National Comfort Product CPG41238-U Series User manual

This unit should
be installed in an
OUTSIDE WALL FOR
THRU-THE-WALL
INSTALLATION ONLY!
Please read the entire installation guide before starting the installation.
National Comfort Products®
A Division of National Refrigeration & Air Conditioning Products, Inc.
539 Dunksferry Road • Bensalem, PA 19020 • [phone] • 1-800-523-7138 • Fax: [phone]
CPG
U-Models
Gas
Heating
Electric
Cooling
HEATING & A/C EQUIPMENT
NATIONAL
COMFORT
PRODUCTS
®
Thru-the-Wall Packaged Heating & Cooling Units
Comfort Pack
Universal Series
Installation
Guide
80%
THERMAL
EFFICIENCY

Table of Contents
Safety First .......................................................... page 3-4
Before You Start ................................................... page 4
Installation ............................................................ page 6
Drainage................................................................ page 6
Clearances ............................. page 7
Unit Location Considerations ....................page 8
Vent Termination Clearances ................................ page 9
Electrical ............................................................... page 10-12
Dimensions ..........................................page 13
Gas Furnace Specifications........................page 14
Sequence of Operations (Gas Heat) ...................... page 14
Abnormal Functions ............................page 15
High Altitude Operation .............................page 15-16
Gas Piping, Venting & Pressures ........................ page 17-19
Ignition System .......................................... page 19-20
Start up .......................................... page 20-21
Special Notes for Extremely Cold Weather Areas.. page 21-22
Gas Control Valve .................................... page 22
Maintenance and Service ..................... page 22-27
Slide Out Furnace Instructions .....................page 27-28
Equipment Specifications...................................... page 29
Air Flow ................................................................ page 30-32
Wiring Diagram .................................................... page 33-34
Trouble Shooting ................................................. page 35-36
Replacement Parts Guide .................................... page 37-38
Warranty ............................................................. page 39-41
Engineering Specification Guide .......................... page 42
Notes ................................................................... page 43
Comfort Pack Nomenclature
C P G 4 1 8 38 - U ** *
CP=Comfort
Pack
G=Gas
E=Electric
4=410A
Refrigerant
U=Universal Chassis
*
*
=Edition
=Generation
Nominal
Cooling Capacity
12=12,000Btu
18=18,000Btu
24=24,000Btu
30=30,000Btu
A=No Grille
B=Slotted Filter Door
C=No Grille, with
Slotted Filter Door
Heating Capacity
Electric
05=5 Kilowatt
07=7.5 Kilowatt
10=10 Kilowatt
15=15 Kilowatt
Gas Input
38=38,000Btu
51=51,000Btu
64=64,000Btu
*Note:Standard units (with nooptions) will have no letter after the “U” in the name.
Example: CPG41838-U
Model Number
Options,
if used
Last 2 Digits
for factory use
IMPORTANT NOTE: DO NOT DESTROY OR THROW AWAY THIS MANUAL. IT
SHOULD BE KEPT IN A SAFE PLACE FOR FUTURE REFERENCE.

Installation Guide for Comfort Pack (CPG) Units
3
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
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
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.
!CAUTION
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
“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
Installation and repair of this unit should be performed ONLY by individuals
meeting the requirements of an “entry level technician” as specied by
National Codes. Attempting to install or repair this unit without such
background may result in product damage, personal injury or death.
!WARNING
Use care when handling scroll compressors. Some temperatures could be hot!
!CAUTION
Scroll 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.
!CAUTION
THE UNIT MUST BE PERMANENTLY GROUNDED. FAILURE TO DO SO CAN
CAUSE ELECTRICAL SHOCK RESULTING IN SEVERE PERSONAL INJURY
OR DEATH.
!WARNING
If the information in this manual is not
followed exactly, a re 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
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.
!WARNING
This furnace must be installed in accordance with the
manufacturer’s instructions and local codes. In the
absenceof local codes, follow theNational FuelGas Code,
ANSI Z223.1 or the CAN/CGA-B149 Installation Codes.
To be installed without alteration.
Safety First!
Start up .......................................... page 20-21
Special Notes for Extremely Cold Weather Areas.. page 21-22
Gas Control Valve .................................... page 22
Maintenance and Service ..................... page 22-27
Slide Out Furnace Instructions .....................page 27-28
Equipment Specifications...................................... page 29
Air Flow ................................................................ page 30-32
Wiring Diagram .................................................... page 33-34
Trouble Shooting ................................................. page 35-36
Replacement Parts Guide .................................... page 37-38
Warranty ............................................................. page 39-41
Engineering Specification Guide .......................... page 42
Notes ................................................................... page 43

