Principle Of Induction Heating (Electric Heat) - Carrier Supra 950MT Operation & Service Manual

Truck refrigeration units with cab command controller

Hide thumbs Also See for Supra 950MT:

Operation and service manual (92 pages)

Operator's manual (42 pages)

Table Of Contents

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

Table of Contents

Heat Mode

When in the heat mode, with neither evaporator calling for cooling, the hot gas solenoid valves 1HGV and 2HGV

could be energized. The main heat valve (MHV) will close, diverting the refrigerant to 1HGV and 2HGV. The nor-

mally closed liquid solenoid valves 1LSV and 2LSV will energize and open.

Flow

The normally closed receiver pressure valve (RPV), situated in the hot gas line to the receiver will open. This

allows the receiver to be pressurized and liquid refrigerant to flow through the drier and sight glass, and pass

through any liquid line solenoid valves, which would be energized. The refrigerant passes through the expansion

valve into the evaporator. At the same time, high-temperature, high-pressure gas enters the evaporator via the

solenoid valves 1HGV and 2HGV to provide required heating. The extra liquid purged from the receiver ensures

maximum heating capacity in low-ambient conditions.

Evaporator

The evaporator fan passes the air over the hot refrigerant pipes and distributes heated air into the cargo space.

Accumulator

The hot gas travels through the suction line check valve into the accumulator where it is drawn back through the

compressor pressure regulating valve (CPR) to begin the process again.

Null Mode

When temperature is achieved in both evaporators, they will go into null mode. The compartment with the highest

set point will then take the lead and revert back to cool/heat cycles.

2.10.2