Heatilator CNXT70E Manual

11-02 1 4000-011 Rev C
INSTALLATION & OPERATING
INSTRUCTIONS
CALIBER NXT DIRECT VENT
CNXT70E/90E
HEATER LISTED
WARNING!
Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this
manual. For assistance or additional information, consult a qualified installer, service agency or the gas supplier.
WARNING!
The fixed glass panel on the front of this heater is extremely hot while it is in operation and for one hour after it has een
shut off. A secondary arrier has een provided to prevent direct contact with the fixed glass panel. Do not operate this
appliance with the arrier removed.
CAUTION:
Do not expose this appliance to the elements (such as rain, etc.).
WARNING: If the information in this manual
is not followed exactl , a fire or explosion ma
result causing propert damage, personal in-
jur or loss of life.
 Do not store or use gasoline or other flammable
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.

4000-011 Rev C 2 11-02
CALIBER NXT INSTALLATION INSTRUCTIONS
TABLE OF CONTENTS
Safety Precautions ...................................................................................................................................... 2
A. Appliance Specifications ............................................................................................................................ 3
Caliber Nomenclature ................................................................................................................................. 4
B. Location and Clearances ............................................................................................................................ 6
C. raming ..................................................................................................................................................... 7
D. Setting the Appliance .................................................................................................................................. 7
E. Conversion from Top Vent to Rear Vent ..................................................................................................... 8
. Venting and Termination ........................................................................................................................... 11
G. Utilities ...................................................................................................................................................... 19
H. inishing ................................................................................................................................................... 23
I. Appliance Preparation ............................................................................................................................. 23
J. Lighting Instructions .................................................................................................................................. 26
K. Seasonal Check List ................................................................................................................................. 27
L. Start-up Issues .......................................................................................................................................... 28
M. Maintenance Instructions.......................................................................................................................... 29
N. Optional Components ............................................................................................................................... 31
O. Replacement Parts ................................................................................................................................... 33
Index ......................................................................................................................................................... 39
Warranty ................................................................................................................................................... 40
WARNING!
Do NOT use this appliance if any part has een under water! You must all a qualified service technician imme-
diately to inspect the appliance and to replace any part of the control system or gas control that has een
under water.
1. Please read these installation instructions completely
before beginning installation procedures. Failure to follow
them could cause an appliance malfunction resulting in
serious injury and/or property damage.
2. Always check your local building codes prior to
installation. This installation must comply with all local,
regional, state and national codes and regulations.
3. Installation and repair should be done by a qualified
service person. This appliance should also be inspected
annually by a qualified service person. More frequent
inspections/cleaning may be required due to excessive
lint from carpeting, bedding materials, etc. It is imperative
that the control compartment, burners and circulating
air passageways of the appliance be kept clean.
4. The Caliber is a vented decorative gas appliance. Do
not burn wood or other material in this appliance.
5. NEVER leave children unattended when there is a fire
burning in the appliance.
6. This appliance may only use the approved venting
systems shown in these installation instructions. Venting
must not be connected to chimney flue servicing a solid
fuel burning appliance or a gas fuel burning appliance.
7. NEVER use gasoline, gasoline-type lantern fuel,
kerosene, charcoal lighter fluid, or similar liquids in this
appliance. Keep any flammable liquids a safe distance
from the appliance.
8. While servicing this appliance, always shut off all
electricity and gas to the appliance. This will prevent
possible electrical shock or burns. Also, make sure the
appliance is completely cooled before servicing.
9. 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.
10. Be sure to provide adequate clearances around the air
openings into the combustion chamber and adequate
accessibility clearances for servicing and proper
operation.
SAFETY PRECAUTIONS

