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Fig. 44 — Separating Coil Sections
7. Secure inner and outer coil rows together with a field-
supplied fastener.
8. Reposition the outer coil section and remove the coil cor-
ner post from between the top panel and center post. Re-
install the coil corner post and replace all screws.
CONDENSATE DRAIN — Check and clean each year at
start of cooling season. In winter, keep drain dry or protect
against freeze-up.
FILTERS — Clean or replace at start of each heating and cool-
ing season, or more often if operating conditions require it. Re-
placement filters must be same dimensions as original filters.
OUTDOOR-AIR INLET SCREEN — Clean screen with
steam or hot water and a mild detergent. Do not use disposable
filters in place of screen.
BELTS — Check belt tension at least once each heating or
cooling season or as conditions require.
Lubrication
COMPRESSORS — Each compressor is charged with the
correct amount of oil at the factory.
FAN MOTOR BEARINGS — Fan motor bearings are of the
permanently lubricated type. No further lubrication is required.
No lubrication of condenser or evaporator fan motors is
required.
Manual Outdoor-Air Damper —
blade adjustment is required, see Manual Outdoor-Air Damper
section on page 15.
Economizer Adjustment —
EconoMi$er2 section on page 16.
Condenser-Fan Adjustment (Fig. 45) —
unit power supply. Remove condenser-fan assembly (grille,
motor, and fan) and loosen fan hub setscrews. Adjust fan
height as shown in Fig. 45. Tighten setscrews and replace
condenser-fan assembly.
If outdoor-air damper
Refer
to
Optional
Shut off
46
Refrigerant Charge —
listed on unit nameplate (also refer to Tables 1A and 1B). Refer
to Carrier GTAC2-5 Charging, Recovery, Recycling, and Rec-
lamation training manual and the following procedures.
Unit panels must be in place when unit is operating during
charging procedure.
NO CHARGE — Use standard evacuating techniques. After
evacuating system, weigh in the specified amount of refriger-
ant. (Refer to Tables 1A and 1B.)
LOW-CHARGE COOLING — Using Cooling
Charts, Fig. 46-49, vary refrigerant until the conditions of the
appropriate chart are met. Note the charging charts are different
from type normally used. Charts are based on charging the
units to the correct superheat for the various operating condi-
tions. Accurate pressure gage and temperature sensing device
are required. Connect the pressure gage to the service port on
the suction line. Mount the temperature sensing device on the
suction line and insulate it so that outdoor ambient temperature
does not affect the reading. Indoor-air cfm must be within the
normal operating range of the unit.
TO USE COOLING CHARGING CHART — Take the out-
door ambient temperature and read the suction pressure gage.
Refer to chart to determine what suction temperature should
be. If suction temperature is high, add refrigerant. If suction
temperature is low, carefully recover some of the charge.
Recheck the suction pressure as charge is adjusted.
EXAMPLE: (Fig. 48)
Outdoor Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85 F
Suction Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80 psig
Suction Temperature should be . . . . . . . . . . . . . . . . . . . . . 76 F
(Suction Temperature may vary ±5 F.)
Flue Gas Passageways —
tor box and upper areas of the heat exchanger:
1. Remove the combustion blower wheel and motor assem-
bly according to directions in Combustion-Air Blower
section on page 49.
2. Remove the flue cover to inspect the heat exchanger.
3. Clean all surfaces as required using a wire brush.
Fig. 45 — Condenser-Fan Adjustment
Amount of refrigerant charge is
Charging
To inspect the flue collec-
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