NCP Comfort Pack CP9 T Series User manual

HEATING & A/C EQUIPMENT
NATIONAL
COMFORT
PRODUCTS
®
Thru-the-Wall Comfort for all types of Multi-Family Construction
National Comfort Products
A Division of National Refrigeration and Air Conditioning Products, Inc.
539 Dunksferry Road • Bensalem, PA 19020-5908
[phone]
www.nationalcomfortproducts.com
HEATING & A/C EQUIPMENT
NATIONAL
COMFORT
PRODUCTS
®
Go Thru-the-Wa
CP9
T-Series
Please ll in the following information and le it for
future reference.
MODEL NO.______________________________
SERIAL NO.______________________________
INSTALL DATE ___________________________
This unit should be installed in an
Outside Wall For
Thru-The-Wall
Installation Only!
Installation Guide
Comfort Pack Gas
T-Series
Read Installation Manual
Prior To Starting The Installation.
This manual must be left with the homeowner
for future reference.
Condensing Furnace
up to 95% AFUE
COMFORT PACK

2

Installation Guide |Comfort Pack T Series with up to 95% Gas Heat
3
Comfort Pack Nomenclature ....................................................................... page 4
Safety Warnings.......................................................................................... page 5-6
Before You Start ......................................................................................... page 6
Installation .................................................................................................. page 8
Drainage...................................................................................................... page 8-10
Clearance ................................................................................................... page 11
Unit Location Considerations ..................................................................... page 11
Vent Termination Clearances ..................................................................... page 12
Electrical ..................................................................................................... page 13-15
Dimensions ................................................................................................ page 16
Gas Furnace Specifications ......................................................................... page 17
Sequence of Operations (Gas Heat) ............................................................ page 17
Abnormal Functions ................................................................................... page 18
High Altitude Operation .............................................................................. page 18-20
Gas Piping, Venting & Pressures ............................................................... page 20-22
Ignition System........................................................................................... page 22-23
Start up....................................................................................................... page 23-24
Special Notes for Extremely Cold Weather Areas........................................ page 24-25
Gas Control Valve........................................................................................ page 25
Maintenance and Service ............................................................................ page 25-29
Slide Out Furnace Instructions.................................................................... page 30-32
Equipment Specifications............................................................................ page 33
Air Flow ...................................................................................................... page 34-35
Wiring Diagram .......................................................................................... page 36
Troubleshooting ......................................................................................... page 37-38
Replacement Parts Guide ........................................................................... page 39-40
Warranty .................................................................................................... page 42-43
IMPORTANT NOTE: DO NOT DESTROY OR DISCARD THIS MANUAL.
IT SHOULD BE KEPT IN A SAFE PLACE FOR FUTURE REFERENCE.
Table of Contents

Installation Guide |Comfort Pack T Series with up to 95% Gas Heat
4
Comfort Pack Nomenclature
CP
Product
CP = Comfort Pack
9
Heat Type
8 = 80% Gas
9 = 95% Gas
E = Electric
4
Refrigerant
4 = R410A
30
Clg. Capacity
30 = 2.5 Ton
43
Htg. Capacity
43 = 43 MBH
50 = 50 MBH
T
Series
T= Tall
A
Option
A = Standard
B = Slotted Door
C = w/o Rear Grille
D = Both B&C
1 1B
Generation
-
Factory Use

Installation Guide |Comfort Pack T Series with up to 95% Gas Heat
5
Safety Warnings!
This appliance is not intended for use by those (including
children) with reduced physical, sensory or mental capabilities,
or lack of experience and knowledge, unless they have been given
supervision or instructions concerning use of the appliance by a
person responsible for their safety. Children should be supervised
to ensure that they do not play with the appliance.
This appliance is intended to be installed up to 10,000 ft (3,000
m) above sea level. If the appliance is being installed at more than
2000 ft (610 m) above sea level, furnace modifications are needed
which can be found under High Altitude Operation section of this
manual.
This appliance only uses R410A refrigerant.
1. DANGER: FAILURE TO COMPLY WITH WILL RESULT
IN SEVERE PERSONAL INJURY OR DEATH AND/ OR
PROPERTY DAMAGE.
2. WARNING: FAILURE TO COMPLY COULD RESULT
IN SEVERE PERSONAL INJURY OR DEATH AND/ OR
PROPERTY DAMAGE.
3. CAUTION: FAILURE TO COMPLY COULD RESULT
IN MINOR PERSONAL INJURY AND/OR PROPERTY
DAMAGE.
!HAZARD INTENSITY LEVELS
SHOULD OVERHEATING OCCUR, OR THE GAS SUPPLY
FAIL TO SHUT OFF, SHUT OFF THE MANUAL GAS VALVE
TO THE APPLIANCE BEFORE SHUTTING OFF THE
ELECTRICAL SUPPLY.
FOR YOUR SAFETY, DO NOT STORE OR USE GASOLINE
OR OTHER FLAMMABLE VAPORS AND LIQUIDS IN THE
VICINITY OF THIS OR ANY OTHER APPLIANCE. SUCH
ACTIONS COULD RESULT IN PROPERTY DAMAGE,
PERSONAL INJURY, OR DEATH.
!WARNING
WARNING: DO NOT USE THIS APPLIANCE IF ANY PART
HAS BEEN UNDER WATER. IMMEDIATELY CALL A
QUALIFIED SERVICE TECHNICIAN TO INSPECT THE
APPLIANCE AND REPLACE ANY GAS CONTROL THAT
HAS BEEN UNDER WATER.
!WARNING
!CAUTION
INSTALLATION AND REPAIR OF THIS UNIT SHOULD
BE PERFORMED ONLY BY INDIVIDUALS MEETING THE
REQUIREMENTS OF AN “ENTRY LEVEL TECHNICIAN”
AS SPECIFIED BY NATIONAL CODES. ATTEMPTING
TO INSTALL OR REPAIR THIS UNIT WITHOUT SUCH
BACKGROUND MAY RESULT IN PRODUCT DAMAGE,
PERSONAL INJURY OR DEATH.
!WARNING
“USE COPPER SUPPLY WIRES ONLY”
HIGH VOLTAGE!
DISCONNECT ALL POWER BEFORE SERVING.
FAILURE TO DO SO MAY RESULT IN PROPERTY
DAMAGE, PERSONAL INJURY OR DEATH.
!WARNING
USE CARE WHEN HANDLING COMPRESSORS. SOME
TEMPERATURES COULD BE HOT!
THE UNIT MUST BE PERMANENTLY GROUNDED.
FAILURE TO DO SO CAN CAUSE ELECTRICAL SHOCK
RESULTING IN SEVERE PERSONAL INJURY OR DEATH.
COMPRESSORS SHOULD NEVER BE USED TO
EVACUATE THE AIR CONDITIONING SYSTEM. VACUUMS
THIS LOW CAN CAUSE INTERNAL ELECTRICAL ARCING
RESULTING IN A DAMAGED OR FAILED COMPRESSOR.
!WARNING
!CAUTION
!CAUTION
!WARNING
IMPROPER INSTALLATION, ADJUSTMENT, ALTERATION,
SERVICE, OR MAINTENANCE CAN CAUSE PROPERTY
DAMAGE, PERSONAL INJURY OR LOSS OF LIFE. REFER
TO THE USER’S INFORMATION MANUAL PROVIDED
WITH THIS FURNACE. INSTALLATION AND MATERIALS,
SERVICE MUST BE PERFORMED BY A QUALIFIED
INSTALLER, SERVICE AGENCY OR THE GAS SUPPLIER.
This furnace must be installed in accordance with the
manufacturer’s instructions and local codes. In the absence of
local codes, follow the National Fuel Gas Code, ANSI Z223.1 or
the CAN/CGA-B149 Installation Codes.
To be installed without alteration.

