Carrier 50GS - Manual (Page 3)

Electrical Controls and Wiring
Electrical controls can not be checked without proper instrumen-
tations. If there are any discrepancies in the operating cycle,
contact your dealer and request service.
Refrigerant Circuit
The refrigerant circuit cannot be checked for leaks without the
proper equipment. If inadequate cooling is suspected, contact your
local dealer for service.
System under pressure. Relieve pressure and recover all
refrigerant before system repair or final unit disposal to avoid
serious injury or death. Use all service ports and open all
flow-control devices, including solenoid valves.
Unit Panels
After performing any maintenance or service on either of these
units, be sure all panels are fastened securely 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 heating
and cooling season, but at least every year) should include the
following:
1. Inspection and, if required, cleaning of the outdoor and indoor
coils.
2. Inspection and, if required, cleaning of the indoor coil drain
pan.
3. Inspection and cleaning of blower wheel housing and motor.
4. Inspection of all supply-air and return-air ducts for leaks,
obstructions, and insulation integrity. Any problems found
should be resolved at this time.
5. Inspection of the unit base to ensure that no cracks, gaps, etc.,
exist which may cause a hazardous condition.
6. Inspection of the unit casing for signs of deterioration.
7. Inspection of all electrical wiring and components to assure
proper connection.
8. Inspection for leaks in the refrigerant circuit. Pressure-check
to determine appropriate refrigerant charge.
9. Operational check of the unit to determine working condi-
tions. Repair or adjustment should be made at this time.
Your servicing dealer may offer an economical service contract
that covers seasonal inspections. Ask for further details.
Complete service instructions can be found in each unit’s Instal-
lation, Start-Up and Service Instructions.
BEFORE YOU CALL FOR SERVICE ...
...check for several easily-solved problems.
If insufficient 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.
If your unit is not operating at all, check the following list for
easy solutions:
( ) Check to be sure that your thermostat temperature selector is set
below the indoor temperature during the cooling season or above
the indoor temperature during heating season (if unit is installed
with optional electric heater). Be sure the SYSTEM switch or
MODE control is in the COOL or HEAT position and not in the
OFF position.
( ) 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.
IN CASE OF TROUBLE
If you perform the steps above and unit performance is still
unsatisfactory, shut off the unit and call your dealer.
Dealer’s Name ______________________________________
Telephone__________________________________________
Unit Model_________________________________________
Unit Serial Number___________________________________
Date of Installation___________________________________
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