Hearth and Home Technologies CNXT4236IT, CNXT4842ILH, CNXT4236IH, CNXT4842IH, CNXT4842ILT User Manual

Model(s):

CNXT4236IT CNXT4842IT

CNXT4236IH CNXT4842IH

CNXT4236ILT CNXT4842ILT

CNXT4236ILH CNXT4842ILH

Direct Vent Gas Appliance

Owner’s Manual

Installation and Operation

CAUTION

DO NOT DISCARD THIS MANUAL

•

• Important operating and
maintenance instructions
included.

Read, understand and follow
these instructions for safe
installation and operation.

WARNING

If the information in these instruc­tions is not followed exactly, a
fi re may result causing property
damage, personal injury, or death.

• Do not store or use gasoline or other fl am-
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 fi re department.

• Installation and service must be performed
by a qualifi ed installer, service agency, or

the gas supplier.

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.

DO NOT

DISCARD

•

Leave this manual with
party responsible for
use and operation.

WARNING

HOT SURFACES!

Glass and other surfaces are hot during
operation and cool down.

Hot glass will cause burns.

• Do not touch glass until it is cooled

• NEVER allow children to touch glass

• Keep children away

• CAREFULLY SUPERVISE children in same room as
appliance.

• Alert children and adults to hazards of high
temperatures.

High temperatures may ignite clothing or other
fl ammable materials.

• Keep clothing, furniture, draperies and other combustibles
away.

This appliance has been supplied with an integral
barrier to prevent direct contact with the fi xed 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.

In the Commonwealth of Massachusetts installation must
be performed by a licensed plumber or gas fi tter;

See Table of Contents for location of additional
Commonwealth of Massachusetts requirements.

Installation and service of this appliance should be performed
by qualifi ed personnel. Hearth & Home Technologies suggests
NFI certifi ed or factory-trained professionals, or technicians
supervised by an NFI certifi ed professional.

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/08 1

Read this manual before installing or operating this appliance.

Please retain this owner’s manual for future reference.

A. Congratulations

Congratulations on selecting a Heatilator gas fi replace, an
elegant and clean alternative to wood burning fi replaces.
The Heatilator gas fi replace you have selected is designed
to provide the utmost in safety, reliability, and effi ciency.

As the owner of a new fi replace, 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.

Homeowner Reference Information

This owner’s manual should be retained for future reference.
We suggest that 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 fi replace will give you years of
durable use and trouble-free enjoyment. Welcome to the
Heatilator family of fi replace products!

We recommend that you record the following pertinent
information about your fi replace.

Model Name: ___________________________________________ Date purchased/installed: __________________

Serial Number: __________________________________________ Location on fi replace: _____________________

Dealership purchased from: _______________________________ Dealer Phone: __________________________

Notes: _______________________________________________________________________________________

_____________________________________________________________________________________________

Listing Label Information/Location

Hearth & Home Technologies Inc

1915 W. Saunders Street
Mt. Pleasant, IA 52641

Model #

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.

XXXXXX

The model information regarding your specifi c fi replace can be found on
the rating plate usually located in the control area of the fi replace.

Gas Type

SERIAL
NO. DE SÉRIE

Serial #

XXXXXXXXX

XXXX

CERTIFIED

FOR CANADA

CERTIFIÉ POUR LE

CANADA

Orifice
Size

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/082

Safety Alert Key:

• DANGER! Indicates a hazardous situation which, if not avoided will result in death or serious injury.

• WARNING! Indicates a hazardous situation which, if not avoided could result in death or serious injury.

• CAUTION! Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.

• NOTICE: Used to address practices not related to personal injury.

Table of Contents

A. Congratulations 2
B. Warranty 5

1 Listing and Code Approvals

A. Appliance Certifi cation 7
B. Ceramic Glass Specifi cations 7
C. BTU Specifi cations 7
D. High Altitude Installations 7
E. Non-Combustible Materials Specifi cation 7
F. Combustible Materials Specifi cation 7
G. Electrical Codes 7
H. Requirements for
the Commonwealth of Massachusetts 8

User Guide

2 Operating Instructions

A. Gas Fireplace Safety 9
B. Your Fireplace 9
C. Fan Kit (optional) 10
D. Clear Space 10
E. Decorative Doors and Fronts 10
F. Fixed Glass Assembly 10
G. Remote Controls, Wall Controls and
Wall Switches 10
H. Before Lighting Fireplace 10
I. Lighting Instructions (IPI) 11
J. After Fireplace is Lit 12
K. Frequently Asked Questions 12

3 Maintenance and Service

A. Maintenance Tasks-Homeowner 13
B. Maintenance Tasks-Qualifi ed Service Technician 14

Installer Guide

4 Getting Started

A. Typical Appliance System 15
B. Design and Installation Considerations 16
C. Tools and Supplies Needed 16
D. Inspect Appliance and Components 16

5 Framing and Clearances

A. Selecting Appliance Location 17
B. Constructing the Appliance Chase 18
C. Clearances 18
D. Mantel and Wall Projections 19

6 Termination Locations

A. Vent Termination Minimum Clearances 20

7 Vent Information and Diagrams

A. Approved Pipe 22
B. Vent Table Key 22
C. Use of Elbows 22
D. Measuring Standards 22
E. Vent Diagrams 23
F. Installing Vertical Termination Baffl e 32

8 Vent Clearances and Framing

A. Pipe Clearances to Combustibles 34
B. Wall Penetration Framing 34
C. Install the Ceiling Firestop 35
D. Install Attic Insulation Shield 36

9 Appliance Preparation

A. Convert from Top Vent to Rear Vent 37
B. Securing and Leveling the Appliance 41

10 Installing Vent Pipe

A. Assemble Pipe Sections (DVP Only) 42
B. Assemble Vent Sections (SLP Only) 43
C. Assemble Slip Sections 44
D. Secure the Vent Sections 44
E. Disassemble Vent Sections 45
F. Install Decorative Ceiling Components (SLP only) 45
G. Install Metal Roof Flashing 46
H. Assemble and Install Storm Collar 47
I. Install RF4-8 48
J. Installing Vertical Termination Cap 49
K. Installing Decorative Wall Components (SLP only) 49
L. Heat Shield Requirements for
Horizontal Termination 49
M. Install Horizontal Termination Cap 50

