Table of Contents
SiE12-411
3.10 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 47 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)
3.11 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.
Function and Control
2YC32 : 94Hz
2YC45 : 54Hz
43 minutes
0Hz
120 seconds
60 seconds
6 minutes
Start
1
Preparation
0
signal
0 seconds
1
Defrosting
0
signal
Compressor
ON
OFF
4-way valve
ON
OFF
5 seconds
Fan
ON
OFF
Solenoid
ON
valve
OFF
Operating room
450pps 450pps
Motorized valve
opening
Operation
stopped room
140pps
Motorized
valve opening
60°C
Highest heat
exchanger
Reset zone
temperature
among the
operating rooms
2YC32 : 94Hz
2YC45 : 52Hz
30 seconds 7 minutes
650 seconds
Completion
5 seconds
450pps
Initial opening
Initial opening
Drooping zone
59°C
Unchanged
zone
56°C
Control Specification
Pl control
95
Hide quick links:
Table of Contents
Troubleshooting
