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OUTDOOR TECHNICAL OVERVIEW
B-7
ENGLISH
Operations
1
Temperature Sensor Td
The temperature of the compressor discharge hot gas will be
monitored by the Discharge Temperature Sensor. If the sensor
reads too hot or cool, the frequency/status of the operation
will be adjusted accordingly.
The hot gas will leave the oil separator and enter the 4-way
valve, which directs the hot gas to the outdoor coil. The
refrigerant will condense in the outdoor coil and be subcooled.
The refrigerant is now in a liquid state.
2
Temperature Sensor Toci
The temperature of the hot gas leaving the 4-way valve will be
monitored by the Toci Temperature Sensor. This temperature
should be near the temperature of the compressor discharge
gas temperature. If it is not, there is a problem with the 4-way
valve. The PCB will detect the temperature dierence and
generate an Error Code.
3
Temperature Sensor Tc
This sensor monitors the temperature of the outdoor
coil during condensing operation. If abnormal condensing
temperature is detected, the outdoor fan motor speed or
compressor frequency may be adjusted.
4
Temperature Sensor Ta
The outdoor air temperature will be monitored by the PCB.
If the outdoor air temperature rises or falls, the speed of the
outdoor fan may be changed.
5
Temperature Sensor Tc2
The Liquid Pipe Sensor will monitor the temperature of the
refrigerant leaving the EEV.
The low pressure low temperature refrigerant will enter the
mixed phase liquid line and travel to the indoor unit. Heat from
the indoor air passing across the evaporator coil will transfer
to the cold refrigerant, sending cool air into the space and
changing the liquid refrigerant into a cool vapor.
The cold vapor will travel down the vapor line and return to the
outdoor unit via a path through the gas stop valve.
6
Temperature Sensor Tc1
The Gas Pipe Sensor will monitor the temperature of the
gas pipe to calculate the dierence between Liquid Pipe
Temperature and Gas Pipe Temperature. If a change in
EEV port opening size is needed, the EEV will make a small
adjustment.
The vaporized refrigerant enters the 4-way valve and travels
to the vapor line accumulator. The accumulator will trap any
liquid refrigerant if present to prevent it from entering the
compressor.
The vapor will exit the accumulator and enter the compressor.
This cycle will repeat until the demand for cooling ends.
7
Temperature Sensor Ts
The temperature of the suction gas entering the compressor
is monitored by the Suction Temperature Sensor. Before
stopping operation, the EEV may open to feed more
refrigerant or close to warm up the line.
The demand becomes less as the indoor temperature drops
toward the desired temperature, so the compressor will
reduce speed. When the set temperature is reached, the
compressor and outdoor fan will shut o. The circulating fan
of each indoor unit continues to run.
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