44
GENERAL
j ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTING S TO JOB REQUI REMEN TS (IF EQU IPP ED)
j VERIF Y SMO KE DETECT OR UNI T SHU TDOWN BY UTILIZI NG MAGNET TEST
III. PERFECT H UMIDITYt SYSTEM START-UP
NOTE: Units equipped with RTU--Open controls have Service Test menus or modes that can assist with the Perfect
Humidity System Start--Up function and provide the means to make the observations listed for this 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)
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. 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. LSV SOLENOID 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. LSV SOLENOID ENERGIZED (VALVE CLOSES)
j E. DSV SOLENOID 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
Copyright 2018 Bryant Heating & Cooling Systems Edition Date: 4/ 18 518 Printed in U.S.A.
Manufacturer reserves the right to change, at any ti me, specifications and designs without notice and without obligations.
Catalog No: II582J---4---6---02
Replaces: II582J--- 4--- 6---01
582J
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