11 Gas Information

A. Fuel Conversion 51
B. Gas Pressure 51
C. Gas Connection 51
D. High Altitude Installations 51

12 Electrical Information

A. Wiring Requirements 52
B. Intellifi re Ignition System Wiring 52
C. Electrical Service and Repair 52
D. Junction Box Installation 52
E. WSK-MLT Multifunction Wall Switch 53
F. Install the Flame Solenoid 55
G. Hook up the Temperature Sensor Switch for Fan 55
H. Install the Remote Cover Plate 56
I. WSK-MLT Operating Instructions 57
J. Setting Flame Height/Manifold Pressure 57
K. Wall Switch Button Operation 57

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/08 3

13 Finishing

A. Mantel and Wall Projections 59
B. Facing Material 59

14 Appliance Setup

A. Remove Glass Assembly 60
B. Remove the Shipping Materials 60
C. Clean the Appliance 60
D. Accessories 60
E. Heat-Zone-Gas 60
F. Lava Rock, Vermiculite, Rockwool Placement 60
G. Log Assembly 61
H. Fixed Glass Assembly 62
I. Install Trim and/or Surrounds 62
J. Install Hood 62
K. Air Shutter Setting 62

15 Troubleshooting

A. Intellifi re Ignition System 63

16 Reference Materials

A. Appliance Dimension Diagram 65
B. Vent Components Diagrams 66
C. Service Parts 73
D. Optional Components 79
E. Contact Information 80

 = Contains updated information.

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/084

B. Warranty

Hearth & Home Technologies LIMITED WARRANTY

Hearth & Home Technologies (“HHT”) and its respective brands extends the following warranty for HHT gas, wood,
pellet and electric appliances purchased from an authorized HHT dealer and installed in the United States of America or
Canada. Warranty starts with date of purchase by the original owner (End User) except as noted for replacement parts.

Warranty Period HHT Manufactured Appliances and Venting

Parts Labor Gas Wood Pellet

1 Year XXXXXX

EPA

Wood

Electric Venting

Components Covered

All Parts and Material Except

as covered by Conditions,

Exclusion, and Limitations listed

XX

2 years

3 years X Firepots

5 years 3 years X X Castings & Baffl es

7 years 3 years X X X

10

years

Limited

Lifetime

1 year X Burners, Logs & Refractory

1 year X Firebox & Heat Exchanger

90 Days XXXXXX All Replacement Parts

XXXX Blowers

X Molded Refractory Panels

Igniters, Electronic

Components, and Glass

Firebox, HHT Chimney,

Termination & Heat

Exchanger

See Conditions, Exclusions, and limitations. 9-01-08

CONDITIONS, EXCLUSIONS & LIMITATION OF LIABILITY

 This warranty applies to the original owner and is transferable up to two years from date of purchase to the new

homeowner, provided the purchase was made through an authorized dealer or distributor of HHT, and the appliance
remains in its original place of installation.

 The maximum amount recoverable under this warranty is limited to the purchase price of the product.

 In no event shall HHT be liable for any incidental or consequential damages caused by defects in the product.

 Adjustments, regular maintenance, cleaning and temporary repairs, or the failure to duplicate the problem in the home

is not covered under this warranty.

4021-645A 09-01-08 Page 1 of 2

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/08 5

B. Warranty (continued)

This limited warranty does not extend to or include surface fi nish on the appliance or terminations, door gasketing, glass
gasketing, glass discoloration, fi rebrick, pellet logs, kaowool or other ceramic insulating materials. Rust and/or corrosion
on any of the metal surfaces, cast iron components, baffl es, fi repots, doors, or fi rebox area are not covered by this
warranty.
 Noise resulting from minor expansion, contraction, or movement of certain parts is normal and complaints related to

this noise are not covered by this warranty.

 HHT’s obligation under this warranty does not extend to damages resulting from: (1) installation, operation or

maintenance of the appliance not in accordance with the installation instructions; operating instructions and the
listing agent identifi cation label furnished with the appliance; (2) installation which does not comply with local building
codes; (3) shipping, improper handling, improper operation, abuse, misuse, accident or unworkmanlike repairs; (4)
environmental conditions, inadequate ventilation or drafting caused by tight sealing construction of the structure
or handling devices such as exhaust fans or forced air furnaces or other such causes; (5) use of fuels other than
those specifi ed in the operating instructions; (6) installation or use of components not supplied with the appliance or
any other components not expressly authorized and approved by HHT; and/or (7) modifi cation of the appliance not
expressly authorized and approved by HHT in writing.

 This warranty does not apply to non-HHT venting components, hearth components or other accessories used in

conjunction with the installation of this product.

 This warranty is void if the appliance has been over-fi red or operated in atmospheres contaminated by chlorine,

fl uorine, or other damaging chemicals the appliance is subject to prolonged periods of dampness or condensation, or

there is any damage to the appliance or other components due to water or weather damage which is the result of, but
not limited to, improper chimney or venting installation.

 HHT’s liability under this warranty is limited to the replacement and repair of defective components or workmanship

during the applicable period. HHT may fully discharge all of its obligations under such warranties by repairing the
defective component(s) at HHT’s discretion. Shipping costs are not covered under this warranty.

 Some states do not allow exclusions or limitation of incidental or consequential damages, so those limitations may not

apply to you. This warranty gives you specifi c rights; you may also have other rights, which vary from state to state.

 EXCEPT TO THE EXTENT PROVIDED BY LAW, HHT MAKES NO EXPRESS WARRANTIES OTHER THAN THE

WARRANTY SPECIFIED HEREIN. THE DURATION OF ANY IMPLIED WARRANTY IS LIMITED TO DURATION OF
THE WARRANTY SPECIFIED ABOVE.

This Limited Warranty is effective on all HHT appliances sold after September 01, 2008 and supersedes any and all
warranties currently in existence.

If warranty service is needed, you should contact your installing dealer. If the installing dealer is unable to provide
necessary parts or components, contact the nearest authorized HHT dealer or supplier.