Installation Guide |Comfort Pack T Series with up to 95% Gas Heat
6
IF THE INFORMATION IN THIS MANUAL
IS NOT FOLLOWED EXACTLY, A FIRE
OR EXPLOSION MAY RESULT CAUSING
PROPERTY DAMAGE, PERSONAL INJURY
OR LOSS OF LIFE.
Do NOT store or use gasoline or other ammable
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 re
department.
Installation and service must be performed by a
qualied installer, service agency or the gas supplier.
!WARNING
IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE
FURNACE MUST BE REPLACED, IT MUST BE REPLACED
WITH WIRING MATERIAL HAVING A TEMPERATURE
RATING OF AT LEAST 90 ° C.
THIS FURNACE MUST BE INSTALLED SO THERE ARE
PROVISIONS FOR VENTILATING AIR.
SHOULD OVERHEATING OCCUR, OR THE GAS SUPPLY
FAIL TO SHUT OFF, SHUT OFF THE MANUAL GAS
VALVE TO THE FURNACE BEFORE SHUTTING OFF THE
ELECTRICAL SUPPLY.
!WARNING
THESE UNITS ARE NOT APPROVED FOR MOBILE
HOME APPLICATIONS. SUCH USE COULD RESULT IN
PROPERTY DAMAGE, PERSONAL INJURY, OR DEATH.
!CAUTION
THESE INSTRUCTIONS ARE INTENDED AS AN AID TO
QUALIFIED, LICENSED SERVICE PERSONNEL FOR
PROPER INSTALLATION, ADJUSTMENT AND OPERATION
OFTHISUNIT.READTHESEINSTRUCTIONSTHOROUGHLY
BEFORE ATTEMPTING INSTALLATION OR OPERATION.
FAILURE TO FOLLOW THESE INSTRUCTIONS MAY
RESULT IN IMPROPER INSTALLATION, ADJUSTMENT,
SERVICE OR MAINTENANCE POSSIBLY RESULTING
IN FIRE, ELECTRICAL SHOCK, PROPERTY DAMAGE,
PERSONAL INJURY OR DEATH.
!WARNING
DO NOT USE OXYGEN TO PURGE LINES OR PRESSURIZE
SYSTEM FOR LEAK TEST. OXYGEN REACTS VIOLENTLY
WITH OIL, WHICH CAN CAUSE AN EXPLOSION
RESULTING IN SEVERE PERSONAL INJURY OR DEATH.
GAS-FIRED APPLIANCES ARE NOT DESIGNED FOR
USE IN HAZARDOUS ATMOSPHERES CONTAINING
FLAMMABLE VAPORS OR COMBUSTIBLE DUST,
IN ATMOSPHERES CONTAINING CHLORINATED
OR HALOGENATED HYDROCARBONS, OR IN
APPLICATIONS WITH AIRBORNE SILICONE
SUBSTANCES. SEE HAZARD LEVELS BELOW.
!WARNING
!WARNING
Before You Start
This unit is shipped with a cooling chassis installed in the cabinet.
Prior to installing the unit in the wall opening, the shipping bolts
located at the bottom on both sides of the cabinet must be
removed to allow for removal of the cooling chassis. 1/4"hole
plugs provided with the unit should be installed in the holes to
prevent air leakage. Shipping bolts are located on both sides below
this sticker:
THE SHIPPING BOLTS MUST BE REMOVED PRIOR
TO INSTALLATION OF THE CABINET TO PERMIT
REMOVAL OF THE CHASSIS. INSTALL THE HOLE
PLUGS PROVIDED.
14299588
This unit is designed and approved for through-the-wall
installation only. The unit must be installed a minimum of 8"
above finish floor. If this unit is installed in a residential garage,
it must be installed so that the ignition source and burners are
located not less than 18 inches (457 mm) above the floor, and
it must be located or protected to avoid physical damage by
vehicles. The entire unit must not be installed outside. The grille
side of the unit should extend 3/4" beyond the exterior wall to allow
moisture that may enter the outdoor section to drain. The pitch
of the internal drain pans toward the outside will assure proper
drainage when the cabinet is installed level. Masonry walls must
have a lintel to support the wall.
The interior of the unit may be installed with zero clearances to
adjacent combustible surfaces. The unit shall not be installed
directly on carpeting, tile or other combustible material, except
wood flooring. In order to be able to remove the chassis, 40" of
open area must be left unobstructed in front of the access panels.
The 3/4" O.D. drain pan connection should be connected to the
building drain using the flexible tubing included and a trap. The

Installation Guide |Comfort Pack T Series with up to 95% Gas Heat
7
secondary drain offers protection from overflow. The secondary
drain feature is piped into the base of the unit and drains through
the weep holes outside. Reconnect 3” piece of clear flexible tubing
to secondary drain on drain pan. Position secondary drain through
grommet of chassis and connect to flexible tubing (prime trap
prior to operating).
Local codes should be followed to route the furnace condensate
to the proper drainage. The furnace condensate drain kit provides
materials for two different drain locations described later in this
manual (page 9-10). Ensure that the condensate is able to freely
drain through the lines with minimal condensate buildup to prevent
line freezing during low ambient conditions
The grille side must be kept free of any obstructions that will
reduce or alter the air flow pattern. The unit must be installed
at least 4 feet (1.22 m) from electric meters, gas meters,
regulators, and relief equipment. The vent of the unit is located
at the front grille. Distances from adjacent public walkways,
adjacent buildings, openable windows, and building openings
must be consistent with the National Fuel Gas Code ANSI Z223.1
and/or CAN/CGA-B149 installation codes, as well as local codes.
If an optional architectural grille is to be used on standard units,
the stamped grille provided must be removed. Consult the factory
prior to ordering product(s) that require an optional architectural
grille.
THE INSTALLATION OF THIS APPLIANCE MUST
CONFORM TO THE REQUIREMENTS OF THE
NATIONAL FIRE PROTECTION ASSOCIATION;
THE NATIONAL ELECTRIC CODE, ANSI/NFPA
NO. 70 (LATEST EDITION) IN THE UNITED
STATES; THE CANADIAN ELECTRICAL CODE
PART 1, CSA 22.1 (LATEST EDITION) IN
CANADA; AND ANY STATE OR PROVINCIAL
LAWS OR LOCAL ORDINANCES. LOCAL
AUTHORITIES HAVING JURISDICTION SHOULD
BE CONSULTED BEFORE INSTALLATION IS
MADE. SUCH APPLICABLE REGULATIONS
OR REQUIREMENTS TAKE PRECEDENCE
OVER THE GENERAL INSTRUCTIONS IN THE
MANUAL.
!CAUTION
To remove the chassis from the cabinet:
Turn off power to the unit. Remove the two lower access panels from the
cabinet. Disconnect the drain line from the evaporator coil drain connection.
Disconnect the secondary drain flexible tubing & trap to avoid damage
(prime trap when reinstalling). Depress and hold the release latch on the
chassis power wiring connector and unplug it from the cabinet power wiring
connector. Depress and hold the release latch on the control wiring connector
and unplug it from the cabinet control wiring connector.
Unfasten the screws attaching the chassis to the unit located above the
control deck. Temporarily secure the chassis power and control wiring and
connectors to the top of the indoor coil cover to prevent damage during
chassis removal.
Carefully slide the chassis out of the cabinet by grasping the handles located
beneath the evaporator coil drain pan and pulling toward you while keeping
the chassis centered in the cabinet. As the chassis is removed, keep the
chassis level until the outdoor fan cover passes the cabinet seals. Damage to
the cabinet seals will result if the chassis is not kept level until the outdoor
fan cover has passed the cabinet seals. After the chassis is removed, it
should be handled using the chassis base and evaporator drain pan, not by
using refrigerant piping or the outdoor fan mount. The bottom of the chassis
is not smooth and will damage floors if slid.
To install the chassis into the cabinet:
Turn off power to the unit. Temporarily secure the chassis power and control
wiring and turn Off power to the unit. Temporarily secure the chassis power
and control wiring and connectors to the top of the indoor coil cover to
prevent damage during chassis installation. Place the outdoor coil section
of the chassis onto the cabinet rails. Lift the rear of the chassis using the
handles located beneath the evaporator coil drain pan so that the chassis
is level and centered as it is pushed in the cabinet. Damage to the cabinet
seals will result if the chassis is not kept level until the outdoor fan cover
has passed the cabinet seals, and if the chassis is not kept centered in the
cabinet. After the chassis is all the way in the cabinet, check that the chassis
Is centered in the cabinet by verifying that it is in contact with the cabinet
seals on both sides.
Fasten the screws above the control deck to secure the chassis to the cabinet.
Install the chassis power wire connector and the control wiring connector
into their respective cabinet wiring connectors so that the connectors latch.
Connect the drain line to the evaporator coil drain connection. Reconnect
3” piece of clear flexible tubing to secondary drain on drain pan. Position
secondary drain through grommet of chassis and connect to flexible tubing
(prime trap prior to operating). Install the lower access panels on the cabinet.
Turn on power to the unit.
ALL phases of this installation must comply with NATIONAL,
STATE AND LOCAL CODES. The manufacturer assumes no
responsibility for equipment installed in violation of any code
requirements.
Be sure that the electrical data specied on the unit rating plate
corresponds to what is available at the installation site and NEC
for installation requirements.
This unit MUST be installed in an outside wall for thru-the-wall
installation ONLY.
Be sure that the electrical service provided to the building can
handle the load imposed by the unit.
IMPORTANT — This Document is customer property and is to
remain with this unit. Please refer to service information pack
upon completion of work to register the unit’s warranty. These
instructions do not cover all variations in systems or provide
for every possible contingency to be met in connection with the

