64
III. HUMIDI--MIZER
R
SYSTEM START-UP
NOTE:
Units equipped with either SystemVu
t
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
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 HUMIDISTAT 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. LIQUID SOLENOID VALVE (LSV) ENERGIZED (VALVE CLOSES)
j
E. DISCHARGE SOLENOID VALVE (DSV) 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
REPEAT PROCESS FOR 2 COMPRESSOR SYSTEMS
E
Carrier Corporation 2017
Edition Date: 06/17
618
Printed in U.S.A.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No: 50LC---7---04SI
Replaces: 50LC--- 7--- 03SI
Summary of Contents for WeatherExpert 50LC
Page 4: ...4 a50 9584 Fig 2 Unit Dimensional Drawing ...
Page 5: ...5 a50 9585 Fig 2 Unit Dimensional Drawing cont ...
Page 14: ...14 a50 9586 Fig 17 50LC 07 Electro mechanical Control Wiring Diagram ...
Page 15: ...15 a50 9592 Fig 18 50LC 07 RTU Open Control Wiring Diagram ...
Page 16: ...16 a50 9587 Fig 19 50LC 07 SystemVut Control Wiring Diagram ...