4021-645A 09-01-08 Page 2 of 2

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/086

1

1

Listing and Code Approvals

A. Appliance Certifi cation

MODELS: CNXT4236IT, CNXT4842IT, CNXT4236IH,

CNXT4842IH, CNXT4236ILT, CNXT4842ILT,
CNXT4236ILH, CNXT4842ILH

LABORATORY: Underwriters Laboratories, Inc. (UL)

TYPE: Vented Gas Fireplace Heaters

STANDARD: ANSI Z21.88-2005•CSA2.33-2005•UL307B

This product is listed to ANSI standards for “Vented Gas
Fireplace Heaters” and applicable sections of “Gas Burn­ing Heating Appliances for Manufactured Homes and
Recreational Vehicles”, and “Gas Fired Fireplaces for Use
at High Altitudes”.

NOTICE: 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.

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.

D. High Altitude Installations

NOTICE: If the heating value of the gas has been reduced,
these rules do not apply. Check with your local gas utility or
authorities having jurisdiction.

When installing above 2000 feet elevation:

• In the USA: Reduce input rate 4% for each 1000 feet
above 2000 feet.

• In CANADA: Reduce input rate 10% for elevations
between 2000 feet and 4500 feet. Above 4500 feet,
consult local gas utility.

Check with your local gas utility to determine proper
orifi ce size.

E. Non-Combustible Materials Specifi cation

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,

Standard Test Method for Behavior of Materials in a
Vertical Tube Furnace at 750 ºC and UL763 shall be

considered non-combustible materials.

B. Ceramic Glass Specifi cations

This appliance is equipped with 5 mm ceramic glass.
Replace glass with 5 mm ceramic glass. Please contact
your dealer for replacement glass.

C. BTU Specifi cations

CNXT Series CNXT4236 CNXT4842

IPI

Max/Min Input Rate (NG) 40,000/27,500 45,000/31,000

Max/Min Input Rate (LP) 36,000/26,500 40,000/29,000

Orifi ce Size (NG) .120 in./3.05 mm .128 in./3.25 mm

Orifi ce Size (LP) .068 in./1.73 mm .073 in./1.85 mm

F. Combustible Materials Specifi cation

Materials made of or surfaced with wood, compressed
paper, plant fi bers, plastics, or other material that can ig-
nite and burn, whether fl ame proofed or not, or plastered
or unplastered shall be considered combustible materials.

G. Electrical Codes

NOTICE: This appliance must be electrically wired
and grounded in accordance with local codes or, in the
absence of local codes, with National Electric Code

ANSI/NFPA 70-latest edition or the Canadian Electric
Code CSA C22.1.

• A 110-120 VAC circuit for this product must be protected
with ground-fault circuit-interrupter protection, in
compliance with the applicable electrical codes, when
it is installed in locations such as in bathrooms or near
sinks.

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/08 7

Note: The following requirements reference various
Massachusetts and national codes not contained in this
document.

H. Requirements for the Commonwealth of
Massachusetts

For all side wall horizontally vented gas fueled equipment
installed in every dwelling, building or structure used in
whole or in part for residential purposes, including those
owned or operated by the Commonwealth and where the
side wall exhaust vent termination is less than seven (7)
feet above fi nished grade in the area of the venting, in-
cluding but not limited to decks and porches, the following
requirements shall be satisfi ed:

Installation of Carbon Monoxide Detectors

At the time of installation of the side wall horizontal
vented gas fueled equipment, the installing plumber or
gas fi tter shall observe that a hard wired carbon mon-
oxide detector with an alarm and battery back-up is
installed on the fl oor level where the gas equipment is
to be installed. In addition, the installing plumber or gas
fi tter shall observe that a battery operated or hard wired
carbon monoxide detector with an alarm is installed on
each additional level of the dwelling, building or struc­ture served by the side wall horizontal vented gas fueled
equipment. It shall be the responsibility of the property
owner to secure the services of qualifi ed licensed profes-
sionals for the installation of hard wired carbon monoxide
detectors.

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
fl oor level.

In the event that the requirements of this subdivision can
not be met at the time of completion of installation, the
owner shall have a period of thirty (30) days to comply
with the above requirements; provided, however, that dur­ing said thirty (30) day period, a battery operated carbon
monoxide detector with an alarm shall be installed.

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 certifi ed.

Signage

A metal or plastic identifi cation 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 appliance or equipment. The sign shall
read, in print size no less than one-half (1/2) in. in size,

“GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL
OBSTRUCTIONS”.

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.

Exemptions

The following equipment is exempt from 248 CMR

5.08(2)(a)1 through 4:

• 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.

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:

• Detailed instructions for the installation of the venting
system design or the venting system components;
and

• A complete parts list for the venting system design or
venting system.

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 fl ue gases, but identi-
fi es “special venting systems”, the following requirements
shall be satisfi ed by the manufacturer:

• The referenced “special venting system” instructions
shall be included with the appliance or equipment
installation instructions; and

• The “special venting systems” shall be Product
Approved by the Board, and the instructions for that
system shall include a parts list and detailed installation
instructions.

A copy of all installation instructions for all Product Ap­proved side wall horizontally vented gas fueled equip­ment, all venting instructions, all parts lists for venting
instructions, and/or all venting design instructions shall
remain with the appliance or equipment at the completion
of the installation.

See Gas Connection section for additional Common­wealth of Massachusetts requirements.

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/088

2

User Guide

2

Operating Instructions

A. Gas Fireplace Safety

WARNING

HOT SURFACES!

Glass and other surfaces are hot
during operation and cool down.

Hot glass will cause burns.

• Do not touch glass until it is cooled

• NEVER allow children to touch glass

• Keep children away

• CAREFULLY SUPERVISE children in

same room as appliance.

• Alert children and adults to hazards of high
temperatures.

High temperatures may ignite clothing or other

fl ammable materials.

• Keep clothing, furniture, draperies and other
combustibles away.

This appliance has been supplied with an integral
barrier to prevent direct contact with the fi xed 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.

• Install a physical barrier such as:

- A decorative fi rescreen.

- Adjustable safety gate.

• Install a switch lock or a wall/remote control with child
protection lockout feature.

• Keep remote controls out of reach of children.

• Never leave children alone near a hot fi replace, whether
operating or cooling down.

• Teach children to NEVER touch the fi replace.

• Consider not using the fi replace when children will be
present.

Contact your dealer for more information, or visit: www.
hpba.org/staysafe.

To prevent unintended operation when not using your
fi replace for an extended period of time (summer months,
vacations, trips, etc):

• Remove batteries from remote controls.

