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PRESSURES
Refrigerant Suction
Refrigerant Discharge
Verify Refrigerant Charge using Charging Charts (Y/N) _____
GENERAL
Economizer minimum vent and changeover settings to job requirements (if equipped) (Y/N) _____
Verify smoke detector unit shutdown by utilizing magnet test (Y/N) _____
IV. HUMIDI-MIZER
START-UP
®
NOTE: Units equipped 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 observations listed for this start-up.
STEPS
1. Check CTB for jumper 5, 6, 7 (Jumper 5, 6, 7 must be 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
B. Discharge pressure
C. Entering air temperature
D. Liquid line temperature at outlet or reheat coil
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
5. Switch unit to high-latent mode (sub-cooler) by 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. Liquid temperature drops to 50 to 55°F range (Y/N) _____
D. LSV solenoid energized (valve closes) (Y/N) _____
6. Switch unit to dehumid (reheat) by opening Y1 (Y/N) _____
OBSERVE
A. Suction pressure increases to normal cooling level (Y/N) _____
B. Discharge pressure decreases (35 to 50 psi) (Limited by Motormaster control) (Y/N) _____
C. Liquid temperature returns to normal cooling level (Y/N) _____
D. LSV solenoid energized (valve closes) (Y/N) _____
E. DSV solenoid energized, valve opens (Y/N) _____
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) _____
REPEAT PROCESS FOR 2 COMPRESSOR SYSTEMS.
© 2021 Carrier
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53500292-01
CIRCUIT A _____________ PSIG
CIRCUIT B _____________ PSIG
CIRCUIT A _____________ PSIG
CIRCUIT B _____________ PSIG
®
temperature sensor during this check. Remove jumper when complete.)
Printed in U.S.A.
Form 50LC-14-26-06SI
_______________ PSIG
_______________ PSIG
_______________ ° F
_______________ ° F
Pg CL-2
1-2021
Replaces: 50LC-14-26-05SI
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