Installation Guide |Comfort Pack T Series with up to 95% Gas Heat
8
installation. Should further information be desired or should
particular problems arise which are not covered sufciently
for the purchaser’s purposes, the matter should be referred to
your installing dealer or local distributor before contacting the
manufacture.
NOTE: THE UNIT MUST NEVER BE PLACED ON ITS
SIDE OR UPSIDE DOWN AS THE COMPRESSOR
OIL WILL RUN IN THE COOLING CIRCUIT AND
SERIOUSLY DAMAGE THE UNIT.
Installation
NOTE: INSTALLATION AND MAINTENANCE
INSTRUCTIONS SHOULD BE LEFT WITH THE UNIT
FOR FUTURE REFERENCE.
This unit must be installed in accordance with all applicable codes.
This unit is not to be used for temporary heating of buildings or
structures under construction.
FOR MAXIMUM PERFORMANCE, IT IS IMPERATIVE THAT
THE COOLING CHASSIS AIR DIVIDER BE SEALED TO THE
CABINET AIR SEAL. ANY LEAKAGE WILL ALLOW OUTSIDE
UNCONDITIONED AIR TO INFILTRATE AND MIX WITH
THE CONDITIONED AIR. THIS CONDITION WILL DEGRADE
UNIT PERFORMANCE. ALL UNITS SHOULD BE INSPECTED
FOR THIS CONDITION, AS DURING TRANSPORTATION AND
INSTALLATION THE SEALS CAN BE DISTURBED. IF REQUIRED,
A LIGHT BEAD OF CAULKING IS RECOMMENDED TO SEAL
THE CHASSIS TO THE AIR SEAL TO ELIMINATE LEAKAGE.
Outside unconditioned air must not be introduced into the return
air stream of this unit if the mixed air temperature falls below
55°F in heating mode at design conditions. This condition
may also degrade the performance of the unit and improper
applications could void equipment warranty.
The unit must be installed through an exterior wall with the back
end extending 3/4” past the outside wall surface. Provide support
inside the building for the unit near the return air opening. There
should be enough clearance around the supports to route return
ductwork to the unit or allow for unrestricted airflow in an open
return configuration. To reduce the possible transmission of sound
and vibration, a resilient material such as rubber or cork should be
installed between the support and the base of the unit. All spaces
around the top, sides, and bottom of the exterior grille area should
be caulked and sealed to the wall, making sure that the openings
for drainage in the bottom edge are not blocked.
If the optional wall sleeve is used, caulk the spaces between the
sleeve and the wall. Completely fill the clearance on all sides
between the unit and the wall sleeve with a polyurethane foam
sealant (follow manufacturer’s suggested application manual).
Attach the provided bracket to the wall sleeve
NOTE: FOR EASE OF INSTALLATION, INSTALL
THE CABINET INTO THE WALL SLEEVE FIRST
WITHOUT THE COOLING CHASSIS. THEN SLIDE
COOLING CHASSIS IN AFTER CABINET IS IN
PLACE.
Slide the unit into the wall sleeve and fasten the unit to the
sleeve with the five screws provided with the sleeve.
↓↓ ↓ ↓ ↓
Evaporator Drainage
The 3/4" I.D. flexible tubing included should be connected to the
Comfort Pack primary drain connection so that it can easily be
disconnected if the cooling chassis must be removed. A trap
at least 2" deep should be provided close to the drain pan. The
tubing should not be higher than the bottom of the unit drain
pan at any point to assure proper drainage and allow chassis
removal. The drain line should pitch downward at least 1" per
10 ft. to an open building drain trap.

Installation Guide |Comfort Pack T Series with up to 95% Gas Heat
9
SECONDARY DRAIN TRAP
MUST BE INSTALLED
Drain Pan
3/4” I.D. Flexible Tubing Included 2”
min. Pitch Downward 1” per 10ft.
Shaded Area Represents Components
Provided and Installed By Others
Highest Point Must Not Be Above
Bottom of Drain Pan
3/4” O.D. Drain Connection
(Primary Drain)
Secondary Evaporator Drain Trap
Install Instructions:
1. The trap and 2"piece of clear flexible 1/2"ID tubing are
shipped loose to prevent damage. They should be installed after
the Comfort Pack unit is installed and the return air connection
completed.
2. The trap must be primed (filled with water) for proper operation
of the secondary drain system. This may be done prior to
installation of the trap or after.
3. Insert trap into the grommet located in chassis base pan.
a. Apply force to section 1 (refer to drawing below)
b. Ensure at least .5"- 0.75"of tubing is inserted into the
grommet
c. PVC should be flush with drain pan connection
Secondary Drain Connection
Drain Pan
Apply
Force
1/2” I.D. Tubing
Grommet
Trap
Chassis Base
1
4. Position the trap as shown and slide the 2"piece of clear flexible
tubing about 1"onto the top end of the trap. Slide the top of the
flexible tube on the trap onto the bottom of the 1/2"OD secondary
drain connection and push the top of the trap up. The trap should
be positioned so that there is only a small gap between the top of
the trap and the bottom of the secondary drain connection.
5. To avoid damage whenever the slide-out chassis has to be
removed from the cabinet, remove the secondary drain trap before
sliding the chassis out. After the chassis is reinstalled in the
cabinet, prime the trap with water before reinstalling it.
NOTE: THE HIGH EFFICIENCY FURNACES
PRODUCE CONDENSATE DURING OPERATION.
IN UNCONDITIONED SPACES, THE CONDENSATE
MAY BE SUSCEPTIBLE TO FREEZING. ENSURE
THE CONDENSATE IS ABLE TO DRAIN FREELY
AND PROPER CARE IS TAKEN TO PREVENT
DRAIN LINE FREEZING.
Furnace Condensate Drainage
A Condensate Drain Kit is provided with the unit. It contains a
waterless trap, two routing clamps, barbed hose elbow, barbed
hose coupling, two sheet metal screws, and two pieces of 5/8"
vinyl tubing. The unit has two options for the location of the
waterless trap.
Instructions for Primary Location:
• Remove top right access panel to reveal burner compartment.
• Replace plastic insert located on side panel with rubber
grommet provided within the condensate drain kit.
• Locate the free end of the provided hose along the bottom of
the burner compartment.
• Connect the supplied barbed hose elbow to the hose from the
burner compartment.
• Cut approximately 1" off the long side of the vinyl tubing elbow.
(Verify length of the tubing needed to properly locate waterless
trap before cutting)
• Insert the short side of the vinyl tubing elbow into the grommet
on the side panel and connect to the barbed hose elbow.
• Install one of the supplied routing clamps over the connection
between the vinyl and barbed elbows and secure to the air
divider with a sheet metal screw (Note: there is a bite hole in
the divider under the insulation)
• Connect waterless trap to free end of vinyl tubing elbow.

