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v Backup heater
Provides
additional
heating
temperatures. Also serves as backup in case of malfunctioning
of the outdoor unit.
w Manometer
Allows readout of the water pressure in the water circuit.
x Flow sensor
Gives feedback to the interface about the actual flow. Based on
this information (and other), the interface adjusts the pump
speed.
y Air purge valve
Remaining air in the water circuit will be automatically removed
via the air purge valve.
z 3-way valve
Controls whether the water is used for space heating, or the
domestic hot water tank.
aa User interface (accessory)
bb Drain flexible (EHVX models only)
cc Drain flexible pressure relief valve
dd Air valve
INFORMATION
Some components are not directly accessible when
removing the top plate and/or the front plates. It could be
necessary to remove the isolation of the tank by sliding it
backward of the tank. The components in the switch box
are accessible by removing the switch box cover.
15.3.4
Components: Switch box (indoor unit)
b
Q1L
A7P
a
TR1
o
FU1
A1P
n
m
X6Y
X6YA
X5M
X2M
l
k
X1M
j
a Pump PCB A7P (Inverter PCB)
b Backup heater thermal protector Q1L
c Transformer TR1
d Terminals for backup heater X6M/X7M (*9W models only)
e Backup heater contactors K1M, K2M and K5M
f Connectors X6YA/X6YB/X6Y
g Backup heater circuit breaker F1B
h Terminal block X2M (high voltage)
i Terminal block X1M (to outdoor unit)
j Cable tie mountings
k Digital I/O PCB A4P (only for installations with solar kit or digital
I/O PCB kit)
l Demand PCB for power limitation
ERLQ004~008CAV3 + EHVH/X04+08S18CA + EHVH/X08S26CA
Daikin Altherma - Low Temperature Split
4P313775-1C – 2012.11
in
case
of
cold
outdoor
c
d
d
X6M
X7M
X7M
K1M
K2M
K2M
e
e
e
K5M
f
F1B
g
X6YB
h
X3M
i
m Terminal block X5M (low voltage)
n Main PCB A1P
o PCB fuse FU1
15 Technical data
Installer reference guide
81
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