Carrier 48TM028, 48TM020, 48TM025, 48TM016 User Manual

48TM016-028 Combination Heating/Cooling Units

User’s Information Manual

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 performed 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 — Set room thermostat to the lowest temperature setting and set SYSTEM switch to HEAT position.

Step 2 — Close the external manual gas valve.

Step 3 — Turn off the electrical supply to the unit.

Step 4 — Remove the burner compartment access panel.

Step 5 — 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 combination 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.

valve counterclockwise	to the OFF position and wait
5 minutes.

Step 6 — Turn control dial on internal gas valve clockwise to ON position.

Step 7 — Replace the burner compartment access panel.

Step 8 — Turn on the electrical supply to unit.

Step 9 — Open the external gas valve.

Step 10 — Set room thermostat selector slightly above 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 — Set the temperature selector on room thermostat to desired setting.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book	1	4	PC 111	Catalog No. 534-80112	Printed in U.S.A.	Form 48TM-1SO	Pg 1	5-02	Replaces: New
Tab	1a	6a

INDUCED DRAFT

INTEGRATED GAS

MOTOR

UNIT CONTROLLER

(HIDDEN)

COMBUSTION	MAIN BURNER	FLUE BOX	MAIN GAS
FAN HOUSING	SECTION	COVER	VALVE

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 without 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 — Set room thermostat to lowest temperature setting and set SYSTEM switch to OFF position.

Step 2 — Close the external manual gas valve.

Step 3 — Turn off the electrical power supply to the unit.

Step 4 — Remove the burner compartment access panel.

Step 5 — Turn the control dial on the internal gas valve counterclockwise to the OFF position.

Step 6 — Replace the burner compartment access panel.

Step 7 — If unit is being shut down because of a malfunction, call your dealer as soon as possible.

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.

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 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:

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 panel to replace or inspect the filters. All units have filter tracks into which the filters slide. Remove the 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 to 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	TYPE OF	QUANTITY...SIZE (in.)
	48TM	FILTER
	016-028†	Fiberglass	4...20 x 20 x 2
		Throwaway	4...16 x 20 x 2

*When replacing filters, always use the same type and size originally 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).

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STEP 1	STEP 2	STEP 3

STEP 4

STEP 5

STEP 6

STEP 7

STEP 8

STEP 9

STEP 10

Fig. 2 — To Light Unit

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