Carrier 48PG20---28 - Manual (Page 11)

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7. Inspection of all supply--air and return--air ducts for leaks,
obstructions, and insulation integrity. Any problems found
should be resolved at this time.
8. Inspection of the unit base to ensure that no cracks, gaps,
etc., exist which may cause a hazardous condition.
9. Inspection of the unit casing for signs of deterioration.
10. Inspection of all electrical wiring and components to
assure proper connection.
11. Inspection for leaks in the refrigerant circuit.
Pressure--check to determine appropriate refrigerant charge
12. Operational check of the unit to determine working
conditions. Repair or adjustment should be made at this
time.
13. Your servicing dealer may offer an economical service
contract that covers seasonal inspections. Ask for further
details.
Complete Service Instructions can be found in the unit
Installation, Start--Up and Service Instructions.
BEFORE YOU CALL FOR SERVICE,
CHECK FOR SEVERAL EASILY SOLVED
PROBLEMS
If insufficient heating or 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:
( ) If using a thermostat, check to be sure that your thermostat
temperature selector is set above the indoor temperature during the
heating season, or below the indoor temperature during the cooling
season. Be sure the SYSTEM switch in the proper HEAT or COOL
position and not in the OFF position.
( ) If ComfortLink™ controls are used, check Scrolling Marquee
to be sure unit is not in SERVICE TEST mode. Check that set
points are properly configured. If alarm light is on, check what
alarms are active and/or notify the dealer.
( ) Is the electrical supply switch on? Are any fuses blown, or has
the circuit breaker tripped?
( ) During the heating season, check the manual gas shutoff valve.
Is this lever parallel with the pipe, indicating that the valve is open?
Or is the lever at the right angle, indicating that the valve is closed?
If closed, has the gas been shut off for safety reasons? Otherwise,
you may open the valve and follow the start--up procedures listed
in this manual.
NOTE: Before proceeding with the next check, turn off the
electrical power supply to the unit. Remove the control access
door.
( ) During the heating season, check the control dial on the gas
valve. Is it in the ON position? If it is not, be sure it has not been
turned off for the purpose of safety. If nothing else is incorrect,
follow the start--up procedures in this manual.
(
) 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, after performing the above, unit performance is unsatisfactory,
shut off the unit and call your dealer.
Dealer’s Name:
Telephone No.:
Unit Model:
Unit Serial Number:
HEATING & COOLING
TO OBTAIN INFORMATION ON PARTS: Consult your installing dealer or classified section of your local telephone directory under the
“Heating Equipment” or “Air Conditioning Contractors & Systems” heading for dealer listing by brand name.
Have available the Model No., Series Letter, & Serial No. of your equipment to ensure correct replacement part.
Printed in the U.S.A. Edition Date: 11/09
Catalog No: 48H---P---03SO
Replaces: 48H--- P--- 2SO Manufacturer reserves the right to change, at any time, specifications and design without notice and without obligation.
Copyright 2009 Carrier Corp., 7310 W. Morris St. Indianapolis, IN 46231