Carrier COMFORTLINK 48A2 User's Manual | Page 4

Carrier Air Compressor User's Manual - COMFORTLINK 48A2.
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6. Move the switch on the gas valve to the ON position.
7. Replace the gas section access panels.
8. Turn on the electrical supply to the units.
9. Open the field-installed manual gas valve.

10. Using the scrolling marquee, enable the unit to run using

the following procedure:

a. Push the 

 key unit a blank display screen

is shown.

b. Push the 

 key until the SERVICE TEST LED is

lit.

c. Push the 

 key. The display will show

STOP.

d. Push the 

 key again. The NO/YES display

will flash.

e. Push  the 

 or 

 key  to  toggle  the  display  to

NO and then push 

. The unit will return to

normal operation and exit Service Test mode.

11. To test the operation of the gas section, use the scrolling

marquee Service Test routine to energize the gas outputs

and to turn on the gas. Refer to unit Controls, Start-Up,

Operation, Service and Troubleshooting literature for

more information.

12. For normal operation, make sure that units with a conven-

tional thermostat are set to heating control temperature.

On VAV (variable air volume) and CV (constant volume)

units with a space temperature sensor, make sure that the

set points are at the normal heat set points.

TO SHUT UNIT OFF

Refer to Fig. 4 while performing the following steps:

1. Disable unit operation by using the scrolling marquee.

The scrolling marquee is located in the control box at the

compressor end of the unit.

a. Push the 

 key unit a blank display screen

is shown.

b. Push the 

 key until the SERVICE TEST LED is

lit.

c. Push the 

 key. The display will show

STOP.
NOTE: Items in the configuration and Service Test

modes are password protected. The display will

flash PASS and WORD when required. Use the

 and arrow keys to enter the 4 digits of the

password. The default password is 1111.

d. Push the 

 key again. The NO/YES display

will flash.

e. Push the 

 or 

 key to toggle the display to

YES and then push 

. The unit will be

locked off from heating, cooling or any operation.

The controls will still function and the display will

still operate.

2. Close the field-installed manual gas shutoff valve.
3. Turn off the electrical power to the unit using the optional

disconnect or the field-installed disconnect and lock off

using proper lockout and tag-out procedures.

4. Remove the gas section panels.
5. Move the switch on the gas valve to the OFF position and

wait 5 minutes before doing any service in the section or

on the piping.

6. Replace gas section access panels.

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 and reset the

scrolling marquee to Run mode to ensure operation of the

cooling system during the cooling season.

Do not use this unit if any part has been under water. Imme-

diately call a qualified service technician to inspect the unit and

to replace any part of the control system and gas control that

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 ensure proper functioning of the unit, the flow of com-

bustion and ventilating air must not be obstructed from reach-

ing the unit. Clearance of at least 4 ft on flue and condenser

sides and 6 in. on all other sides is required.

ROUTINE MAINTENANCE AND CARE

FOR THE EQUIPMENT OWNER

Consider the following information before maintaining or

servicing equipment:

WARNING

If the main burners fail to light or the blower fails to start,

shut down gas heating section and call your dealer for ser-

vice. Failure to follow these requirements could result in

serious personal injury.

WARNING

1. Do not turn off the electrical power to unit without

first turning off the gas supply.

2. Never attempt to manually light the main burners on

unit with a match, lighter, or any other flame. If the

electric sparking device fails to light the main burners,

refer to the following shutdown procedures. Call your

dealer as soon as possible.

Failure to follow these procedures can result in serious

fire or personal injury.

ESCAPE

ENTER

ENTER

ENTER

ESCAPE

ENTER

IMPORTANT: 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.

WARNING

1. TURN OFF GAS SUPPLY AND THEN ELECTRI-

CAL POWER TO YOUR UNIT BEFORE SERVIC-

ING OR PERFORMING MAINTENANCE.

2. Do not turn off electrical power to this unit without

first turning off the gas supply.

3. When removing access panels or performing mainte-

nance functions inside your unit, be aware of sharp

sheet metal parts and screws. Although special care

has been taken to reduce sharp edges inside the unit,

be extremely careful when handling parts or reaching

into the unit.

Failure to follow these procedures can result in serious

fire or personal injury.

ENTER

ENTER

ENTER

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