Carrier 48LC Series Controls, Start-Up, Operation And Troubleshooting page 190

PRESSURES
Gas Inlet Pressure in. wg (48LC)
Gas Manifold Pressure (48LC)
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) _____
®
IV. HUMIDI-MIZER SYSTEM START-UP
STEPS
1. Start unit In cooling (Close Y1) (Y/N) _____
OBSERVE AND RECORD
A. Suction pressure
B. Discharge pressure
C. Entering air temperature
D. Leaving air temperature
2. Switch unit to mixed cool and reheat mode (subcool)
OBSERVE
A. Reduction in suction pressure (5 to 7 psi expected) (Y/N)_____
B. Discharge pressure unchanged
C. Delta temperature decreases, close to neutral air
3. Switch unit to hot gas reheat mode.
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
4. With unit in dehumid mode switch to heating and verify compressor and outdoor fan stop
5. Turn off heating, cooling, and reheat, restore set points for thermostat and humidistat
REPEAT PROCESS FOR 2 COMPRESSOR SYSTEMS
© Carrier Corporation 2019
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Catalog No. 04-53480263-01
____________ in. wg
STAGE 1 _____________ in. wg
STAGE 2 _____________ in. wg
CIRCUIT A
CIRCUIT A (superheat)
CIRCUIT A
CIRCUIT A (subcooling)
Printed in U.S.A. Form S-VU-LC-4-26-02T
_____________ PSIG
_____________ °F
_____________ PSIG
_____________ °F
_______________ PSIG
_______________ PSIG
_______________ ° F
_______________ ° F
(Y/N) _____
(Y/N) _____
(Y/N) _____
Pg CL-2
(Y/N) _____
(Y/N) _____
6-19 Replaces: S-VU-LC-4-26-01T