Daikin Altherma 3 GEO Series Installer's Reference Manual page 213

EGSAH/X06+10UDA9W
Daikin Altherma 3 GEO
4P598592-1A – 2019.12
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 "6.3.4 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.
▪ 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.
13 Maintenance and service
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4
drain" [ 62].
Installer reference guide
213