Daikin VRV III, Руководство по обслуживанию, Страница: 80 / 567

SiUS34-801A_b Protection Control
VRVIII R-410A Heat Pump 60Hz 65
8.2 Low Pressure Protection Control
This low pressure protection control is used to protect compressors against the transient decrease
of low pressure.
[In cooling operation]
Because of common low pressure, the following control is performed in the system.
Pe_min indicates the minimum value within the system.
Pe_min<49.3psi
Pe_min>56.55psi
Pe_min>42.05psi
Pe_min<36.25psi
Pe_min<10.15psi
Pe_min<21.75psi
W hen occ u rring 4 times w ithin 30 min.,
the malf u nction code [ E4 ] is displayed.
N ormal Operation
D u ring the control
of lo w press u re
protection
Restart stand b y ( u p to 3 times
w ithin a period of 30 min.)
For any model other than 144PTJU:
210Hz+OFF (
u pper)
For Model 144PTJU:
1/2 of compressor STEP
For any model other than 144PTJU:
52Hz+OFF (
u pper limit)
For Model 144PTJU:
52Hz+52Hz
Hot gas solenoid v al v e (Y5S, 144PTJU: Y4S)
O N