48HG014---028, 48HJ020---028
48PG20---28, 48PM020---028
Gas Heating/Electric Cooling Unit
User’s Information Manual
NOTE TO INSTALLER:
This manual should be left with the equipment owner.
SAFETY CONSIDERATIONS
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components. Only
trained and qualified service personnel should install, repair, or
service air-conditioning equipment.
Untrained personnel can perform the basic maintenance functions
of replacing filters. All other operations should be performed by
trained service personnel. When working on air-conditioning
equipment, observe precautions in the literature, tags and labels
attached to the unit, and other safety precautions that may apply.
Follow all safety codes. Wear safety glasses and work gloves. Use
quenching cloth for unbrazing operations. Have fire extinguishers
available for all brazing operations.
.
Recognize safety information. This is the safety--alert symbol
When you see this symbol on the furnace and in instructions or
manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety--alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies a hazard
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which may result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability, or
operation.
!
WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
1. 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 unit for more details.
2. Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
appliance.
What to do if you smell gas:
1. DO NOT try to light any appliance.
2. DO NOT touch any electrical switch, or use any
phone in your building.
3. IMMEDIATELY call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
4. If you cannot reach your gas supplier, call the fire
department.
WARNING
!
PERSONAL INJURY, DEATH
PROPERTY DAMAGE HAZARD
AND
/
OR
Failure to follow this warning could result in personal
injury, death or property damage.
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical
shock, or other conditions which may cause personal
injury or property damage. Consult a qualified installer,
service agency, or your distributor or branch for
information or assistance. The qualified installer or
service agency must use factory--authorized kits or
accessories when modifying this product.
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before performing recommended maintenance, be sure
main power switch to unit is turned off and lockout tag is
installed.
Your combination heating/cooling unit is equipped with direct
spark ignition and induced draft power combustion blower.
!
WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death and/or property damage.
Burners will light automatically. Do not attempt to light by
hand.
TO LIGHT UNIT
(UNITS WITH THERMOSTAT CONTROL)
!
DANGER
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury
or death.
1. Do not turn off the electrical power to unit without first
turning off the gas supply.
COMBUSTION
FAN HOUSING
2. Before attempting to start the gas heating section, familiarize
yourself with all the procedures that must be followed.
HEAT
EXCHANGER
SECTION
3. Never attempt to manually light the burners on the unit with
a match, lighter, or any other flame. If the electric sparking
device fails to light the burners, refer to the shutdown
procedures, then call your dealer as soon as possible.
IGC BOARD
(HIDDEN)
INDUCED
DRAFT
MOTOR
MAIN GAS
VALVE
MAIN BURNER
SECTION
See Fig. 1 for location of gas valve. Refer to Fig. 2 while
proceeding with the following steps.
C07259
Fig. 1 -- Typical Gas Heating Section
Step 1 — Set room thermostat to the lowest temperature setting
and set SYSTEM switch to OFF position.
!
Step 2 — Close the external gas pipings manual shut off valve
WARNING
located outside the unit.
FIRE, EXPLOSION HAZARD
Step 3 — Turn off the electrical supply to the unit and
Failure to follow this warning could result in personal injury,
death, and/or property damage.
install lockout tag.
If the main burners fail to light, or the blower fails to come on,
shut down gas heating section and call your dealer for service.
Step 4 — Remove the heat section access panel.
Step 5 — Turn the Off/On selector switch on the gas valve to
the OFF position and wait 5 minutes.
TO LIGHT UNIT
(UNITS WITH COMFORTLINK™
CONTROL)
Step 6 — Move the Off/On selector switch on the gas valve to
the ON position.
Step 7 — Replace the heat section access panel.
Step 8 — Remove lockout tag and turn on the electrical supply
!
to unit.
Step 9 — Open the external gas pipings manual shut off valve
located outside the unit.
DANGER
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Step 10 — Set room thermostat temperature selector slightly
1. Do not turn off the electrical power to unit without first
turning off the gas supply.
above room temperature and set system switch to HEAT position
to start the unit. The induced--draft combustion air fan will start.
Main burners light within 30 seconds. Indoor blower will start
within a few seconds of main gas ignition.
2. Before attempting to start the gas heating section, familiarize
yourself with all the procedures that must be followed.
3. Never attempt to manually light the burners on the unit with
a match, lighter, or any other flame. If the electric sparking
device fails to light the burners, refer to the shutdown
procedures, then call your dealer as soon as possible.
Step 11 — Set the temperature selector on room thermostat to
desired setting.
2
MAIN
ON
OFF
STEP 1
STEP 2
LOCK-OUT
TAG
STEP 3
CONTROL I.D.
