11 Maintenance and service
Installer reference guide
71
EPGA11~ EA9W
Daikin Altherma – Low temperature split
4P556075-1 – 2019.02
▪ Dirty water coming out of the relief valve:
▪ open the valve until the discharged water does not contain dirt
anymore
▪ flush and clean the complete tank, including the piping between
the relief valve and cold water inlet.
To make sure this water originates from the tank, check after a tank
heat up cycle.
It is recommended to do this maintenance more frequently.
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 and K3M
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.
Descaling
Depending on water quality and set temperature, scale can deposit
on the heat exchanger inside the domestic hot water tank and can
restrict heat transfer. For this reason, descaling of the heat
exchanger may be required at certain intervals.
Chemical disinfection
If the applicable legislation requires a chemical disinfection in
specific situations, involving the domestic hot water tank, please be
aware that the domestic hot water tank is a stainless steel cylinder.
We recommend to use a non-chloride based disinfectant approved
for use with water intended for human consumption.
NOTICE
When using means for descaling or chemical disinfection,
it must be ensured that the water quality remains compliant
with EU directive 98/83 EC.
11.4.1
To drain the domestic hot water tank
DANGER: RISK OF BURNING
The water in the tank can be very hot.
Prerequisite:
Stop the unit operation (via the user interface,
operation switch, …).
Prerequisite:
Turn OFF the respective circuit breaker.
Prerequisite:
Close the cold water supply.
Prerequisite:
Open all the hot water tapping points to allow air to
enter the system.
1
Remove the top panel, the user interface panel and the front
panel.
2
Lower the switch box.
3
Remove the stop from the access point to the tank.
4
Use a drain hose and a pump to drain the tank via the access
point.
a
Access point to the tank
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 filter" on page 71
▪
"11.5.2 To clean the water filter in case of trouble" on
page 71
▪
"11.5.3 To install the water filter" on page 72
11.5.1
To remove the water filter
Prerequisite:
Stop the unit operation (via the user interface,
operation switch, …).
Prerequisite:
Turn OFF the respective circuit breaker.
1
The water filter is located behind the switch box. To get access
to it, see:
▪
"7.2.3 To open the indoor unit" on page 23
▪
"7.2.5 To lower the switch box on the indoor unit" on
page 24
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
b
a
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 spilled water.
11.5.2
To clean the water filter in case of trouble
1
Remove the water filter from the unit. See
