Daikin RXYQ96PYDN, Руководство по обслуживанию

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SiUS34-801A_b Special Control
VRVIII R-410A Heat Recovery 60Hz 199
conditions of indoor units with thermostat ON, thus maximizing the equipment capacity.
[Starting conditions]
•
The system starts heating operation with thermostat ON at a high load.
•
The system completes defrosting operation.
•
The system switches the operation mode from cooling to heating or simultaneous
cooling and heating operation.
[Control]
1. Start multiple INV compressors in the system at one time.
2. Start multiple STD compressors in the system at intervals of 15 seconds.
7.3 Oil Return Operation
This function is used to recover refrigerant oil that flows out from the compressor to the system side by conducting oil return
operation in order to prevent the compressor from running out of refrigerant oil.
7.3.1 Cooling Oil Return Operation
[Start conditions]
Referring to the following conditions, start cooling oil return operation.
• Integral oil rise rate is reached to specified level.
• When cumulative compressor operating time exceeds 8 hours (2 hours when the power supply turns ON for the
first time)
Furthermore, the integral oil rise rate is calculated by Tc, Te, and compressor loads.
Start up STD compressors at intervals of 15 seconds.
INV
STD
0
71
142
2 8 5
213
356
psi
Press u re
Pc
Pe
Time
Nu m b er of
compressors
OR
OR