Daikin Altherma 3 H HT EPRA14DAW1, Installer'S Reference Manual

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12 | Maintenance and service
Installer reference guide
213
EPRA14~W1 + ETVH/9W(G)
Daikin Altherma 3 H HT F
4P587502-1A – 2020.01
▪ The water flow coming from the relief valve is high enough, no blockage of the
valve or in between piping is suspected.
▪ Dirty water coming out of the relief valve:
- open the valve until the discharged water does NOT contain dirt anymore
- flush the system
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
"6.4.4 To connect the drain hose to the drain" [
4
72].
Pressure relief valve of the domestic hot water tank (field supply)
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.