11-02 3 4000-011 Rev C
CALIBER NXT INSTALLATION INSTRUCTIONS
A. APPLIANCE SPECIFICATIONS
Note: Illustrations throughout these instructions reflect
typical installations and are for design purposes only.
Actual installations may vary slightly due to individual
design preferences. However, minimum and maximum
clearances must be maintained at all times.
The illustrations and diagrams used throughout these
installation instructions are not drawn to scale.
3. Efficiency
The efficiency rating of the appliance is a product
thermal efficiency rating determined under continuous
operating conditions and was determined
independently of any installed system.
4. Glass Cer ifica ions/Specifica ions
Heatilator gas appliances manufactured with tempered
glass may be installed in hazardous locations such as
bathtub enclosures as defined by the CPSC. The
tempered glass has been tested and certified to the
requirements of ANSI Z97.1-1984 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 SPCS 16 CFR
Section 1201.5 Certification and labeling requirements
which refers to 15 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.
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.
1. U.S. and Canada Cer ifica ion
The Caliber NXT gas appliance has been tested in
accordance with the ANSI standard Z21.88-2000 in the
United States, the current CSA 2.33-2000, IR41, P4,
and IR66 in Canada, and has been listed by
Underwriters Laboratories Inc. for installation as
described in this manual. All components are UL,
AGA, CGA or CSA safety certified.
2. Local Codes
This installation must conform with local codes. In the
absence of local codes, comply with the National Fuel
Gas Code ANSI Z223.1-latest edition in the U.S., and
the CAN/CGA B149, Installation Codes in Canada.
The Caliber NXT gas appliance has also been tested
and listed for use in manufactured housing (mobile
homes). These installation instructions conform with
the Manu actured Home Construction and Sa ety
Standard, Title 24 CFR, Part 3280, or when such a
standard is not applicable, the Standard or
Manu actured Home Installations, ANSI A225.1.
If you need assistance during installation, contact your
local dealer or the Heatilator Technical Services Dept.,
Hearth Technologies Inc. (HTI), 1915 W. Saunders St.,
Mt. Pleasant, IA 52641, 1-800-843-2848.
HEATILATOR® is a registered trademark of Hearth
Technologies, Inc.
Tools and uilding supplies normally required for
installation:
Saw Framing Material
Pliers Appliance Surround
Hammer Caulking Material
Phillips Screwdriver Gloves
Tape Measure Framing Square
Plumb Line Electric Drill and Bits
Level Wall-finishing
Safety Glasses materials

4000-011 Rev C 4 11-02
CALIBER NXT INSTALLATION INSTRUCTIONS
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CALIBER NOMENCLATURE

11-02 5 4000-011 Rev C
CALIBER NXT INSTALLATION INSTRUCTIONS
Typical Vertical Installations
(Rear and Top Vent Shown)
Typical Horizontal Installations
(Rear and Top Vent Shown)

4000-011 Rev C 6 11-02
CALIBER NXT INSTALLATION INSTRUCTIONS
B. LOCATION AND CLEARANCES
Dimensions
WARNING!
Due to high temperatures, the appliance should e located out of traffic and away
from furniture and draperies.
1. Appliance Loca ions and Space
Requiremen s
Figure 1 illustrates a variety of ways the appliance may
be located in a room. The NXT Series may be installed
directly on the floor or raised on a hearth. These
appliances are certified for installation in a bedroom, bed/
sitting room, or in mobile homes in the U.S. and Canada.
2. Clearances
Figure 2 shows all clearances that must be maintained
around the appliance. See page 11 for termination cap
clearances and pages 12 and 16 for pipe clearances.
Figure 1 - Appliance Locations
Figure 2
Appliance Clearances to Com usti le Materials
CAUTION:
Do not expose the appliance to the elements
(such as rain, etc.).

11-02 7 4000-011 Rev C
CALIBER NXT INSTALLATION INSTRUCTIONS
C. FRAMING
Figure 3 shows typical framing of this appliance using combustible materials. Figure 4 shows the minimum mantel heights. All
required clearances to combustibles must be adhered to.
Figure 3 - Framing
Figure 4 - Mantel Heights
CAUTION:
Wear gloves and safety glasses for protection.
CAUTION:
Provide adequate accessi ility clearances around
the upper and lower grilles for servicing and proper
operation.
WARNING!
Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer
to this manual. For assistance or additional information, consult a qualified installer, service agency or the gas
supplier.
D. SETTING THE APPLIANCE
This appliance may be placed on a smooth, combustible or noncombustible continuous, flat surface. When the appliance
is installed directly on carpeting, tile or other combustible material other than wood flooring, the appliance shall be installed
on a metal or wood panel extending the full width and depth of the appliance. Slide the appliance into position and level
from side-to-side and front-to-back. Shim with noncombustible material as necessary.
Secure the appliance by bending out the nailing flanges on each side of the appliance and nail to the framing. The
nailing flanges have been positioned 5/8 back from the front of the appliance to allow the addition of drywall.
WARNING!
This appliance may use only the approved venting systems shown in these installation instructions. It must
not e connected to a chimney flue servicing a separate solid fuel or gas fuel urning appliance.
WARNING!
To prevent contact with sagging or loose insulation, the appliance must not e installed against vapor arriers
or exposed insulation.

