III. HUMIDIMIZER START-UP (50TC-B07 ONLY)
STEPS
[Z 1. CHECK CTB FOR JUMPER 5, 6, 7
JUMPER 5, 6, 7 MUST BE CUT AND OPEN
[Z 2. OPEN HUMIDISTAT CONTACTS
[Z 3. START UNIT IN COOLING (CLOSE Y1)
OBSERVE AND RECORD
A. SUCTION PRESSURE
B. DISCHARGE PRESSURE
C. ENTERING AIR TEMPERATURE
D. LIQUID LINE TEMPERATURE
AT OUTLET OR REHEAT COIL
PSIG
PSIG
oF
°F
E. CONFRIM CORRECT ROTATION FOR COMPRESSOR
F. CHECK FOR CORRECT RAMP-UP OF OJUTDOOR FAN MOTOR AS CONDENSER COIL WARMS
4. CHECK UNIT CHARGE PER CHARGING CHART
5. SWITCH UNIT TO HIGH-LATENT MODE (SUBCOOLER) BY CLOSING HUMIDISTAT WITH Y1 CLOSED
OBSERVE
REDUCTION IN SUCTION PRESSURE (5 TO 7 PSI EXPECTED)
DISCHARGE PRESSURE UNCHANGED
LIQUID TEMPERATURE DROPS TO 50 TO 55 °F RANGE
LSV SOLENOID ENGERIZED (VALVE CLOSES)
6. SWITCH UNIT TO DEHUMID (REHEAT) BY OPENING Y1
OBSERVE
[Z A.
[Z B.
[3 C.
[Z D.
[Z A.
[Z B.
[3 C.
[Z D.
[Z E.
[37.
SUCTION PRESSURE INCREASES TO NORMAL COOLING LEVEL
DISCHARGE PRESSURE DECREASES (35 TO 50 PSI)
LIQUID TEMPERATURE RETURNS TO NORMAL COOLNG LEVEL
LSV SOLENOID ENERGIZED (VALVE CLOSES)
DSV SOLENOID ENERGIZED, VALVE OPENS
WITH UNIT IN DEHUMID MODE CLOSE W1
COMPRESSOR AND OUTDOOR FAN STOP; LSV AND DSV SOLENOIDS DE-ENERGIZED
OPEN W1 RESTORE UNIT TO DEHUMID MODE[38.
[Z 9. OPEN HUMIDISTAT INPUT
COMPRESSOR AND OUTDOOR FAN STOP; LSV AND DSV SOLENOIDS DE-ENERGIZED
[Z 10. RESTORE SETPOINTS FOR THERMOSTAT AND HUMIDISTAT
Copyright 2015 Carrier Corp. • 7310 W. Morris St. • Indianapolis, IN 46231 Edition Date: 03/15
Manufacturer reserves the right to change, at any time, specification8 and design8 without notice and without obligations,
Catalog No: 50TC-4-7-02SI
Replaces: 50TC-4-7-OlSI
56
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