts List │
Item
59
59
60
61
62
63
64
66
67
69
70
71
72
72
72
73
73
74
74
75
76
76
76
76
77
78
79
80
80
80
80
81
81
82
82
82
83
84
85
86
87
87
88
88
90
91
92
92
93
95
97
Part #
85097
85227
85120
84712
TBD
TBD
85167
85113
84918
82869
TBD
81027-1
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
TBD
84569
84568
84919
TBD
TBD
TBD
TBD
85116
84466
TBD
TBD
TBD
83135
85131
TBD
TBD
85098
85214
85099
85215
85304
85139
84749
85382
84921
84095
84923
Vmax I&O Manual
Model
VM110P
VM153, VM153P
VM110, VM110P
VM110(P), VM153(P)
VM110(P), VM153(P)
VM110(P), VM153(P)
VM110
VM110
VM110(P), VM153(P)
VM110
VM110(P), VM153(P)
VM110(P), VM153(P)
VM110P, VM153P
VM110
VM153
VM110P, VM153, VM153P
VM110
VM110P, VM153, VM153P
VM110
VM110P, VM153P
VM110P
VM110
VM153P
VM1153
VM110(P), VM153(P)
VM110(P), VM153(P)
VM110(P), VM153(P)
VM110P
VM110
VM153
VM153P
VM110P, VM153, VM153P
VM110
VM110P
VM153P
VM153
VM110(P), VM153(P)
VM110(P), VM153(P)
VM110(P), VM153(P)
VM110P
VM110P
VM153P
VM110P
VM153P
VM153, VM153P
VM110P, VM153P
VM110P
VM153, VM153P
VM110P
VM110(P), VM153(P)
VM110P
Description
Outlet Pipe, VM110P, 25mm
Heat Exchanger Outlet Pipe
Plug, 1/8” BSP
Controller, 210MN
Control Panel Cover
Control Panel
Circulator Inlet/Outlet Gasket, VM110
Circulator Check Valve, VM110
Fuse, LFT 3.15, 250V
Bushing, Brass, 1 x ¾” NPT, VM110
Control Panel Sheet Metal
Outdoor Sensor
Front Cover, VM110P
Front Cover, VM110
Front Cover, VM153
Right Side, VM110P
Right Side, VM110
Left Side, VM110P
Left Side, VM110
Top Panel Access Cover, VM110P
Top, VM110P
Top, VM110
Top, VM153P
Top, VM153
Bottom Heat Exchanger Support
Top Heat Exchanger Support
Gas Valve to Venturi Gasket
Back, VM110P
Back / Bottom, VM110
Back, VM153
Back, VM153P
Tee, Brass, ¾ x ½ x ¾”, VM110P
Tee, Brass, 1 x ½ x 1”, VM110
Bottom, VM110P
Bottom, VM153P
Bottom, VM153
Hose Clamp, 9/16 to 1-1/16”
Flue Outlet Pipe, 80mm PP
Spark Generator Support Bracket
Tank Hold-out Bracket, VM110P
VM110P Tank Coil HWR Pipe
Tank HWR Pipe
VM110P Tank Coil HWS Pipe
Tank HWS Pipe
DHW Supply Pipe
Tank Sensor, VM110P
O-Ring, Inlet/Outlet, 4 x 17 mm, VM110P
O-Ring, Pump and Valve
Retaining Clips, Inlet/Outlet, VM110P
Plug, 7/8” Black Dome
CH Fittings, IWC, ¾” NPT, VM110P
Vmax I&O Manual
Item
99
103
107
108
109
110
111
112
112
113
113
114
115
116
117
118
119
119
120
Part #
85303
85269
84422
83991
13701
85295
82616
84925
85451
84867
85446
84156
82368
85110
85294
85111
84867-4
85446-1
83790
Model
VM153, VM153P
VM153, VM153P
VM110(P), VM153(P)
VM110(P), VM153(P)
VM110(P), VM153(P)
VM110(P), VM153(P)
VM110(P), VM153(P)
VM110, VM110P
VM153, VM153P
VM110, VM110P
VM153, VM153P
VM110P
VM110P
VM110P
VM110P
VM110P
VM110, VM110P
VM153, VM153P
VM110P, VM153P
│Parts List
Description
DHW Return
RV20 To CHBL Pipe
Rocker Power Switch, On/Off
CPVC Pipe 3”, System 636, 5” Long
Pressure Relief Valve, ASME, ¾” NPT, 30 PSI (Boiler)
Pressure & Temperature Gauge
Round Mesh Vent Screen, 3”
Natural Gas to LP Conversion Instructions
Natural Gas to LP Conversion Instructions
LP Conversion Decal
LP Conversion Decal
Temp. & Pressure Relief Valve, 150 PSI, ¾”, 100XL-8, VM110P
Compression Gasket, Rubber, VM110P
Low Loss Header Pipe, VM110P
Auto Air Vent – IWC
IWC – Integrated Water Control, Vmax Plus, VM110P
NG to LP Conversion Kit
NG to LP Conversion Kit
Cap, Brass ¾” FPT
89
Parts List │
Vmax I&O Manual
NOTES
│Parts List
Vmax I&O Manual
NOTES
91
Parts List │
Vmax I&O Manual
Visit us
online
NY Thermal Inc. 30 Stonegate Drive, Saint John, NB E2H 0A4 Canada
Technical Assistance: 1-800-688-2575
Fax: 1-506-432-1135
www.ntiboilers.com
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