• Turn off wall controls.

• Unplug 3 volt adapter plug and remove batteries on IPI
models.

• Turn off gas controls valve on standing pilot models.

When lighting the pilot light on fi replaces with a standing
pilot, remove the fi xed glass assembly so you can detect
presence of residual gas build-up. See Standing Pilot
Lighting instructions and Maintenance Tasks.

If you expect that small children or vulnerable adults may
come into contact with this fi replace, the following precau-
tions are recommended:

Decorative Doors

(not shown)
Section 2.E.

Fixed Glass Assembly

Grate
(not shown)
Section 3.B.

Fan Kits

Section 2.C

Clear Space
Section 2.D.

B. Your Fireplace

WARNING! DO NOT operate fi replace before reading and
understanding operating instructions. Failure to operate

fi replace according to operating instructions could cause
fi re or injury.

See Section 12.I. for operation
of the wall switch.

(not shown)
Section 2.F.

Mantel

Hearth

(not required)

Figure 2.1 General Operating Parts

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/08 9

C. Fan Kit (optional)

If desired, a fan kit may be added. Contact your dealer to
order the correct fan kit.

D. Clear Space

WARNING! DO NOT place combustible objects in front of
the fi replace or block louvers. High temperatures may start
a fi re. See Figure 2.2.

Avoid placing candles and other heat-sensitive objects on
mantel or hearth. Heat may damage these objects.

Clear space 3 ft (914 mm)
in front of appliance

F. Fixed Glass Assembly

See Section 14.

G. Remote Controls, Wall Controls and Wall
Switches

Follow the instructions supplied with the control installed
to operate your fi replace:

For safety:

• Install a switch lock or a wall/remote control with child
protection lockout feature.

• Keep remote controls out of reach of children.

See your dealer if you have questions.

H. Before Lighting Fireplace

Before operating this fi replace for the fi rst time, have a
qualifi ed service technician:

• Verify all shipping materials have been removed from
inside and/or underneath the fi rebox.

• Review proper placement of logs, rockwool and/or other
decorative materials.

• Check the wiring.

• Check the air shutter adjustment.

• Ensure that there are no gas leaks.

• Ensure that the glass is sealed and in the proper position
and that the integral barrier is in place.

Figure 2.2 Clear Space

E. Decorative Doors and Fronts

WARNING! Risk of Fire! Install ONLY doors or fronts
approved by Hearth & Home Technologies. Unapproved
doors or fronts may cause fi replace to overheat.

This fi replace has been supplied with an integral barrier to
prevent direct contact with the fi xed glass panel. DO NOT
operate the fi replace 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.

For more information refer to the instructions supplied
with your decorative door or front.

WARNING! Risk of Fire or Asphyxiation! DO NOT oper­ate fi replace with fi xed glass assembly removed.

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/0810

I. Lighting Instructions (IPI)

• For normal use, activate/deactivate your fi replace with the wall switch or remote control.

• The IPI system may be operated with two D-cell batteries. When using batteries, unplug the transformer. To prolong
battery life, remove them when using the transformer.

• If your fi replace must be deactivated for service or an extended period of time, follow the instructions below.

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/08 11

J. After Fireplace is Lit

Initial Break-in Procedure

• The fireplace should be run three to four hours
continuously on high.

• Turn the fi replace off and allow it to completely cool.

• Remove fi xed glass assembly. See Section 14.H.

• Clean fi xed glass assembly. See Section 3.

• Replace the fi xed glass assembly and run continuously
on high an additional 12 hours.

This cures the materials used to manufacture the fi re-
place.

NOTICE! Open windows for air circulation during fi replace
break-in.

• Some people may be sensitive to smoke and

odors.

• Smoke detectors may activate.

K. Frequently Asked Questions



ISSUE SOLUTIONS

Condensation on the glass

Blue fl ames

Odor from appliance

This is a result of gas combustion and temperature variations. As the appliance warms, this con­densation will disappear.

This is a result of normal operation and the fl ames will begin to yellow as the appliance is allowed
to burn for 20 to 40 minutes.

When fi rst operated, this appliance may release an odor for the fi rst several hours. This is caused
by the curing of materials from manufacturing. Odor may also be released from fi nishing materi-
als and adhesives used near the appliance. These circumstances may require additional curing
related to the installation environment.

Film on the glass

Metallic noise

Is it normal to see the pilot
fl ame burn continually?

This is a normal result of the curing process of the paint and logs. Glass should be cleaned within
3 to 4 hours of initial burning. A non-abrasive cleaner such as gas appliance glass cleaner may be
necessary. See your dealer.

Noise is caused by metal expanding and contracting as it heats up and cools down, similar to the
sound produced by a furnace or heating duct. This noise does not affect the operation or longevity
of the appliance.

In an Intellifi re ignition system it is normal to see the pilot fl ame, but it should turn off when ON/
OFF is turned to OFF. In a standing pilot system the pilot will always stay on.

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/0812

3

3

Maintenance and Service

Any safety screen or guard removed for servicing must be
replaced prior to operating the fi replace.

When properly maintained, your fi replace will give you
many years of trouble-free service. We recommend an­nual service by a qualifi ed service technician.

A. Maintenance Tasks-Homeowner

Installation and repair should be done by a qualifi ed
service technician only. The fi replace should be inspect-
ed before use and at least annually by a professional
service person.

The following tasks may be performed annually by the
homeowner. If you are uncomfortable performing any of
the listed tasks, please call your dealer for a service ap­pointment.

More frequent cleaning may be required due to lint from
carpeting or other factors. Control compartment, burner
and circulating air passageway of the fi replace must be
kept clean.

CAUTION! Risk of Burns! The fi replace should be
turned off and cooled before servicing.

Glass Cleaning

Frequency: Seasonally
By: Homeowner

Tools Needed: Protective gloves, glass cleaner, drop

cloth and a stable work surface.

CAUTION! Handle fi xed glass assembly with care.

Glass is breakable.

• Avoid striking, scratching or slamming glass

• Avoid abrasive cleaners

• DO NOT clean glass while it is hot

• Prepare a work area large enough to accommodate fi xed
glass assembly and door frame by placing a drop cloth
on a fl at, stable surface.

