Daikin RXYQ96PYDN, Service Manual

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SiUS34-801A_b Special Control
VRVIII R-410A Heat Pump 60Hz 61
7.6.2 Crankcase Heater Control
In order to prevent the refrigerant from condensing in the compressor oil when in the stopped mode, this mode is used to
control the crankcase heater.
7.7 Stopping Operation
7.7.1 When System is in Stop Mode (Normal operation stop)
This mode is used to define actuator operations when the system stops.
Solenoid valve (Refrigerant
regulator exhaust pipe)
SVO Y7S Y7S OFF
Solenoid valve (Refrigerant
regulator discharge pipe)
SVT Y6S Y8S OFF
Ending conditions — 2 min.
Actuator
Symbol
Elect. symbol
Operation
RXYQ
144PTJU
For any model
other than that
shown on the left
Compressor1 — M1C M1C OFF
Compressor2 — M2C M2C OFF
Outdoor unit fan1
—
M1F M1F OFF
Outdoor unit fan2 M2F — OFF
Electronic expansion valve
(Main)
EVM
Y1E
Y1E 0 pls
Y3E
Electronic expansion valve
(Subcooling)
EVT
Y2E
Y3E 0 pls
Y5E
Electronic expansion valve
(Refrigerant charge)
EVJ Y4E Y2E 80 pls
Four-way valve (Heat
exchanger switch)
20SA
Y2S
Y3S Holds
Y9S
Four-way valve (High/low
pressure gas pipe switch)
20SB Y8S Y2S Holds
Solenoid valve (Main bypass) SVE
Y5S
Y6S OFF
Y10S
Solenoid valve (Hot gas) SVP Y4S Y5S OFF
Solenoid valve (Refrigerant
regulator liquid pipe)
SVL Y3S Y4S OFF
Solenoid valve (Refrigerant
regulator gas vent pipe)
SVG Y1S Y1S OFF
Solenoid valve (Refrigerant
regulator exhaust pipe)
SVO Y7S Y7S OFF
Solenoid valve (Refrigerant
regulator discharge pipe)
SVT Y6S Y8S OFF
Ending conditions — Indoor unit thermostat is turned ON.
Crankcase heater
OFF
Crankcase heater
ON
Discharge pipe
temperature < 158 ˚F
Discharge pipe
temperature > 167 ˚F