Daikin Altherma 3 WS EWSAH06UD 9W Series Installer's Reference Manual page 226

14 | Maintenance and service
Installer reference guide
226
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, make sure water quality
still complies with EU directive 2020/2184.
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.
Drain hose
Check the condition and routing of the drain hose. Water must drain appropriately
from the hose. See "7.3.4 To connect the drain hose to the
Fluid pressure
Check whether the fluid pressure is above 1 bar. If it is lower, add fluid.
Pressure relief valve
Open the valve.
CAUTION
Discharge may be very hot.
▪ Check if nothing blocks the fluid in the valve or in between piping. The fluid flow
coming from the relief valve must be high enough.
▪ Check if the fluid coming out from 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 the system and install an additional water filter (preferably a magnetic
cyclone filter).
INFORMATION
It is recommended to perform this maintenance more than once a year.
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.
4
drain" [ 70].
EWSAH/X06UD
Daikin Altherma 3 WS
4P675765-1 – 2022.04