4000-011 Rev C 8 11-02
CALIBER NXT INSTALLATION INSTRUCTIONS
E. CONVERSION FROM TOP VENT TO REAR VENT
1. Remove one screw holding the cover plate (see
Figure5) to the top of the appliance and set aside to
be used in Step 14 if you are converting to rear vent.
3. Remove the cover plate (four screws) from the top pan
heat shield and discard. See Figure 7.
Note: If the appliance is to be top vented, remove and discard the plate (Figure 5) and replace the screw you removed in Step 1.
Figure 5 - Cover Plate, Top of Appliance
2. Remove four screws holding the plate surrounding the
flue. See Figure 6. Remove the plate.
Figure 6 - Remove Plate Screws
Figure 7 - Cover Plate, Top Pan
4. Remove four screws holding the outer collar to the
appliance top. See Figure 8. Remove the outer collar.
Figure 8 - Remove Screws from Outer Collar
5. Remove four screws holding the inner collar to the
appliance top. See Figure 9. Remove the inner collar.
Figure 9 - Remove Screws from Inner Collar
Note: When converting from Top Vent to Rear
Vent, retain all parts removed from the top. They
will be used again, with the exception of the top
pan heat shield removed in Step 3.

11-02 9 4000-011 Rev C
CALIBER NXT INSTALLATION INSTRUCTIONS
6. Remove four screws holding the back cover plate on.
Remove the cover plate. See Figure 10.
Figure 10 - Back Cover Plate
7. Remove four screws holding the outer cover plate to the
appliance back. See Figure 11. Remove the outer cover
and white gasket.
8. Remove four screws holding the inner cover plate to the
appliance back. See Figure 12. Remove the inner cover
and white gasket.
Figure 11 - Remove Outer Cover Plate
Figure 12 - Remove Inner Cover Plate
9. Place the inner collar on the appliance back and replace
the four screws to hold this collar in place. See Figure13.
10. Place the outer collar on the appliance back and replace
the four screws to hold this collar in place. See Figure14.
11. Locate the plate removed in Step 2. Place the plate
around the rear vented collars and replace the four
screws to hold the plate in place. See Figure15.
Figure 13 - Place Inner Collar on Rear of
Appliance
Figure 14 - Place Outer Collar on Rear of
Appliance
Figure 15 - Place Plate on Rear of Appliance

4000-011 Rev C 10 11-02
CALIBER NXT INSTALLATION INSTRUCTIONS
12. Place the inner cover plate and white gasket (removed
in Step 8) on the appliance top and replace the four
screws to hold the inner cover plate in place. See
Figure16.
Figure 16 - Place Inner Cover Plate on Top of
Appliance
13. Place the outer cover plate and white gasket (removed
in Step 7) on the appliance top and replace the four
screws to hold the outer cover plate in place. See
Figure17.
Figure 17 - Place Outer Cover Plate on Top of
Appliance
14. Locate the cover plate removed in Step 1 and place on
top of the top pan heat shield. Replace the four screws
to hold this plate in place. See Figure 18.
Figure 18 - Cover Plate
16. The appliance should look like the one shown in Figure
21 after it has been converted to a rear vent appliance.
Figure 19 - Plate on Top
Figure 21 - Completed Conversion
15. Locate the cover plate removed in Step 6. Place the plate
on top of the appliance. See Figure 19. Replace the four
screws to hold this plate in place. See Figure 20.
Figure 20 - Plate into Place