Installation Guide |Comfort Pack T Series with up to 95% Gas Heat
10
• Use the second routing clamp and sheet metal screw to secure
waterless trap to side panel.
• Reinstall burner compartment access panel.
• Follow all applicable codes to route condensate from waterless
trap to on-site drainage.
Vinyl Tubing
Routing Clamp
Waterless Trap
5/8"I. D. Field
Conn Size
Drain Line
Barbed Elbow
Routing Clamp
Instructions for Secondary Location:
• Remove burner compartment access panel, filler plate, and
filter door.
• Locate the free end of the provided hose along the bottom
of the burner compartment.
• Connect the supplied barbed hose elbow to the hose from
the burner compartment.
• Insert free end of barbed hose elbow through the hole
provided in the horizontal air divider.
• Cut the supplied vinyl tubing elbow into a straight tube
approximately 5” long. (Verify length of the tubing needed
to properly locate waterless trap before cutting)
• Install the vinyl tubing to the free end of the barbed hose
elbow.
• Connect the waterless trap to free end of the vinyl tubing.
• Use provided routing clamp and sheet metal screw to
secure waterless trap to side panel.
• Follow all applicable codes to route condensate from
waterless trap to on-site drainage.
• Reinstall access panel, filler plate, and filter door.
• Follow all applicable codes to route condensate from
waterless trap to on-site drainage.
Barbed Elbow
5"Vinyl Tubing
Drain Line
Waterless Trap
5/8"I. D. Field Conn Size
Routing Clamp
External Draining
The condensing furnace external drainage is critical to the furnaces
continued operation. Regardless of the desired drainage option
selected above, all tubing must be secured with the routing clamps
using the predrilled mounting holes. Downstream of the waterless
trap will be a field connected 5/8” vinyl tube that must be directed
into an air break before any other drainage is tied into the unit. This
includes the condensate drain for the cooling section.
Clear tubing to fit into field
installed drain line.
There must be an air gap
surrounding the clear
tubing
*The furnace drain must be in a conditioned space and in some
cases additional means for heating the drain line (such as heat
tape) will be necessary to avoid freezing.

Installation Guide |Comfort Pack T Series with up to 95% Gas Heat
11
Clearances
For proper unit performance and maximum operating life please
maintain the following minimum installation clearances.
Unit Location Considerations
In thru-the-wall installation, due to the various types of wall
construction, it is not possible to provide detailed instructions.
The following is a list of general requirements and cautions for
installing these units.
The unit must be installed level, both - top front to back and left
to right.
1. Masonry walls must have a lintel to support the wall.
2. Extend the unit approximately 3/4" beyond the outside surface
of the wall. Optional mounting angles can be purchased from the
factory or field fabricated for locating and mounting the unit in the
wall.
3. The wall opening across the top and bottom must be flashed.
a. During periods of rain and wind the primary drainage path may
not be adequate to handle the load. Secondary precautions
may also be required but not limited to the following:
- Seal flashing to unit
- Floor drain
- Additional field sealing of sheet metal joints
- Sealing of unused access opening
4. Clearances to air inlets and outlets must be adequate to ensure
no air flow obstructions or recirculation of condenser air flow.
5. Some architectural designs of buildings will require the unit to
be mounted behind a decorative grille. The performance (capacity
and efficiency) of the unit may be reduced with the use of these
decorative grilles. The less resistive these grilles are to air flow, the
better the unit's performance will be. Outdoor louvers provided by
others must be approved by NCP to maintain unit performance and
warranty. Care must be taken to locate the condenser coil away
from loose debris that may clog intake.
6. If the unit is mounted behind a decorative grille, one or both of
the following items must be done to eliminate recirculation of air
to the unit:
a. The front of the unit must be mounted tight to the inside of the
architectural grille
b. A barrier must be provided to prevent recirculation of air to
the unit (mixing of inlet and outlet air) when the front of the
unit is mounted back from the inside of the architectural grille
7. The unit must not be mounted in dead-end hallways or areas
where there is no fresh outside air circulation. Cool fresh outside
air must be provided for best unit operation. Thru-the-wall units
may not be located where hot exhausts from clothes dryer vents,
kitchen vents, steam vents or corrosive fumes could come in
contact with coil side of unit.
8. 40" clearance is required for service accessibility on the inside
service panel.
9. If more than one unit is to be installed in the same area a
minimum of 60" vertical spacing must be maintained between units
to minimize recirculation of condenser exhaust air.
10. Care must be taken when locating the unit. Locate away from
bedrooms as operational sounds may be objectionable.
*For other clearance information see pages 12 and 20.
Minimum 12"
Horizontal Clearance
Between Units
*Less than 12" Call National Comfort Products
Minimum 60"
Vertical Clearance
Between Units
Comfort Pack units must be installed through an outside wall.
Confined spaces and/or covered areas should be avoided. Consult
the factory if unclear of clearances required. Units must be installed
a minimum of 12" apart when two units are side by side. If three or
more units are to operate next to one another, allow a minimum of
60" between units or pairs of units. Also, a vertical clearance of 60"
should be maintained between units. Units installed on the bottom
floor should be mounted at least 8" off of the ground.
The unit is designed and approved for thru the wall installation only.
The unit must be installed a minimum of 8" above a finished floor.
If the unit is installed in a residential garage, it must be installed
so that the ignition source and burners are located not less than
18" above the floor, and it must be located or protected to avoid
physical damage by vehicles.