Installation Guide for Comfort Pack (CPG) Units
4
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.
THESE INSTRUCTIONS ARE INTENDED AS AN AID TO QUALIFIED,
LICENSED SERVICE PERSONNEL FOR PROPER INSTALLATION,
ADJUSTMENT AND OPERATION OF THIS UNIT. READ THESE
INSTRUCTIONS THOROUGHLY 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.
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
!WARNING
!CAUTION
Safety First!
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,
29” 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 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).
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 and louvered grille provided must be removed.
Consult the factory prior to ordering product(s) that require an
optional architectural grille.

Installation Guide for Comfort Pack (CPG) Units
5
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 LOWER
ACCESS PANEL 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.
REMOVE THE SCREWS ATTACHING THE CONTROLS
ENCLOSURE TO THE INDOOR COIL COVER. REMOVE THE
SCREWS FROM THE INDOOR BLOWER COVER PLATE.
REMOVE THE PLATE FROM 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
REMOVAL.
CAREFULLY SLIDE THE CHASSIS OUT OF THE CABINET
BY GRASPING BOTH SIDES OF 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 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 THE CHASSIS 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.
INSTALL THE INDOOR BLOWER COVER PLATE AND
SECURE IT WITH SCREWS. INSTALL THE CHASSIS
POWER WIRE CONNECTOR AND THE CONTROL WIRING
CONNECTOR INTO THEIR RESPECTIVE CABINET WIRING
CONNECTORS SO THAT THE CONNECTORS LATCH.
POSITION THE CONTROLS ENCLOSURE AND SECURE IT
TO THE INDOOR COIL COVER WITH SCREWS. 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 PANEL
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 specified 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.

Installation Guide for Comfort Pack (CPG) Units
6
enough to allow for return air provisions to the unit. 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).
Provide the unit with support inside the building in the area of
the return air opening. Slide the unit into the wall sleeve and
fasten the unit to the sleeve with the five screws provided with
the 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.
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.
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)
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. Should further information be desired or should
particular problems arise which are not covered sufficiently
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: These installation and maintenance
instructions should be left with the unit for
future reference.
INSTALLATION:
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. THIS
CONDITION WILL ALSO DEGRADE THE PERFORMANCE
OF THE UNIT AND MAY VOID EQUIPMENT WARRANTY.
The unit should be provided with support inside the building in
the area of the return air opening. The support should be high

Installation Guide for Comfort Pack (CPG) Units
7
Clearances
For proper unit performance and maximum operating life please
maintain the following minimum installation clearances.
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.
Secondary Drain Trap Install Instructions:
1. The trap and 3” 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.
Secondary Drain Connection
Drain Pan
1/2” I.D. Tubing
Grommet
Trap
Chassis Base
“Squeeze”
3. Position the trap as shown and slide the 3” piece of clear
flexible about 1 1/2” onto the top end of the trap. Install the other
end of the trap through the grommet in the slide-out chassis
under the indoor coil drain pan. 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.
4. 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.

Installation Guide for Comfort Pack (CPG) Units
8
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 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 units 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. 29” 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 min.
of 60’’ vertical 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 page 17.

