Components: Indoor Unit; Components: Switch Box (Indoor Unit) - Daikin Altherma ERLQ011-014-016CA Installer's Reference Manual

14 Technical data
14.4.2

Components: Indoor unit

10+12 HP
d b c a
a Switch box
Contains the main electronic and electrical parts of the
indoor unit.
b User interface (optional)
c Manometer
Allows readout of the water pressure in the water circuit.
d Air purge valve
Remaining air in the water circuit will be automatically
removed via the air purge valve.
e Expansion vessel (10 l)
f Flow sensor
Gives feedback to the interface about the actual flow. Based
on this information (and other), the interface adjusts the
pump speed.
g Heat exchanger
h Water pump
Circulates the water in the water circuit.
i Water filter
Removes dirt from the water to prevent damage to the pump
or blockage of the heat exchanger.
j Pressure relief valve
Prevents excessive water pressure in the water circuit by
opening at 3 bar.
k Refrigerant gas connection R410A
l Refrigerant liquid connection R410A
m Water inlet connection
n Drain and fill valves
o Shut-off valves (accessory)
Allows isolation of the indoor unit water circuit side from the
residential water circuit side.
p Water outlet connection
q Thermistors
Determines the water and refrigerant temperature at various
points in the circuit.
Installer reference guide
94
r
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u
14.4.3
a
s
b r
c
q
f
o
n
m
l
a
b
c
d
e
f
g
h
i
j
k
l
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Backup heater thermal fuse
The fuse is blown when the temperature becomes higher
than the backup heater thermal protector temperature.
Backup heater thermal protector
The protector activates when the temperature of the backup
heater becomes too high.
Backup heater
Provides additional heating in case of cold outdoor
temperatures. Also serves
malfunctioning of the outdoor unit.
Air valve

Components: Switch box (indoor unit)

a b
Q1L
TR1
FU1
A1P
X6Y
X6YA
X5M
X2M
X1M
Backup heater thermal protector Q1L
Transformer TR1
Terminals for backup heater X6M/X7M (*9W models only)
Backup heater contactors K1M, K2M and K5M
Booster heater contactor K3M (only for installations with a domestic
hot water tank)
Connectors X6YA/X6YB/X6Y
Backup heater circuit breaker F1B
Booster heater circuit breaker F2B. (Only for installations with
domestic hot water tank)
Terminal block X2M (high voltage)
Terminal block X4M. (Only for installations with domestic hot water
tank)
Terminal block X1M (to outdoor unit)
Cable tie mountings
Digital I/O PCB A4P (only for installations with solar kit or digital I/O
PCB kit)
Demand PCB for power limitation
Terminal block X5M (low voltage)
Socket X13A, receives the K3M connector. (Only for installations with
domestic hot water tank)
Main PCB A1P
Socket X9A, receives the thermistor connector. (Only for installations
with domestic hot water tank)
PCB fuse FU1
ERHQ+ERLQ011~016 + EHBH/X11+16CB
Daikin Altherma – Low temperature split
as backup in case of
c c
X6M X6M X7M X7M
d
K1M K1M K2M K2M
d
e
K5M K5M K3M K3M
d
p
F1B F2B
g
h
X6YB
i
k
j
X4M
4P384974-1 – 2015.01