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CUT ALONG D OTTED LINE CUT ALONG DOTTED LINE
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations. CL-2 Replaces: New
© 2021 Carrier Cat. No. 04-53581025-01 Edition Date: 8-21 Printed in U.S.A. Form No: II581K-F-4-6-01 Rev. A
PRESSURES
Gas Inlet Pressure in. wg _____________ in. wg
Gas Manifold Pressure STAGE 1 _____________ in. wg
STAGE 2 _____________ in. wg
Refrigerant Suction CIRCUIT A _____________ PSIG
CIRCUIT B _____________ PSIG
Refrigerant Discharge CIRCUIT A _____________ PSIG
CIRCUIT B _____________ PSIG
Verify Refrigerant Charge us
ing 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. PERFECT HUMIDITY™ SYSTEM START-UP
STEPS
1. Check UCB (Unit Control Board) for jumper 1, 2, 3 (Jumper 1, 2, 3 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 _______________ 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 (Y/N) _____
F. Check for correct ramp-up of outdoor fan motor as condenser coil warms (Y/N) _____
4. Switch unit to high-latent mode (sub-cooler) by closing humidistat with Y1 clo
sed (Y/N) _____
5
. Check unit charge per charging chart (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°F 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
B. Discharge pressure decreases (35 to 50 psi) (Limited by head pressure control)
C. Liquid 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) _____
1
0. Restore set points for thermostat and humidistat (Y/N) _____
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