Carrier COMFORTLINK 48A3 - Manual (Page 4)

4
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