Daikin Altherma ERHQ011-014-016BA - Components: Indoor Unit; Components: Switch Box (Indoor Unit)

14 Technical data
Installer reference guide
94
ERHQ+ERLQ011~016 + EHBH/X11+16CB
Daikin Altherma – Low temperature split
4P384974-1 – 2015.01
14.4.2 Components: Indoor unit
a
b
c
ab cd
10+12 HP
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.
r Backup heater thermal fuse
The fuse is blown when the temperature becomes higher
than the backup heater thermal protector temperature.
s Backup heater thermal protector
The protector activates when the temperature of the backup
heater becomes too high.
t Backup heater
Provides additional heating in case of cold outdoor
temperatures. Also serves as backup in case of
malfunctioning of the outdoor unit.
u Air valve
14.4.3 Components: Switch box (indoor unit)
X4M
F1B F2B
TR1
X5M
X2M
X6Y
X6YA X6YB
X1M
FU1
A1P
Q1L
K1M
K1M
X6M
X6M X7MX7M
K2M
K2M
K5M
K5M
K3M
K3M
d
d
a b c c
d
e
p
g
h
i
k
j
q
f
s
r
o
n
m
l
a Backup heater thermal protector Q1L
b Transformer TR1
c Terminals for backup heater X6M/X7M (*9W models only)
d Backup heater contactors K1M, K2M and K5M
e Booster heater contactor K3M (only for installations with a domestic
hot water tank)
f Connectors X6YA/X6YB/X6Y
g Backup heater circuit breaker F1B
h Booster heater circuit breaker F2B. (Only for installations with
domestic hot water tank)
i Terminal block X2M (high voltage)
j Terminal block X4M. (Only for installations with domestic hot water
tank)
k Terminal block X1M (to outdoor unit)
l Cable tie mountings
m Digital I/O PCB A4P (only for installations with solar kit or digital I/O
PCB kit)
n Demand PCB for power limitation
o Terminal block X5M (low voltage)
p Socket X13A, receives the K3M connector. (Only for installations with
domestic hot water tank)
q Main PCB A1P
r Socket X9A, receives the thermistor connector. (Only for installations
with domestic hot water tank)
s PCB fuse FU1