CONTROL SYSTEM
11-6
SM YUDE 2-A.1 GB
2. When RAT
≤20 degree, the unit runs in heating mode
3. When 20 degree <RAT< 26 degree, upon initial startup, the unit will enter auto mode and run in
automatic fan mode. If the other mode changes into auto mode, the previous running mode will
remain.
11.6
Dry Mode
The dry mode is basically same as cooling mode. The difference is that:
a) The indoor fan is fixed at low speed.
b) Max. Capacity output: A×90%
11.7
Oil return
When the unit is operating in low frequency for long time, the compressor will be forced to
decrease frequency for 4 min to make sure the oil, which accumulated into the system, back to
compressor.
During the oil return operation, the IDU has no any indication
11.8
Protections
There are 4 protection codes.
Normal (Norm)
– unit operate normally.
Stop Rise (SR)
– compressor frequency can not be raised but does not have to be decreased.
HzDown
– Compressor frequency is reduced by 2Hz/s
Stop Compressor (SC)
– Compressor is stopped.
11.8.1
Indoor Coil Defrost Protection
Conditions for Start Controlling
Judge the controlling start with the ICT (Indoor Coil Temperature) in cool and dry mode after
compressor is on for 15min to allow the operating frequency limitation and then prevent freezing of
the indoor heat exchanger.
Summary of Contents for YUDE024
Page 21: ...PERFORMANCE DATA SM YUDE 2 A 1 GB 5 1 5 PERFORMANCE DATA...
Page 26: ...WIRING DIAGRAMS 8 2 SM YUDE 2 A 1 GB 8 2 AWAU YUDE036 H11...
Page 27: ...WIRING DIAGRAMS SM YUDE 2 A 1 GB 8 3 8 3 AWAU YUDE036 H13 TBD...
Page 28: ...WIRING DIAGRAMS 8 4 SM YUDE 2 A 1 GB 8 4 AWSI CADE024 030 036 N11 For model 30 42...
Page 30: ...WIRING DIAGRAMS 8 6 SM YUDE 2 A 1 GB 8 6 AWSI DBD024 030 036 N11...
Page 72: ...APPENDIX SM YUDE 2 A 1 GB 14 1 14 APPENDIX APPENDIX...