Installation Guide for Comfort Pack (CPG) Units
9
Vent Termination Clearances for Direct Vented Installations in the USA
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
For other gas venting information see page 7.
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 Btuh (3 kW)
and </= 50,000 Btuh (15 kW),
12in. for appliances > 50,000 Btuh (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 Btuh (3 kW)
and </= 50,000 Btuh (15 kW),
12in. for appliances > 50,000 Btuh (15 kW)
KClearance to a mechanical air supply inlet 3 feet
LClearance under a veranda, porch, deck, or balcony Note 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
12in.
NFurnace combustion air intake clearance to a water heater
vent, dryer or other types of appliance exhausts 3 feet
OClearance from a plumbing vent stack 3 feet
PClearance above paved sidewalk or paved driveway
located on public property See Note 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 for Comfort Pack (CPG) Units
10
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
NOMINAL
VOLTAGE
MINIMUM
VOLTAGE
MAXIMUM
VOLTAGE
208-230 197 253
CC
C
SR
COMP
C
F
H
CFM
EBM
208V
C
-+
230V
L1 L2
CC
NEUT.
XFMER
IND
IND
U12
CBR
HBR
COOL
HEAT
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 197 to 253 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.

Installation Guide for Comfort Pack (CPG) Units
11
High Voltage Power Supply
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, or cabinet and in the wiring diagrams included
with the unit.
ON
OFF
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.
Install a separate disconnect
switch at the location of the
through the wall unit.
Thru-the-Wall
Comfort Pack (CPG) Unit

Installation Guide for Comfort Pack (CPG) Units
12
DSI Control Identication
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
HEAT
HEAT LOW
COOL
HEAT HIGH
EAC/BLO
MODEL 1097-211
24VAC, 60Hz., .5A MAX.
ANSI Z21.20 AUTOMATIC
1097-83-211B HSCI
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)

Installation Guide for Comfort Pack (CPG) Units
13
Comfort Pack Dimension Drawing
Option (B)
Slotted Filter Door
for Open Returns
Note: Unit must be
mounted a minimum
of 8” above finished floor.
National Comfort Products offers
Architectural Louver Grilles for all models.
Outdoor grilles provided by others must be
approved by National Comfort Products to
maintain unit performance and warranty
coverage. See Architectural Louver Grilles
Specication Sheet for more details.
Supply
Return
FRONT TO
43"
1 3/32"
15 13/16"
11 1/16"
3 3/4"
31 7/16"
7 11/16"
20 1/8"
1 23/32"
4 11/32"
26 9/32"
28"
DRAIN TUBE
OPENING
24"
7 3/4"
7 15/16"
OPENING
23 9/16”
7 15/16”
OPENING
15/16”
Junction Box
Gas Connection
Low Voltage
Thermostat
Connection
Solid Filter Door
for Ducted Returns
Patch
Plate

Installation Guide for Comfort Pack (CPG) Units
14
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 14208309 14208308 14208303
INPUT BTUH 38,000 51,000 64,000
OUTPUT BTUH 30,400 40,800 51,200
MAXIMUM EXTERNAL
STATIC PRESSURE .5" W.C. .5" W.C .5" W.C
DISCHARGE
TEMPERATURE RISE
RANGE
45°F to 60°F 45°F to 65°F 60°F to 80°F
BLOWER SPEED
SETTING
Med. Low*
(4-Black)
Med. High*
(2-Yellow)
High*
(1-Red)
*See Wiring Diagram on Page 33.
To ensure safe operation and long life of the heat exchanger, the
maximum static pressure and/or maximum temperature rise must not
be exceeded. Operation of the heater at conditions that exceed the
heater’s specications will void the heat exchanger warranty
MODEL SIZE 38 51 64
ORIFICE SIZE N.G. 31 28 22
ORIFICE SIZE L.P. 49 2.1 mm 41
NOMINAL
TEMPERATURE RISE 52.5°F 55°F 67°F
ALLOWABLE AIR
TEMPERATURE RANGE 140-160 140-160 135-160
CO2 %- ACCEPTABLE
RANGE 4.5 to 5.2 4.8 to 5.8 4.5 to 5.5
CO AIR FREE - PPM 0 - 200 0 - 200 0 - 200
SENSING COLD 1.05 +/- .1 1.05 +/- .1 1.05 +/- .1
PRESSURE HOT .8+/- .05 .8+/- .05 .8+/- .05
EFFICIENCY RANGE 81.5% - 82.5% 81.5% - 82.5% 80.1% - 81.1%
STACK TEMPERATURE 245°F- 300°F 245°F- 300°F 270°F- 330°F
Temperature Rise Range Based On Return Air Temperature
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 9”. 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 18”. The control runs the
venter motor for a 20 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 16 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 16 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 9”. If flame is present, the control proceeds
to the (4.) Heat Blower On Delay
4. Heat Blower On Delay – The control waits for 30 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
45-second post-purge period after the thermostat is satisfied.
7. Blower Off Delay – The blower motor is de-energized after a
blower off delay 90 seconds factory setting (field adjustable, see
page 17 or 50). Timing begins when the thermostat is satisfied.

