Carrier 48TM028, 48TM020, 48TM025, 48TM016 User Manual
Heating/Cooling Units
User’s Information Manual
48TM016-028
Combination
NOTE TO INSTALLER
This manual should be left with the equipment owner.
WARNING: 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
flammable vapors and liquids in the
vicinity of this or any other appliance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch;
do not use any phone in your
building.
• Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire department.
— Installation and service must be per-
formed by a qualified installer, service
agency or the gas supplier.
TO LIGHT UNIT
1. Do not turn off the electrical power to unit without
first turning off the gas supply .
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 pilot on unit with
a match, lighter, or any other flame. If the electric
sparking device fails to light the pilot, refer to the
shutdown procedures, then call your dealer as soon as
possible.
If you do not follow these instructions exactly, a fire or
explosion may result, causing property damage, injury, or
loss of life.
See Fig. 1 for location of gas valves. Refer to Fig. 2 while
proceeding with the following steps.
Step 1 —
setting and set SYSTEM switch to HEA T position.
Step 2 —
Step 3 —
Step 4 —
Step 5 —
valve counterclockwise to the OFF position and wait
5 minutes.
Set room thermostat to the lowest temperature
Close the external manual gas valve.
Turn off the electrical supply to the unit.
Remove the burner compartment access panel.
Turn the control dial on the internal gas
Improper installation, adjustment, alteration, service or maintenance can cause injury or property
damage. Refer to this manual. For assistance or
additional information consult a qualified installer,
service agency, or the gas supplier.
Before performing recommended maintenance, be sure
main power switch to unit is turned off and lockout tag is
installed. Electrical shock could cause personal injury.
Your combin ation heating/cooling unit is equipped with an
automatic intermittent pilot and induced draft power combustion blower.
Pilot will light automatically. Do not attempt to light by
hand; personal injury may result.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Ta b 1 a 6 a
PC 111 Catalog No. 534-80112 Printed in U.S.A. Form 48TM-1SO Pg 1 5-02 Replaces: New
Step 6 —
wise to ON position.
Step 7 —
Step 8 —
Step 9 —
Step 10 —
room temperature to start unit. The induced-draft combustion
air fan will start. Main burners light within 30 seconds. Indoor
blower will start within a few minutes of main gas ignition.
Step 11 —
to desired setting.
Turn control dial on internal gas valve clock-
Replace the burner compartment access panel.
Turn on the electrical supply to unit.
Open the external gas valve.
Set room thermostat selector slightly above
Set the temperature selector on room thermostat
INDUCED DRAFT
MOTOR
INTEGRATED GAS
UNIT CONTROLLER
(HIDDEN)
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.
T o assure proper functioning of the unit, flow of combustion
and ventilating air must not be obstructed from reaching the
unit. Clearance of at least 4 ft on all sides is required.
ROUTINE MAINTENANCE AND CARE
FOR THE EQUIPMENT OWNER
Before proceeding with those things you might want to
maintain yourself, please carefully consider the following:
COMBUSTION
FAN HOUSING
MAIN BURNER
SECTION
FLUE BOX
COVER
MAIN GAS
VALV E
Fig. 1 — Typical Gas Heating Section
If the pilot fails to light, the main burner fails to light, or the
blower fails to come on, shut down gas heating section and
call your dealer for service. Failure to follow these requirements could result in serious personal injury.
TO SHUT UNIT OFF
Do not turn off the electrical power to unit w ithout first
turning off the gas supply .
Failure to follow these procedures can result in serious
fire or personal injury.
See Fig. 1 for location of gas valve. Refer to Fig. 3 while
proceeding with the following steps.
Step 1 —
and set SYSTEM switch to OFF position.
Step 2 —
Step 3 —
Step 4 —
Step 5 —
valve counterclockwise to the OFF position.
Step 6 —
Step 7 —
tion, call your dealer as soon as possible.
If unit is being shut down because the heating season has
ended, restore electrical power to the uni t 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.
Set room ther m ostat to lowe st te m p e rature setting
Close the external manual gas valve.
Turn off the electrical power supply to the unit.
Remove the burner compartment access panel.
Turn the control dial on the internal gas
Replace the burner compartment access panel.
If unit is being shut down because of a malfunc-
1. TURN OFF GAS SUPPLY AND ELECTRICAL
POWER TO YOUR UNIT BEFORE SERVICING
OR PERFORMING MAINTENANCE.
2. Do not turn off electrical power to this unit without
first turning off the 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.
Air Filters —
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. Remove the filter access p a n e l t o r e p la c e o r in s p ec t th e f ilters. All
units have filter tracks into which the filters sl ide. Remove t he
filters by pulling outward from the track. See Fig. 4 for filter
access panel location. Note the direction of flow arrows on the
filter frame.
For horizontal supply/return units, the size, location and
number of air filters varies from Table 1. 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 a cleanable filter for
the outdoor air. This filter should be checked annually and
cleaned as necessary. Remove by removing screws in outdoor
air filter retainer and sliding filters out of the unit.
Never operate your unit without filters in place. Failure t o
heed this warning may result in damage to the blower
motor and/or compressor. An accumulation of dust and lint
on internal parts of your unit can cause loss of efficiency
and in some cases, fire.
Table 1 — Indoor-Air Filter Data*
UNIT SIZE
48TM
016-028†
*When replacing filters, always use the same type and size origi-
nally supplied.
†The 48TM028 unit requires 2-in. industrial grade filters capable of
handling face velocities of up to 625 ft/min (such as American Air
Filter no. 5700 or equivalent).
TYPE OF
FILTER
Fiberglass
Throwaway
QUANTITY...SIZE (in.)
4...20 x 20 x 2
4...16 x 20 x 2
2
STEP 1
STEP 2
STEP 4 STEP 5
STEP 3
STEP 8
STEP 6
STEP 9
Fig. 2 — To Light Unit
3
STEP 7
STEP 10
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