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DANGER: RISK OF BURNING
NOTICE: Risk of electrostatic discharge
Before performing any maintenance or service work, touch
a metal part of the unit in order to eliminate static electricity
and to protect the PCB.
11.1.1
Opening the indoor unit
CAUTION
The front panel is heavy. Be careful NOT to jam your
fingers when opening or closing the unit.
You just need to remove the front panel and remove the expanded
polystyrene front cover of the unit to gain access to most parts which
need maintenance. In rare cases, you may also need to remove the
switch box.
11.2
Checklist for yearly maintenance for
indoor unit
Check the following at least once a year:
▪ Water pressure
▪ Water filter
▪ Water pressure relief valve
▪ Relief valve hose
▪ Pressure relief valve of the domestic hot water tank
▪ Switch box
▪ Descaling
▪ Chemical disinfection
▪ Anode
Water pressure
Check whether the water pressure is above 1 bar. If it is lower, add
water.
Water filter
Clean the water filter.
NOTICE
Handle the water filter with care. Do NOT use excessive
force when you reinsert the water filter so as NOT to
damage the water filter mesh.
1
3
2
4
5
Water pressure relief valve
Open the valve and check the correct operation. Water may be very
hot!
Checkpoints are:
ERHQ011~016BA + ERLQ011~016CA + EHVH/X16S18+26CA
Daikin Altherma - Low Temperature Split
4P313777-1C – 2012.11
11 Maintenance and service
▪ Water flow coming from the relief valve is high enough, no
blockage of the valve or in between piping is suspected.
▪ Water coming out from the relief valve and contains debris or dirt:
▪ open the valve untill the discharged water does not contain dirt
anymore
▪ flush the system and install an additional water filter (a
magnectic cyclone filter is preferably).
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.
Pressure relief valve hose
Check whether the pressure relief valve hose is positioned
appropriately to drain the water. See "7.3.2 To connect the pressure
relief valve to the drain" on page 26.
Relief valve of the domestic hot water tank (field supply)
Open the valve and check the correct operation. Water may be very
hot!
Checkpoints are:
▪ Water flow coming from the relief valve is high enough, no
blockage of the valve or in between piping is suspected.
▪ Water coming out from the relief valve and contains debris or dirt:
▪ open the valve untill 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 for correct operation of contactors
K1M, K2M, K3M and K5M (depending on your installation). 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
containing an aluminium anode. 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.
Installer reference guide
61
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