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509 01 3808 00
Specifications are subject to change without notice.
PRESSURES (CONT.)
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VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS
GENERAL
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ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS (IF EQUIPPED)
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VERIFY SMOKE DETECTOR UNIT SHUTDOWN BY UTILIZING MAGNET TEST
III. HOT GAS RE--HEAT START-UP
STEPS
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1. CHECK CTB FOR JUMPER 5, 6, 7
JUMPER 5, 6, 7 MUST BE CUT AND OPEN
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2. OPEN HUMIDISTAT CONTACTS
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3. START UNIT IN COOLING (CLOSE Y1)
OBSERVE 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. CONFRIM CORRECT ROTATION FOR COMPRESSOR
F. CHECK FOR CORRECT RAMP--UP OF OUTDOOR FAN MOTOR AS CONDENSER COIL WARMS
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4. CHECK UNIT CHARGE PER CHARGING CHART
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5. SWITCH UNIT TO HIGH--LATENT MODE (SUBCOOLER) BY CLOSING HUMIDISTAT WITH Y1 CLOSED
OBSERVE
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A. REDUCTION IN SUCTION PRESSURE (5 TO 7 PSI EXPECTED)
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B. DISCHARGE PRESSURE UNCHANGED
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C. LIQUID TEMPERATURE DROPS TO 50 TO 55
_
F RANGE
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D. LIQUID SOLENOID VALVE (LSV) ENGERIZED (VALVE CLOSES)
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6. SWITCH UNIT TO DEHUMID (REHEAT) BY OPENING Y1
OBSERVE
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A. SUCTION PRESSURE INCREASES TO NORMAL COOLING LEVEL
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B. DISCHARGE PRESSURE DECREASES (35 TO 50 PSI)
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C. LIQUID TEMPERATURE RETURNS TO NORMAL COOLNG LEVEL
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D. LIQUID SOLENOID VALVE (LSV) ENERGIZED (VALVE CLOSES)
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E. DISCHARGE SOLENOID VALVE (DSV) ENERGIZED, VALVE OPENS
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7. WITH UNIT IN DEHUMID MODE CLOSE W1
COMPRESSOR AND OUTDOOR FAN STOP; LSV AND DSV SOLENOIDS DE--ENERGIZED
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8. OPEN W1 RESTORE UNIT TO DEHUMID MODE
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9. OPEN HUMIDISTAT INPUT
COMPRESSOR AND OUTDOOR FAN STOP; LSV AND DSV SOLENOIDS DE--ENERGIZED
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10. RESTORE SETPOINTS FOR THERMOSTAT AND HUMIDISTAT
REPEAT PROCESS FOR 2 COMPRESSOR SYSTEMS
Copyright 2016 International Comfort Products
Lewisburg, TN 37091 USA
Replaces: 509 01 3807 00