Note: Fixed glass assembly and gasketing may have
residue that can stain carpeting or fl oor surfaces.

• Remove door or decorative front from fi replace and set
aside on work surface.

• See Section 14.H. for instructions to remove fi xed glass
assembly.

• Clean glass with a non-abrasive commercially available
cleaner.

- Light deposits: Use a soft cloth with soap and water

- Heavy deposits: Use commercial fi replace glass cleaner
(consult with your dealer)

• Carefully set fi xed glass assembly in place on fi replace.
Hold glass in place with one hand and secure glass
latches with the other hand.

• Reinstall door or decorative front.

Doors, Surrounds, Fronts

Frequency: Annually
By: Homeowner
Tools needed: Protective gloves, stable work surface

• Assess condition of screen and replace as necessary.

• Inspect for scratches, dents or other damage and repair
as necessary.

• Check that louvers are not blocked.

• Vacuum and dust surfaces.

Remote Control

Frequency: Seasonally
By: Homeowner
Tools needed: Replacement batteries and remote control

instructions.

• Locate remote control transmitter and receiver.

• Verify operation of remote. Refer to remote control
operation instructions for proper calibration and setup
procedure.

• Place batteries as needed in remote transmitters and
battery-powered receivers.

• Place remote control out of reach of children.

If not using your fi replace for an extended period of time
(summer months, vacations/trips, etc), to prevent unin­tended operation:

• Remove batteries from remote controls.

• Unplug 3 volt adapter plug on IPI models.

Venting

Frequency: Seasonally
By: Homeowner
Tools needed: Protective gloves and safety glasses.

• Inspect venting and termination cap for blockage or
obstruction such plants, bird nests, leaves, snow, debris,
etc.

• Verify termination cap clearance to subsequent
construction (building additions, decks, fences, or
sheds). See Section 6.

• Inspect for corrosion or separation.

• Verify weather stripping, sealing and fl ashing remains
intact.

• Inspect draft shield to verify it is not damaged or
missing.

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/08 13

B. Maintenance Tasks-Qualifi ed Service
Technician

The following tasks must be performed by a qualifi ed
service technician.

Gasket Seal and Glass Assembly Inspection

Frequency: Annually
By: Qualifi ed Service Technician
Tools needed: Protective gloves, drop cloth and a stable

work surface.

• Inspect gasket seal and its condition.

• Inspect fi xed glass assembly for scratches and nicks
that can lead to breakage when exposed to heat.

• Confi rm there is no damage to glass or glass frame.
Replace as necessary.

• Verify that fi xed glass assembly is properly retained and
attachment components are intact and not damaged.
Replace as necessary.

Logs

Frequency: Annually
By: Qualifi ed Service Technician
Tools needed: Protective gloves.

• Inspect for damaged or missing logs. Replace as
necessary. Refer to Section 14 for log placement
instructions.

• Verify correct log placement and no fl ame impingement
causing sooting. Correct as necessary.

Firebox

Frequency: Annually
By: Qualifi ed Service Technician

Burner Ignition and Operation

Frequency: Annually
By: Qualifi ed Service Technician
Tools needed: Protective gloves, vacuum cleaner, whisk

broom, fl ashlight, voltmeter, indexed drill bit set, and a
manometer.

• Verify burner is properly secured and aligned with pilot
or igniter.

• Clean off burner top, inspect for plugged ports, corrosion
or deterioration. Replace burner if necessary.

• Replace rockwool with new dime-size pieces. DO NOT
block ports or obstruct lighting paths. Refer to Section
14 for proper rockwool placement.

• Verify batteries have been removed from battery back­up IPI systems to prevent premature battery failure or
leaking.

• Check for smooth lighting and ignition carryover to all
ports. Verify that there is no ignition delay.

• Inspect for lifting or other fl ame problems.

• Verify air shutter setting is correct. See Section 14 for
required air shutter setting. Verify air shutter is clear of
dust and debris.

• Inspect orifi ce for soot, dirt and corrosion. Verify orifi ce
size is correct. See Service Parts List for proper orifi ce
sizing.

• Verify manifold and inlet pressures. Adjust regulator as
required.

• Inspect pilot fl ame pattern and strength. See Figure 3.1
for proper pilot fl ame pattern. Clean or replace orifi ce
spud as necessary.

• Inspect IPI fl ame sensing rod for soot, corrosion and
deterioration. Clean with emery cloth or replace as
required.

• Verify IPI millivolt output. Replace as necessary.

Tools needed: Protective gloves, sandpaper, steel wool,
cloths, mineral spirits, primer and touch-up paint.

• Inspect for paint condition, warped surfaces, corrosion
or perforation. Sand and repaint as necessary.

• Replace fi replace if fi rebox has been perforated.

Control Compartment and Firebox Top

Frequency: Annually
By: Qualifi ed Service Technician
Tools needed: Protective gloves, vacuum cleaner, dust

cloths

• Vacuum and wipe out dust, cobwebs, debris or pet hair.
Use caution when cleaning these areas. Screw tips that
have penetrated the sheet metal are sharp and should
be avoided.

• Remove all foreign objects.

• Verify unobstructed air circulation.

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/0814

Figure 3.1 IPI Pilot Flame Patterns

4

4

A. Typical Appliance System

NOTICE: Illustrations and photos refl ect typical installations and are for design purposes only. Illustrations/diagrams are not
drawn to scale. Actual product may vary from pictures in manual

Getting Started

Installer Guide

Note: Dual venting confi gurations
ARE NOT allowed. Appliance
MUST be vented EITHER vertically
OR horizontally.

Noncombustible roof
flashing maintains minimum
clearance around pipe
(SECTION 10)

Vent Pipe
(SECTIONS 7, 8, 10)

Ceiling Firestop
on floor of attic
(SECTION 8)

Framing/Header
(SECTION 5)

Horizontal

Termination

Cap

(SECTION )

Vertical Termination Cap

(SECTION 10)

Storm Collar
(SECTION 10)

Vent pipe penetrates roof,
preferably without affecting
roof rafters
(SECTION 8)

Attic insulation shield (not shown) must be used here to
keep insulation away from vent pipe if attic is insulated.
(SECTION 8)

Framing Headed off
in Ceiling Joists
(SECTION 8)

Optional

Wall Switch

(SECTION 14)

Mantel & Mantel Leg
(SECTION 13)

Surround

Gas Line
(SECTION 11)

Figure 4.1 Typical System

Hearth Extension
(not required)

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/08 15

B. Design and Installation Considerations

Heatilator direct vent gas appliances are designed to op­erate with all combustion air siphoned from outside of the
building and all exhaust gases expelled to the outside. No
additional outside air source is required.

