Idea ISW-10 SF1-DN1, Installation Manual, Page: 6 / 66

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1.5 HEATING OPERATION
1. The working fluid, in its gaseous state, is pressurized and circulated through the system by a
compressor, and then go into the heat exchanger through the fore-way reversing valve. The unit to
release heat though the water, and the refrigerant is condensed into a high pressure liquid.
2. The high pressure liquid refrigerant that has been condensed by the condenser enters the expansion
valve. The liquid refrigerant expands and changes state after throttling, and becomes a low-temperature,
low-pressure liquid refrigerant and a part of the gaseous refrigerant.
3. After passing through the pipeline, the liquid refrigerant evaporates and absorbs the heat of the air in
the air-side heat exchanger to become a gaseous refrigerant.
4. Finally, the gaseous refrigerant enters the compressor through the four-way reversing valve and the
compressor suction line then compress again and the cycle is repeated.
1.6 DEFROST OPERATION
1. When the unit is running in the heating mode in a low ambient temperature, the air side heat
exchanger may frost, which will affect the heating effect, so defrosting is required.
2. The defrost controller performs long-term monitoring by combining the air side coil temperature and
the timer to determine whether defrosting is required.
3. The unit changes the heating operation to the cooling operation through the four-way reversing valve.
At this moment, the high-temperature and high-pressure gaseous refrigerant is defrost through the air
side heat exchanger. The fan does not operate during the defrost time of the compressor.
4. After the defrosting is completed, the cooling operation is resumed to the normal state - heating
operation by switching the four-way switching valve.
1.7 PERFORMANCE PARAMETERS
FULL DC INVERTER SPlIT HEAT PUMP
MODEL
ISW-10
SF1-DN1/
SPMI
ISW-15
SF1-DRN1
/SPM
ISW-18
SF1-DRN1/
SPM
ISW-24
SF1-DRN1/SPM
ISW-32
SF1-DRN1/
SPM
Working Temperature Range
-25
～
43
℃
Power Supply
220-240V/5
0Hz/1N
380-415V/50Hz/3N
A7W35
Heating capacity
(min-max) (kW)
10(3-11) 16(4-17) 18(4-20) 24(5-27) 32(5-35)
Input power (kW) 2.30 4.0 4.45 6.00 8.00
Rated current (A) 10.50 7.5 9.00 10.00 12.00
COP 4.00 4.0 4.04 4.00 4.00