Carrier 50KC04-06 Service And Maintenance Instructions

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.Catalog No. 04-53500223-01 Printed in U.S.A. Form 50KC-4-6-01SM Pg CL-2 2-19 Replaces: NEW© Carrier Corporation 2019- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - -CUT ALONG DOTTED LINE CUT ALONG DOTTED LINEPRESSURES (Cooling Mode)Refrigerant Suction CIRCUIT A _____________ PSIG _____________ °FCIRCUIT B _____________ PSIG _____________ °FRefrigerant Discharge CIRCUIT A _____________ PSIG _____________ °FCIRCUIT B _____________ PSIG _____________ °FVerify Refrigerant Charge using Charging Charts (Y/N) _____Verify that 3-phase fan motor and blower are rotating in correct direction (Y/N) _____Verify that 3-phase scroll compressor is rotating in the correct direction (Y/N) _____GENERALEconomizer 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-UPNOTE: Units equipped with either SystemVu™ or RTU Open controls have Service Test menus or modes that can assist with theHumidi-MiZer System Start-Up function and provide the means to make the observations listed for this start-up.STEPS1. 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 RECORDA. Suction pressure _______________ PSIGB. Discharge pressure _______________ PSIGC. Entering air temperature _______________ ° FD. Liquid line temperature at outlet or reheat coil _______________ ° FE. 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 (sub-cooler) by closing humidistat with Y1 closed (Y/N) _____OBSERVEA. 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) _____OBSERVEA. Suction pressure increases to normal cooling levelB. Discharge pressure decreases (35 to 50 psi) (Limited by Motormaster control)C. Liquid temperature returns to normal cooling levelD. LSV solenoid energized (valve closes)E. DSV solenoid energized, valve opens7. 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) _____

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