Daikin RXYQ96PYDN Service Manual page 228

SiUS34-801A_b
[In heating operation and Simultaneous Cooling / Heating Operation]
During the control of low pressure protection
Pe_min
>39.15psi
After 15 sec.
Upper limit compressor step:
2-step up
8.3 Discharge Pipe Protection Control
This discharge pipe protection control is used to protect the compressor internal temperature
against a malfunction or transient increase of discharge pipe temperature.
[Contents]
VRVIII R-410A Heat Recovery 60Hz
The following control is performed in the system.
Pe_min indicates the minimum value within the system.
Normal Operation
Pe_min
<24.65psi
Compressor step:
After 10 sec.
Pe_min
<24.65psi
Current
step maintained
Pe_min
After 15 sec.
>29psi
Upper limit compressor step:
1-step up
Low pressure
The following control is performed for each compressor of single unit as well as multi units.
Pe_min>33.35psi
&
Upper limit compressor step=max (Max. step)
Pe_min
<18.85psi
After 10 sec.
Pe_min<10.15psi
When occurring 4 times within 30 min.,
the malfunction code [E4] is displayed.
standby
Protection Control
For single unit:
8 to 12HP: 52Hz+OFF (upper limit)
For multi units:
When STD compressor is in
operation
One STD compressor stops
When STD compressor stays
stopped
52Hz+OFF (upper limit)
213