Household Unit Technical Service Manual
10
1.4.5 Selection of Installation Location
◇
The compressor condensing unit must be installed on the stable and firm supporting plane outside the
construction.
◇
The compressor condensing unit shall be installed as close as possible to the indoor unit, thus to
decrease the length and bends of the cooling pipe.
◇
Avoid installing the unit beneath the window or between the constructions; otherwise the normal
operating noise may invade into the room.
◇
Select a well-ventilated place where the inlet and outlet air will not be blocked.
◇
Do no install in a place subject to polluting air, e.g. flammable and explosive substances, heavy dusts,
salt fog, etc.
1.5 Range of Working Temperature
Indoor Unit
Outdoor Unit
Dry Bulb Temp.
( )
Wet Bulb Temp.
( )
Dry Bulb Temp.
( )
Wet Bulb Temp.
( )
Max. COOL Mode Operation
26.7 19.4 46.1 23.9
Min. COOL Mode Operation
21 15 21 -
Max. HEAT Mode Operation
26.7 - 23.9 18.3
Min. HEAT Mode Operation
20 - -5 -6
1.6 Adjustment of Refrigerant Charge
The charge before shipment is suitable a pipe length of 6m. If the pipe is longer than 6m, add refrigerant as
specified below:
Outer Diameter of Liquid Pipe (mm)
Additional Refrigerant Charge for Every 1.5m of Liquid
Pipe (g)
9.5 87
12.7 115
1.7 Working Principle and System Diagram
Cooling Cycle:
The compressor absorbs the low-temperature and low-pressure refrigerant steam from the
evaporator and compresses it into high-temperature high-pressure gas before discharging it into the
condenser. Within the condenser, the refrigerant gas exchanges heats with the outdoor air and transfers the
heats to the air. Then, it is condensed to high-temperature and high-pressure refrigerant liquid. After
reduction of temperature and pressure via throttling device, the refrigerant is changed to low-pressure
low-temperature gas and liquid phases. Then, it enters into the evaporator for heat exchange and turns into
low-temperature low-pressure gas refrigerant after absorbing the heats from the air. The refrigerant gas from
the evaporator is again absorbed into the compressor for compression. This cycle is so repeated and the
cooled air is continuously blown into the air conditioning area under the force of the fan.
Heating Cycle
: The heating cycle is reverse to the cooling cycle. Via –4way valve, the refrigerant changes
its flow direction in the system. That is, the high-temperature high-pressure refrigerant gas from the
compressor directly enters into the indoor side heat exchanger for condensing. In the heat exchanger, the
high-temperature high-pressure refrigerant exchanges the heats with the air and becomes liquid refrigerant
after discharging the heats. Via the throttling device, the liquid refrigerant enters into the outdoor side heat
changer for vaporization. After that, the low-temperature low-pressure refrigerant gas again enters into the
