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11 Maintenance and service
Installer reference guide
65
ERLQ004~008CA + 08S18CA3VF
Daikin Altherma low temperature split
4P3662261 – 2014.01
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.
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,
it must be ensured that the water quality remains compliant
with EU directive 98/83 EC.
Anode
No maintenance or replacement required.
11.2.1
To drain the domestic hot water tank
1
Switch OFF the power supply.
2
Turn OFF the cold water supply.
3
Open the hot water taps.
4
Open the drain valve.
11.3
Checklist for yearly maintenance
of the outdoor unit
Check the following at least once a year:
▪ Outdoor unit 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.
11.4
To drain the domestic hot water
tank
1
Open the front panel.
2
The drain hose is located at the right side of the unit. Cut the tie
wraps or tape and bring the flexible drain hose forward.
INFORMATION
To drain the tank, all the hot water tapping points need to
be opened to allow air to enter the system.
11.5
To drain the flowthrough vessel
and backup heater
1
Open the front panel.
2
The drain hose is located at the left side of the unit. Cut the tie
wraps or tape and bring the flexible drain hose forward.
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