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GENERAL
j ECONOMIZER MINIMUM VENT AND CHANGEOVER SETTINGS TO JOB REQUIREMENTS (IF EQUIPPED)
j VERIFY SMOKE DETECTOR UNIT SHUTDOWN BY UTILIZING MAGNET TEST
III. HUMIDI- -MIZER
NOTE: Units equipped with either SystemVut or RTU- - Open controls have Service Test menus or modes that can assist
with the Humidi- - MiZer 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
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 4. CHECK UNIT CHARGE PER CHARGING CHART
j 5. SWITCH UNIT TO HIGH- - LATENT MODE (SUBCOOLER) BY CLOSING HUMIDISTAT WITH Y1 CLOSED
OBSERVE
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
j 6. SWITCH UNIT TO DEHUMID (REHEAT) BY OPENING Y1
OBSERVE
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
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 2018
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
R
SYSTEM START-UP
Edition Date: 4/18
618
PSIG
PSIG
_F
_F
Printed in U.S.A.
68
Catalog No: 48LC ---7---05SI
Replaces: 48LC--- 7--- 04SI
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