Si04-306 Control Specification
Function and Control 55
3.10 Low Hz High Pressure Limit
Outline Heat Pump Only
Set the upper limit of high pressure in a low Hz zone. Set the upper limit of the indoor heat
exchanger temperature by its operating frequency of Hz. Separate into three zones, reset zone,
unchanged zone and drooping zone and the frequency control must be carried out in such
zones.
Detail Separate into Zones
Note: Drooping: The system stops 2 minutes after staying in the drooping zone.
3.11 Defrost Control
Outline Heat Pump Only
Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor
heat exchanger temperature must be more than its fixed value when finishing.
Detail Conditions for Starting Defrost
The starting conditions must be made with the outdoor air temperature and heat exchanger
temperature. Under the conditions that the system is in heating operation, 6 minutes after the
compressor is started and more than 44 minutes of accumulated time pass since the start of the
operation or ending the defrosting.
Conditions for Canceling Defrost
The judgment must be made with heat exchanger temperature. (4°C~12°C)
Frequency
Compressor
Four way valve
Fan
Electronic expansion
valve opening
ON
OFF
ON
OFF
ON
OFF
0Hz
5sec.
450pps450pps450pps
Initial opening
PI control
5sec.
45sec.60sec. 460 sec.
120sec.
(R2832)
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