Heatilator NB3630M User manual

Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07 1
Owner’s Manual
Installation and Operation
Models:
NB3630M, NB3630MI,
NB3933M, NB3933MI,
NB4236M, NB4236MI,
NB4842M, NB4842MI
B-Vent Gas Appliance
Installation and service of this appliance should be performed
by qualified personnel. Hearth & Home Technologies
suggests NFI certified or factory-trained professionals, or
technicians supervised by an NFI certified professional.
This appliance may be installed as an OEM installation
in manufactured home (USA only) or mobile home and
must be installed in accordance with the manufacturer’s
instructions and the manufactured home construction and
safety standard, Title 24 CFR, Part 3280 or Standard for
Installation in Mobile Homes, CAN/CSA Z240MH.
This appliance is only for use with the type(s) of gas
indicated on the rating plate.
In the Commonwealth of Massachusetts:
• installation must be performed by a licensed plumber or gas fitter.
• a CO detector shall be installed in the room where the appliance is
installed.
DO NOT DISCARD THIS MANUAL
CAUTION
• Important operating and
maintenance instructions
included.
• Leave this manual with
party responsible for
use and operation.
• Read, understand and follow
these instructions for safe
installation and operation.
DO NOT
DISCARD
If the information in these instruc-
tions is not followed exactly, a
fire may result causing property
damage, personal injury, or death.
• Do not store or use gasoline or other flam-
mable vapors and liquids in the vicinity of
this or any other appliance.
• What to do if you smell gas:
- Do not try to light any appliance.
- Do not touch any electrical 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.
• Installation and service must be performed
by a qualified installer, service agency, or
the gas supplier.
WARNING
HOT SURFACES!
Glass and other surfaces are hot during
operation and cool down.
WARNING
• CAREFULLY SUPERVISE children in same room as
appliance.
• Alert children and adults to hazards of high
temperatures.
High temperatures may ignite clothing or other
flammable materials.
• Keep clothing, furniture, draperies and other combustibles
away.
Hot glass will cause burns.
• Do not touch glass until it is cooled
• NEVER allow children to touch glass
• Keep children away
This appliance has been supplied with an integral
barrier to prevent direct contact with the fixed glass
panel. Do NOT operate the appliance with the barrier
removed.
Contact your dealer or Hearth & Home Technologies if the
barrier is not present or help is needed to properly install one.
¨

2 Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07
Read this manual before installing or operating this appliance.
Please retain this owner’s manual for future reference.
Congratulations on selecting a Heatilator gas appliance—an
elegant and clean alternative to wood burning appliances.
The Heatilator gas appliance you have selected is designed
to provide the utmost in safety, reliability, and efficiency.
As the owner of a new appliance, you’ll want to read and
carefully follow all of the instructions contained in this owner’s
manual. Pay special attention to all cautions and warnings.
This owner’s manual should be retained for future reference.
We suggest you keep it with your other important documents
and product manuals.
The information contained in this owner’s manual, unless
noted otherwise, applies to all models and gas control
systems.
Your new Heatilator gas appliance will give you years of
durable use and trouble-free enjoyment. Welcome to the
Heatilator family of appliance products!
Homeowner Reference Information
Model Name: Date purchased/installed:
Serial Number: Location on appliance:
Dealership purchased from: Dealer phone:
Notes:
We recommend that you record the following pertinent
information about your appliance:
Listing Label Information/Location
The model information regarding your specific appliance can be found on the rating plate located in the control area of the
appliance.
XXXX
CERTIFIED
FOR CANADA
CERTIFIÉ POUR LE
CANADA
Hearth & Home Technologies Inc
1915 W. Saunders Street
Mt. Pleasant, IA 52641
SERIAL
NO. DE SÉRIE
ANSI Standard
MODEL MFG. DATE
MODÈLE DATE DE FAB.
GAS TYPE/TYPE DE GAZ NATURAL/NATUREL PROPANE
ALTITUDE 0-2000 2000-4000 FT/PI 0-2000 2000-4000 FT/PI
MAX INPUT/DÉBIT XX,XXX XX,XXX BTUH XX,XXX XX,XXX BTUH
MIN INPUT/DÉBIT XX,XXX XX,XXX BTUH XX,XXX XX,XXX BTUH
MANIFOLD PRESSURE/PRESSION TUBULAIRE
MAX. XX IN. W.C./C. D'EAU XX IN. W.C./C. D'EAU
MIN. XX IN. W.C./C. D'EAU XX IN. W.C./C. D'EAU
MIN. INLET PRESS. XX IN. W.C./C. D'EAU 1XX IN. W.C./C. D'EAU
FOR THE PURPOSE OF INPUT ADJUSTMENT
PRESS. MIN. D'ALIMENTATION
ORIFICE SIZE
DIAM. DE L'INJECTEUR XX/XX DIA. in./mm XX/XX DIA. in./mm
LESS THAN/MOINS DE 3 AMPÈRES., 115V., 60 Hz
DO NOT REMOVE OR COVER THIS LABEL.
VENTED GAS FIREPLACE - NOT FOR USE WITH SOLID FUEL.
FOYER À GAZ À ÉVACUATION - NE DOIT PAS ÊTRE UTILISÉ
AVEC UN COMBUSTIBLE SOLIDE.
XXXXXXXXX
XXXXXX
Serial #
Gas Type
Orifice
Size
Model #
Congratulations

Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07 3
Table of Contents
1 Listing and Code Approvals 4
A. Appliance Certification. . . . . . . . . . . . . . . . . . . . . . . . . 4
B. Glass Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 4
C. BTU Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
D. High Altitude Installations . . . . . . . . . . . . . . . . . . . . . . 4
E. Non-Combustible Materials . . . . . . . . . . . . . . . . . . . . . 4
F. Combustible Materials. . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Getting Started 5
A. Design and Installation Considerations . . . . . . . . . . . . 5
B. Negative Pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
C. Tools and Supplies Needed. . . . . . . . . . . . . . . . . . . . . 7
D. Inspect the Appliance and Components . . . . . . . . . . . 7
3 Framing and Clearances 8
A. Select Appliance Location . . . . . . . . . . . . . . . . . . . . . . 8
B. Construct the Appliance Chase . . . . . . . . . . . . . . . . . . 9
C. Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
D. Mantel Projections . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4 Termination Locations 12
A. Vent Termination Minimum Clearances . . . . . . . . . . . 12
5 Vent Information and Diagrams 13
A. Vent Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
B. Vent System Configuration . . . . . . . . . . . . . . . . . . . . 13
6 Vent Clearances and Framing 15
A. Pipe Clearances to Combustibles . . . . . . . . . . . . . . . 15
B. Wall Penetration Framing . . . . . . . . . . . . . . . . . . . . . 15
C. Vertical Penetration Framing . . . . . . . . . . . . . . . . . . . 15
7 Appliance Preparation 16
A. Installing Outside Air Kit Damper Assembly . . . . . . . 16
B. Gas and Electrical Connections . . . . . . . . . . . . . . . . 17
C. Securing and Leveling Appliance . . . . . . . . . . . . . . . 17
8 Installing Vent Pipe 18
A. Assemble Vent Sections . . . . . . . . . . . . . . . . . . . . . . 18
B. Attach Vent to Firebox Assembly . . . . . . . . . . . . . . . 18
C. Securing Vent Sections . . . . . . . . . . . . . . . . . . . . . . . 18
9 Gas Information 19
A. Fuel Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
B. Gas Pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
C. Gas Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
D. High Altitude Installations . . . . . . . . . . . . . . . . . . . . . 20
10 Electrical Information 21
A. Recommendation for Wire. . . . . . . . . . . . . . . . . . . . . 21
B. Connecting to the Appliance . . . . . . . . . . . . . . . . . . . 21
C. Intellifire Ignition System Wiring . . . . . . . . . . . . . . . . 21
D. Standing Pilot Ignition System Wiring . . . . . . . . . . . . 22
E. Junction Box Installation . . . . . . . . . . . . . . . . . . . . . . 23
F. Wall Switch Installation for Fan (Optional). . . . . . . . . 23
11 Finishing 24
A. Mantel Projections. . . . . . . . . . . . . . . . . . . . . . . . . . . 24
B. Facing Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
12 Appliance Setup 25
A. Remove the Shipping Materials. . . . . . . . . . . . . . . . . 25
E. Clean the Appliance. . . . . . . . . . . . . . . . . . . . . . . . . . 25
B. Remove the Clean Face Components . . . . . . . . . . . 25
C. Remove Glass Assembly. . . . . . . . . . . . . . . . . . . . . . 25
D. Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
F. Lava Rock, Vermiculite, Rockwool Placement . . . . . 25
G. Replace Glass Assembly. . . . . . . . . . . . . . . . . . . . . . 26
H. Install Clean Face Components . . . . . . . . . . . . . . . . 26
I. Air Shutter Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
13 Operating Instructions 29
A. Before Lighting Appliance . . . . . . . . . . . . . . . . . . . . . 29
B. Check Appliance Draft. . . . . . . . . . . . . . . . . . . . . . . . 30
C. Lighting the Appliance . . . . . . . . . . . . . . . . . . . . . . . . 31
D. After the Appliance is Lit . . . . . . . . . . . . . . . . . . . . . . 33
E. Frequently Asked Questions . . . . . . . . . . . . . . . . . . . 33
14 Troubleshooting 34
A. Standing Pilot Ignition System. . . . . . . . . . . . . . . . . . 34
B. Intellifire Ignition System . . . . . . . . . . . . . . . . . . . . . . 36
15 Maintaining and Servicing the Appliance 38
16 Reference Materials 40
A. Appliance Dimension Diagram . . . . . . . . . . . . . . . . . 40
B. Service Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
C. Optional Components . . . . . . . . . . . . . . . . . . . . . . . . 58
D. Limited Lifetime Warranty . . . . . . . . . . . . . . . . . . . . . 67
E. Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Note: An arrow (¨) found in the text signifies change in content.

