Yearly Maintenance Indoor Unit: Instructions - Daikin R32 Split Series Installer's Reference Manual

13.2.2 Yearly maintenance indoor unit: instructions

EKHWET90~120BAV3
R32 Split series – Domestic hot water tank
4P680077-1 – 2021.11
▪ Anode
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 contactor K3M operates correctly. All contacts of
this contactor 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.
Booster heater of the domestic hot water tank
It is recommended to remove lime buildup on the booster heater to extend its life
span, especially in regions with hard water. To do so, drain the domestic hot water
tank, remove the booster heater from the domestic hot water tank and immerse in
a bucket (or similar) with lime-removing product for 24 hours.
NOTICE
The booster heater sealing must be replaced after every check. Tighten the booster
heater screws to 10 N•m of torque.
Anode
To check the integrity of the magnesium anode drain the domestic hot water tank,
remove the booster heater from the domestic hot water tank and check the
anode. If corrosion affects more than 2/3 of the anode surface, please replace it.
13 Maintenance and service
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Installer reference guide
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