11 Maintenance and service
Installer reference guide
80
ERGA04~08DAV3(A) + 08S23DAV
Daikin Altherma – Low temperature split
4P499573-1A – 2018.11
Anti-legionella heater of the domestic hot water tank
It is recommended to remove lime buildup on the anti-legionella
heater to extend its life span, especially in regions with hard water.
To do so, drain the domestic hot water tank, remove the anti-
legionella heater from the domestic hot water tank and immerse in a
bucket (or similar) with lime-removing product for 24 hours.
When reattaching the anti-legionella heater to the domestic hot
water tank, respect the tightening sequence and torque:
1
Clean the flange.
2
Align the gasket with the centre of the flange.
3
Tighten with your hand.
4
Tighten with a torque wrench in 2 steps:
▪ Step 1: 7.5 N∙m
▪ Step 2: 15 N∙m
1
2
3
4
50% 100%
1×
1×
15 N∙m
2×
1
2
3
4
5
6
7
8
1
5
3
7
2
6
4
8
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.
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.
11.4.1
To drain the domestic hot water tank
DANGER: RISK OF BURNING
The water in the tank can be very hot.
Prerequisite:
Turn OFF the unit via the user interface.
Prerequisite:
Turn OFF the respective circuit breaker.
Prerequisite:
Close the cold water supply.
Prerequisite:
Open all the hot water tapping points to allow air to
enter the system.
1
Remove the top panel, the user interface panel and the front
panel.
2
Carefully remove the insulation sheet.
3
Connect a drain hose to the drain valve.
4
Open the drain valve.
b
a
a
Insulation sheet
b
Drain valve
11.5
About cleaning the water filter in
case of trouble
INFORMATION
For yearly maintenance, you do not have to remove the
water filter from the unit to clean it. But in case of trouble
with the water filter, you might have to remove it so that
you can thoroughly clean it. Then you need to do as
follows:
▪
"11.5.1 To remove the water filter" on page 80
▪
"11.5.2 To clean the water filter in case of trouble" on
page 81
▪
"11.5.3 To install the water filter" on page 81
11.5.1
To remove the water filter
Prerequisite:
Turn OFF the unit via the user interface.
Prerequisite:
Turn OFF the respective circuit breaker.
1
The water filter is located behind the switch box. To get access
to it, see:
▪
"7.2.3 To open the indoor unit" on page 30
▪
"7.2.5 To lower the switch box on the indoor unit" on
page 31
2
Close the stop valves of the water circuit.