Installation Guide for Comfort Pack (CPG) Units
15
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 20 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 a short
period. 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 10
seconds. The control then re-energizes the gas valve and spark
and initiates another trial for ignition. If flame is not established
on the fourth trial for ignition (initial try plus 3 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.
Installation Codes
These units must be installed in accordance with local
building codes. In the absence of local codes, in the United
States, the just 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 34).
In addition, if the heater is being installed at an altitude
above 6000 ft. (1830M), the pressure switch will have to
be changed. Adjusting the valve outlet pressure is done
after the heater is in operation; follow the instructions
below. If the pressure switch needs changed, do that
before the heater is operated (see Figure 1).
Figure 1
Heat Section Burner/Control Compartment
(Note: Unit side panel is removed for clarity; side panel is not
removable. Access to the burner/control compartment is through
the small rear access panel.

Installation Guide for Comfort Pack (CPG) Units
16
Instructions for Changing Pressure Switch
1. Open the burner/control compartment access panel. Locate
the pressure switch.
2. Mark and disconnect the two wires attached to the pressure
switch.
3. Disconnect the flow sensing tubing from the pressure switch.
4. Locate the two screws holding the switch mounting bracket.
Remove the screws (save screws) and the pressure switch.
5. Install the high altitude pressure switch. Attach the sensing
tube and wires. Replace access panel.
SIZE P/N DESCRIPTION
ALL 14208325 Set to break on pressure
increase @ -0.5” w.c.
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.
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
Input BTU/HR = Heating Value of Gas (BTU/Ft3) x 3600 x correction factor
Time in Seconds (for 1 cu.ft.) of Gas
NOTE: THIS ADJUSTMENT CAN ONLY
BE DONE AFTER THE HEATER IS IN
OPERATION. IT IS INCLUDED IN THE
STARTUP PROCEDURES
VALVE OUTLET PRESSURE
SETTINGS BY ELEVATION
ALTITUDE NATURAL
GAS
(Inches w.c.)
PROPANE
GAS
(Inches
w.c.)
Feet Meters
0-2000 ALL 3.5 10.0
2001-3000 ALL 2.8 7.7
3001-4000 ALL 2.5 7.1
4001-5000 ALL 2.3 6.4
5001-6000 ALL 2.1 5.8
6001-7000 ALL 1.9 5.2
7001-8000 ALL 1.7 4.6
8001-9000 ALL 1.5 4.1
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 5 and 13.5 inches
w.c., and for propane between 10 and 13.5 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.

Installation Guide for Comfort Pack (CPG) Units
17
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 9 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 9 for
locating vent)
Gas Piping and Pressures
THIS HEATER IS EQUIPPED FOR A MAXIMUM
GAS SUPPLY PRESSURE OF 1/2 POUND, 8
OUNCES OR 14 INCHES WATER COLUMN.
SUPPLY PRESSURE HIGHER THAN 1/2
POUND 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
Specific Gravity for Natural Gas - 0.6 (Natural Gas - 1000 BTU/Cubic Feet)
Specific 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) BTUH per cubic feet or propane
gas with a heating valve of 2500 (+/-100) BTUH 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 liquefied
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” plugged
tapping in the shut off valve provides connection for a supply
line pressure test gauge**. The National Fuel Gas Code requires
the installation of a trap with a minimum 3” drip leg. Local codes
may require a minimum drip leg longer than 3” (typically 6”).
Gas connection is 1/2”. Leak-test all connections by brushing on
a leak-detecting solution.