Installation MUST comply with local, regional, state and
national codes and regulations. Consult insurance carrier,
local building inspector, fi re offi cials or authorities having
jurisdiction over restrictions, installation inspection and
permits.

Before installing, determine the following:

• Where the appliance is to be installed.

• The vent system confi guration to be used.

• Gas supply piping.

• Electrical wiring requirements.

• Framing and fi nishing details.

• Whether optional accessories—devices such as a fan,

wall switch, or remote control—are desired.

Improper installation, adjustment, alteration, service or
maintenance can cause injury or property damage. For
assistance or additional information, consult a qualifi ed
service technician, service agency or your dealer.

C. Tools and Supplies Needed

Before beginning the installation be sure that the following
tools and building supplies are available.

Tape measure Framing material
Pliers High temperature caulking

material
Hammer Phillips screwdriver
Gloves Framing square
Voltmeter Electric drill and bits (1/4 in.)
Plumb line Safety glasses
Level Reciprocating saw
Manometer Flat blade screwdriver
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 Appliance and Components

• Carefully remove the appliance and components from
the packaging.

• The vent system components and decorative doors and
fronts may be shipped in separate packages.

• If packaged separately, the log set and appliance grate
must be 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 benefi t.

WARNING! Risk of Fire or Explosion! Damaged parts
could impair safe operation. DO NOT install damaged, in­complete or substitute components. Keep appliance dry.

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.

• Modifi cation 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 fi re hazard.

WARNING! Risk of Fire, Explosion or Electric Shock!
DO NOT use this appliance if any part has been under wa-

ter. Call a qualifi ed service technician to inspect the appli-
ance and to replace any part of the control system and/or
gas control which has been under water.

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/0816

5

5

n

Framing and Clearances

A. Selecting Appliance Location

When selecting a location for the appliance it is important
to consider the required clearances to walls (see Figure

5.1).

WARNING! Risk of Fire or Burns! Provide adequate
clearance around air openings and for service access. Due

to high temperatures, the appliance should be located out
of traffi c and away from furniture and draperies.

1/2 in. (13 mm) min.

appliance to

combustibles

B

B

D

A

Top Vent

One 90° elbow

Horiz Term

Drywall

NOTICE: Illustrations refl ect typical installations and are
FOR DESIGN PURPOSES ONLY. Illustrations/diagrams
are not drawn to scale. Actual installation may vary due to
individual design preference.

1 in. (25 mm) mi

pipe to

combustibles

E

A
G

Alcove

Installation

C

H

One 45° elbow

Horiz Term

E

1/2 in. (13 mm) min.

appliance to

combustibles

A

Rear vent

F

1 in. (25 mm) min.

pipe to combustibles

In addition to these framing dimensions, also reference the
following sections:

• Clearances and Mantel Projections (Section 3.C.)

• Vent Clearances and Framing (Section 6)

Rear Vent

One 90° elbow

Vert Term

A

F

No elbows
Horiz Term

A

Rear Vent

Two 90° elbows

Horiz Term

C

A

I

Model # A B C D E F G H I

CNXT4236 in. 42 50 5/8 23 71 5/8 50 5/8 52 5/8 43 48 59 3/4

mm 1067 1286 584 1819 1286 1337 1092 1219 1518

CNXT4842 in. 48 55 1/4 23 78 1/4 55 1/4 55 1/4 49 48 59 3/4

mm 1219 1403 584 1988 1403 1403 1245 1219 1518

I

Figure 5.1 Appliance Locations

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/08 17

B. Constructing the Appliance Chase

A chase is a vertical box-like structure built to enclose the
gas appliance and/or its vent system. In cooler climates
the vent should enclosed inside the chase.

NOTICE:

fi restops and construction of the chase may vary with the
type of building. These instructions are not substitutes for the
requirements of local building codes. Therefore, you MUST
check local building codes to determine the requirements
to these steps.

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 fl oor of the chase
should be insulated. Vapor and air infi ltration barriers
should be installed in the chase as per regional codes for
the rest of the home. Additionally, in regions where cold
air infi ltration may be an issue, the inside surfaces may
be sheetrocked and taped for maximum air tightness.

Treatment of ceiling fi restops and wall shield

1/2 in. (13 mm)

To further prevent drafts, the wall shield and ceiling fi re-
stops should be caulked with high temperature caulk to
seal gaps. Gas line holes and other openings should be
caulked with high temp caulk or stuffed with unfaced insu­lation. If the appliance is being installed on a cement slab,
a layer of plywood may be placed underneath to prevent
conducting cold up into the room.

C. Clearances

NOTICE: Install appliance on hard metal or wood surfaces
extending full width and depth. DO NOT install directly on
carpeting, vinyl, tile or any combustible material other than
wood.

WARNING! Risk of Fire! Maintain specifi ed air space
clearances to appliance and vent pipe:

• Insulation and other materials must be secured to
prevent accidental contact.

• Failure to maintain airspace may cause overheating and
a fi re.

Combustible flooring may be installed next
to the front of the appliance.

30 in.

(762 mm)

to ceiling

36 in.

(914 mm)

Combustible Object

Figure 5.2 Clearances to Combustibles

1/2 in.
(13 mm)

0 in. to level

of standoffs

0 in. to
floor

Drywall

0 in.

D

B

C

A

Note: If the inside of the framed cavity is to be fi nished, the
framing dimensions must include the fi nished surface. If
drywall is to be attached to the rear wall, the depth must
be measured from the drywall surface.

A

Rough

Opening

Model

CNXT4236 in. 42 38 3/4 23 10

CNXT4842 in. 48 38 3/4 23 10

(Width)

mm 1067 984 584 254

mm 1219 984 584 254

B

Rough

Opening

(Height)

C

Rough

Opening

(Depth)

D

Rough

Opening

(DVP Pipe)

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/0818

D. Mantel and Wall Projections

WARNING! Risk of Fire! Comply with all minimum clear­ances to combustibles as specifi ed. Framing or fi nishing
material closer than the minimums listed must be construct­ed entirely of noncombustible materials (i.e., steel studs,
concrete board, etc).