11-02 11 4000-011 Rev C
CALIBER NXT INSTALLATION INSTRUCTIONS
F. VENTING AND TERMINATION
Figure 22 - Termination Cap Locations
Dimension Descriptions
AClearance above the ground, a veranda, porch, dec or balcony
- 12 inches (30 cm) minimum. *
BClearance to window or door that may be opened  10,000
BTUs or less, 6 inches (15 cm) minimum; 10,000-50,000 BTUs,
9 inches (23 cm) minimum; over 50,000 BTUs, 12 inches (30
cm) minimum. *
CClearance to permanently closed window  12inches (30 cm)
minimum - recommended to prevent condensation on window.
DVertical clearance to ventilated soffit located above the
termination within a horizontal distance of 2 feet (60 cm) from
the centerline of the termination  18inches (46 cm) minimum.
**
EVertical clearance to unventilated soffit - 12 inches (30 cm)
minimum. **
FClearance to outside corner - 6 inches (15 cm) minimum.
GClearance to inside corner - 6 inches (15 cm) minimum.
HNot to be installed above a meter/regulator assembly within 3
feet (90 cm) horizontally* from the center line of the regulator
IClearance to service regulator vent outlet - 6 feet (1.8m)
minimum. *
JClearance to non-mechanical air supply inlet into building or the
combustion air inlet to any other appliance - 12 inches (30 cm)
minimum. *
KClearance to mechanical air supply inlet - 6 feet (1.8 m)
minimum. *
LClearance above a paved sidewal or paved driveway located
on public property - 7 feet (2.1m) minimum.
A vent may not terminate directly above a sidewal or paved
driveway which is located between two single family dwellings
and serves both dwellings.
MClearance under veranda, porch, dec or balcony - 12 inches
(30 cm) minimum. * Recommended 30 inches (76 cm) for vinyl
or plastic.
Only permitted if veranda, porch, dec or balcony is fully open
on a minimum of 2 sides beneath the floor. *
NVertical clearance between two horizontal termination caps 
12 inches (30 cm) minimum.
OHorizontal clearance between two horizontal termination caps 
12 inches (30 cm) minimum.
*As specified in CGA B149 Installation Codes
Note: Local codes or regulations may require different
clearances.
** Clearance required to vinyl soffit material  30inches (76 cm)
minimum. With a vinyl soffit shield  18 inches (46 cm) minimum.
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 Technologies Inc. assumes no responsibility for the
improper performance of the appliance when the venting system
does not meet these requirements.
Measure Clearances

4000-011 Rev C 12 11-02
CALIBER NXT INSTALLATION INSTRUCTIONS
1. Horizon al Termina ion
a. Clearances
See Figures 23 and 24 for clearance information.
. Vent Lengths for Top Vent (see page 13 for
Rear Vent)
Figure 23 - Venting Clearances to
Com usti le Materials (Top Vent)
Figure 24 - Venting Clearances to
Com usti le Materials (Rear Vent)
CAUTION:
Provisions shall e made to provide ad-
equate com ustion and ventilation air.
Figure 25 - Vent Lengths with One El ow
(minimum vertical)
Figure 26 - Vent Lengths with One El ow
(2 vertical or more, 25 maximum)
Various venting configurations are shown in
Figures 25-28 from which maximum vent lengths
can be determined.
Note: Starter elbows cannot be used in any rear
vented configuration.

11-02 13 4000-011 Rev C
CALIBER NXT INSTALLATION INSTRUCTIONS
Figure 27 - Vent Lengths with Two El ows
Figure 28 - Vent Lengths with Three El ows
WARNING!
The horizontal run of vent must have a 1/4
rise for every 1 ft. of run towards the termi-
nation. Never allow the vent to run down-
ward. This could cause high temperatures
and may create a fire hazard.
c. Vent Lengths for Rear Vent
Various venting configurations are shown in
Figures29-32.
2) 45° El ow
For corner installations with horizontal venting,
a maximum of one 45 ° elbow may be used.
The maximum horizontal run following the
elbow is 18 to the base of the cap. See
Figure30.
Figure 29 - No El ows
Figure 30 - 45° El ow
Note: Starter elbows cannot be used in any rear
vented configuration.
1) No El ows
The maximum horizontal run, with no vertical
sections of vent, is 18 inches from the back of
the appliance to the base of the cap. See
Figure29.
Starter el ows cannot e used
in any rear vented configuration.