LABEL
STEP 4
STEP 7
ON
1/4˝ X .032˝ MALE SPADE
TERMINALS (2) COMMON
SWITCH (SHIPPED IN
“ON” POSITION)
OFF
ON
OFF
SWITCH (SHIPPED IN
“ON” POSITION)
CONTROL I.D.
LABEL
1/4˝ X .032˝ MALE SPADE
TERMINALS (2) COMMON
STEP 6
STEP 5
STEP 8
STEP 9
STEP 10
C07339
Fig. 2 -- To Light Unit
3
MAIN
MODE
ON
Run Status
Service Test
Temperature
Pressures
Setpoints
Inputs
Alarm Status
Outputs
Configuration
Time Clock
ESCAPE
ENTER
Operating Modes
Alarms
OFF
STEP 1
STEP 2
LOCK-OUT
TAG
STEP 3
STEP 4
STEP 6
STEP 5
STEP 7
STEP 9
STEP 8
MODE
Run Status
Service Test
Temperature
Pressures
Setpoints
Inputs
Alarm Status
Outputs
Configuration
Time Clock
ESCAPE
ENTER
Operating Modes
Alarms
STEP 10
C07349
Fig. 3 -- To Light Unit (Units with ComfortLinkt Control)
4
TO LIGHT UNIT (UNITS WITH
COMFORTLINK™ CONTROL)
(CONTINUED)
!
FIRE, EXPLOSION HAZARD
See Fig. 1 for location of gas valve. Refer to Fig. 3 while
proceeding with the following steps.
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Step 1 — Turn off the unit demand for cooling or heating by
using the Scrolling Marquee. The Scrolling Marquee is located in
the control box at the compressor end of the unit.
a. Push the ESCAPE key until a blank display screen is
shown.
b. Push the DOWN arrow key until the SERVICE TEST
LED is lit.
c. Push the ENTER key. The display will show STOP.
d. Push the ENTER key again. The NO/YES display will
flash.
e. Push the UP or DOWN key to toggle the display to
YES and then push ENTER. The unit will be locked off
from heat, cooling or any operation. The controls will
still function and the display will still operate.
If the main burners fail to light, or the blower fails to come on,
shut down gas heating section and call your dealer for service.
TO SHUT UNIT OFF
(UNITS WITH THERMOSTAT CONTROL)
!
Step 3 — Turn off the electrical supply to the unit and
install lockout tag.
Step 4 — Remove the heat section access panel.
Step 5 — Turn the Off/On selector switch on the gas valve to
WARNING
FIRE HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Do not turn off the electrical power to unit without first turning
off the gas supply.
Step 2 — Close the external gas pipings manual shut off valve
located outside the unit.
WARNING
See Fig. 1 for location of gas valve. Refer to Fig. 4 while
proceeding with the following steps.
Step 1 — Set room thermostat to lowest temperature setting and
set SYSTEM switch to OFF position.
the OFF position and wait 5 minutes.
Step 2 — Close the external gas pipings manual shut off valve
located outside the unit.
Step 6 — Move the Off/On selector switch on the gas valve to
the ON position.
Step 3 — Turn off the electrical power supply to the unit and
install lockout tag.
Step 7 — Replace the heat section access panel.
Step 8 — Remove lockout tag and turn on the electrical supply
Step 4 — Remove the heat section access panel.
Step 5 — Turn the control dial on the main gas valve
to unit.
counterclockwise to the OFF position.
Step 9 — Open the external gas pipings manual shut off valve
located outside the unit.
Step 6 — Replace the heat section access panel.
Step 7 — If unit is being shut down because of a malfunction,
Step 10 — Using the Scrolling Marquee, enable the unit to run
call your dealer as soon as possible.
using the following procedure:
If unit is being shut down because the heating season has ended,
restore electrical power to the unit to ensure operation of the
cooling system during the cooling season.
Should overheating occur, or the gas supply fail to shut off, shut
off the manual gas valve to the unit before shutting off the
electrical supply.
Do not use this unit if any part has been under water. Immediately
call a qualified service technician to inspect the unit and to replace
any part of the control system and any gas control which has been
under water.
a. Push the ESCAPE key until a blank display screen is
shown.
b. Push the DOWN key until the SERVICE TEST LED is
lit.
c. Push the ENTER key. The display will show STOP.
d. Push the ENTER key again. The NO/YES display will
flash.
e. Push the UP or DOWN key to toggle the display to NO
and then push ENTER. The unit will return to normal
operation and exit SERVICE TEST mode.
