84
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
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
PSIG
B. DISCHARGE PRESSURE
PSIG
PSIG
C. ENTERING AIR TEMPERATURE
_
F
_
F
D. LIQUID LINE TEMPERATURE
AT OUTLET OR REHEAT COIL
_
F
_
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 2018
Edition Date: 4/18
6
18
Printed in U.S.A.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No: 48LC---14---26---05SI
Replaces: 48LC--- 14--- 26--- 04SI
Summary of Contents for WeatherExpert 48LC
Page 5: ...5 C13057 Fig 2 Unit Dimensional Drawing 14 Size Unit Sheet 1 of 3 ...
Page 6: ...6 C13058 Fig 2 cont Unit Dimensional Drawing 14 Size Unit Sheet 2 of 3 ...
Page 7: ...7 C13059 Fig 2 cont Unit Dimensional Drawing 14 Size Unit Sheet 3 of 3 ...
Page 8: ...8 C13032 Fig 3 Unit Dimensional Drawing 17 and 20 Size Units Sheet 1 of 3 ...
Page 9: ...9 C13033 Fig 3 cont Unit Dimensional Drawing 17 and 20 Size Units Sheet 2 of 3 ...
Page 10: ...10 C13034 Fig 3 cont Unit Dimensional Drawing 17 and 20 Size Units Sheet 3 of 3 ...
Page 11: ...11 C14106 Fig 4 Unit Dimensional Drawing 24 and 26 Size Units Sheet 1 of 3 ...
Page 12: ...12 C14107 Fig 4 cont Unit Dimensional Drawing 24 and 26 Size Units Sheet 2 of 3 ...
Page 13: ...13 C14108 Fig 4 cont Unit Dimensional Drawing 24 and 26 Size Units Sheet 3 of 3 ...
Page 17: ...17 C13054 Fig 8 Roof Curb Details 14 Size Unit ...
Page 18: ...18 C13055 Fig 9 Roof Curb Details 17 and 20 Size Units ...
Page 19: ...19 C13056 Fig 10 Roof Curb Details 24 and 26 Size Units ...
Page 27: ...27 a48 9336 Fig 26 48LC 14 26 Electro mechanical Control Wiring Diagram ...
Page 28: ...28 a48 9337 Fig 27 48LC 14 26 RTU Open Control Wiring Diagram ...
Page 29: ...29 a48 9338 Fig 28 48LC 14 26 SystemVut Control Wiring Diagram ...
Page 31: ...31 a48 9339 Fig 30 Typical Power Wiring Diagram SystemVut Controls 48LC 26 208 230V Shown ...
Page 58: ...58 a48 9340 Fig 55 Typical EconoMi erR X Wiring Diagram ...