4000-011 Rev C 14 11-02
CALIBER NXT INSTALLATION INSTRUCTIONS
4) Three El ows
Elbows used on rear-vented configurations
should be either a 90° or a 45° elbow. Starter
el ows CANNOT e used in any rear-
vented configuration. Figure 32 shows
various venting configurations using three
elbows to terminate horizontally.
d. Installing the Interior Wall Shield
Whenever a combustible wall is penetrated, the hole
must be framed (as shown in Figure 33) to receive
an interior wall shield (Figure 34). This shield
maintains minimum clearances and restricts cold air
infiltration.
The termination cap height must meet all local and
national codes and not be easily blocked or
obstructed.
If the wall being penetrated is of noncombustible
materials, a 9 diameter hole is acceptable.
w)nim(vh
1
h+
2
'0'1'5
'0'2'7
'0'3'7
'0'4xam'8
'1'1'3
'1'2'4
'1'3'4
'1'4'6
'2'1'2
'2'2'3
'2'3'3
'2'4'4
Figure 32 - Three El ows
Figure 33 - Exterior Wall Hole
Secure the shield to the framing as shown in
Figure33.
Figure 34 - Interior Wall Shield
3) Two El ows
Elbows used on rear-vented configurations
should be either a 90° or a 45° elbow. Starter
el ows CANNOT e used in any rear-
vented configuration. Figure 31 shows
various venting configurations using two
elbows to terminate horizontally.
Figure 31 - Two El ows
h
1
'1=h
1
'2=h
1
'3=
h
2
h
2
h
2
'1'4'1'2'1'4
'2'6'2'4'2'5
'3''3'6'3'6
'4'11'4'8'4'8
'02
xam
'11
xam
'02
xam
'8
xam
'02
xam
'8
xam
Note: Exterior wall thickness must be a minimum
of 4 to a maximum of 17½.
Top
Vent
Rear
Vent
Starter el ows cannot
e used in any rear
vented configuration.
Starter el ows cannot
e used in any rear
vented configuration.

11-02 15 4000-011 Rev C
CALIBER NXT INSTALLATION INSTRUCTIONS
The last section of vent may require cutting,
depending upon the wall thickness and appliance
location. The cap should overlap the vent sections
by at least 1½. See Figure 35.
e. Installing the Rear Vent Heat Shield
For rear vented appliances a heat shield MUST
be placed 1 inch above the top of the vent between
the wall shield and the termination cap. There are
two sections of the heat shield. One section attaches
to the wall shield with two screws. The remaining
section is attached to the cap in the same manner.
The sections of the heat shield will overlap to match
the wall thickness (depth). The small leg on the
shield should rest on the top of the vent to properly
space it from the pipe section. See Figure 36. This
heat shield is not necessary on top vented
appliances.
Note: If cutting is necessary, you must use
VP12MI and VP24MI pipe.
Figure 35 - Venting Through the Wall
f. Termination
Vent termination must not be recessed in the wall.
Siding may be brought to the edge of the cap base.
Install the cap as shown in Figure 35. Cap pipe
sections should overlap the vent pipe by 1½inches.
Caulk outside edges of cap.
Local codes may require the installation of a cap
shield which prevents anything or anyone from
touching the hot cap.
Figure 22, page 11 illustrates cap locations
prescribed by current Z223.1 and CAN/CGA-B149
Installation Codes.
Figure 36 - Rear Vent Heat Shield
WARNING - RISK OF FIRE!
Be sure there wont e any future o struc-
tions from trees, ushes, snow drifts, etc.
WARNING - RISK OF FIRE!
Always maintain minimum air space clear-
ances or greater around the appliance and
vent system.
CAUTION:
A vinyl soffit shield (VSS2) should e in-
stalled if a cap is within 30 of a vinyl soffit.