TO SHUT UNIT OFF
(UNITS WITH COMFORTLINK™
CONTROL)
Step 11 — To test the operation of the gas section, use the
Scrolling Marquee test routine to energize the gas outputs and to
turn on the gas.
!
Step 12 — For normal operation, make sure that the set points
are at the normal heat set points.
WARNING
FIRE HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Do not turn off the electrical power to unit without first turning
off the gas supply.
See Fig. 1 for location of gas valve. Refer to Fig. 5 while
proceeding with the following steps.
5
MAIN
ON
OFF
STEP 1
STEP 2
LOCK-OUT
TAG
STEP 3
STEP 4
STEP 5
STEP 6
STEP 7
C07350
Fig. 4 -- To Shut Unit Off
Step 1 — Turn off the unit demand for cooling or heating by
Step 2 — Close the external gas pipings manual shut off valve
using the Scrolling Marquee. The Scrolling Marquee is located in
the control box at the compressor end of the unit.
located outside the unit.
a. Push the ESCAPE key until a blank display screen is
shown.
b. Push the DOWN arrow key until the SERVICE TEST
LED is lit.
c. Push the ENTER key. The display will show STOP.
d. Push the ENTER key again. The NO/YES display will
flash.
e. Push the UP or DOWN key to toggle the display to
YES and then push ENTER. The unit will be locked off
from heat, cooling or any operation. The controls will
still function and the display will still operate.
Step 3 — Turn off the electrical power supply to the unit and
install lockout tag.
Step 4 — Remove the heat section access panel.
Step 5 — Turn the control dial on the main gas valve
counterclockwise to the OFF position.
Step 6 — Replace the heat section access panel.
Step 7 — If unit is being shut down because of a malfunction,
call your dealer as soon as possible.
6
MAIN
MODE
ON
Run Status
Service Test
Temperature
Pressures
Setpoints
Inputs
Alarm Status
Outputs
Configuration
Time Clock
ESCAPE
ENTER
Operating Modes
Alarms
OFF
STEP 1
STEP 2
LOCK-OUT
TAG
STEP 3
STEP 4
STEP 5
STEP 7
STEP 6
C07351
Fig. 5 -- To Shut Unit Off (Units with ComfortLinkt Control)
If unit is being shut down because the heating season has ended,
restore electrical power to the unit and take control out of Service
Test mode to ensure operation of the cooling system during the
cooling season.
Should overheating occur, or the gas supply fail to shut off, shut
off the manual gas valve to the unit before shutting off the
electrical supply.
Do not use this unit if any part has been under water. Immediately
call a qualified service technician to inspect the unit and to replace
any part of the control system and any gas control which has been
under water.
MAINTAINING YOUR UNIT
All maintenance should be handled by skilled, experienced
personnel. Your dealer can help you establish a standard
procedure.
For your safety, keep the area around the unit clear and free of
combustible materials, gasoline and other flammable liquids and
vapors.
To assure proper functioning of the unit, flow of combustion and
ventilating air must not be obstructed from reaching the unit.
Clearance of at least 6 ft on all sides is required.
7
ROUTINE MAINTENANCE AND CARE
FOR THE EQUIPMENT OWNER
Before proceeding with those things you might want to maintain
yourself, please carefully consider the following:
!
WARNING
FIRE, EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
1.Turn off gas supply and electrical power to your unit before
servicing or performing maintenance.
PULL OUT CENTER OF
HOOD TO RELEASE OUTDOOR AIR
FILTER FROM TRACK
2. Do not turn off electrical power to this unit without first
turning off gas supply.
3. When removing access doors or performing maintenance
functions inside your unit, be aware of sharp sheet metal
parts and screws. Although special care has been taken to
reduce sharp edges to a minimum, be extremely careful
when handling parts or reaching into the unit.
CONTROL BOX
ACCESS DOOR
INDOOR MOTOR
ACCESS DOOR
Air Filter(s)
Air filters should be checked at least every 3 or 4 weeks and
changed or cleaned whenever they become dirty. Table 1 indicates
the correct filter size for your unit. Open the filter access panel to
replace or inspect the filters. All units have filter tracks into which
the filters slide. Remove the filters by pulling the filter slide
outward from the track. See Fig. 6 for filter access panel location.
Note the direction of flow arrows on the filter frame.
If you have difficulty in locating your air filter in the return--air
duct system, or if you have questions concerning proper filter
maintenance, contact your dealer for instructions. When replacing
your unit filters, always use the same size and type of filter that was
originally supplied by the installer.
Units with outdoor air capability have cleanable filters for the
outdoor air. These filters should be checked quarterly and cleaned
as necessary. Remove by pulling out the middle of the hood top.
Push up on the center filter and then remove. Slide the other filters
to the center and repeat.