Mantels

14

13

3

10-1/4

6

12

11

10

9

8

7

6

5

4

12-1/2

11-3/4

11

14-3/4

14

13-1/4

16-1/4

15-1/2

18-1/2

17-3/4

17

30 in. minimum

16

15

19-1/4

to ceiling

18

17

20-3/4

20

Measured from top of hood (in inches)

Figure 5.3 Minimum Vertical and Maximum Horizontal Dimensions

Mantel Legs or Wall Projections

Top o f
Appliance

A

B

Perpendicular Wall

1 in. (25 mm) min.

A

to perpendicular wall
3-1/2 in. (89 mm) min.

B

from fireplace opening
to perpendicular wall

Mantel Leg or

Drywall

Figure 5.4 Mantel Leg or Wall Projections (Acceptable on both
sides of opening)

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/08 19

6

6

Termination Locations

A. Vent Termination Minimum Clearances

24 in. min.

(610 mm)

Termination

Cap

Storm Collar

Roof

Flashing

WARNING

Fire Risk.
Maintain vent clearance to combustibles as

specifi ed.

• DO NOT pack air space with insulation or other
materials.

Failure to keep insulation or other materials away
from vent pipe may cause overheating and fi re.

Horizontal
overhang

20 in.

(508 mm)

Lowest

Discharge

Opening

12

H (min.) - Minimum height
from roof to lowest
discharge opening.

Vertical
wall

X

Roof Pitch
is X / 12

AB

6in.(minimum)upto20in.

152 mm/508 mm

20 in. and over 0 in. minimum

18 in. minimum

457 mm

Gas, Wood or Fuel Oil

Termination Cap

B

Minimum

DV = 20 in.

A *

(508 mm)

BV = 8 ft

(2.44 m)

Gas

Termination

Cap **

If using decorative cap cover(s), this distance may need to be

*

increased. Refer to the installation instructions supplied with the
decorative cap cover.

In a staggered installation with both gas and wood terminations, the

**

wood termination cap must be higher than the gas termination cap.

Perpendicular Wall

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

Figure 6.1 Minimum Height From Roof To Lowest Discharge
Opening

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/0820

Figure 6.2 Multiple Termination Caps



H

D

E

V

L

B

C

Fixed

V

Closed

V

F

B

V

Openable

B

V TERMINATION CAP

V

Fixed

Closed

J

A

B

X

Measure vertical clearances

from this surface

T

Measure horizontal clearances

from this surface.

Covered Alcove

Applications

Dimension Descriptions
A Clearance above the ground, a veranda, porch, deck or balcony - 12 in.

(30 cm) minimum. *

B Clearance to window or door that may be opened – 10,000 BTUs or less,

6 in. (15 cm) minimum; 10,000-50,000 BTUs, 9 in. (23 cm) minimum; over
50,000 BTUs, 12 in. (30 cm) minimum. *

C Clearance to permanently closed window – 12 in. (30 cm) minimum -

recommended to prevent condensation on window.

D Vertical clearance to ventilated soffi t located above the termination within

a horizontal distance of 2 ft (60 cm) from the centerline of the termination

– 18 in. (46 cm) minimum. **
E Vertical clearance to unventilated soffi t - 12 in. (30 cm) minimum. **
F Clearance to outside corner - 6 in. (15 cm) minimum.
G Clearance to inside corner - 6 in. (15 cm) minimum.
H Not to be installed above a meter/regulator assembly within 3 ft (90 cm)

horizontally* from the center line of the regulator (Canada only)
I Clearance to service regulator vent outlet – 3 ft (.91 m) U.S. minimum and

3 ft (.91 m) Canada minimum. *
J Clearance to non-mechanical air supply inlet into building or the combustion

air inlet to any other appliance – 9” (23 cm) U.S. minimum and 12 in. (30

cm) Canada minimum. *
K Clearance to mechanical air supply inlet - 3 ft (.91 m) U.S. minimum and

6 ft (1.8 m) Canada minimum. *
L Clearance above a paved sidewalk or paved driveway located on public

property - 7 ft (2.1 m) minimum.
A vent may not terminate directly above a sidewalk or paved driveway

which is located between two single family dwellings and serves both

dwellings.
M Clearance under veranda, porch, deck or balcony - 12 in. (30 cm) minimum.

* Recommended 30 in. (76 cm) for vinyl or plastic.
Only permitted if veranda, porch, deck or balcony is fully open on a

minimum of 2 sides beneath the fl oor. *
N Vertical clearance between two horizontal termination caps – 12 in. (30

cm) minimum.
O Horizontal clearance between two horizontal termination caps – 12 in. (30

cm) minimum.

Figure 6.3 Minimum Clearances for Termination

O

R

N

V

V

B

X

GAS METER

AIR SUPPLY INLET

Q

P

V

S

M

I

RESTRICTION ZONE
(TERMINATION NOT
ALLOWED)

V

V

KX

U

Service

G

V

A

V

W

lectrical

D*

V

V

U

V

Clearances to Electrical Service

P 6” - Non-vinyl sidewalls
12” – Vinyl sidewalls
Q 18” – Non-vinyl soffi t and overhang
42” – Vinyl soffi t and overhang
R 8 ft.

S

min

T

max

1 cap 3 ft 2 x S actual
2 caps 6 ft 1 x S actual
3 caps 9 ft 2/3 x S actual
4 caps 12 ft 1/2 x S actual

S

= # term caps x 3 T

min

= (2/# term caps) x S (actual)

max

U 6” min. – Clearance from sides of electrical service.
W 12” min. – Clearance above electrical service.
* As specifi ed in CGA B149 Installation Codes
Note: Local codes or regulations may require different clearances.
** Clearance required to vinyl soffi t material – 30 in. (76 cm) minimum.
Note: Location of the vent termination must not interfere with access to

the electrical service.

WARNING!
In the U.S.: Vent system termination is NOT permitted in screened porches.

You must follow side wall, overhang and ground clearances as stated in
the instructions.

In Canada: Vent system termination is NOT permitted in screened porches.

