50SD
Single-Packaged Electric Cooling Units
A Guide To Operating and MaintainingYour
Single-Package Electric Cooling Unit
NOTE TO INSTALLER
This manual must be left with the equipment owner.
Note to User: Please read all manuals and retain manuals for
future reference.
FOR YOUR SAFETY
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or any other appliance.
!
WARNING
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
Do not use this unit if any part has been under water.
Immediately call a qualified service technician to inspect
the unit and to replace any part of the control system which
has been under water.
Fig. 1—Unit 50SD
MAINTENANCE AND CARE FOR THE
EQUIPMENT OWNER
Before proceeding with those things you might want to
maintain yourself, please carefully consider the following:
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury, death.
Before performing recommended maintenance, be sure
the main power switch to unit is turned off.
!
WARNING
ELECTRICAL SHOCK AND CUT HAZARD
TO START UNIT
Step 1—Turn on the electrical power supply to unit.
Failure to follow this warning could result in personal in-
jury, death or property damage.
Step 2—Select temperature and set system switch to desired
mode.
1. TURN OFF ELECTRICAL POWER TOYOUR UNIT
BEFORE SERVICING OR PERFORMING MAINTE-
NANCE.
TO SHUT UNIT OFF
If unit is being shut down because of a malfunction, call your
dealer as soon as possible.
2. When removing access panels or performing mainte-
nance functions inside your unit, be aware of sharp sheet
metal parts and screws.Although special care is taken to
reduce sharp edges to a minimum, be extremely careful
when handling parts or reaching into the unit.
Step 1—Set temperature switch to OFF.
Step 2—Turn off the electrical power supply to unit.
ROUTINE MAINTENANCE
All routine maintenance should be handled by skilled,
experienced personnel. Your dealer can help you establish a
standard procedure.
AIR FILTERS— Air filter(s) should be checked at least every
3 or 4 weeks and changed or cleaned whenever it becomes
dirty. Dirty filters produce excessive stress on the blower motor
and can cause the motor to overheat and shut down. Table 1
indicates the correct filter size for your unit. Refer to Fig 2 to
access the filter(s).
For your safety, keep the unit area clear and free of combustible
materials, gasoline, and other flammable liquids and vapors.
To assure proper functioning of the unit, flow of condenser air
must not be obstructed from reaching the unit. Clearance from
the top of the unit is 48 in. Clearance of at least 36 in. is
required on sides except the power entry side (42 in. clearance)
and the duct side (12 in. minimum clearance).
To replace or inspect filter(s) (or accessory filter rack when
supplied):
1. Remove the filter access panel using a 5/16-in. nut driver.
9. Operational check of the unit to determine working
conditions. Repair or adjustment should be made at this
time.
( ) 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.
Your servicing dealer may offer an economical service
contract that covers seasonal inspections. Ask for further
details.
( ) 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.
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.
IN CASE OF TROUBLE
If after performing the above and unit performance is still
unsatisfactory, shut off the unit and call your dealer.
BEFOREYOUR CALL FOR SERVICE, CHECK FOR SEVERAL
EASLILY-SOLVED PROBLEMS
If insufficient heating or cooling is suspected:
Dealer’s Name
Telephone
( ) 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.
Unit Model
If your unit is not operating at all, check the following list for
easy solutions:
Unit Serial Number
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Copyright 2005 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
4
PC 101
Page 4
Form/Catalog No. OM50-42
Printed in U.S.A.
8-05
Replaces: New
Tab 1b 1a
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