Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500167-01
Printed in U.S.A.
Form 50LC-14-26-03SM
Pg CL-2
2-2020
Replaces: 50LC-14-26-02SM
© Carrier Corporation 2020
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CUT ALON
G
DOTT
E
D
LINE
CU
T ALONG DOTTED LINE
PRESSURES
(Cooling Mode)
Refrigerant Suction
CIRCUIT A _____________ PSIG
_____________ °F
CIRCUIT B _____________ PSIG
_____________ °F
Refrigerant Discharge
CIRCUIT A _____________ PSIG
_____________ °F
CIRCUIT B _____________ PSIG
_____________ °F
Verify Refrigerant Charge using Charging Charts (Y/N) _____
Verify that 3-phase fan motor and
b
lower are rotating in correct direction (Y/N) _____
Verify that 3-phase scroll compressor is rotating in the correct direction (Y/N) _____
GENERAL
Economizer minimum vent and changeover settings to jo
b
re
q
uirements (if e
q
uipped) (Y/N) _____
Verify smoke detector unit shutdown
b
y utilizing magnet test (Y/N) _____
IV. HUMIDI-MIZER
®
START-UP
NOTE: Units e
q
uipped with either SystemVu™ 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 o
b
servations listed for this start-up.
STEPS
1. Check CTB for jumper 5, 6, 7 (Jumper 5, 6, 7 must
b
e cut and open) (Y/N) _____
2. Open humidistat contacts (Y/N) _____
3. Start unit In cooling (Close Y1) (Y/N) _____
OBSERVE AND RECORD
A. Suction pressure
_______________ PSIG
B. Discharge pressure
_______________ PSIG
C. Entering air temperature
_______________ ° F
D. Li
q
uid line temperature at outlet or reheat coil
_______________ ° F
E. Confirm correct rotation for compressor (Y/N) _____
F. Check for correct ramp-up of outdoor fan motor as condenser coil warms (Y/N) _____
4. Check unit charge per charging chart (Y/N) _____
(Jumper 32L Motormaster
®
temperature sensor during this check. Remove jumper when complete.)
5. Switch unit to high-latent mode (su
b
-cooler)
b
y closing humidistat with Y1 closed (Y/N) _____
OBSERVE
A. Reduction in suction pressure (5 to 7 psi expected) (Y/N) _____
B. Discharge pressure unchanged (Y/N) _____
C. Li
q
uid temperature drops to 50°F to 55°F range (Y/N) _____
D. LSV solenoid energized (valve closes) (Y/N) _____
6. Switch unit to dehumid (reheat)
b
y opening Y1 (Y/N) _____
OBSERVE
A. Suction pressure increases to normal cooling level
B. Discharge pressure decreases (35 to 50 psi) (Limited
b
y Motormaster control)
C. Li
q
uid temperature returns to normal cooling level
D. LSV solenoid energized (valve closes)
E. DSV solenoid energized, valve opens
7. With unit in dehumid mode close W1 compressor and outdoor fan stop; LSV and DSV solenoids de-energized
(Y/N) _____
8
. Open W1 restore unit to dehumid mode (Y/N) _____
9. Open humidistat input compressor and outdoor fan stop; LSV and DSV solenoids de-energized (Y/N) _____
10. Restore set-points for thermostat and humidistat (Y/N) _____
Summary of Contents for 50LC 14
Page 26: ...26 Fig 34 50LC 14 26 Control Wiring Diagram...
Page 27: ...27 Fig 35 50LC 14 26 RTU Open Control Wiring Diagram...
Page 28: ...28 Fig 36 50LC 14 20 208 230V 3 Phase Power Wiring Diagram...
Page 29: ...29 Fig 37 50LC 24 26 208 230V 3 Phase Power Wiring Diagram...
Page 30: ...30 Fig 38 50LC 14 26 460V 575V 3 Phase Power Wiring Diagram...