Installation Guide |Comfort Pack T Series with up to 95% Gas Heat
12
Vent Termination Clearances for Direct Vented Installations in the USA
For other gas venting information see page 21.
Operable
VENT TERMINAL AIR SUPPLY INLET AREA WHERE TERMINAL
IS NOT PERMITTED
B
Fixed
Closed
c
B
N
F
B
P
DE
J
B
B
B
L
A
Operable
Fixed
Closed
H
o
M
Inside Corner
Detail
G
A
Balcony -
with perpendicular side wall
Combustible &
Noncombustible
X = 24” (610 mm)
Z = 20” (508 mm)
I
K
x
L
Z
vxv
Item Clearance Description US Installations (per ANSI Z223.1/NFPA 54)
AClearance above grade, veranda, porch, balcony or
anticipated snow level 12 in.
B Clearance to a window or door that may be opened
9 in. for appliances > 10,000 Btu/h (3 kW)
and ≤ 50,000 Btu/h (15 kW),
12 in. for appliances > 50,000 Btu/h (15 kW)
CClearance to a permanently closed window
For clearances not specified in ANSI Z223.1/NFPA 54,
clearances shall be in accordance with
local installation codes and
the requirements of the gas supplier and the
manufacturer’s installation instructions.
See Note 1
D
Vertical clearance to a ventilated soffit located above the termi-
nal within a horizontal distance of 2 feet from
the center line of the terminal
EClearance to an unventilated soffit
FClearance to an outside corner
GClearance to an inside corner
HClearance to each side of the center line extended above elec-
trical meter or gas service regulator assembly
3 feet within 15 feet
above the meter/regulator assembly.
IClearance to service regulator vent outlet See Note 2
JClearance to non-mechanical air supply inlet to building or the
combustion air inlet to any other appliance
9 in. for appliances > 10,000 Btu/h (3 kW)
and ≤ 50,000 Btu/h (15 kW),
12 in. for appliances > 50,000 Btu/h (15 kW)
KClearance to a mechanical air supply inlet 3 feet
LClearance under a veranda, porch, deck, or balcony See Notes 1 & 2
M
Clearance to each side of the center line extended above
or below vent terminal of the furnace to a dryer or water heater
vent, or other appliance’s vent intake or exhaust
12 in.
NFurnace combustion air intake clearance to a water heater
vent, dryer or other types of appliance exhausts https://www.msn.com/en-us/feed 3 feet
OClearance from a plumbing vent stack 3 feet
PClearance above paved sidewalk or paved driveway
located on public property See Notes 1 & 2
Note: This table is based upon National codes for gas appliances, and are provided as a reference. Refer to Local codes which may supersede the standards and/
or recommendations.
Note 1: Avoid venting under a deck or large overhang. Recirculation could occur and cause performance or system problems. Ice build-up may occur.
Note 2: For clearances note specified in ANSI Z223.1/NFPA 54, clearances shall be in accordance with local installation codes and the requirements of the gas supplier
and the manufacturer’s installation instructions.
The vent for this appliance shall not terminate: a. Near the soffit vents or crawl space vents or other areas where condensate or vapor could create a nuisance or
hazard or property damage; or b. Where condensate vapor could cause damage or could be detrimental to the operation of regulators, relief valves, or other equipment.
Specifications for venting subject to change without notice.

Installation Guide |Comfort Pack T Series with up to 95% Gas Heat
13
a. Line Voltage Connections
b. Connect the single phase power supply to unit fuse blower
terminal L1 and L2
c. Connect ground wire to lug
d. Low Voltage Connections
When locating the room thermostat, it should be in the natural
circulating path of room air. Avoid locations where the thermostat
would be exposed to cold air infiltration; drafts from windows,
doors or other openings leading to the outside; exposure to air
currents from warm-or-cold air registers or to exposure where the
natural circulation of the air is cut off, such as behind doors, above
or below mantels, shelves, etc.
Electrical - High Voltage
Electrical
All wiring must be installed in accordance with applicable
codes.
The unit is factory wired for 230/1/60 power. For 208/1/60 power
systems, the wiring to the primary side of the control transformer
should be changed from the 240-volt connection to the 208-volt
connection to provide proper operation of the control system.
The operating voltage of the unit is from 196 to 244 volts.
Operating the equipment outside of these limits will void the
warranty.
Electrical Supply and Connections
All electrical wiring and connections, including electrical grounding
must be made in accordance with the National Electric Code ANSI/
NFPA No. 70 (latest edition) or, in Canada, the Canadian Electrical
Code, Part I-C.S.A. Standard C22.1. In addition, the installer should
be aware of any local ordinances or utility company requirements
that might apply.
Check the rating plate for the supply voltage and current
requirements. A dedicated line voltage supply with fused disconnect
switch should be run directly from the main electrical panel to the
unit. All external wiring must be within approved conduit and
have a minimum temperature rise rating of 60°C. Conduit from
the disconnect switch must be run so as not to interfere with the
service panels.
Controls
Field wiring between the unit and the wall thermostat (by others)
may be low voltage for Class 2 systems. The location of the wall
thermostat should be 4 to 5 feet above the floor and carefully
selected so that the thermostat senses the temperature of the
largest conditioned area, without being influenced by drafts, sun
exposure or outside temperature.
Electrical Connections
NOTE: Make certain that the volts, hertz, and phase correspond to
that specified on the unit rating plate, and that the service provided
by the utility is sufficient to handle the additional load imposed by
this equipment.
Make all electrical connections in accordance with the National
Electrical Code and any pertinent local codes or ordinances.
Use a separate branch electrical circuit for this unit. Locate a
disconnecting means within sight of and readily accessible to the
unit.
NOMINAL
VOLTAGE
MINIMUM
VOLTAGE
MAXIMUM
VOLTAGE
208-230 196 244
CC
C
SR
COMP
CH
CFM
EBM
208V
C
-+
230V
L1 L2
CC
NEUT.
XFMER
IND
IND

Installation Guide |Comfort Pack T Series with up to 95% Gas Heat
14
Electrical - Low Voltage
Low Voltage Maximum Wire Length
Table defines the maximum total length of low voltage wiring from
the outdoor unit, to the indoor unit and to the thermostat.
24 VOLTS
WIRE SIZE MAX. WIRE LENGTH
18 AWG 150 Ft.
16 AWG 225 Ft.
14 AWG 300 Ft.
LIVE ELECTRICAL COMPONENTS!
During installation, testing, servicing and
troubleshooting of this product, it may
be necessary to work with live electrical
components. Failure to follow all electrical
safety precautions when exposed to live
electrical components could result in death or
serious injury.
!WARNING
The high voltage power supply must agree with the equipment
nameplate.
OR
Make certain that the volts, hertz, and phase correspond to that
specified on the unit rating plate, and that the service provided by
the utility is sufficient to handle the additional load imposed by this
equipment.
Power wiring must comply with national, state, and local codes.
Follow instructions on unit wiring diagram located on the inside of
the access door and in the wiring diagrams included with the unit.
High Voltage Power Supply
Install a separate disconnect
switch at the location of the
Comfort Pack unit.
ON
OFF

