Carrier SINGLE-PACKAGED ELECTRIC COOLING UNITS 50SD Operating And Maintenance Manual

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A Guide To Operating and Maintaining Your
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.
!
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.
!
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.
TO START UNIT
Step 1 —Turn on the electrical power supply to unit.
Step 2 —Select temperature and set system switch to desired
mode.
TO SHUT UNIT OFF
If unit is being shut down because of a malfunction, call your
dealer as soon as possible.
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.
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).
Single-Packaged Electric Cooling Units
Single-Package Electric Cooling Unit
WARNING
WARNING
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 AND CUT HAZARD
Failure to follow this warning could result in personal in-
jury, death or property damage.
1. TURN OFF ELECTRICAL POWER TO YOUR UNIT
BEFORE SERVICING OR PERFORMING MAINTE-
NANCE.
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.
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).
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.
50SD