Protection Control; High Pressure Protection Control - Daikin VRV III REYQ8PY1B Service Manual

Protection Control

4.

Protection Control

4.1

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>3.47MPa
When high
pressure is limited
Upper limit
compressor step:
2-step down
Pc_max
>3.47MPa
Pc_max
>3.55MPa
For multi units:
When STD compressor is in operation
STD compressor standby
When STD compressor stays stopped
52Hz+OFF+OFF (upper limit)
For single unit:
8 to 12HP
14, 16HP
130
The following control is performed in the entire system.
Pc_max indicates the maximum value within the system.
Normal Operation
After 10 sec.
Current step maintained
After 10 sec.
52Hz+OFF
52Hz+52Hz (upper limit)
Upper limit compressor step=max (Max. Step)
Pc_max
>3.64MPa
When occurring 3 times within
30 min., HPS is activated without high
High pressure
pressure standby, thus outputting the
standby
malfunction code "E3".
Pc_max
<3.24MPa
Upper limit
compressor step:
1-step up
After 15 sec.
SiBE37-701
Function