Installation Guide |Comfort Pack T Series with up to 95% Gas Heat
15
INPUT
FAN OUTPUT-
COOLING
FAN OUTPUT-
HEATING
INDUCER FAN
RELAY
SPARK
IGNITOR
OUTPUT
MOLEX TO
HEAT
COMPONENTS
LOW
VOLTAGE
COMMON
24V
LOW
VOLTAGE
SECONDARY
24V
3 AMP
LOW
VOLTAGE
FUSE
7
180 ON ON
NEUTRALS
SPARK
TRANSFORMER
CONTROL
PLUG
FAN
OFF
DELAY
STATUS
LIGHTS
THERMOSTAT
PLUG
FUSE
Y G W R C
TEST
P3
FLAMEOK
AN2 OFF ON
SW1
AN1
1 2
F1 3 AMP
COM SEC
IND
L1 L1
MODEL 1097-211
24VAC, 60Hz., .5A MAX.
ANSI Z21.20 AUTOMATIC
1097-83-211B HSCI
HEAT
COOL
MOTOR 24 VAC
M1
TIME
90
120 160 180
SWITCH 1
OFF OFF
ON ON
SWITCH 2
ON
OFF OFF
ON
Combustion Air Proving Switch
The combustion air proving switch is a pressure sensitive switch
that monitors air pressure to ensure that proper combustion
air flow is available. The switch is a single pole/normally open
device that closes when a decreasing pressure is sensed in the
venter housing.
On start-up when the heater is cold, the sensing pressure is
at the most negative level, and as the heater warms up, the
sensing pressure becomes less negative. After the system has
reached equilibrium (about 10 minutes), the sensing pressure
levels off.
All units are equipped with a temperature activated manually
reset switch. The flame rollout switch is located centrally on
the top of the burner assembly. It is factory set and is non-ad-
justable. If the setpoint is reached, the flame rollout acts to
interrupt the electric supply to the gas valve. If the flame rollout
switch activates, identify and correct the cause before resetting
the switch. Refer to the Maintenance Section for information
on probable causes and instructions on resetting the flame
rollout switch.
The heater has a one-piece burner designed to provide
controlled flame stability without lifting or flashback with either
natural or propane gas. The burner can be removed as a unit
for inspection or service.
The main operating gas valve is powered by the 24-volt control
circuit through the thermostat and safety controls. The main
control valve is of the diaphragm type providing regulated gas
flow preset at the factory.
WARNING: THE OPERATING VALVE IS THE PRIME
SAFETY SHUTOFF. ALL GAS SUPPLY LINES MUST BE
FREE OF DIRT OR SCALE BEFORE CONNECTING THE
UNIT TO ENSURE POSITIVE CLOSURE. SEE HAZARD
INTENSITY LEVELS, PAGE 2.
Burner
Gas Valve
EXTENDED
FAN TIME
DIP SWITCH
SETTING
GREEN – CONTROL
INDICATOR LIGHT
(FAULT CODES)
YELLOW – FLAME
INDICATOR LIGHT
(FLAME ONLY)
MOLEX CONNECTION TO
T-STAT WIRE (Y-G-W-R-C)
DSI Control Identication

Installation Guide |Comfort Pack T Series with up to 95% Gas Heat
16
Comfort Pack Dimension Drawing
NOTE: Unit must be mounted a minimum of 8 inches above finished floor.
See installation guide for vent termination clearances
38 13/16"
26 57/64"
7 57/64"
43"
17 13/16"
7 21/32"
28"
3 31/32"
2 1/64"
RETURN
LOW VOLTAGE
THERMOSTAT
CONNECTION
JUCTION BOX
GAS
CONNECTION
Option (B)
Slotted Filter Door
for Open Returns
Standard Filter Door
16 17/32" 22 31/64"
7 41/64" 3 49/64"
Side view

Installation Guide |Comfort Pack T Series with up to 95% Gas Heat
17
Gas Furnace Specications
Gas Heat – The cabinet includes a gas furnace with integral flue
duct, direct spark ignition, safety controls, and operating controls.
The installation of the unit and gas piping must be in accordance
with local codes.
Gas Valve Setting 3.5"W.C.
HEAT MODULE CHS0043 CHS0050
INPUT BTUH (NG) 43,000 50,000
OUTPUT BTUH (NG) 40,850 47,500
INPUT BTUH (LP) 35,000 50,000
OUTPUT BTUH (LP) 33,250 47,500
MAXIMUM EXTERNAL STATIC PRESSURE .4" W.C .4" W.C
INLET PRESSURE (NG) 7.0" W.C. 7.0" W.C.
MANIFOLD
PRESSURE (NG) 3.5" W.C. 3.5" W.C.
INLET PRESSURE (LP) 11" W.C 11" W.C
MANIFOLD
PRESSURE (LP) 10" W.C 10" W.C
DISCHARGE
TEMPERATURE
RISE RANGE
35°F to 65°F 40°F to 70°F
BLOWER SPEED
SETTING Med. High High
MODEL SIZE 43 50
ORIFICE SIZE N.G. #50 #47
ORIFICE SIZE L.P. #60 #56
INDUCER ORIFICE SIZE 0.62 0.81
ROLLOUT LIMIT SIZE
(Manual Reset) 210°F210°F
ROLLOUT LIMIT SIZE
(Maximum Allowance) 235°F 235°F
Main Air Limit Size
(Auto Reset) 140/-40°F 140/-40°F
Inducer Limit Size
(Manual Reset) 160°F 160°F
Nominal
Temperature Rise 50°F 55°F
Allowable Air
Temperature Range 135-165 140-170
CO2% - Acceptable Range 6 to 7 6 to 7
CO Air Free - PPM 0-200 0-200
Collector Box
Pressure Switch -0.3+/-0.05 -0.6+/-0.05
Inducer Pressure
Switch -0.9+/-0.05 -0.7+/-0.05
Stack Temperature 80-140 80-140
Sequence of Operations (Gas Heat)
1. Call for Heat – The thermostat sends a call for heat therefore
energizing the “white” wire to the control board. The control checks
to see that the limit switch is closed and the pressure switch is
open. If the limit switch is open, the control responds as defined
in the “Limit Switch Operation - page 22”. If the pressure switch is
closed, the control will do four flashes on the green LED and wait
indefinitely for the pressure switch to open. If the pressure switch
is open, the control proceeds to (2.) Pre-purge.
2. Pre-purge – The control energizes the venter motor and waits for
the pressure switch to close. If the pressure switch does not close
within 240 seconds of the venter motor energizing, on 3 attempts,
the control green LED will flash two times and will enter a soft lock
out. When the pressure switch is proven closed, the control begins
the pre-purge time. If flame is present any time while in pre-purge,
the pre-purge time is restarted. If flame is present long enough to
cause lockout, the control responds as defined in “Undesired Flame
- page 22”. The control runs the venter motor for a 30 second pre-
purge time, then proceeds to the (3.) Ignition Trial Period.
3. Ignition Trial Period – The control energizes the spark
and main gas valve. The venter remains energized. If flame is
sensed during the first 10 seconds, the spark is de-energized
and the control proceeds to (4.) Heat Blower On Delay. If flame
has not been sensed during the first 10 seconds, the control
de-energizes the spark output and keeps the gas valve energized
for an additional one second flame proving period. If flame is not
present after the flame proving period, the control de-energizes
the gas valve and proceeds with ignition re-tries as specified in
“Ignition Retry - page 18”. If flame is present, the control proceeds
to the (4.) Heat Blower On Delay
4. Heat Blower On Delay – The control waits for 20 seconds from
the time the gas valve opened and then energizes the blower motor.
The gas valve and venter motor remain energized. The control
proceeds to (5.) Steady Heat.
5. Steady Heat – The control continuously monitors to the
safeties (high limit, roll-out, and pressure) for open switches,
flame sensor for proving, and the thermostat for a call for
heat. When the thermostat call for heat is removed, the control
de-energizes the gas valve and begins (6.) Post-purge and
(7.) Blower Off Delay.
6. Post-purge – The venter motor output remains on for a
30-second post-purge period after the thermostat is satisfied.
7. Blower Off Delay – The blower motor is de-energized after a
blower off delay 120 seconds factory setting (field adjustable, see
page 15 or 37). Timing begins when the thermostat is satisfied.

