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Refrigerant Circuit
ESIE09-08A
14
Refrigerant Circuit
1.2
Indoor Unit
EKHBRD 011/014/016 AA/AB/AC(V1/Y1)
No. in
refrigerant
system
diagram
Symbol
Name
Major Function
A
M1C
Inverter compressor on R-134a
Inverter compressor is operated on frequencies between 40 Hz and 210 Hz by using the
inverter. Max. of 30 steps.
B
Y1R
Four way valve
Used to switch the operation mode between heating and defrost. Not activated during heating
(opposite concerning outdoor unit).
C
B1PL
Low pressure sensor
Used to detect low pressure.
D
B1PH
High pressure sensor
Used to detect high pressure.
E
S1PH
High pressure switch
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.
F
K2S
2-way valve
Used during defrost operation.
G
K1E
Electronic expansion valve
Used to regulate the refrigerant flow of R-410A.
H
K2E
Electronic expansion valve
Used to regulate the refrigerant flow of R-134a.
I
E1HC
Crankcase heater
Used to prevent migration (when the unit is OFF) and condensation of refrigerant in the
crankcase of compressor.
J
M1P
DC inverter pump
Used to regulate water flow to achieve a constant
Δ
T
.
K
Q2L
Thermistor protector water
piping
Used to protect the water system against high temperatures.
L
K1S
3 way valve (option for water
tank)
Used to switch over between space heating and domestic hot water.
1
R3T
Liquid thermistor R-410A
Subcool calculation.
2
R6T
Discharge thermistor
Used to detect discharge pipe temperature, make the temperature protection control of
compressor, and others.
3
R7T
Liquid thermistor R-134a
Subcool calculation.
4
R4T
Returning water thermistor
Used to control and protect the water system.
5
R5T
Leaving water thermistor
Used to control and protect the water system.
Summary of Contents for ALTHERMA HT ERSQ 011 AA
Page 2: ......
Page 7: ...ESIE09 08A Table of Contents v 1 3 Service Tools 283 Index i Drawings Flow Charts iii...
Page 16: ...Model Names of Indoor Outdoor Units Tanks ESIE09 08A 4 General Information...
Page 28: ...Refrigerant Circuit ESIE09 08A 16 Refrigerant Circuit EKHBRD 011 014 016 AB AC V1 Y1...
Page 40: ...Functional Parts Layout ESIE09 08A 28 Refrigerant Circuit...
Page 63: ...ESIE09 08A PCB Layout for EKHBRD 011 014 016 AA AB AC V1 Y1 Refrigerant Circuit 51...
Page 64: ...PCB Layout for EKHBRD 011 014 016 AA AB AC V1 Y1 ESIE09 08A 52 Refrigerant Circuit...
Page 125: ...ESIE09 08A Field Setting Test Operation 113...
Page 232: ...Troubleshooting by Indication on the Remote Controller ESIE09 08A 222 Troubleshooting...
Page 237: ...ESIE09 08A Piping Diagrams Appendix 227 EKHBRD 011 014 016 AB AC V1 Y1...
Page 250: ...Wiring Diagrams ESIE09 08A 240 Appendix EKHBRD 011 014 016 AB AC V1...
Page 251: ...ESIE09 08A Wiring Diagrams Appendix 241...
Page 256: ...Wiring Diagrams ESIE09 08A 246 Appendix EKHBRD 011 014 016 AB AC Y1...
Page 257: ...ESIE09 08A Wiring Diagrams Appendix 247...
Page 260: ...Wiring Diagrams ESIE09 08A 250 Appendix...