Daikin REYQ8-48PY1B, Service Manual

Page: 146 / 477

Protection Control SiBE37-701_B
135 Function
[In heating operation and Simultaneous Cooling / Heating Operation]
★
The following control is performed in the system.
Pe_min indicates the minimum value within the system.
Normal Operation
Pe_min
<0.17MPa
& • Pe_min>0.23MPa
• Upper limit compressor step=max (Max. step)
During the control of low pressure protection
Compressor step:
2-step down
After 10 sec. Pe_min
<0.17MPa
• Pe_min
>0.27MPa
• Pe_min
<0.13MPa
Current step
maintained
After 15 sec.
• Pe_min
>0.20MPa
After 15 sec.
Upper limit compressor step:
2-step up
Upper limit compressor step:
1-step up
• After 10 sec.
Pe_min<0.07MPa
Low pressure
standby
When occurring 4 times within 30 min.,
the malfunction code “E4” is output.
For single unit:
8 to 12HP: 52Hz+OFF
14 to 16HP: 52Hz+52Hz (upper limit)
For multi units:
When STD compressor is in
operation
One STD compressor stops
When STD compressor stays
stopped
52Hz+OFF+OFF (upper limit)