Protection Control; High Pressure Protection Control - Daikin RXYQ96PYDN Service Manual

Protection Control

8. Protection Control
8.1

High Pressure Protection Control

This high pressure protection control is used to prevent the activation of protection devices due to
abnormal increase of high pressure and to protect compressors against the transient increase of
high pressure.
[In cooling operation]
Pc_max>503.15psi
When high
pressure is limited
compressor step:
Pc_max
>503.15psi
Pc_max
>514.75psi
For multi units:
When STD compressor is in operation
When STD compressor stays stopped
For single unit:
8 to 12HP
(6-10 Ton)
210
The following control is performed in the entire system.
Pc_max indicates the maximum value within the system.
Normal Operation
Upper limit
2-step down
After 10 sec.
Current step maintained
After 10 sec.
STD compressor standby
52Hz+OFF+OFF (upper limit)
52Hz+OFF (upper limit)
Upper limit compressor step=max (Max. Step)
Pc_max
>527.8psi
When occurring 3 times within
30 min., HPS is activated without high
High pressure
pressure standby, thus outputting the
standby
malfunction code [E3].
SiUS34-801A_b
Pc_max
<469.8 psi
Upper limit
compressor step:
1-step up
After 15 sec.
VRVIII R-410A Heat Recovery 60Hz