8 Maintenance and service
Installation manual
25
EAV23DA6V
Daikin Altherma 3 H F
4P606486-1 – 2019.12
Pressure relief valve hose
Check whether the pressure relief valve hose is positioned
appropriately to drain the water. See
Pressure relief valve of the domestic hot water tank
Open the valve.
CAUTION
Water coming out of the valve may be very hot.
▪ Check if nothing blocks the water in the valve or in between
piping. The water flow coming from the relief valve must be high
enough.
▪ Check if the water coming out of the relief valve is clean. If it
contains debris or dirt:
▪ Open the valve until the discharged water does not contain
debris or 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.
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.
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.
Pressure reducing valve
Depending on local water conditions, annual inspection of the
integral line strainer, pressure reducing valve cartridge and seating
may be necessary.
c
a
b
a
Cartridge
b
Strainer
c
Calibration screw
1
Unscrew the plastic cover of the pressure reducing valve.
2
Extract the cartridge with the aid of long nosed pliers to grip the
head of the set screw.
3
Remove the strainer element.
4
Clean the strainer element and cartridge under clean running
water.
5
Replace if the strainer or cartridge are damaged.
6
Refit the strainer, cartridge and cover.
7
If the cartridge has been replaced, calibrate the pressure
reducing valve:
▪ Close the downstream isolating valve (field supply).
▪ Install an Allen key on the calibration screw in the centre of
the plastic cover. Rotate it clockwise to increase the outlet
pressure and anticlockwise to reduce it.
Check for correct operation of the temperature and pressure relief
valve. Manually operate the temperature and pressure relief valve to
ensure free water flow through discharge pipe. Turn knob left.
8.5
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.
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
"4.1.1 To open the indoor unit"
2
Remove the user interface panel. See
3
Lower the switchbox. See
"4.1.2 To lower the switch box on the
7].
4
Remove the tube from the temperature and pressure relief
valve that is located on top of the tank.
5
Remove the temperature and pressure relief valve from the
tank.
