Johnson Controls HVWHP072B32S - Replacing Refrigerant Oil; Replacing Refrigerant Oil (no Clogging in Oil Return Pipe Assy)

SM-18006
4-25
MAINTENANCE
TURN OFF all POWER supply switches.
4.1.11 Replacing Refrigerant Oil
4.1.11.1 ReplacingRefrigerantOil(NoClogginginOilReturnPipeAssy)
(1) Remove the service cover and front cover according to Section 4.1.1 “Removing Service Cover and
Front Cover”.
(2) Remove the upper cover according to Section 4.1.3 “Removing Upper Cover”.
(3) Remove the rear cover according to Section 4.1.4 “Removing Rear Cover”.
(4) Remove the pipe cover according to Section 4.1.5 “Removing Pipe Cover”.
(5) Remove the side cover L according to Section 4.1.6 “Removing Side Cover”.
(6) Close(A)high/lowpressuregasstopvalve,(B)lowpressuregasstopvalve(onlyforheatrecovery
system),(C)liquidstopvalve.
(7) Collecttherefrigerantinthewatersourceunitfrom(E)lowpressureaccessportand(F)highpressure
access port. Check that the pressure does not increase at this time.
NOTE:
Ifthepressureincreases,collectalltherefrigerantintherefrigerantcycle.
(8) Connectthechargehose(forR410A)to(D)accessportforcollectingrefrigerantoil.
(9) Chargenitrogen(22psi(0.15MPa))from(E)lowpressureaccessportandcollecttherefrigerantoilin
theaccumulatorbyapplyingpressure(approx.20minutes).Theresidualrefrigerantoilindicatedinthe
gurecannotbecollectedbecauseoftheaccumulatorstructure.
NOTE:
Ensurethatthepressureon(F)highpressureaccessportisNOTabnormalwhennitrogenischarged.
(10) Stopchargingnitrogenaftertherefrigerantoilhasbeencompletelycollected.
Performvacuumingfrom(E)lowpressureaccessportandaddthesamequantityofoilasthe
collected refrigerant oil.
NOTE:
Whenthecollectedrefrigerantoilis0.79gal.(3L)orless,cloggingmayexistintheoilreturnpipeassy.
Inthatcase,replacetheoilreturnpipeassyaccordingtoSection4.1.11.2“ReplacingRefrigerantOil
(ClogginginOilReturnPipeAssy)andReplacingOilReturnPipeAssy”.