4 Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07
1
1 Listing and Code Approvals
A. Appliance Certification
This product is listed to ANSI standards for “Vented Gas
Fireplaces” and “Gas Fired Appliances for Use at High Al-
titudes”.
This model (natural gas and propane) can be installed in a
bedroom (in the United States) which has a total volume of
unconfined space appropriate to the particular installation.
Refer to the National Fuel Gas Code ANSI Z223.1/NFPA54
(current edition), The Uniform Mechanical Code - (cur-
rent edition), and local building officials for the options al-
lowed in obtaining an effective bedroom volume of uncon-
fined space.
This model (natural gas and propane) can be installed in a
bedroom (in Canada) if a thermostat is installed with the ap-
pliance. Consult local code authorities.
Do NOT use this appliance if any part has been under
water. Immediately call a qualified service technician
to inspect the appliance and to replace any part of the
control system and any gas control which has been
under water.
WARNING
MODELS: NB3630M, NB3630MI, NB3933M,
NB3933MI, NB4236M, NB4236MI,
NB4842M, NB4842MI
LABORATORY: Underwriters Laboratories, Inc. (UL)
TYPE: B-Vent Gas Appliance
STANDARD: ANSI Z21.88-2005/CSA2.33-2005
NOT INTENDED FOR USE AS A PRIMARY HEAT
SOURCE. This appliance is tested and approved as either
supplemental room heat or as a decorative appliance. It
should not be factored as primary heat in residential heating
calculations.
Note: This installation must conform with local codes. In the
absence of local codes you must comply with the National
Fuel Gas Code, ANSI Z223.1-latest edition in the U.S.A.
and the CAN/CGA B149 Installation Codes in Canada.
B. Glass Specifications
Hearth & Home Technologies appliances manufactured with
tempered glass may be installed in hazardous locations such
as bathtub enclosures as defined by the Consumer Product
Safety Commission (CPSC). The tempered glass has been
tested and certified to the requirements of ANSI Z97.1 and
CPSC 16 CFR 1202 (Safety Glazing Certification Council
SGCC# 1595 and 1597. Architectural Testing, Inc. Reports
02-31919.01 and 02-31917.01).
This statement is in compliance with CPSC 16 CFR Section
1201.5 “Certification and labeling requirements” which refers
to 15 U.S. Code (USC) 2063 stating “…Such certificate shall
accompany the product or shall otherwise be furnished to
any distributor or retailer to whom the product is delivered.”
C. BTU Specifications
D. High Altitude Installations
U.L. Listed gas appliances are tested and approved without
requiring changes for elevations from 0 to 2000 feet in the
U.S.A. and Canada.
When installing this appliance at an elevation above 2000 ft,
it may be necessary to decrease the input rating by chang-
ing the existing burner orifice to a smaller size. Input rate
should be reduced by 4% for each 1000 ft above a 2000 ft
elevation in the U.S.A., or 10% for elevations between 2000
and 4500 ft in Canada. If the heating value of the gas has
been reduced, these rules do not apply. To identify the prop-
er orifice size, check with the local gas utility.
If installing this appliance at an elevation above 4500 ft (in
Canada), check with local authorities.
Some local building codes require the use of tempered glass
with permanent marking in such locations. Glass meeting
this requirement is available from the factory. Please contact
your dealer or distributor to order.
Novus BV NB3630M NB3933M
Standing Pilot or IPI
Max/Min Input Rate (NG) 20,000/14,000 22,000/15,000
Orifice Size (NG) 0.083 0.089
Max/Min Input Rate (LP) 20,000/15,000 22,000/15,000
Orifice Size (LP) 0.052 0.055
Novus BV NB4236M NB4842M
Standing Pilot or IPI
Max/Min Input Rate (NG) 25,000/17,000 30,000/20,500
Orifice Size (NG) 0.094 0.104
Max/Min Input Rate (LP) 25,000/17,000 30,000/20,500]
Orifice Size (LP) 0.058 0.064
E. Non-Combustible Materials
Material which will not ignite and burn. Such materials are
those consisting entirely of steel, iron, brick, tile, concrete,
slate, glass or plasters, or any combination thereof.
Materials that are reported as passing ASTM E 136, Stan-
dard Test Method for Behavior of Materials in a Vertical
Tube Furnace at 750° C, shall be considered non-combus-
tible materials.
F. Combustible Materials
Materials made of or surfaced with wood, compressed pa-
per, plant fibers, plastics, or other material that can ignite and
burn, whether flame proofed or not, or whether plastered or
unplastered shall be considered combustible materials.

Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07 5
A. Design and Installation Considerations
Heatilator B-vent gas appliances are designed to operate
with all exhaust gases expelled to the outside of the building,
and combustion air pulled from the room.
Check building codes prior to installation.
• Installation MUST comply with local, regional,
state and national codes and regulations.
• Consult insurance carrier, local building, fire
officials or authorities having jurisdiction about
restrictions, installation inspection, and permits.
CAUTION
When planning an appliance installation, it’s necessary to
determine the following information before installing:
• Where the appliance is to be installed. See Sections 3
and 4.
• The vent system configuration to be used. See Sections
5 and 6.
• Gas supply piping. See Sections 7 and 9.
• Electrical wiring. See Sections 7 and 10
• Framing and finishing details. See Sections 3, 6
and 11.
• Whether optional accessories—devices such as a fan, wall
switch, or remote control—are desired. See Section 16.
Keep appliance dry.
• Mold or rust may cause
odors.
• Water may damage controls.
WARNING
2
2 Getting Started

6 Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07
B. Negative Pressure
Asphyxiation Risk
• Negative pressure can cause spillage of
combustion fumes and soot.
• Fire needs to draft properly for safe
operation.
WARNING
To minimize the effects of negative air pressure, the follow-
ing must be considered:
• Install the outside air kit. Install the intake on the side of
the house towards prevailing winds during the heating
season.
• Ensure adequate outdoor air is supplied for combustion
appliances and exhaust equipment.
• Ensure furnace and air conditioning return vents are not
located in the immediate vicinity of the fireplace.
• Avoid installing the fireplace near doors, walkways or small
isolated spaces.
• Recessed lighting should be a “sealed can” design; attic
hatches weather stripped or sealed; attic mounted duct
work and air handler joints and seams taped or sealed.
• Basement installations should be avoided due to stack
effect. Stack effect creates negative pressure in lower
levels. Hearth & Home Technologies recommends the
use of direct vent fireplaces in basements.
Location of the fireplace and chimney will affect performance.
As shown in Figure 2.1 the chimney should:
• Be installed through the warm airspace enclosed by the
building envelope. This helps to produce more draft,
especially during lighting and die-down of the fire.
• Penetrate the highest part of the roof. This minimizes the
effects of wind turbulence.
• Be located away from trees, adjacent structures, uneven
roof lines and other obstructions.
Offsets can restrict draft so their use should be minimized.
Consider the fireplace location relative to floor and ceiling
and attic joists.
Recommended
Location
Marginal
Location
Location
Not
Recommended
Recommended
Location
Multi-level Roofs
Windward
Leeward
Outside Air Intake
Location
Not
Recommended
Figure 2.1 Recommended Chimney Locations
Draft is the pressure difference needed to vent fireplaces
successfully. Considerations for successful draft include:
• Preventing negative pressure.
• Location of fireplace and chimney.
Negative Pressure
Negative pressure results from the imbalance of air avail-
able for the fireplace to operate properly. Causes for this
imbalance include:
• Exhaust fans (kitchen, bath, etc.).
• Range hoods.
• Combustion air requirements for furnaces, water heaters
and other combustion appliances.
• Clothes dryers.
• Location of return-air vents to furnace or air
conditioning.
• Imbalances of the HVAC air handling system.
• Upper level air leaks (recessed lighting, attic hatch
opening, duct leaks).

Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07 7
Inspect appliance and components for
damage. Damaged parts may impair safe
operation.
• Do NOT install damaged components.
• Do NOT install incomplete components.
• Do NOT install substitute components.
Report damaged parts to dealer.
WARNING
Hearth & Home Technologies disclaims any
responsibility for, and the warranty will be
voided by, the following actions:
• Installation and use of any damaged appliance or
vent system component.
• Modification of the appliance or vent system.
• Installation other than as instructed by Hearth & Home
Technologies.
• Improper positioning of the gas logs or the glass
door.
• Installation and/or use of any component part not
approved by Hearth & Home Technologies.
Any such action may cause a fire hazard.
WARNING
C. Tools and Supplies Needed
Before beginning the installation be sure that the following
tools and building supplies are available.
Reciprocating saw Framing material
Pliers Hi temp caulking material
Hammer Gloves
Phillips screwdriver Framing square
Flat blade screwdriver Electric drill and bits (1/4 in.)
Plumb line Safety glasses
Level Manometer
Voltmeter Tape measure
Non-corrosive leak check solution
1/2 - 3/4 in. length, #6 or #8 Self-drilling screws
One 1/4 in. female connection (for optional fan).
D. Inspect the Appliance and Components
The following B-vent components are needed for installa-
tion. See Figure 2.2.
• Appliance
• Pipe components
• Firestops
• Attic Insulation Shield
• Elbows
• Strapping
• Roof flashing or chase top
• Termination cap
• Storm Collar
• Carefully remove the appliance and components from the
packaging.
• The vent system components and trim doors are shipped
in separate packages.
• The gas logs may be packaged separately and must be
field installed.
• Report to your dealer any parts damaged in shipment,
particularly the condition of the glass.
• Read all of the instructions before starting the
installation. Follow these instructions carefully
during the installation to ensure maximum safety and
benefit.
Vertical
Termination
Cap
Roof
Flashing
Ceiling
Firestop
B-Vent Pipe
Sections
Storm
Collar
Figure 2.2 Typical Vertical Installation

