Carrier SINGLE PACKAGED ELECTRIC COOLING UNITS 50GS Assembly Instructions

50GS
Single-Packaged
50Hz Electric Cooling Units
A Guide to Operating and Maintaining Your
Single-Packaged Electric Cooling Units
NOTE: Read the entire instruction manual before starting the
installation. SAFETY CONSIDERATIONS
Note to Installer:This manual should be left with the equipment
user.
Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of these or any other appliances. Failure
to follow this warning could result in fire, serious injury, or
death.
Do not use either of these units 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. Failure to follow this warning
could result in electrical shock, fire, serious injury, or death.
Before performing recommended maintenance, be sure the
main power switch to unit is turned off and lock-out tag
installed. Electric shock could cause serious injury or death.
STARTING OR SHUTTING UNIT OFF
1. To start this unit:
a. Turn on the electrical power supply to unit.
b. Select temperature and set SYSTEM switch or MODE
control to desired mode.
2. To shut this unit off:
NOTE: If the unit is being shut down because of a malfunction,
call your dealer as soon as possible.
a. Set system SWITCH or MODE control to OFF.
b. Turn off the electrical power supply to unit and install
lock-out tag.
OPERATING YOUR ELECTRIC AIR CONDITIONER
The operation of your system is controlled by the indoor thermo-
stat. You simply adjust the thermostat and it maintains the indoor
temperature at the level you select. Most thermostats have 3
controls: a temperature control selector, a FAN control, and a
SYSTEM or MODE control. Refer to your thermostat owner’s
manual for more information.
To better protect your investment and to eliminate unnecessary
service calls, familiarize yourself with the following facts:
Step 1—Cooling Mode
With the SYSTEM or MODE control set to COOL, your unit will
run in cooling mode until the indoor temperature is lowered to the
level you have selected. On extremely hot days, your system will
run for longer periods at a time and have shorter “off” periods than
on moderate days.
Step 2—Heating Mode (with optional electric heaters)
Your system may have optional electric heaters for use when
heating is desired.
With the SYSTEM or MODE control of your indoor thermostat set
to HEAT, your unit will run in heating mode until room tempera-
ture is raised to the level you have selected. Of course, your system
will run for longer periods to maintain a comfortable environment
on cooler days and nights than on moderate ones.
MAINTENANCE AND SERVICE
This section discusses maintenance that should be performed by
your dealer.
ROUTINE MAINTENANCE
All routine maintenance should be handled by skilled, experienced
personnel. Your dealer can help you establish a standard proce-
dure.
For your safety, keep your unit area clear and free of combustible
materials, gasoline, and other flammable liquids and vapors.
To assure proper functioning of your unit, flow of condenser air
must not be obstructed from reaching the unit. Clearance from the
top of the unit is 48 in. (1220 mm). Clearance of at least 42 in.
(1070 mm) is required on sides, except the duct side which has a
12 in. (305 mm) minimum clearance.
MAINTENANCE AND CARE BY THE EQUIPMENT OWNER
Before proceeding with those things you might want to maintain
yourself, please carefully consider the following:
Fig. 1—Unit 50GS (50Hz)
C99001
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PC101CatalogNo.005–00000PrintedinU.S.A.FormOM50-31Pg110–01Replaces:New

1. TURN OFF ALL ELECTRICAL POWER TO YOUR
UNIT AND INSTALL LOCK-OUT TAG BEFORE SER-
VICING OR PERFORMING MAINTENANCE. ELEC-
TRIC SHOCK COULD CAUSE SERIOUS INJURY OR
DEATH.
2. When removing access panels or performing maintenance
functions inside your unit, be aware of sharp sheet metal
parts and screws. Although special care is taken to keep
sharp edges to a minimum, be extremely careful when
handling parts or reaching into the unit.
Air Filters
The air filter(s) should be checked about every 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 filters.
To replace or inspect filters (or accessory filter rack when
supplied):
1. Remove the filter access panel using a 5/16-in. (7.9 mm) nut
driver or wrench.
2. Remove the filter(s) by pulling it out of the unit. If the filter(s)
is dirty, clean or replace with a new one.
When installing the new filter(s), note the direction of the airflow
arrows on the filter frame.
If you have difficulty locating your air filter(s) or have questions
concerningproperfiltermaintenance,contactyourdealerfor
instructions.Whenreplacingfilters,alwaysusethesamesizeand
Never operate your unit without the filter(s) in place. Failure
to heed this warning may result in damage to the blower
motor and/or compressor. An accumulation of dust and lint on
internal parts of your unit can cause loss of efficiency and, in
some cases, a fire.
Fans and Fan Motor
Periodically, check the condition of fan wheels and housings and
fan-motor shaft bearings. Contact your dealer for the required
annual maintenance.
Indoor and Outdoor Coils
Cleaning of the coils should only be done by qualified service
personnel. Contact your dealer for the required annual mainte-
nance.
Condensate Drain
The drain and condensate line should be checked and cleaned at
the same time the cooling coils are checked by your dealer.
Compressor
All compressors are factory-shipped with a normal charge of the
correct type refrigeration grade oil. A compressor should rarely
require additional oil.
Condenser Fan
Do not poke sticks, screwdrivers, or any other objects into
revolving fan blades. Injury or equipment damage may result.
Thefanmustbekeptfreeofallobstructionstoensureproper
cooling. Contact your dealer for any required service.
Fig. 2—Filter Access Panel-Vertical Supply Shown
(Unit Shown with Optional Louvered Grille)
Table 1—Indoor-Air Filter Data
UNIT SIZE
50GS
(50 HZ) 024 030 036 048 060
RETURN-AIR
FILTER (mm)
Throwaway
20” x 20”
(508 x 508) 20” x 20” (508 x 508) 20” x 24” (508 x 609.6) 24” x 30” (609.6 x 762) 24” x 30” (609.6 x 762)
C00160
ACCESS PANEL
FILTER ACCESS
PANEL*
*For accessory filter rack.
2

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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Copyright 2001 CARRIER Corp. • 7310 W. Morris St. • Indianapolis, IN 46231 om5031
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC101CatalogNo.005–00000PrintedinU.S.A.FormOM50-31Pg410–01Replaces:New