Daikin VRV IV+ Service Manual page 406

6 | Technical data
Service manual
406
Symbol Component
R8T Thermistor (upper
heat exchanger,
gas pipe)
R9T Thermistor (lower
heat exchanger,
gas pipe)
R10T Thermistor
(suction)
R11T Thermistor (heat
exchanger, de‑icer)
R12T Thermistor
(compressor
suction)
R13T Thermistor
(receiver gas
purge)
R15T Thermistor (M1C
body)
Liquid service port Service port – liquid pipe to field liquid piping
Dual gas service
port
Low pressure gas
service port
Refrigerant charge
port
Accumulator
Receiver
Pressure regulating
valve
Double-tube heat
exchanger
(sub‑cool heat
exchanger)
Heat sink (PCB)
Major function
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.
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.
Detects suction pipe temperature.
Detects liquid pipe temperature of outdoor
heat exchanger. Used to judge defrost ON and
defrost OFF operation.
Detects compressor suction pipe temperature.
Detects gas pipe temperature of receiver.
Detects compressor body temperature. Acts as
safety for overheated operation of
compressor.
Service port – dual gas pipe to field dual gas
piping
Service port – low pressure gas pipe to field
low pressure gas piping.
Service port
Serves as a storage for not-required refrigerant
at partial capacity. Prevents liquid back to the
compressor.
Serves as a liquid receiver.
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.
Sub-cools liquid refrigerant in cooling mode.
Cools the PCB, through cooling plate, cooled by
refrigerant.
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05