!
WARNING
FIRE AND EQUIPMENT DAMAGE HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
Never operate unit without filters in place. Damage to blower
motor and/or compressors could result. An accumulation of
dust and lint on internal parts of your unit can cause loss of
efficiency and in some cases, fire.
FILTER
ACCESS
DOOR
HEAT
SECTION
ACCESS
PANEL
GAS VALVE
CONNECTION
C07352
Fig. 6 -- Panel and Filter Locations
Heat Exchanger
To ensure dependable and efficient heating operation, the heat
exchanger should be checked by a qualified maintenance person
before each heating season, and cleaned when necessary. This
checkout should not be attempted by anyone not having the
required expertise and equipment to do the job properly. Checking
and/or cleaning the heat exchanger involves removing the gas
controls assembly and the flue collector box cover and, when
completed, reinstalling the gas controls assembly for proper
operation. The flue collector box cover must be replaced and sealed
correctly using high temperature “red” RTV. Contact your dealer
for the required periodic maintenance.
Fans and Belts
Check quarterly the condition of fan wheels and housings, and belt
tension. When service is necessary, call your dealer.
Table 1 – Indoor Air Filter Data
UNIT
48HG,HJ,
PG, PM
014- 024,
20-24
28, 028
TYPE OF FILTER
Standard Throwaway, Optional
30%, or Accessory 65% Pleated
Standard Throwaway, Optional
30%, or Accessory 65% Pleated
QUANTITY...SIZE
(in.)
9...16 x 25 x 2
9...20 x 25 x 2
Evaporator, Condenser, and Combustion Fan
Motors
Lubrication is not recommended. Bearings will not require
lubrication for at least 5 years of normal operation. After 5 years,
motor life can be extended by having the motors serviced at an
authorized motor service shop.
8
Fan Shaft Bearings
1. Turn off electrical power (install disconnect tag) and gas
supply to your unit.
2. Remove burner compartment access panel.
3. Using a flashlight, carefully inspect the burner areas for dirt,
soot, or scale.
Lubrication should only be done by qualified service personnel.
Contact your dealer for the required annual maintenance.
Evaporator and Condenser Coils
Cleaning of the coils should only be done by qualified service
personnel. This procedure should be performed prior to cooling
operation or more frequently should conditions require. Contact
your dealer for the required annual maintenance.
!
CAUTION
Condensate Drain
EQUIPMENT DAMAGE HAZARD
The drain pan and condensate drain line should be checked and
cleaned at the same time the cooling coils are checked by your
dealer.
If dirt, soot, rust or scale accumulations are found, call your
dealer and do not operate your heating section.
Failure to follow this caution may result in damage to unit.
Compressors
4. When you have completed your inspection, follow the
start--up procedures in this manual to restore your unit to
operation.
5. Observe unit heating operation, and watch the burner flame
with the access panel removed to see if it is bright blue. If
you observe a suspected malfunction, or that the burner
flames are not bright blue, call your dealer. (See Fig. 7.)
Some yellow flame may be present due to the panel being
removed.
6. Replace burner compartment access panel.
All compressors are factory shipped with a normal charge of the
correct type refrigerant grade oil in them and should rarely require
additional oil. Unless the refrigerant system has been opened or a
compressor is replaced, there will not be a need to verify oil level.
Condenser Fan
!
WARNING
PERSONAL INJURY HAZARD
Failure to follow this warning could result in personal injury
or death.
Do not poke sticks, screwdrivers, or other object into
revolving fan blades.
The fan must be kept free of all obstructions to ensure proper
cooling. Contact your dealer for any required service.
C07353
Electrical Controls and Wiring
Electrical controls are difficult to check without proper
instrumentation; therefore, if there are any discrepancies in the
operating cycle, contact your dealer and request service.
Integrated Gas Controller (IGC)
The IGC board incorporates an LED that emits a flashing light to
indicate an alarm code. If the furnace section will not operate and
the LED is flashing a code (1 to 9 flashes in succession), contact
your dealer and request service. (See Fig. 1.) Removing power to
the unit will erase the IGC fault codes.
Refrigerant Circuits
The refrigerant circuits are difficult to check for leaks without the
proper equipment; therefore, if inadequate cooling is suspected,
contact your dealer for service.
Combustion Area and Vent System
The combustion area and vent system should be visually inspected
before each heating season. The normal accumulation of dirt, soot,
rust, and scale can result in loss of efficiency and improper
performance if allowed to build up.
!
WARNING
FIRE HAZARD
Failure to follow this warning could result in personal injury,
death, and/or property damage.
