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NOTICE: Risk of electrostatic discharge
Before performing any maintenance or service work, touch
a metal part of the unit in order to eliminate static electricity
and to protect the PCB.
14.3
Outdoor unit
14.3.1
Opening the outdoor unit
See
"9.2.2 To open the outdoor unit" on
14.3.2
Checklist for yearly maintenance of the
outdoor unit
Check the following at least once a year:
▪ Heat exchanger
▪ Water pressure
▪ Water filter
▪ Water pressure relief valve
▪ Pressure relief valve of the domestic hot water tank
▪ Switch box
▪ Freeze protection valves
▪ Vacuum breaker
Heat exchanger
The heat exchanger of the outdoor unit can get blocked up due to
dust, dirt, leaves, etc. It is recommended to clean the heat
exchanger yearly. A blocked heat exchanger can lead to too low
pressure or too high pressure leading to worse performance.
Water pressure
Keep water pressure above 1 bar. If it is lower, add water.
Water filter
Clean the water filter.
NOTICE
Handle the water filter with care. Do NOT use excessive
force when you reinsert the water filter so as NOT to
damage the water filter mesh.
1
3
2
4
5
Water pressure relief valve
Open the valve and check if it operates correctly. The water may be
very hot!
Checkpoints are:
▪ The water flow coming from the relief valve is high enough, no
blockage of the valve or in between piping is suspected.
EJHA04AAV3 + NHY2KOMB28+32AA
Daikin Altherma H Hybrid
4P556861-1A – 2019.05
page 30.
14 Maintenance and service
▪ Dirty water coming out of the relief valve:
▪ open the valve until the discharged water does NOT contain dirt
anymore
▪ flush the system and install an additional water filter (a
magnetic cyclone filter is preferable).
It is recommended to do this maintenance more frequently.
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.
WARNING
If the internal wiring is damaged, it has to be replaced by
the manufacturer, its service agent or similarly qualified
persons.
Freeze protection valves
▪ Replace the freeze protection valves every 3~7 years (depending
on the water quality).
▪ Replace the freeze protection valves if they do not close properly
anymore. Example: When they opened and dirt got stuck inside
the valves.
Example: Replace the freeze protection valve inside the outdoor
unit as follows:
a
b1
a
Connection piece for freeze protection valve
b1
Old freeze protection valve
b2
New freeze protection valve
Vacuum breaker
Dismantle the vacuum breaker and clean it's cartridge with water.
In case of malfunction: replace the vacuum breaker.
a
2
1
b2
Installer reference guide
83
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