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33
Fig. 33 — Hot Gas Bypass Option
Fig. 34 — Location of Hot Gas Bypass in 38AUDC12
38AUDC with SVR Relays
With no thermostat demand, there will be no voltage at
LVTB-A1; HGBP SOLENOID is de-energized and solenoid
valve remains closed, preventing bypass vapor from the desu-
perheating tank to enter the suction line at the compressor.
On a thermostat call for first-stage cooling, LVTB terminal
Y1 is powered; when CADM1 is satisfied, compressor con-
tactor C1 and Solenoid Valve Relay SVR1 are energized.
SVR1 contacts close, providing 24-v to LVTB terminal A1,
then through HGBP RELAY NC contacts to HGBP SOLE-
NOID. HGBP solenoid valve opens, allowing bypass vapor
from the desuperheating tank to enter the compressor suction
port.
If thermostat calls for second stage cooling, LVTB termi-
nal Y2 is powered; when CADM2 is satisfied, compressor
contactor C2, Solenoid Valve Relay SVR2 and HGBP RE-
LAY are energized. HGBP RELAY NC contacts open, de-en-
ergizing the HGBP SOLENOID; solenoid valve closes,
blocking bypass vapor from the desuperheating tank and unit
runs at full cooling capacity.
The model 38AUDC also includes the 32LT Motormaster
low ambient control as a standard feature. Refer to Appendix
C for information on the Motormaster control.
All Units
If either the Low Pressure Switch or High Pressure Switch
opens while thermostat output Y1 or Y2 remain energized,
the compressor contactor is de-energized, the compressor
stops and liquid line solenoid is de-energized (valve closes).
CADM initiates a TRIP event (cooling demand sensed at
S
UCTION LINE
LIQUID LINE
WATCH
YOUR
S
UCTION
RI
S
ER
S
HOT GA
S
LINE
COMPRE
SS
OR
CONDEN
S
ER
COIL
EVAPORATOR
COIL
S
OLENOID
VALVE
HOT GA
S
BULB
TO
S
UCTION LINE
AND IN
S
ULATE
S
CHRADER VALVE
AT BOTTOM
LIQ INJ BULB
TO
S
UCTION LINE
HOT GA
S
DE-
S
UPERHEAT
CHAMBER
Hot Gas Bypass
Factory Installed
Option
Summary of Contents for Gemini 38AU07 Series
Page 5: ...5 Fig 3 38AUD Z 07 14 Base Unit Dimensions ...
Page 19: ...19 Fig 17 Typical Single Circuit Single Stage 38AUZ Wiring Diagrams ...
Page 20: ...20 Fig 18 Typical Single Circuit Two Stage 38AUZ Wiring Diagram ...
Page 21: ...21 Fig 19 Typical Dual Circuit Two Stage 38AUD Wiring Diagram ...
Page 30: ...30 Fig 30 38AUZD E08 Charging Chart RTPF 7 5 Ton Dual Stage Charging Chart R 410A Refrigerant ...
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