If your unit makes and especially loud noise when the main
burners are ignited, shut down the heating section and call
your dealer.
See Fig. 1 and proceed as follows to inspect the combustion area
and power--venting system of your unit.
Fig. 7 -- Proper Flame Appearance
Unit Panels
After performing any maintenance or service on the unit, be sure
all panels are securely fastened in place to prevent rain from
entering unit cabinet and to prevent disruption of the correct unit
airflow pattern.
REGULAR DEALER MAINTENANCE
In addition to the type of routine maintenance you might be willing
to perform, your unit should be inspected regularly by a properly
trained service technician. An inspection (preferably each year, but
at least every other year) should include the following:
1. Inspection of all flue product passages -- including the
burners, combustion baffles, heat exchanger, flue collector
box, and vent pipe.
2. Inspection of all combustion--air and ventilation--air
passages and openings.
3. Close inspection of all gas pipes leading to and inside your
unit.
4. Inspection, and if required, cleaning of the condenser and
evaporator coils.
5. Inspection, and if required, cleaning of the evaporator drain
pan.
6. Inspection, cleaning, and lubrication of blower wheel
housing and motor.
7. Inspection of all supply--air and return--air ducts for leaks,
obstructions, and insulation integrity. Any problems found
should be resolved at this time.
8. Inspection of the unit base to ensure that no cracks, gaps,
etc., exist which may cause a hazardous condition.
9. Inspection of the unit casing for signs of deterioration.
9
10. Inspection of all electrical wiring and components to
assure proper connection.
11. Inspection for leaks in the refrigerant circuit.
Pressure--check to determine appropriate refrigerant charge
12. Operational check of the unit to determine working
conditions. Repair or adjustment should be made at this
time.
13. Your servicing dealer may offer an economical service
contract that covers seasonal inspections. Ask for further
details.
Complete Service Instructions can be found in the unit
Installation, Start--Up and Service Instructions.
( ) Is the electrical supply switch on? Are any fuses blown, or has
the circuit breaker tripped?
( ) During the heating season, check the manual gas shutoff valve.
Is this lever parallel with the pipe, indicating that the valve is open?
Or is the lever at the right angle, indicating that the valve is closed?
If closed, has the gas been shut off for safety reasons? Otherwise,
you may open the valve and follow the start--up procedures listed
in this manual.
NOTE: Before proceeding with the next check, turn off the
electrical power supply to the unit. Remove the control access
door.
( ) During the heating season, check the control dial on the gas
valve. Is it in the ON position? If it is not, be sure it has not been
turned off for the purpose of safety. If nothing else is incorrect,
follow the start--up procedures in this manual.
( ) If your unit still fails to operate, call your servicing dealer for
troubleshooting and repairs. Specify the model and serial numbers
of your unit. (Record them in this manual in the space provided.) If
the dealer knows exactly which unit you have, he may be able to
offer suggestions over the phone, or save valuable time through
knowledgeable preparation for the service call.
BEFORE YOU CALL FOR SERVICE,
CHECK FOR SEVERAL EASILY SOLVED
PROBLEMS
If insufficient heating or cooling is suspected:
( )Check for sufficient airflow. Check the air filter for dirt. Check
for blocked return--air or supply--air grilles. Be sure they are open
and unobstructed. If these checks do not reveal the cause, call your
servicing dealer.
IN CASE OF TROUBLE
If your unit is not operating at all, check the
following list for easy solutions:
If, after performing the above, unit performance is unsatisfactory,
shut off the unit and call your dealer.
Dealer’s Name:
Telephone No.:
Unit Model:
Unit Serial Number:
( ) If using a thermostat, check to be sure that your thermostat
temperature selector is set above the indoor temperature during the
heating season, or below the indoor temperature during the cooling
season. Be sure the SYSTEM switch in the proper HEAT or COOL
position and not in the OFF position.
( ) If ComfortLink™ controls are used, check Scrolling Marquee
to be sure unit is not in SERVICE TEST mode. Check that set
points are properly configured.
HEATING & COOLING
TO OBTAIN INFORMATION ON PARTS: Consult your installing dealer or classified section of your local telephone directory under the
“Heating Equipment” or “Air Conditioning Contractors & Systems” heading for dealer listing by brand name.
Have available the Model No., Series Letter, & Serial No. of your equipment to ensure correct replacement part.
Copyright 2007 Carrier Corp., 7310 W. Morris St. Indianapolis, IN 46231
Printed in the U.S.A.
Edition Date: 11/07
Manufactuer reserves the right to change, at any time, specifications and design without notice and without obligation.
10
Catalog No: 48H ---P---2SO
Replaces: 48H,P--- 1SO