Carrier SINGLE-PACKAGED ELECTRIC COOLING UNITS 50SD - Manual (Page 3)

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9. Operational check of the unit to determine working
conditions. 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 maintenance instructions can be found in the unit
Installation, Start-Up and Service Instructions.
WARRANTY CERTIFICATES
Unit 50SD has limited warranties. Certificates are located at
the back of this book. Be sure to read the warranty carefully to
determine the coverage for your unit.
BEFORE YOUR CALL FOR SERVICE, CHECK FOR SEVERAL
EASLILY-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:
( ) Check to be sure that your thermostat temperature selector
is set below the indoor temperature during the cooling season.
Be sure the system switch is in the COOL 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 after performing the above and unit performance is still
unsatisfactory, shut off the unit and call your dealer.
Dealer’s Name
Telephone
Unit Model
Unit Serial Number