8 Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07
Note:
• Illustrations reflect typical installations and are FOR
DESIGN PURPOSES ONLY.
• Illustrations/diagrams are not drawn to scale.
• Actual installation may vary due to individual design
preference.
Fire Risk
Provide adequate clearance:
• Around air openings.
• For service access.
Locate appliance away from traffic areas.
WARNING
A. Select Appliance Location
When selecting a location for your appliance it is important to
consider the required clearances to walls (See Figure 3.1).
Note: For actual appliance dimensions refer to
Section 16.
In addition to these framing dimensions, also reference the
following sections:
• Clearances and Mantel Projections (Sections 3.C. and 3.D.)
• Vent Clearances and Framing (Section 6)
A
A
A
C
B
B
1/2 in. (13 mm) min.
appliance
to combustibles
Alcove
Installation
C
D
Drywall 48 in.
(1219 mm)
max.
Figure 3.1 Appliance Locations
3
3 Framing and Clearances
Model A B C D
NB3630M/MI inches 36 33-1/2 19-5/8 37
mm 914 851 498 940
NB3933M/MI inches 39 35-1/2 19-5/8 40
mm 991 902 498 1016
NB4236M/MI inches 42 37-5/8 19-5/8 43
mm 1067 956 498 1092
NB4842M/MI inches 48 41-7/8 19-5/8 49
mm 1219 1064 498 1245

Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07 9
B. Construct the Appliance Chase
A chase is a vertical boxlike structure built to enclose the gas
appliance and/or its vent system. Vertical vents that run on
the outside of a building may be, but are not required to be,
installed inside a chase.
Construction of the chase may vary with the type of build-
ing. These instructions are not substitutes for the require-
ments of local building codes. Local building codes MUST
be checked.
Chases should be constructed in the manner of all outside
walls of the home to prevent cold air drafting problems. The
chase should not break the outside building envelope in any
manner.
Walls, ceiling, base plate and cantilever floor of the chase
should be insulated. Vapor and air infiltration barriers should
be installed in the chase as per regional codes for the rest of
the home. Additionally, Hearth & Home Technologies recom-
mends that the inside surfaces be sheet rocked and taped
(or the use of an equivalent method) for maximum air tight-
ness.
To further prevent drafts gas line holes and other openings
should be caulked with high temp caulk or stuffed with un-
faced insulation. If the appliance is being installed on a ce-
ment slab, we recommend that a layer of plywood be placed
underneath to prevent conducting cold up into the room.
Fire Risk
• Construct chase to all clearance
specifications in manual.
• Locate and install appliance to all
clearance specifications in manual.
WARNING

10 Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07
C. Clearances
Per
Manufacturer’s
Specifications
C
B
A
32-1/2 in.
(826 mm)
to ceiling
0 in.
0 in. TO LEVEL
OF STANDOFFS
1/2 in.
(13 mm)
Drywall
0 in.
1/2 in.
(13 mm)
Combustible Object
36 in.
(914 mm)
Combustible flooring may be installed
next to the front of the appliance.
Figure 3.2 Clearances to Combustibles
Model
A
Rough Opening
(Width)
B
Rough Opening
(Height)
C
Rough Opening
(Depth)
NB3630M/MI in. 36 34-7/8 19-5/8
mm 914 886 498
NB3933M/MI in. 39 34-7/8 19-5/8
mm 991 886 498
NB4236M/MI in. 42 34-7/8 19-5/8
mm 1067 886 498
NB4842M/MI in. 48 34-7/8 19-5/8
mm 1219 886 498
Fire Risk
Odor Risk
• Install appliance on hard metal or wood
surfaces extending full width and depth
of appliance.
• Do NOT install appliance directly on
carpeting, vinyl, tile or any combustible
material other than wood.
• Do NOT place furniture or any other
combustible household objects within
36 in. of the appliance front.
WARNING
Note: If the inside of the framed cavity is to be
finished, the framing dimensions must include the
finished surface. If drywall is to be attached to the
rear wall, the depth must be measured from the
drywall surface.

Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07 11
Measured from top of hood (in inches)
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
55-1/26-1/4
7
7-3/4
8-1/2
9-1/4 10
10-3/4
11-1/2
12-1/4
13
13-3/4
14-1/2
15-1/4
16
32-1/2 in. minimum
to ceiling
Figure 3.3 Clearances to Mantels or Other Combustibles Above Appliance
1 in. (25 mm) min.
to perpendicular wall
A
3-1/2 in. (89 mm) min.
from fireplace opening
to perpendicular wall
B
48 in.
(1219 mm)
max.
Mantel Leg or
Perpendicular Wall
Top of
Appliance
Drywall
A
B
Figure 3.4 Clearances to Combustible Mantel Legs or Wall Projec-
tions (acceptable on both sides of opening)
D. Mantel Projections
Fire Risk
• Comply with all minimum clearances to combustibles as specified.
• Framing or finishing material used on the front of, or in front of, the appliance closer than the minimums
listed, must be constructed entirely of noncombustible materials (i.e., steel studs, concrete board, etc.).
Failure to comply may cause fire.
WARNING