Installation Guide |Comfort Pack T Series with up to 95% Gas Heat
18
Abnormal Functions
• Interrupted Thermostat Call for Heat – If the thermostat demand
for heat is removed before the flame is recognized, the control will
run the venter motor for the post purge period and de-energize
all outputs. If the thermostat demand for heat is removed after
successful ignition, the control will de-energize the gas valve, run
the venter motor through post purge, and run the blower motor on
heat speed for the selected delay off time.
• Soft Lockout – The control shall not initiate a call for heat or call
for continuous fan while in lockout. The control will still respond
to an open limit and undesired flame. Lockout shall automatically
reset after one hour. Lockout may be manually reset by removing
power from the control for more than one second or removing
the thermostat call for heat for more than one and less than 20
seconds.
• Hard Lockout – If the control detects a fault on the control board,
the status LED will be de-energized, and the control will lockout as
long as the fault remains. A hard lockout will automatically reset if
the hardware fault clears.
• Power Interruption – During a momentary power interruption or at
voltage levels below the minimum operating voltage for line voltage
the system will self-recover without lockout when voltage returns
to the operating range. During a momentary power interruption of
low voltage the board will enter a soft lockout. Power interruptions
of less than 80ms shall not cause the control to change operating
states. Power interruptions greater than 80ms may cause the
control to interrupt the current operating cycle and re-start.
• Ignition Retry – If flame is not established on the first trial for
ignition, the control de-energizes the gas valve and the venter
motor remains energized for an inter-purge period of 30 seconds.
The spark and gas valve are then re-energized, and the control
initiates another trial for ignition. If flame is not established on the
second trial for ignition, the control de-energizes the gas valve,
energizes the blower motor on heat speed, and venter motor
remains energized. The blower motor is shut off after 180 seconds.
When the blower motor de-energizes, the spark and gas valve are
re-energized and the control initiates another trial for ignition. (This
blower delay is a self-healing feature for an open auxiliary limit
switch). If flame is not established on the third trial for ignition, the
control de-energizes the gas valve, and the venter motor remains
energized for an inter-purge period of 20 seconds. The control
then re-energizes the gas valve and spark and initiates another trial
for ignition. If flame is not established on the fifth trial for ignition
(initial try plus 4 re-tries), the control de-energizes the gas valve
and goes into lockout. The control goes to one flash on the green
LED to indicate ignition failure lockout.
• Condensate Freeze Protection – If the burner compartment
temperature falls to 41°F ± 9°F, the safety thermostat switch will
close and energize the condensate heater. The heater will remain
energized until the burner compartment reaches a temperature of
68°F ± 9°F. This heater will operate independently of the furnace's
standard sequence of operation.
Installation Codes
These units must be installed in accordance with local building
codes. In the absence of local codes, in the United States, the units
should be installed in accordance with the National Fuel Gas Code
(latest edition). A Canadian installation must be in accordance with
the CAN/CGA-B149.1 and B149.2 Installation Code for Gas Burning
Appliances and Equipment. These codes are available from CSA
Information Services, 1-800-463-6727. Local authorities having
jurisdiction should be considered before installation is made to
verify local codes and installation procedure requirements.
High Altitude Operation
If the heater is being installed at an elevation above 2000 ft.
(610m), the input rate will have to be derated. This is done by
adjusting the valve outlet pressure (See page 22). Adjusting the
valve outlet pressure is done after the heater is in operation; follow
the instructions below. (see Figure 1).
Figure 1
Heat Section Burner/Control Compartment
(Note: Unit side panel is not shown for clarity; the side panel is not
removable. Access to the burner/control compartment is through
the rear access panel.)

Installation Guide |Comfort Pack T Series with up to 95% Gas Heat
19
Derating by Valve Outlet Pressure
Adjustment for High Altitude Operation
Instructions
1.Determine the required valve outlet pressure for the elevation
where the heater will be operating. If unsure of the elevation,
contact the local gas supplier.
Input BTU/HR = Heating Value of Gas (BTU/Ft3) x 3600 x correction factor
Time in Seconds (for 1 cu.ft.) of Gas
METER TIME IN MINUTES AND SECONDS FOR NORMAL
INPUT RATING OF FURNACES EQUIPPED FOR NATURAL OR LP GAS
INPUT
BTU/HR
METER
SIZE
CU. FT.
HEATING VALUE OF GAS BTU PER CU. FT.
900 1000 1040 1100 2500
MIN. SEC. MIN. SEC. MIN. SEC. MIN. SEC. MIN. SEC.
50,000 ONE
TEN
1
10
5
50
1
12
12
00
1
12
15
30
1
13
18
12
3
30
20
00
75,000 ONE
TEN
0
7
44
12
0
8
48
0
0
8
50
19
0
8
53
48
2
20
0
0
100,000 ONE
TEN
0
5
33
24
0
6
36
0
0
6
38
15
0
6
40
36
1
15
30
0
125,000 ONE
TEN
0
4
26
19
0
4
29
48
0
5
30
0
0
5
32
17
1
12
12
0
150,000 ONE
TEN
0
3
31
36
0
4
24
0
0
4
25
10
0
4
26
20
1
10
0
0
NOTE: THIS ADJUSTMENT CAN ONLY BE DONE
AFTER THE HEATER IS IN OPERATION. IT IS
INCLUDED IN THE STARTUP PROCEDURES.
2. With the manual valve positioned to prevent flow to the main
burner, connect a manometer to the 1/8"pipe outlet pressure
tap in the valve. Use a water column manometer that is readable
to the nearest tenth of an inch.
3. Remove the cap from the pressure adjusting screw
and adjust the valve outlet pressure to the pressure
setting selected from the table. Cycle the main burner once or
twice to properly seat the adjustment spring in the valve. Re-
check the pressure. If necessary, re-adjust the pressure. When
the pressure is correct, remove the manometer and replace the
cap. Check for leaks at the pressure tap fitting.
4. With the heater operating determine that the inlet pressure to
the heater for natural gas is between 4.5 and 10 inches w.c., and
for propane between 11 and 14 inches w.c. Take this reading as
close as possible to the heater (heaters are equipped with gas
valves that have an inlet pressure tap.) If the inlet is not within
the specified range, the inlet pressure must be corrected and
Steps 3 and 4 repeated.
5. Find the Valve Outlet Pressure Adjustment label in the plastic bag
that contained these instructions. Using a permanent marker, fill
in the pressure setting. Adhere the label on the heater near the
gas valve so that it is conspicuous to someone serving the valve.
NATURAL GAS - HIGH HEATING VALUE
MANIFOLD PRESSURE (GAS VALVE
SETTING FOR NAT. GAS)
ALTITUDE ABOVE
THE SEA LEVEL CHS0043 CHS0050
0 TO 1,999 FT 50 47 Factory Orifice Size
3.5 3.5 Manifold Pressure
2,000 to 2,999 FT 49 47 Orifice Size
3.2 3.2 Manifold Pressure
3,000 to 3,999 FT 49 47 Orifice Size
3.0 3.0 Manifold Pressure
4,000 to 4,999 FT 49 47 Orifice Size
2.8 2.8 Manifold Pressure
5,000 to 5,999 FT 49 47 Orifice Size
2.5 2.5 Manifold Pressure
6,000 to 6,999 FT 50 49 Orifice Size
3.0 3.1 Manifold Pressure
7,000 to 7,000 FT 50 49 Orifice Size
2.9 3.0 Manifold Pressure
8,000 to 8,900 FT 50 49 Orifice Size
3.0 3.0 Manifold Pressure
9,000 to 9,999 FT 50 49 Orifice Size
2.9 2.9 Manifold Pressure
High Altitude Deration Chart for Natural Gas - High Heating Value
NATURAL GAS - LOW HEATING VALUE
MANIFOLD PRESSURE (GAS VALVE
SETTING FOR NAT. GAS)
ALTITUDE ABOVE
THE SEA LEVEL CHS0043 CHS0050
0 TO 1,999 FT 50 47 Factory Orifice Size
3.5 3.5 Manifold Pressure
2,000 to 2,999 FT 49 47 Orifice Size
3.5 3.5 Manifold Pressure
3,000 to 3,999 FT 49 47 Orifice Size
3.4 3.4 Manifold Pressure
4,000 to 4,999 FT 49 47 Orifice Size
3.2 3.2 Manifold Pressure
5,000 to 5,999 FT 49 47 Orifice Size
3.0 3.0 Manifold Pressure
6,000 to 6,999 FT 50 49 Orifice Size
3.1 3.5 Manifold Pressure
7,000 to 7,000 FT 50 49 Orifice Size
2.9 3.2 Manifold Pressure
8,000 to 8,900 FT 50 49 Orifice Size
3.0 3.0 Manifold Pressure
9,000 to 9,999 FT 50 49 Orifice Size
2.9 2.9 Manifold Pressure
High Altitude Deration Chart for Natural Gas - Low Heating Value
PROPANE GAS
MANIFOLD PRESSURE (GAS VALVE SETTING
FOR LP GAS)
ALTITUDE ABOVE THE
SEA LEVEL CHS0043 CHS0050
0 to 1,999 FT 60 56 Conversion to LP Orifice Size
10 10 Manifold Pressure
2,000 to 2,999 FT 60 56 Orifice Size
9.2 9.2 Manifold Pressure
3,000 to 3,999 FT 60 56 Orifice Size
8.7 8.7 Manifold Pressure
4,000 to 4,999 FT 60 56 Orifice Size
8.5 8.5 Manifold Pressure
5,000 to 5,999 FT 61 58 Orifice Size
9.6 9.6 Manifold Pressure
6,000 to 6,999 FT 61 58 Orifice Size
9.2 9.2 Manifold Pressure
7,000 to 7,999 FT 61 58 Orifice Size
8.8 8.8 Manifold Pressure
8,000 to 8,999 FT 61 58 Orifice Size
8.5 8.5 Manifold Pressure
9,000 to 9,999 FT 61 58 Orifice Size
8.5 8.5 Manifold Pressure
High Altitude Deration Chart for Natural Gas - High Heating Value

