Specifications

Page 9
2nd STAGE
EVAPORATOR
INDOOR COIL
1st STAGE
EVAPORATOR
INDOOR COIL
GCS241353, 1603 EVAPORATOR PLUMBING
FIGURE 6
LIQUID LINE
2nd STAGE
EXPANSION VALVE
1ST STAGE
EXPANSION VALVE
FREEZESTAT (S50)
SUCTION LINE
LIQUID LINE
FREEZESTAT (S49)
SENSING BULB
SENSING BULB
EQUALIZER LINE
EQUALIZER LINE
C-Cooling Components
Summary of Features
GCS241353 / 1603 units use independent cooling circuits
consisting of separate compressors, condenser coils and
evaporator coils. See figure 5. A draw-through type condens
er fan is used in all units. Both 10 and 12.5 ton units have two
condenser fans. All 10 and 12.5 ton units are equipped with a
single beltdrive blower that draws air across the evaporator
during unit operation.
Cooling may be supplemented by fieldinstalled economizer.
The evaporators are slab type and are stacked as shown in
figure 6. Each evaporator uses a thermostatic expansion
valve as the primary expansion device. Each evaporator is
also equipped with enhanced fins and rifled tubing. In all units
each compressor is protected by a crankcase heater, high
pressure switch and low pressure switch. Additional protec
tion is provided by factory installed low ambient thermostat
(unit control box) and freezestats (on each evaporator). Each
cooling circuit is equipped with a thermometer well for charg
ing.
1-Compressors B1 and B2 (all units)
Ten ton units use two five ton scroll compressors, while 12.5
ton units use two 6.25 ton reciprocating compressors. Com
pressors are supplied by various manufacturers. All units are
equipped with two independent cooling circuits. Compressor
electrical specifications vary by manufacturer. Likewise, com
pressor capacity may vary from first stage to second stage. In
all cases, the capacity of each compressor is added to reach
the total capacity of the unit. See unit rating plate for specific
compressor capacity ratings and electrical data.
WARNING
Electrical shock hazard. Compressor must be
grounded. Do not operate without protective cover
over terminals. Disconnect power before removing
protective cover. Discharge capacitors before ser
vicing unit. Failure to follow these precautions could
cause electrical shock resulting in injury or death.
Compressor B1 operates during all compressor cooling de
mand and is energized by contactor K1 upon receiving a first
stage demand. Compressor B2 operates only during second
stage cooling demand and is energized by contactor K2.
NOTE-Refer to wiring diagram section B9 for specific unit
operation.