Daikin VRV IV+ Service Manual page 405

REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
Symbol Component
Y12S Solenoid Valve (oil
separator 2 oil
return)
S1NPH Pressure sensor
(high)
S1NPL Pressure sensor
(low)
S1PH Pressure switch
(high, M1C
discharge)
S2PH Pressure switch
(high, M2C
discharge)
R1T Thermistor (air)
R21T Thermistor (M1C
discharge)
R22T Thermistor (M2C
discharge)
R3T Thermistor (liquid,
main)
R4T Thermistor (upper
heat exchanger,
liquid pipe)
R5T Thermistor (lower
heat exchanger,
liquid pipe)
R6T Thermistor
(sub‑cool heat
exchanger, gas
pipe)
R7T Thermistor
(sub‑cool heat
exchanger, liquid
pipe)
Major function
Controls amount of oil return from oil
separator to compressor.
Detects discharge pressure. In cooling: mainly
to control fan speed of outdoor unit. In
heating: mainly to control compressor
capacity.
Detects suction pressure. In cooling: mainly to
control compressor capacity. In heating:
mainly for the calculation of suction superheat.
Prevents excess high pressure during
malfunction. Stops operation when triggered.
Prevents excess high pressure during
malfunction. Stops operation when triggered.
Detects ambient temperature. Used for
correction of discharge temperature and
judging defrost condition.
Detects discharge temperature of the
compressor
Detects discharge temperature of the
compressor
Used to detect pipe temperature of receiver
inlet.
This detects temperature of liquid pipe
between the air heat exchanger and upper
heat exchanger electronic expansion valve.
Used to make judgements on recovering or
discharging refrigerant to the refrigerant
regulator.
This detects temperature of liquid pipe
between the air heat exchanger and lower
heat exchanger electronic expansion valve.
Used to make judgements on recovering or
discharging refrigerant to the refrigerant
regulator.
Detects sub‑cool heat exchanger outlet
temperature on injection line. Used to keep
the sub‑cool heat exchanger outlet superheat
constant.
Detects liquid pipe temperature of outdoor
unit to indoor units. Mainly used to calculate
sub-cool.
6 Technical data
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Service manual
405