About Cleaning The Water Filter In Case Of Trouble; To Remove The Water Filter; To Clean The Water Filter In Case Of Trouble - Rotex HPSU Bi-Bloc Ultra Series Installer's Reference Manual

INFORMATION
It is recommended to perform this maintenance more than
once a year.
Switch box
▪ Carry out a thorough visual inspection of the switch box and look
for obvious defects such as loose connections or defective wiring.
▪ Using an ohmmeter, check if contactors K1M, K2M, K3M and K5M
(depending on your installation) operate correctly. All contacts of
these contactors must be in open position when the power is
turned OFF.
WARNING
If the internal wiring is damaged, it has to be replaced by
the manufacturer, its service agent or similarly qualified
persons.
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 (RKHW).
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:
▪ "11.5.1 To remove the water
▪ "11.5.2 To clean
trouble" [ 4 85]
▪ "11.5.3 To install the water
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:
unit" [ 4 30]
"7.2.3 To open the indoor
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.
RRGA04~08DAV3 + RHBX04+08DA
ROTEX HPSU Bi-Bloc Ultra
4P495262-1B – 2019.10
filter" [ 4 85]
the water filter in case of
filter" [ 4 86]
11 Maintenance and service
a
a
b
a Clip
b Magnetic filter/dirt separator
8 Remove the water filter.
9 Remove the drain hose from the water filter.
CAUTION
Although the water circuit is drained, some water may be
spilled when removing the magnetic filter/dirt separator
from the filter housing. ALWAYS clean up spilled water.
11.5.2

To clean the water filter in case of trouble

1 Remove the water filter from the unit. See
filter" [ 4 85].
the water
CAUTION
To protect the piping connected to the magnetic filter/dirt
separator from damage it is recommended to perform this
procedure with the magnetic filter/dirt separator removed
from the unit.
2 Unscrew the bottom of the water filter housing. Use an
appropriate tool if needed.
CAUTION
Opening the magnetic filter/dirt separator is ONLY required
in case of severe issues. Preferably this action is never to
be done during the complete lifetime of the magnetic filter/
dirt separator.
b
a
a Bottom part to be unscrewed
b Water filter housing
3 Remove the strainer and the rolled‑up filter from the water filter
housing and clean with water.
4 Install the cleaned rolled‑up filter and strainer in the water filter
housing.
INFORMATION
Correctly install the strainer in the magnetic filter/dirt
separator housing using the protrusions.
"11.5.1 To remove
Installer reference guide
85