Carrier 48FC Series Controls, Start-Up, Operation And Troubleshooting page 144

GENERAL
ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS
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III. HUMIDI- - MIZER
STEPS
j 1. USE SERVICE TEST MODE TO TURN ON MAXIMUM COOLING.
TURN ON COOL A1 TEST UNDER COOL TEST MENU.
j 2. ON 48/50 FC 07 AND 48/50GC UNITS: TURN ON CIR A LOADER TEST UNDER THE COOL TEST MENU.
OBSERVE AND RECORD
A. SUCTION PRESSURE
B. DISCHARGE PRESSURE
C. ENTERING AIR TEMPERATURE
D. LIQUID LINE TEMPERATURE
AT OUTLET OR REHEAT COIL
E. CONFIRM CORRECT ROTATION FOR COMPRESSOR
F. CHECK FOR CORRECT RAMP- -UP OF OUTDOOR FAN MOTOR AS CONDENSER COIL WARMS
j 3. CHECK UNIT CHARGE PER CHARGING CHART
j 4. SWITCH UNIT TO HIGH- -LATENT MODE (SUBCOOL) BY TURNING HUMIDIMIZER TEST TO SUBCOOL UNDER THE
COOL TEST MENU
OBSERVE
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. CLV SOLENOID ENERGIZED (VALVE CLOSES for no flow)
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j 5. SWITCH UNIT TO DEHUMID (REHEAT) BY TURNING HUMIDIMIZER TEST TO REHEAT UNDER THE
COOL TEST MENU
OBSERVE
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 COOLING LEVEL
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D. CLV SOLENOID ENERGIZED (VALVE CLOSES FOR NO FLOW)
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E. RDV SOLENOID ENERGIZED, VALVE OPENS FOR FLOW
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j 8. SWITCH UNIT TO OFF BY TURNING HUMIDIMIZER TEST TO OFF UNDER COOL TEST MENU
COMPRESSOR AND OUTDOOR FAN STOP; CLV AND RDV SOLENOIDS DE- -ENERGIZED
ECarrier Corporation 2019
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
R
SYSTEM START-UP
Edition Date: 2/19
Printed in U.S.A.
PSIG
PSIG
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Catalog No: 04--- 53480227--- 01
144
PSIG
PSIG
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Form No: 48/50FC ---GC ---01T
Replaces: New