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14 Technical data
14.2
Components
14.2.1
Components: Indoor unit
d
b
c
a
z
x
y
n
w
v
n
o
u
t
s
r
q
a Space heating cooling out
b Shut-off valves (accessory)
Allows isolation of the indoor unit water circuit side from the
residential water circuit side.
c Domestic hot water out
d Refrigerant liquid connection R410A
e Refrigerant gas connection R410A
f Domestic hot water in
g Fill valve (accessory)
h Space heating cooling in
i Expansion vessel (10 l)
j Pressure relief valve
Prevents excessive water pressure in the water circuit by
opening at 3 bar.
k Water filter
Removes dirt from the water to prevent damage to the pump or
blockage of the heat exchanger.
l Heat exchanger
m Water pump
Circulates the water in the water circuit.
n Thermistors
Determines the water and refrigerant temperature at various
points in the circuit.
o Drain caps
p Tank thermistors (180 l/260 l)
q Domestic hot water tank drain valve
Empties the full tank.
r Switch box
Contains the main electronic and electrical parts of the indoor
unit.
s Backup heater thermal protector
The protector activates when the temperature of the backup
heater becomes too high.
t Drain collector (EHVX models only)
u Drain gutter (EHVX models only)
Installer reference guide
68
e
b
g
f
h
i
i
dd
z
j
x
k
y
l
m
n
n
o
p (180 l)
cc
aa
p (260 l)
bb
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.
14.2.2
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
ERHQ011~016BA + ERLQ011~016CA + EHVH/X16S18+26CA
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
Daikin Altherma - Low Temperature Split
4P313777-1C – 2012.11
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