Installation Guide |Comfort Pack T Series with up to 95% Gas Heat
20
ALTITUDE ABOVE
SEA LEVEL
LOCAL HEATING VALUE, BTU PER CUBIC FOOT
650 700 750 800 850 900 950 1,000 1,050
2,000 FT LOW LOW LOW LOW LOW LOW HIGH HIGH HIGH
3,000 FT LOW LOW LOW LOW LOW LOW HIGH HIGH HIGH
4,000 FT LOW LOW LOW LOW LOW HIGH HIGH HIGH HIGH
5,000 FT LOW LOW LOW LOW LOW HIGH HIGH HIGH HIGH
6,000 FT LOW LOW LOW LOW HIGH HIGH HIGH HIGH HIGH
7,000 FT LOW LOW LOW LOW HIGH HIGH HIGH HIGH HIGH
8,000 FT LOW LOW LOW HIGH HIGH HIGH HIGH HIGH HIGH
9,000 FT LOW LOW LOW HIGH HIGH HIGH HIGH HIGH HIGH
10,000 FT LOW LOW HIGH HIGH HIGH HIGH HIGH HIGH HIGH
Heating values for Natural Gas
Clearances
Clearance to combustibles is defined as the minimum distance
from a heater to a surface or object that is necessary to ensure
that a surface temperature of 90°F above the surrounding
ambient temperature is not exceeded. Minimum clearance
to combustibles from all sides of this properly installed unit
is zero inches. Adequate clearances must be provided to
allow installation of the union and shutoff valve, as well as
accessibility to wiring and control compartments. If this unit
is installed in an attic or other insulated space, it must be kept
free and clear of insulating material. The area must be inspected
when the unit is installed or insulation is added. Some insulating
materials may be combustible. (See page 12 for other clearances)
Venting
The venting system is an integral part of the heater as shipped to you.
Do not modify or add to the vent system. The heat section includes
an exhaust blower. The blower draws the combustion products out
of the heat exchanger, mixes combustion products with dilution air
and forces the mixture to the outside. A chimney is not required. No
special provisions are required for supplying air for combustion. Do
not alter or extend the vent outlet. The venting system is designed
for proper operation under all weather conditions and for winds up
to 40 mph. (See page 12 for locating vent)
Gas Piping and Pressures
THE HEATER IS EQUIPPED FOR A MAXIMUM
GAS PRESSURE RESPECTIVE TO THE FUEL
BEING USED. CONSULT APPROPRIATE
TABLES WITHIN THIS MANUAL FOR RATED
MAXIMUM SUPPLY PRESSURE. SUPPLY
PRESSURES HIGHER THAN THE MAXIMUM
REQUIRES INSTALLATION OF AN ADDITIONAL
LOCKUP-TYPE SERVICE REGULATOR
EXTERNAL TO THE UNIT.
!WARNING
Gas piping external to the unit must include: a manual
shutoff valve with 1/8" NPT plugged tapping (for test
gauge connection), drip leg and ground union tting.
If the supply air from the unit is ducted to space(s)
outside the space containing the unit, the return air
must be ducted from outside the space containing the
unit and sealed to the unit cabinet return air opening.
Pressure Testing Supply Piping
Test Pressures Above 1/2 PSI: Disconnect the heat manual valve
from the gas supply line that is to be tested. Cap or plug the
supply line.
Test Pressures Below 1/2 PSI: Before testing, close the manual
valve on the heater.
All piping must be in accordance with requirements outlined
in the National Fuel Gas Code ANSI/Z223,1a (latest edition) or
CAN/ CGA-B149.1 and B149.2. Gas supply piping installation
should conform with good practice and the local codes. Support
gas piping with pipe hangers, metal strapping or other suitable
material; do not rely on the heater to support the gas pipe.
CAPACITY OF PIPING
Cubic Feet Per hour Based on 0.3” w.c. Pressure Drop
Specic Gravity for Natural Gas - 0.6 (Natural Gas - 1000 BTU/Cubic Feet)
Specic Gravity for Propane Gas - 1.6 (Propane Gas - 2550 BTU/Cubic Feet)
LENGTH
OF
PIPE
DIAMETER OF PIPE
1/2” 3/4” 1” 1 1/4” 1 1/2” 2”
NATURAL PROPANE NATURAL PROPANE NATURAL PROPANE NATURAL PROPANE NATURAL PROPANE NATURAL PROPANE
20’ 92 107 190 116 350 214 730 445 1100 671 2100 1281
30’ 73 45 152 93 285 174 590 360 890 543 1650 1007
40’ 63 38 130 79 245 149 500 305 760 464 1450 885
50’ 56 34 115 70 215 131 440 268 670 409 1270 775
60’ 50 31 105 64 195 119 400 244 610 372 1105 674
70’ 46 28 96 59 180 110 370 226 560 342 1050 641
80’ 43 26 90 55 170 104 350 214 530 323 990 604
90’ 40 24 84 51 160 98 320 195 490 299 930 567
100’ 38 23 79 48 150 92 305 186 460 281 870 531
125’ 34 21 72 44 130 79 275 168 410 250 780 476
150’ 31 19 64 39 120 73 250 153 380 232 710 433
160’ 28 17 59 36 110 67 225 137 350 214 650 397
170’ 26 16 55 34 100 61 210 128 320 195 610 372
Note: When sizing lines, consider possibilities of future expansion
and increased requirements. Refer to National Fuel Gas Code for
additional information on line sizing.
The heater is orificed for operation with natural gas having a
heating value of 1000 (+/-50) BTU/H per cubic feet or propane
gas with a heating valve of 2500 (+/-100) BTU/H per cubic feet.
If the gas at the installation does not meet these specifications,
consult the factory for proper orificing. Pipe joint compounds
(pipe dope) shall be resistant to the action of liqueed
petroleum gas or any other chemical constituents of the gas
being supplied.
Install a ground joint union and manual shut off valve upstream
of the unit control system, as shown in Figure 2. The 1/8"