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Technical data
Service manual
406
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
Symbol Component
Major function
R8T
Thermistor (upper
heat exchanger,
gas pipe)
This detects temperature of gas pipe for air
heat exchanger. Used to exercise the constant
control of superheated degree when an
evaporator is used for outdoor unit heat
exchanging.
R9T
Thermistor (lower
heat exchanger,
gas pipe)
This detects temperature of gas pipe for air
heat exchanger. Used to exercise the constant
control of superheated degree when an
evaporator is used for outdoor unit heat
exchanging.
R10T
Thermistor
(suction)
Detects suction pipe temperature.
R11T
Thermistor (heat
exchanger, de‑icer)
Detects liquid pipe temperature of outdoor
heat exchanger. Used to judge defrost ON and
defrost OFF operation.
R12T
Thermistor
(compressor
suction)
Detects compressor suction pipe temperature.
R13T
Thermistor
(receiver gas
purge)
Detects gas pipe temperature of receiver.
R15T
Thermistor (M1C
body)
Detects compressor body temperature. Acts as
safety for overheated operation of
compressor.
Liquid service port Service port – liquid pipe to field liquid piping
Dual gas service
port
Service port – dual gas pipe to field dual gas
piping
Low pressure gas
service port
Service port – low pressure gas pipe to field
low pressure gas piping.
Refrigerant charge
port
Service port
Accumulator
Serves as a storage for not-required refrigerant
at partial capacity. Prevents liquid back to the
compressor.
Receiver
Serves as a liquid receiver.
Pressure regulating
valve
During transportation, storage or stand-still, if
pressure > 4.0 MPa, this valve opens to
balance pressure inside the unit, to prevent
any equipment damage due to pressure
increase.
Double-tube heat
exchanger
(sub‑cool heat
exchanger)
Sub-cools liquid refrigerant in cooling mode.
Heat sink (PCB)
Cools the PCB, through cooling plate, cooled by
refrigerant.
Summary of Contents for VRV IV+
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