Installation Guide for Comfort Pack (CPG) Units
18
ALL COMPONENTS OF A GAS SUPPLY
SYSTEM MUST BE LEAK TESTED PRIOR
TO PLACING EQUIPMENT IN SERVICE.
NEVER TEST FOR LEAKS WITH AN
OPEN FLAME. FAILURE TO COMPLY
COULD RESULT IN PERSONAL INJURY,
PROPERTY DAMAGE OR DEATH.
!WARNING
Gas Connection and View
Figure 2
Access Panels and Heat Exchanger Inspection Panel
Duct Work
(supplied by others)
Upper Cabinet
Houses the Heat Exchanger
Cooling Section
(lower cabinet)
Gas Shut Off
(supplied by others)
Drip Leg
(supplied by others)
Ground Union
(supplied by others)
Gas Valve
Burner/Control Compartment
w/ Access Panel Removed
Burner Assembly
*Install the heat exchanger inspection panel in the ductwork in
such a manner that will prevent air leaks.
**1/8” NPT plugged tapping for test gauge not permitted in the
Massachusetts.
Valve Outlet Gas Pressure Setting
Measuring valve outlet gas pressure cannot be done until the
heater is in operation. Normally adjustments should not be
necessary to the factory preset regulator (also, see paragraph on
high altitude operation). If adjustment is necessary, the following
warnings and instructions apply.
VALVE OUTLET GAS PRESSURE MUST
NEVER EXCEED 3.5” W.C. FOR NATURAL
GAS AND 10” W.C. FOR PROPANE GAS.
!WARNING
For Natural Gas: When the heater leaves the factory, the
combination gas valve is set so that the valve outlet gas pressure
is regulated to 3.5” w.c. Inlet supply pressure to the valve for
natural gas must be a minimum of 5” w.c. and a maximum of 14”
w.c. Normally, field adjustment should not be required.
For Propane Gas: When the heater leaves the factory, the
combination gas valve is set so that the valve outlet gas pressure
is regulated to 10” w.c. Inlet supply pressure to the valve for
propane gas must be a minimum of 11” w.c. and a maximum of
14” w.c. Normally, field adjustment should not be required.
Before attempting to measure or adjust valve outlet gas pressure,
the inlet supply pressure must be within the specified range both
when the heater is in operation and on standby.
Incorrect inlet pressure could cause excessive valve outlet gas
pressure immediately or at some future time. If natural gas
supply pressure is too high, install a regulator in the supply line
before it reaches the heater. If natural gas supply pressure is too
low, contract your gas supplier.
Instructions on How to Check Valve Outlet
Pressure
(can only be done after heater is installed):
1. 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. NOTE: A manometer (fluid-field gauge) is
recommended rather than a spring type gauge due to the
difficulty of maintaining calibration of a spring type gauge.
2. Open the valve and operate the heater. Measure the gas pressure
at the outlet of the automatic gas valve. Normally adjustments
should not be necessary to the factory-preset regulator. If