Vent system termination is permitted in porch areas with two or more sides
open. You must follow all side wall, overhang and ground clearances as
stated in the instructions.

Hearth & Home Technologies assumes no responsibility for the improper

performance of the appliance when the venting system does not meet
these requirements.

CAUTION: IF EXTERIOR WALLS ARE FINISHED WITH VINYL SIDING, IT IS SUGGESTED THAT A VINYL PROTECTOR KIT BE INSTALLED.

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/08 21

7

7

Vent Information and Diagrams

A. Approved Pipe

This appliance is approved for use with Hearth & Home
Technologies DVP and/or SLP venting systems. Refer to
Section 16B for vent component information.

DO NOT mix pipe, fi ttings or joining methods from differ-
ent manufacturers.

The pipe is tested to be run inside an enclosed wall.
There is no requirement for inspection openings at each
joint within the wall.

WARNING! Risk of Fire or Asphyxiation. This appliance
requires a separate vent. DO NOT vent to a pipe serving a
separate solid fuel burning appliance.

B. Vent Table Key

The abbreviations listed in this vent table key are used in
the vent diagrams.

Symbol Description

Vertical

12 in.

8-1/2 in.

Horizontal

On 45° runs, 1 ft (.3 m) of diagonal is equal to 8-1/2 in. (216
mm) horizontal run and 8-1/2 in. (216 mm) vertical run.

Figure 7.1 Using Two 45° Elbows

8-1/2 in.

V

V

H

H

First section (closest to appliance) of vertical length

1

Second section of vertical length

2

First section (closest to appliance) of horizontal length

1

Subsequent sections of horizontal length

2

C. Use of Elbows

Diagonal runs have both vertical and horizontal vent aspects
when calculating the effects. Use the rise for the vertical
aspect and the run for the horizontal aspect (see Figure

7.1).
Two 45º elbows may be used in place of one 90º elbow.

On 45º runs, one foot of diagonal is equal to 8-1/2 in. (216
mm) horizontal run and 8-1/2 in. (216 mm) vertical run. A
length of straight pipe is allowed between two 45º elbows
(see Figure 7.1).

D. Measuring Standards

Vertical and horizontal measurements listed in the vent
diagrams were made using the following standards.

• Pipe measurements are shown using the effective length
of pipe (see Figure 7.2).

• Horizontal terminations are measured to the outside
mounting surface (fl ange of termination cap).

• Vertical terminations are measured to bottom of
termination cap.

• Horizontal pipe installed level with no rise.

Effective

Height/Length

DVP Pipe

(see chart)

Effective

Height/Length

SLP Pipe

(see chart)

Figure 7.2 Pipe Effective Length

SLP12A 2 - 12 51 - 305

Effective Height/Length

Pipe

DVP4 4 102

DVP6 6 152
DVP12 12 305
DVP24 24 610
DVP36 36 914
DVP48 48 1219
DVP6A 3 - 6 76 - 152

DVP12A 3 - 12 76 - 305

Effective Height/Length

Pipe

SLP4 4 102

SLP6 6 152
SLP12 12 305
SLP24 24 610
SLP36 36 914
SLP48 48 1219
SLP6A 2 - 6 51 - 152

inches

inches

mm

mm

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/0822

E. Vent Diagrams

To replace the fi rst starter elbow with two 45° elbows,
refer to Figure 7.4. All other 90° elbows can be replaced
with two 45° elbows.

General Rules:

• SUBTRACT 3 ft. from the total H measurement for each
90° elbow installed horizontally.

• SUBTRACT 1-1/2 ft. from the total H measurement for
each 45° elbow installed horizontally.

• A maximum of three 90° elbows (or six 45° elbows)
may be used in any vent confi guration. Some elbows
may be installed horizontally. See Figure 7.9.

• Elbows may be placed back to back anywhere in the
system as long as the fi rst 90° elbow is a starter elbow
except as shown in Figure 7.4.

• When penetrating a combustible wall, a wall shield
fi restop must be installed.

• When penetrating a combustible ceiling, a ceiling
fi restop must be installed.

• Horizontal runs of vent do not require vertical rise;
horizontal runs may be level.

Note: The CNXT series appliances can adapt to
SLP series vent pipe when venting off the top of
the appliance. You must use a DVP-SLP24 adapter
which can only be attached to the appliance starting
collar.

When looking at horizontal termination diagrams, the
adapter is not counted as part of the minimum vertical
(V

min.) requirements.

1

Whether horizontal or vertical termination, the adapter is
counted as part of the maximum vertical limitations.

All venting rules for the vent run must still be followed.

HORIZONTAL EXAMPLE

V1 = 1 ft.

H

= 11 ft.

1

max.

DVP

1. Top Vent - Horizontal Termination

One Elbow

H

1

V1 min. V1 max. H1 max.

ft m ft m ft m
0 0.00 - - 1.5 0.46

0.5 0.15 - - 6 1.83
1 0.30 - - 11 3.35

1.5 0.46 - - 18 5.49
2 0.61 - - 25 7.62

DVP 25 7.62 25 7.62

SLP 23 7.01 23 7.01

V

V1 = 1 ft.

H

= 11 ft.

1

max

DVP-SLP24

1

SLP

VERTICAL EXAMPLE

DVP-SLP24

12 ft (3.66 m) min.

60 ft (18.29 m) max.

12 ft (3.66 m) min.

60 ft (18.29 m) max.

Adapter

You may install a DVP elbow directly on top of the
CNXT4236 and on top of the CNXT4842.

Figure 7.3

DVP

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/08 23

SLP

1. Top Vent - Horizontal Termination - (continued)

Two 45° Elbows replacing One 90° Elbow

25 ft max.

(7.62 m)

Figure 7.4

4 ft min.

(1.22 m)

Two Elbows

H

V1 min. V1 max. H1+H2 max. H1+H2+H3 max.

ft mftmftmftm

0.5 0.15 - - 6 1.83 - ­1 0.30 - - 11 3.35 11 3.35

1.5 0.46 - - 18 5.49 18 5.49
2 0.61 - - 25 7.62 25 7.62

DVP 25 7.62 25 7.62 25 7.62

SLP 23 7.01 25 7.62 25 7.62

Installed

Vertically

H

3

Installed

Horizontally

V

H

1

H

2

2

1

Figure 7.5

Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/0824