4000-011 Rev C 16 11-02
CALIBER NXT INSTALLATION INSTRUCTIONS
2. Ver ical Termina ion
a. Top and Rear Vent Clearances
See Figure 37 for clearance information.
. Top Vent Lengths
Various venting configurations are shown in Figures
38 and 39 from which maximum vent runs can be
determined.
Figure 37
Vertical Termination Clearances
(top vent shown)
Figure 38
Vertical Termination Vent Lengths
Figure 39
Maximum Horizontal Vent Lengths
WARNING!
The horizontal run of vent must have a 1/4 rise for
every 1 ft. of run towards the termination. Never al-
low the vent to run downward. This could cause high
temperatures and may create a fire hazard.
Note: Horizontal runs will require the use of one vent sup-
port (or metal plumber s strap) for every 3 of vent.

11-02 17 4000-011 Rev C
CALIBER NXT INSTALLATION INSTRUCTIONS
c. Rear Vent Lengths
Attach a rear vent kit straight section or an elbow
(depending upon your specific installation) to the
appliance. See Figure 40. Starter el ows
CANNOT e used in any rear vented
configuration. A maximum of three elbows are
allowed in the vent system. Use only pipe listed
with this appliance. ALWAYS MAINTAIN MINIMUM
AIR SPACE CLEARANCES OR GREATER
AROUND THE VENT SYSTEM. Do not pack air
spaces with insulation or other material.
d. Firestop Spacer/Vent Installation
Frame an opening and install a firestop spacer
whenever the vent penetrates a ceiling/floor area,
as shown in Figure 41. Frame the opening with the
same sized lumber as used in the ceiling/floor joists.
Unless the flue is offset, the hole should be directly
above the appliance. DO NOT pack insulation
around the vent.
Figure 41
Installing the Firestop Spacer
Figure 40
Rear Vent Length Allowances for
Vertical Termination Only
CAUTION:
Provisions shall e made to provide adequate com-
ustion and ventilation air.
WARNING - RISK OF FIRE!
Always maintain minimum clearances or greater
around the vent system. Do not pack air spaces with
insulation or other material.
Starter el ows cannot e used in any rear
vented configuration.

4000-011 Rev C 18 11-02
CALIBER NXT INSTALLATION INSTRUCTIONS
e. Chase/Termination Installation
Figures 42 and 43 and Table 1 specify minimum
vent heights for various pitched roofs.
These vent heights are necessary for safety and do
not ensure draft-free operation. Trees, buildings,
adjoining roof lines, adverse conditions, etc. may
create a need for a taller vent should down drafting
occur.
Figure 42 - Vent Height for Vertical Termination
Roof Pitch H (Min.) Ft.
Flat to 6/12 ................................................ 1.0
6/12 to 7/12 ............................................... 1.25
Over 7/12 to 8/12 ...................................... 1.5
Over 8/12 to 9/12 ...................................... 2.0
Over 9/12 to 10/12 .................................... 2.5
Over 10/12 to 11/12 .................................. 3.25
Over 11/12 to 12/12 .................................. 4.0
Over 12/12 to 14/12 .................................. 5.0
Over 14/12 to 16/12 .................................. 6.0
Over 16/12 to 18/12 .................................. 7.0
Over 18/12 to 20/12 .................................. 7.5
Over 20/12 to 21/12 .................................. 8.0
Ta le 1 - Vent Height
3. Assembling he Ven Sec ions
a. Attaching the Venting to the Appliance
To attach the first VP section to the appliance collars,
simply slide the flared end of the inner vent of the
VP section over the inner collar on the appliance.
At the same time, insert the outer vent into the outer
collar on the appliance. Push the vent section into
the appliance collar until all the lances have snapped
in place. Tug slightly on the vent to confirm it has
completely locked into place.
. Assem ling Vent Sections
1) Start the flared inner flue of section A over
the inner flue of section B.
2) Insert the outer flue of section A into the outer
flue of section B. See Figure 44. Once both inner
and outer flues are started, press section A into
section B firmly until all lances have snapped
into place. Tug slightly on section A to confirm it
has completely locked into place. See Figure 45.
Note: Squeezing the pipe slightly to fit may be nec-
essary.
Make sure that the seams are not aligned to prevent
unintentional disconnection.
To ensure proper operation, verify all venting and the
termination are unobstructed.
Figure 44 Figure 45
Figure 43 - Multiple Vertical Terminations

