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Temperature Sensors - Haier 2U18MS2VHB Service Manual

Ductless multi-split heat pump, outdoor/indoor, wall mount - highwall, 2'x2' compact cassette, 3'x3' large cassette, slim duct, mid-static ducted, medium static ducted, console
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Temperature Sensors

The outdoor unit has two groups of temperature sensors. The first group of sensors are Liquid and Gas Sensors that are
associated with each indoor unit EEV. These sensors monitor the leaving liquid temperature from the EEV and the returning
Suction Vapor temperature from the indoor units. The difference between the two temperatures is used to calculate the
operational suction vapor superheat level of each calling indoor unit. These sensors are labeled Tc1 and Tc2 on the schematic
drawing. They plug into the ECU unit on a series of plugs located near the center of the circuit board.
The second group of sensors monitor key temperatures in the refrigeration circuit and outdoor unit. The sensors associated
with the refrigeration circuit include compressor discharge line temperature, compressor suction line temperature, outdoor
coil entering gas temperature, outdoor coil temperature cooling mode and outdoor coil heat mode temperature (Defrost).
The ambient outdoor air temperature is monitored by sensor Ta. The temperature of the heat sink attached to the Module
Board is monitored by Sensor Tm. These sensors connect to the ECU via plugs CN-7 and CN-14.
Compressor
Compressor
Discharge Line
Discharge Line
Temperature
Temperature
Sensor
Sensor
Components
Outdoor Coil Cooling
Outdoor Coil Cooling
Temperature Sensor
Temperature Sensor
Outdoor coil
Outdoor coil
Heat Mode
Heat Mode
Temperature
Temperature
Sensor
Sensor
(Defrost)
(Defrost)
OUTDOOR TECHNICAL OVERVIEW
Outdoor Coil
Outdoor Coil
Entering Gas
Entering Gas
Temperature
Temperature
Sensor
Sensor
Module
Module
Heat Sink
Heat Sink
Temperature
Temperature
Sensor
Sensor
Compressor
Compressor
Suction Line
Suction Line
Temperature
Temperature
Sensor
Sensor
B-7

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