11 | Maintenance and service
Installer reference guide
194
ERGA04~08DAV3(A) + EHBH/X04+08DA*V7
Daikin Altherma 3 R W
4P618958-1 – 2020.03
Booster heater of the domestic hot water tank
INFORMATION
Only for wall-mounted units equipped with a domestic hot water tank with a built-in
electrical booster heater (EKHW).
It is recommended to remove lime buildup on the booster heater to extend its life
span, especially in regions with hard water. To do so, drain the domestic hot water
tank, remove the booster heater from the domestic hot water tank and immerse in
a bucket (or similar) with lime-removing product for 24 hours.
11.5 About cleaning the water filter in case of trouble
INFORMATION
For yearly maintenance, you do not have to remove the water filter from the unit to
clean it. But in case of trouble with the water filter, you might have to remove it so
that you can thoroughly clean it. Then you need to do as follows:
▪ "11.5.1To remove the water filter"[4194]
▪ "11.5.2To clean the water filter in case of trouble"[4195]
▪ "11.5.3To install the water filter"[4196]
11.5.1 To remove the water filter
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
1 The water filter is located behind the switch box. To get access to it, see:
"7.2.3To open the indoor unit"[468]
2 Close the stop valves of the water circuit.
3 Close the valve (if equipped) of the water circuit towards the expansion vessel.
4 Remove the cap on the bottom of the magnetic filter/dirt separator.
5 Connect a drain hose to the bottom of the water filter.
6 Open the valve on the bottom of the water filter to drain water from the
water circuit. Collect the drained water in a bottle, sink,… using the installed
drain hose.
7 Remove the 2 clips that fix the water filter.
a Clip
b Magnetic filter/dirt separator
8 Remove the water filter.
9 Remove the drain hose from the water filter.
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