11-02 19 4000-011 Rev C
CALIBER NXT INSTALLATION INSTRUCTIONS
1. High Al i ude Ins alla ion
For U.S. installation, appliances are tested and approved for elevations from 0-2000 feet. When installing this appliance
at an elevation above 2000 feet, National Fuel Gas Codes require a decrease of the input rating by changing the existing
burner orifice to a smaller size. Input should be reduced 4% for each 1000 feet above sea level. Check with the local gas
utility for proper orifice size identification. The correct orifice is available from your Heatilator distributor.
For Canada, appliances are certified for elevations from 0-4500 feet. When installing this appliance at an elevation
between 0-4500 feet in Canada, the input rating does not need to be reduced. When installing this appliance at an
elevation above 4500 feet in Canada, check with local authorities.
G. UTILITIES
c. Assem ling Minimum Installations (MI)
Sections
MI sections are non-unitized so that they can be
cut to a certain length. To use these sections, they
must be cut to length from the non-expanded end.
See Figure 46. They can then be attached by first
connecting the expanded end of the MI inner vent
with the inner vent from the adjacent vent section
and securing with three screws. The expanded
portion of the MI inner vent must overlap completely
with the untreated end of the adjacent vent section.
The outer vent can then be inserted into the
adjacent outer vent expanded end and attached to
the next vent section with three screws. The other
end of the MI vent section can then be attached by
fitting a snap lock section to it and snapping it
together as normal.
d. Assem ling Slip Sections
Slip sections should be snapped into the first mating
piece, then expanded to their desired length, making
sure that a 1.5 overlap is maintained between the
two sections of the slip section. The two sections of
the slip section then need to be secured by driving
two screws through the overlapping portions of the
outer vent. See Figure 47. This will secure the slip
section to the desired length and prevent it from
separating. The slip section can then be attached
to the next section of vent.
e. Disassem ling Vent Sections (only if
necessary)
To disassemble any two pieces of pipe, rotate one
section so that the seams on both pipe sections
are aligned as shown in Figure 48. They can then
be carefully pulled apart.
Figure 47
Figure 48
Figure 46

4000-011 Rev C 20 11-02
CALIBER NXT INSTALLATION INSTRUCTIONS
Figure 49
Flex Connector & Manual Shutoff Valve
Figure 50 - Gas Line
Note: This appliance and its individual shutoff valve
must be disconnected from the gas supply piping
system during any pressure testing of that system at
test pressures in excess of 1/2 psi (3.5 kPa). The
appliance must be isolated from the gas supply piping
system by closing its individual manual shutoff valve
during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 psi
(3.5 kPa).
2. Gas Line Connec ion
The appliance is provided with a stainless steel flexible
connector and a listed (and Commonwealth of
Massachusetts approved) tee-handle manual shutoff
valve. See Figure 49. The incoming gas line should be
piped into the valve compartment and connected to
the 1/2 FIP connection provided on the manual shutoff
valve. See Figure 50 to connect the gas line. Optional:
Seal around gas line to prevent cold air leakage.
All connections must be tightened and checked for
leaks with a soap and water solution or a leak detector.
Bleed the gas line to extract any air that may have
been trapped inside the pipe.
3. Gas Pressure
A pressure tap is included on the front face of the
intermittent pilot ignition gas control valve.
Table 2 shows optimum gas pressure information.
Consult your local gas company for assistance in
determining the proper orifice for your altitude or refer
to ANSI Z223.1-latest edition, Appendix F.
Table 3 shows orifice sizes and BTU ratings.
4. Field Fuel Conversion
Natural or propane gas conversions necessary to meet
the application need to be made by a qualified technician
using Hearth Technologies Inc. specified and approved
parts.
In the event your appliance must be converted to use
propane, you must use a DCKVPNXT Conversion Kit.
To be converted to use natural gas, you must use a
DCKVNNXT Conversion Kit.
Note: Have the gas supply line installed in
accordance with building codes 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.