12 Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07
A. Vent Termination Minimum Clearances
Fire Risk
Explosion Risk
• Do not pack air space with insulation or
other materials.
Maintain vent clearance to combustibles as
specified.
WARNING
Failure to keep insulation or other materials
away from vent pipe may cause fire.
A Gas Termination Wood or Fuel Oil Termination
B6 in.
(152 mm) min. 20 in. (508 mm) min.
B-Vent Gas, Wood or Fuel
Oil Termination
8 ft
(2.44 m)
(minimum) to
Perpendicular
Wall
(gas only)
18 in.
(457 mm)
A
Gas
Termination
B
B-Vent Gas, Wood or Fuel
Oil Termination
8 ft
(2.44 m)
(minimum) to
Perpendicular
Wall
(gas only)
Wood or
Gas Termination
20 in. min. *
(508 mm)
Termination Caps Same Height
Termination Caps Staggered Height
* If using decorative cap cover(s), this distance may
need to be increased. Refer to the installation instruc-
tions supplied with the decorative cap cover.
Figure 4.2 Multiple Vertical Termination
Figure 4.1 specifies minimum vent heights for various
pitched roofs.
4
4 Termination Locations
12
X
8 ft
(2.44 m)
Lowest
Discharge
Opening
Termination
Cap
Roof Pitch
is X / 12
Vertical
wall
H (min.) - Minimum height
from roof to lowest
discharge opening.
Roof Pitch H (Min.) Ft. Roof Pitch H (Min.) Ft.
Flat to 6/12 1.0* Over 11/12 to 12/12 4.0
Over 6/12 to 7/12 1.25* Over 12/12 to 14/12 5.0
Over 7/12 to 8/12 1.5* Over 14/12 to 16/12 6.0
Over 8/12 to 9/12 2.0* Over 16/12 to 18/12 7.0
Over 9/12 to 10/12 2.5 Over 18/12 to 20/12 7.5
Over 10/12 to 11/12 3.25 Over 20/12 to 21/12 8.0
* 3 ft. minimum in snow regions
Storm Collar
Roof
Flashing
Figure 4.1 Minimum Height from Roof to Lowest Discharge Opening

Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07 13
Fire Risk
Explosion Risk
Asphyxiation Risk
Do NOT connect this gas appliance to a
chimney flue serving a separate solid-fuel
or gas burning appliance.
• Vent this appliance directly outside.
• Use separate vent system for this
appliance.
May impair safe operation of this appliance or
other appliances connected to the flue.
WARNING
ALL vent configuration specifications MUST be
followed.
• This product is tested and listed to appliance and
vent manufacturer’s specifications.
• Appliance performance will suffer if specifications
are not followed.
CAUTION
Minimum
clearances are
per vent
manufacturer's
specifications
Metal
plumber's strap
secured to
framing
Vent supports are per
vent manufacturer's
specifications
12 ft (3.66 m) min.
60 ft (18.29 m) max.
Figure 5.1 Vertical Termination Clearances
Maximum horizontal run is 50% of
vertical. Horizontal run cannot be
more than 30 ft. (9.14 m).
Vent supports
are per vent
manufacturer’s
specifications.
Metal
Plumbers'
Strap
Figure 5.2 Maximum Horizontal Run
5
5 Vent Information and Diagrams
A. Vent Guidelines
Fire Risk
Asphyxiation Risk
This appliance requires the specified pipe
for operation.
• Incorrect pipe may cause spillage,
condensation and overheating.
WARNING
These models require the following size B-Vent double wall
vent pipe.
Model Pipe Size
NB3630M/NB3630MI/NB3933M/NB3933MI 5 in. (127 mm)
NB4236M/NB4236MI/NB4842M/NB4842MI 5 in. (127 mm)
• Follow pipe manufacturer’s installation guidelines when
installing the appliance.
B. Vent System Configuration
• Rise to Run Ratio: 2:1
• Maximum Total Horizontal Run: 30 ft (9.14 m)
• Minimum Total Vertical Rise: 12 ft (3.66 m)
• Maximum Total Vertical Rise: 60 ft (18.29 m)
• Maximum Number of Elbows: Four 90° or Eight 45°

14 Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07
45°
Elbow
90°
Elbow
Offsets exceeding
45° adapt horizontal
limitations
Maximum
horizontal
30 ft (9.14 m)
Note: Maximum horizontal
distance is 50% of vertical
vent height.
Fire Risk
Explosion Risk
Insulation and other combustibles must not
infringe on clearances.
• ALWAYS maintain specified clearances
around venting and firestop systems.
• Install firestops as specified.
Failure to keep insulation or other material
away from vent pipe may cause fire.
WARNING
Figure 5.3 Maximum Horizontal Run

Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07 15
A. Pipe Clearances to Combustibles
Fire Risk
Explosion Risk
Maintain vent clearance to combustibles as
specified.
• Do not pack air space with insulation or
other materials.
• National building codes recommend
using attic shield to keep loose materials/
insulation from contacting vent.
Failure to keep insulation or other materials
away from vent pipe may cause fire.
WARNING Do not pack with insulation
or other materials.
Use manufacturer's
installation instructions for
framing dimensions
Figure 6.1 Exterior Wall Hole
6
6 Vent Clearances and Framing
B. Wall Penetration Framing
Follow vent pipe manufacturer’s instructions for all clear-
ances around pipe.
For a wall penetration consult B-vent pipe manufacturer’s
instructions. Use same dimensional framing materials as
those used in the wall construction.
Note: MUST terminate vertically.
C. Vertical Penetration Framing
Use B-vent manufacturer’s firestops to provide adequate
clearances.
Fire Risk
Keep loose materials or blown insulation
from touching the vent pipe.
• National building codes recommend
using attic shield to keep loose materials/
insulation from contacting vent.
• Hearth & Home Technologies requires
the use of an attic shield.
WARNING

16 Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07
7
7 Appliance Preparation
Sharp Edges
• Wear protective gloves
and safety glasses during
installation.
CAUTION
Fire Risk
Asphyxiation Risk
Maintain vent clearance to combustibles as
specified.
• Do not pack air space with insulation or
other materials.
• National building codes recommend
using attic shield to keep loose materials/
insulation from contacting vent.
Failure to keep insulation or other materials
away from vent pipe may cause fire.
WARNING
A. Installing Outside Air Kit Damper Assembly
This appliance will operate correctly only if adequate ventia-
tion is provided to allow proper draft to the system.
An outside air kit is available as an optional feature with this
appliance. An outside air kit helps to decrease the amount
of room air taken by utilizing outside air for combustion. We
strongly recommend that it be installed.
Outlet placed
higher than 3 ft
below the
termination cap
Attic space
Garage or
combustible
liquids storage
Outlet blocked by
snow, leaves, etc.
Clear area
outside
house or in
ventilated
crawl space
YES
NO
NO
NO
NO
Use only duct materials specified
by manufacturer (preferably with
short run or mainly straight duct,
except small dip for cold air trap
which will help prevent flow of cold air).
Factory-built
fireplace
Figure 7.2 Outside Combustion Air Placement
Figure 7.1 Outside Air Kit Installation
• The outside air kit can only be installed on the left side of
the appliance.
• Refer to the installation instructions provided with the
kit.
Note: the outside air kit inlet thimble should be positioned
in a manner that will not allow snow, leaves, etc. to block
the inlet. A 3 ft. (.91 m) minimum height difference must be
maintained from the top of the uppemost chimney section to
the outside combustion air inlet. Reference Section 2.
Fire Risk
Asphyxiation Risk
Do not draw outside combustion air from:
• Wall, floor or ceiling cavity.
• Enclosed space such as an attic or
garage.
• Close proximity to exhaust vents or
chimneys.
Fumes or odor may result.
WARNING
Risk of Smoke Spillage
Outside air inlet must be located to prevent blockage
from:
• Leaves
• Snow/ice
• Other debris
Blockage may cause combustion air starvation.
CAUTION

Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07 17
B. Gas and Electrical Connections
Ensure that gas and electrical connections are installed at
this time. Refer to Sections 9 and 10.
Note: Once appliance is set up for top or rear venting, it
CANNOT be changed at a later time.
Do NOT notch into the framing around the appliance
spacers.
CAUTION
Nailing Flanges
(both sides)
Figure 7.3 Proper Positioning, Leveling and Securing of an
Appliance
C. Securing and Leveling Appliance
The diagram shows how to properly position, level, and se-
cure the appliance (see Figure 7.3). Nailing tabs are pro-
vided to secure the appliance to the framing members.
• Place the appliance into position.
• Level the appliance from side to side and front to back.
• Shim the appliance as necessary. It is acceptable to use
wood shims.
• Bend out nailing tabs on each side.
• Keep nailing tabs flush with the framing.
• Secure the appliance to the framing by using nails or
screws through the nailing tabs.
Fire Risk!
• Prevent contact with sagging, loose
insulation.
• Do NOT install against combustible
materials such as exposed insulation,
plastic and insulation backer.
WARNING

18 Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07
Tabs
A. Assemble Vent Sections
This B-Vent appliance requires 5 in. B-vent double-wall pipe.
Follow the pipe manufacturer’s installation guidelines when
installing the appliance. This will ensure proper operation
and prevent safety hazards.
8
8 Installing Vent Pipe
Fire Risk
Exhaust Fumes Risk
Impaired Performance of Appliance.
• Assemble pipe sections per B-Vent
manufacturer’s instructions.
• Use support tabs for screws.
• Screws must not exceed 1 in. long and
must not penetrate inner lining.
• Pipe may separate if not properly
joined.
WARNING
Figure 8.1 Attaching Vent to Firebox
B. Attach Vent to Firebox Assembly
Three tabs extend from appliance collar shield. Attach tabs
to first section of B-vent pipe using self-tapping 1/4 in. screws
supplied with appliance. See Figure 8.1.
C. Securing Vent Sections
Secure vent sections with vent supports following B-vent
manufacturer’s instructions.
Fire Risk
Explosion Risk
Asphyxiation Risk
Use vent run supports per vent manufacturer’s
installation instructions.
Connect vent sections per vent manufacturer’s
installation instructions.
• Maintain all clearances to combustibles.
• Maintain specified slope (if required).
Improper support may allow vent to sag or
separate.
WARNING

Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07 19
A. Fuel Conversion
Before making gas connections ensure appliance being in-
stalled is compatible with the available gas type.
Any natural or propane gas conversions necessary to meet
the appliance and locality needs must be made by a quali-
fied technician using Hearth & Home Technologies specified
and approved parts.
B. Gas Pressure
Proper input pressures are required for optimum appliance
performance. Gas line sizing requirements need to be made
following NFPA51.
C. Gas Connection
Refer to Reference Section 16 for location of gas line access
in appliance.
Note: Have the gas supply line installed in accordance
with local building codes, if any. If not, follow ANSI
223.1. Installation should be done by a qualified installer
approved and/or licensed as required by the locality. (In
the Commonwealth of Massachusetts installation must be
performed by a licensed plumber or gas fitter.)
Note: A listed (and Commonwealth of Massachusetts
approved) 1/2 in. (13 mm) T-handle manual shut-off valve
and flexible gas connector are connected to the 1/2 in.
(13 mm) control valve inlet.
• If substituting for these components, please consult
local codes for compliance.
Pressure requirements for appliance are shown in table be-
low. Minimum pressures must be met when other household
gas appliances are operating.
Pressure Natural Gas Propane
Minimum Inlet Pressure 5.0 in. w.c. 11.0 in. w.c.
Maximum Inlet Pressure 7.0 in. w.c. 14.0 in. w.c.
Manifold Pressure 3.5 in. w.c. 10.0 in. w.c.
WARNING
Gas Leak Risk
• Support control when attaching pipe to
prevent bending gas line.
Fire Risk
Explosion Risk
Verify inlet pressures.
• High pressure may cause overfire
condition.
• Low pressure may cause explosion.
• Verify minimum pressures when other
household gas appliances are operating.
Install regulator upstream of valve if line
pressure is greater than 1/2 psig.
WARNING
9
9 Gas Information
Fire Risk
Explosion Risk
High pressure will damage valve.
• Disconnect gas supply piping BEFORE
pressure testing gas line at test pressures
above 1/2 psig.
• Close the manual shutoff valve BEFORE
pressure testing gas line at test pressures
equal to or less than 1/2 psig.
WARNING
Note: Gas line may be run from either side of appliance
using one of the knockouts provided. Hole in outer shell
NOT to exceed 2-1/2 in. and should never penetrate the
firebox.
Note: The gap between supply piping and gas access hole
may be caulked with high temperature caulk or stuffed
with non-combustible, unfaced insulation to prevent cold
air infiltration.

20 Heatilator • Novus BV-Mesh • 4031-553 Rev F • 11/07
WARNING
Fire Risk
Explosion Risk
• Gas build-up during line purge may
ignite.
• Purge should be performed by qualified
technician.
• Ensure adequate ventilation.
• Ensure there are no ignition sources such
as sparks or open flames.
WARNING
CHECK FOR GAS LEAKS
Fire Risk
Explosion Risk
Asphyxiation Risk
• Check all fittings and connections.
• Do not use open flame.
• After the gas line installation is complete,
all connections must be tightened and
checked for leaks with a commercially
available, non-corrosive leak check
solution. Be sure to rinse off all leak check
solution following testing.
Fittings and connections may have loosened
during shipping and handling.
D. High Altitude Installations
U.L. listed gas appliances are tested and approved without
requiring changes for elevations from 0 to 2000 ft in the USA
and Canada.
When installing this appliance at an elevation above 2000 ft,
it may be necessary to decrease the input rating by chang-
ing the existing burner orifice to a smaller size. Input rate
should be reduced by 4% for each 1000 ft above a 2000 ft
elevation in the U.S.A., or 10% for elevations between 2000
and 4500 ft in Canada. If the heating value of the gas has
been reduced, these rules do not apply. To identify the prop-
er orifice size, check with the local gas utility.
If installing this appliance at an elevation above 4500 ft (in
Canada), check with local authorities.
• Ensure that gas line does not come in contact with
outer wrap of appliance. Follow local codes.
• Incoming gas line should be piped into the valve
compartment and connected to the 1/2 in. connection
on the manual shutoff valve.
• A small amount of air will be in the gas supply lines.
When first lighting appliance it will take a short time
for air to purge from lines. When purging is complete
the appliance will light and operate normally.
WARNING
Fire Risk
Explosion Risk
Do NOT change the valve settings.
• This valve has been preset at the
factory.
• Changing valve settings may result in fire
hazard or bodily injury.