Installation Guide for Comfort Pack (CPG) Units
19
adjustment is necessary, set pressure to correct settings
by turning the regulator screw IN (clockwise) to increase
pressure. Turn regulator screws OUT (counterclockwise) to
decrease pressure. (See Figure 4 on Page 22)
ROUTE THE WIRES SO THAT THEY DO NOT
CONTACT THE FLUE GAS COLLECTION
BOX OR VENTER HOUSING. CONSULT
THE WIRING DIAGRAM SUPPLIED WITH
YOUR HEATER.
IF ANY OF THE ORIGINAL WIRES AS
SUPPLIED WITH THE APPLIANCE MUST
BE REPLACED, IT MUST BE REPLACED
WITH WIRING MATERIAL HAVING A
TEMPERATURE RATING OF AT LEAST
105°C, EXCEPT FOR LIMIT CONTROL,
FLAME ROLLOUT SWITCH AND SENSOR
LEAD WIRES, WHICH MUST BE 150°C.
PLEASE SEE “HAZARD INTENSITY
LEVELS”.
!CAUTION
Ignition System
This heater is equipped with a direct spark integrated control
system. The system monitors the safety devices and controls
the operation of the blower and venter motors and the gas valve
between heat cycles. It also controls the blower for cooling.
Ignition System Operating Sequence
– On a call for heat from the thermostat, the system energizes
the venter motor and goes through a 10-second prepurge. The
system verifies that the pressure switch, the high limit and the
flame rollout switch are in the closed state. The gas valve is then
energized and the ignition system provides the high voltage spark
to the electrode to ignite the main burner gas. Burner flame is
electronically sensed by the control upon carry over of flame. (A
separate solid metal probe is used as the flame sensing function.
A low voltage electrical signal is imposed on the metal probe that
is electrically isolated from ground. When the flame impinges
on the flame sensing probe, the flame acts as a conduction path
to ground. The flame rectifies and completes the DC circuit and
the ignition system acknowledges the flame.) The fan motor is
energized by the system after 30 seconds of flame sensing.
After the thermostat has been satisfied, the system de-energizes
the gas valve, the venter motor goes through a 45-second post-
purge and the fan motor remains energized for an additional
time.
NOTE: This is a three trial system. Should the
unit not sense burner ame, two additional
tries will be made. If the unit does not sense
ame in three tries, it will lockout for one hour
before initiating another 3-sequence trial for
ignition. To initiate another trial for ignition
before the one hour elapses requires that
either the thermostat be reset or the power
to the unit be interrupted for 30 seconds. The
user should not continue to try resetting the
system. Contact a qualied service agency.
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.
If a restriction causes the sensing pressure to be outside the
switch setpoint, the pressure switch will function to shut off the
main burner. The main burner will remain off until the system
has cooled and/or the resistance is reduced. The Table below
lists the approximate water column negative pressure readings
and switch setpoints for sea level operating conditions.
.
HEAT MODULE P/N 14208309 14208308 14208303
START-UP COLD 1.0 +/- .1 1.0 +/- .1 1.05 +/- .1
EQUILIBRIUM .72 +/- .05 .72 +/- .05 .8 +/- .05
SETPOINT “OFF” .55 .55 .55
SETPOINT “ON” .65 .65 .65
Limit Switch
All units are equipped with a temperature activated auto reset
limit control. The control is factory set and is non-adjustable.
If the setpoint is reached, the limit control acts to interrupt
the electric supply to the gas valve. This safety device provides
protection in the case of motor failure or lack of airflow due to a
restriction at the inlet or outlet.

Installation Guide for Comfort Pack (CPG) Units
20
Flame Rollout Switch
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-adjustable. 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.
Burner
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 flame rollout acts to interrupt the electric.
Gas Valve
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 flame rollout acts
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 1.
!WARNING
Start Up
Check Installation - Check the installation prior to
start-up:
1. Unit must be secure and level.
2. Verify proper clearances from combustibles.
3. Check vent and combustion air systems to be sure that they
are not blocked.
4. Check piping for leaks and proper gas line pressure. Bleed
gas lines of trapped air.
5. Check electrical wiring. Be sure all wire gauges are as
recommended. A service disconnect switch should be used.
Verify that fusing or circuit breakers are adequate for the
load use.
6. Verify that the return air duct connection is physically
sound, sealed to the unit cabinet and
terminates outside of the space containing the furnace.
7. Check that the vent connector is in place and is physically
sound without holes or
excessive corrosion.
8. Check that flue product carrying areas external to the
furnace are clear and free of obstructions.
9. Check that there are no obvious signs of deterioration of the
furnace.
10. Check that the physical support of the unit and furnace are
sound without sagging, cracks,
gaps, etc., around the base so as to provide a seal between
the support and the base
These examinations should be done by qualified service
personnel prior to initial start-up, and then at least on a yearly
basis..
Heater Start-Up
SAFETY WARNINGS
WARNINGS: FOR YOUR SAFETY, READ
BEFORE OPERATING. IF YOU DO
NOT FOLLOW THESE INSTRUCTIONS
EXACTLY, A FIRE OR EXPLOSION MAY
RESULT CAUSING PROPERTY DAMAGE,
PERSONAL INJURY OR LOSS OF LIFE.
• This appliance does not have a pilot. It is equipped with
an ignition device that automatically lights the burner.
Do not try to light the burner by hand.
• Before operating, smell all around the appliance area
for gas. Be sure to smell next to the floor because some
gas is heavier than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS?
(See next page)