68
III. HUMIDI--MIZER
R
SYSTEM START-UP
STEPS
j 1. CHECK CTB FOR JUMPER 5, 6, 7
JUMPER 5, 6, 7 MUST BE CUT AND OPEN
j 2. OPEN HUMIDISTAT CONTACTS
j 3. START UNIT IN COOLING (CLOSE Y1)
OBSER VE AND RECORD
A. SUCTION PRESSURE PSIG
B. DISCHARGE PRESSURE PSIG
C. ENTERING AIR TEMPERATURE _F
D. LIQUID LINE TEMPERATURE
AT OUTLET OR REHEAT COIL _F
E. CONFIRM CORRECT ROTATION FOR COMPRESSOR
F. CHECK FOR CORRECT RAMP--UP OF OUTDOOR FAN MOTOR AS CONDENSER COIL WARMS
j 4. CHECK UNIT CHARGE PER CHARGING CHART
j 5. SWITCH UNIT TO HIGH--LATENT MODE (SUBCOOLER) BY CLOSING HUMIDIST AT WITH Y1 CLOSED
OBSERVE
j A. REDUCTION IN SUCTION PRESSURE (5 TO 7 PSI EXPECTED)
j B. DISCHARGE PRESSURE UNCHANGED
j C. LIQUID TEMPERATURE DROPS TO 50 TO 55_F RANGE
j D. LIQUID SOLENOID VALVE (LSV) ENERGIZED (VALVE CLOSES)
j 6. SWITCH UNIT TO DEHUMID (REHEAT) BY OPENING Y1
OBSERVE
j A. SUCTION PRESSURE INCREASES TO NORMAL COOLING LEVEL
j B. DISCHARGE PRESSURE DECREASES (35 TO 50 PSI)
j C. LIQUID TEMPERATURE RETURNS TO NORMAL COOLING LEVEL
j D. LIQUID SOLENOID VALVE (LSV) ENERGIZED (VALVE CLOSES)
j E. DISCHARGE SOLENOID VALVE (DSV) ENERGIZED, VALVE OPENS
j 7. WITH UNIT IN DEHUMID MODE CLOSE W1
COMPRESSOR AND OUTDOOR FAN STOP; LSV AND DSV SOLENOIDS DE--ENERGIZED
j 8. OPEN W1 RESTORE UNIT TO DEHUMID MODE
j 9. OPEN HUMIDISTAT INPUT
COMPRESSOR AND OUTDOOR FAN STOP; LSV AND DSV SOLENOIDS DE--ENERGIZED
j 10. RESTORE SETPOINTS FOR THERMOSTAT AND HUMIDISTAT
REPEAT PROCESS FOR 2 COMPRESSOR SYSTEMS
ECarrier Corporation 2017 Edition Date: 12/17 Printed in U.S.A.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
C a t a l o g N o : 5 0 H C --- 7 --- 1 2 --- 0 6 S I
R e p l a c e s : 5 0 H C --- 7 --- 1 2 --- 0 4 SI
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