Daikin VRV IV+ Service Manual page 150

6 Technical data
Component functionalities
Symb Component Major function
ol
M1C Compressor Inverter driven compressor operates in
multi-steps according to T
and T
M2C Compressor Inverter driven compressor operates in
multi-steps according to T
and T
M1F Fan motor When outdoor coil is used as condenser,
the fan is operated maintain T
heating mode operates in full steps.
M2F Fan motor When outdoor coil is used as condenser,
the fan is operated maintain T
heating mode operates in full steps.
Y1E Electronic In cooling: Fully open when compressor
expansion valve runs.
(main)
In heating: PI (proportional integral)
control to keep superheat constant.
Y2E Electronic PI (proportional integral) control to keep
expansion valve outlet superheat on sub‑cool heat
(sub-cool) exchanger.
Y3E Electronic Controls the amount of refrigerant
expansion valve flowing through the cooling plate that
(liquid cooling) cools PCB.
Y4E Electronic Controls refrigerant flow through heat
expansion valve exchanger of the storage vessel during
(storage vessel) heating (used as sub-condenser) and
– only for RYYQ- during defrost (used as main
U evaporator). Not used in cooling mode.
Y1S 4‑way valve Switches operation mode between
cooling and heating.
Y2S Solenoid valve Controls amount of oil return from
(accumulator oil accumulator to compressor.
return)
Y3S Solenoid valve Controls amount of oil return from oil
(oil separator 1 separator to compressor.
oil return)
Y4S Solenoid valve Controls amount of oil return from oil
(oil separator 2 separator to compressor.
oil return)
Y5S 4‑way valve Switch between outdoor heat exchanger
(sub) – only for and Phase Changing Material (PCM)
RYYQ-U and vessel (for RYYQ-U). Switch the
RYMQ-U condition of outdoor unit heat exchanger
as condenser or evaporator (for RYMQ-
U)
S1NP Pressure sensor Detects discharge pressure. In cooling:
H (high) mainly to control fan speed of outdoor
unit. In heating: mainly to control
compressor capacity.
S1NP Pressure sensor Detects suction pressure. In cooling:
L (low) mainly to control compressor capacity. In
heating: mainly for the calculation of
suction superheat.
S1PH Pressure switch Prevents excess high pressure during
(high, M1C malfunction. Stops operation when
discharge) triggered.
S2PH Pressure switch Prevents excess high pressure during
(high, M2C malfunction. Stops operation when
discharge) triggered.
R1T Thermistor (air) Detects ambient temperature. Used for
correction of discharge temperature and
judging defrost condition.
Service manual
150
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Symb Component Major function
ol
R21T Thermistor (M1C Detects discharge temperature of the
discharge) compressor
R22T Thermistor (M2C Detects discharge temperature of the
discharge) compressor
R3T Thermistor Detects gas inlet temperature of
(accumulator) accumulator. Mainly used to keep
suction superheat constant during
heating operation.
R4T Thermistor (heat Detects liquid pipe temperature of
exchanger, liquid outdoor coil. Mainly used to determine
pipe) sub‑cool during auto-charge, test-run,
leak test and over-charge judgement
during test-run.
R5T Thermistor Detects liquid pipe temperature of
(subcool, liquid outdoor unit to indoor units. Mainly used
pipe) to calculate sub-cool.
R6T Thermistor (heat Detects sub‑cool heat exchanger outlet
exchanger, gas temperature on sub-cool line. Used to
pipe) keep the sub‑cool heat exchanger outlet
superheat constant.
R7T Thermistor (Heat Detects liquid pipe temperature of
Exchanger, De- outdoor heat exchanger. Used to judge
icer) defrost ON and defrost OFF operation.
R8T Thermistor (M1C Detects compressor body temperature.
body) Acts as safety for overheated operation
of compressor.
R9T Thermistor (M2C Detects compressor body temperature.
body) Acts as safety for overheated operation
of compressor.
Liquid service Service port – liquid pipe to field liquid
port piping
Gas service port Service port – gas pipe to field gas
piping
Refrigerant Service port
charge port
Equalizing pipe Service port – equalizing pipe to other
port – only for RYMQ-U unit
RYMQ-U
Accumulator Serves as a storage for not-required
refrigerant at partial capacity. Prevents
liquid back to the compressor.
Pressure During transportation, storage or stand-
regulating valve 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 Sub-cools liquid refrigerant in cooling
heat exchanger mode.
(subcool heat
exchanger)
Heat sink (PCB) Cools the PCB, through cooling plate,
cooled by refrigerant.
Storage vessel – Phase Changing Material (PCM) Vessel
only for RYYQ-U stores heat during heating cycle. When
absorbs heat, PCM becomes liquid.
During defrost, PCM Vessel is used as
evaporator and PCM becomes solid
when releases heat.
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07