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Technical data
Service manual
404
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
Component functionalities
Symbol Component
Major function
M1C
Compressor
Inverter driven compressor operates in multi-
steps according to T
e
for cooling and T
c
for
heating.
M2C
Compressor
Inverter driven compressor operates in multi-
steps according to T
e
for cooling and T
c
for
heating.
M1F
Fan motor
When outdoor coil is used as condenser, the
fan operation is controlled by T
c
, in heating
mode the fan operates in full steps.
M2F
Fan motor
When outdoor coil is used as condenser, the
fan operation is controlled by T
c
, in heating
mode the fan operates in full steps.
Y1E
Electronic
expansion valve
(upper heat
exchanger)
While in heating operation, PI (proportional
integral) control is applied to keep the outlet
superheat degree of upper heat exchanger
constant.
Y2E
Electronic
expansion valve
(sub-cool)
PI (proportional integral) control to keep outlet
superheat on sub‑cool heat exchanger.
Y3E
Electronic
expansion valve
(lower heat
exchanger)
While in heating operation, PI (proportional
integral) control is applied to keep the outlet
superheat degree of lower heat exchanger
constant.
Y4E
Electronic
expansion valve
(receiver gas
purge)
Used to collect refrigerant to the receiver.
Y5E
Electronic
expansion valve
(liquid cooling)
Controls the amount of refrigerant flowing
through the cooling plate that cools PCB.
Y1S
4‑way valve
Switches operation mode between cooling and
heating.
Y2S
Solenoid valve
(liquid pipe)
Liquid shut-off valve.
Y3S
4‑way valve (high
pressure/low
pressure gas pipe)
This is used to switch dual pressure gas pipe to
high pressure or low pressure.
Y4S
4‑way valve (lower
heat exchanger)
Used to switch heat exchanger as evaporator
or condenser.
Y5S
4‑way valve (upper
heat exchanger)
Used to switch heat exchanger as evaporator
or condenser.
Y11S
Solenoid Valve (oil
separator 1 oil
return)
Controls amount of oil return from oil
separator to compressor.
Summary of Contents for VRV IV+
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