Multi-Zone Technical Overview

TECHNICAL OVERVIEW
PAGE 19
ENGLISH
Temperature Sensors Outdoor Unit
The outdoor unit has two groups of temperature sensors. The rst group of sensors are Liquid and Gas Sensors that are asso-
ciated 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 dierence 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.
Outdoor Coil Cooling
Temperature Sensor
Outdoor Coil
Entering Gas
Temperature
Sensor
Outdoor coil
Heat Mode
Temperature
Sensor
(Defrost)
Module
Heat Sink
Temperature
Sensor
Compressor
Discharge Line
Temperature
Sensor
Compressor
Suction Line
Temperature
Sensor
Outdoor Unit Components
OUTDOOR UNIT TECHNICAL OVERVIEW