Indoor Unit - Daikin ERSQ 011AAV1 Service Manual

Refrigerant Circuit
1.2

Indoor Unit

EKHBRD 011/014/016 AA(V1/Y1)
No. in
refrigerant
Symbol
system
diagram
Inverter compressor on
A M1C
R-134a
B Y1R Four way valve
C B1PL Low pressure sensor
D B1PH High pressure sensor
E S1PH High pressure switch
F K2S 2-way valve
G K1E Electronic expansion valve
H K2E Electronic expansion valve
I E1HC Crankcase heater
J M1P DC inverter pump
Thermistor protector water
K Q2L
piping
3 way valve (option for water
L K1S
tank)
1 R3T Liquid thermistor R-410A
2 R6T Discharge thermistor
3 R7T Liquid thermistor R-134a
4 R4T Returning water thermistor
5 R5T Leaving water thermistor
14
Name
Inverter compressor is operated on frequencies between 40 Hz and 210 Hz by using
the inverter. Max. of 30 steps.
Used to switch the operation mode between heating and defrost. Not activated during
heating (opposite concerning outdoor unit).
Used to detect low pressure.
Used to detect high pressure.
In order to prevent the increase of high pressure when a malfunction occurs, this
switch is activated at high pressure of 3.8 MPa or more to stop the compressor
operation.
Used during defrost operation.
Used to regulate the refrigerant flow of R-410A.
Used to regulate the refrigerant flow of R-134a.
Used to prevent migration (when the unit is OFF) and condensation of refrigerant in
the crankcase of compressor.
Used to regulate water flow to achieve a constant ΔT.
Used to protect the water system against high temperatures.
Used to switch over between space heating and domestic hot water.
Subcool calculation.
Used to detect discharge pipe temperature, make the temperature protection control of
compressor, and others.
Subcool calculation.
Used to control and protect the water system.
Used to control and protect the water system.
Major Function
ESIE09-08
Refrigerant Circuit