124
04. Insert a hose into the DHW cylinder. Drain with a
pump.
!
Please note
Negative pressure in the DHW cylinder can
cause material damage.
The air vent valve must always be open
when draining the DHW cylinder with a
suction pump.
05. To prevent contaminants entering the pipework:
Separate the DHW cylinder from the pipework.
06. Remove loose deposits with a high pressure
cleaner.
!
Please note
Water splashes can cause electrical faults.
Protect the electrical components of the
heat pump from water splashes.
!
Please note
Pointed or sharp cleaning tools will damage
the cylinder interior.
Only use plastic cleaning equipment to
clean the inside.
07. Use a chemical cleaning agent to remove hard
deposits that cannot be removed with a high pres-
sure cleaner.
Danger
Cleaning agent residues can result in poi-
soning.
Fully drain all cleaning agent.
Always observe the information provided
by the cleaning agent manufacturer.
!
Please note
Cleaning agents containing hydrochloric
acid will attack the DHW cylinder material.
Only use pH-neutral cleaning agents.
08. Flush the DHW cylinder thoroughly after cleaning.
09. Refit protective magnesium anode with a new
gasket.
10. Open valves. Fill the DHW cylinder.
Checking the indoor unit electrical connections for firm seating
Danger
Contact with live components can lead to seri-
ous injury from electric current.
When working on the indoor unit, isolate the
system from the power supply, e.g. at a sepa-
rate fuse or a main switch. Wait at least 4 min
until the voltage has dropped out. Check that it
is no longer live. Safeguard against reconnec-
tion.
Checking the outdoor unit electrical connections for firm seating
Danger
Contact with live components can lead to seri-
ous injury from electric current. Some compo-
nents on PCBs remain live even after the power
supply has been switched off.
■
When working on the outdoor unit, isolate the
system from the power supply, e.g. at a sepa-
rate MCB/fuse or a mains isolator. Check the
system is no longer live and safeguard against
reconnection.
■
Prior to working on the appliance, wait at least
4 min until the voltage on the charged capaci-
tors has completely dropped out.
Commissioning, inspection, maintenance
Cleaning the DHW cylinder (cont.)
6222080
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