QM34
QM32
SF1
QM33
XL1
XL6 XL7
XL4 XL3 XL2
FQ10
QM31
DRAINING THE HOT WATER HEATER
The siphon principle is used to empty the hot water
heater. This can be done either via the drain valve on
the incoming cold water pipe or by inserting a hose into
the cold water connection.
DRAINING THE CLIMATE SYSTEM
In order to carry out service on the climate system, it
may be easier to drain the system first. This can be done
in different ways depending on what needs doing:
NOTE
There may be some hot water when draining
the heating medium side/climate system. There
is a risk of scalding.
Draining the heating medium side in the
cooling module
If, for example, the heating medium pump requires re-
placing or the cooling module requires servicing, drain
the heating medium side as follows:
1.
Close the shut-off valves to heating medium side
(QM31) and (QM32).
2.
Connect a hose to the bleed valve (QM1) and open
the valve. Some liquid will run out.
3.
Air must get into the system for the remaining liquid
to run out. To let in air, slacken off the connection
slightly at the shut-off valve (QM32) that joins the
heat pump with the cooling module.
When the heating medium side is empty, the required
service can be carried out and/or replacement of any
components carried out.
Draining the heating medium system in the
heat pump
If F1245 requires servicing, drain the heating medium
side as follows:
1.
Close the shut-off valves outside the heat pump for
the heating medium side (return and flow line).
2.
Connect a hose to the bleed valve (QM1) and open
the valve. Some liquid will run out.
3.
Air must get into the system for the remaining liquid
to run out. To let in air, slacken off the connection
slightly at the shut-off valve that joins the heat pump
with the cooling module (XL2).
When the heating medium side is empty, the required
service can be carried out.
Draining the entire climate system
If the entire climate system requires draining, do this as
follows:
1.
Connect a hose to the bleed valve (QM1) and open
the valve. Some liquid will run out.
2.
Air must get into the system for the remaining liquid
to run out. To allow air in, unscrew the bleed screw
on the highest radiator in the house.
When the climate system is empty, the required service
can be carried out.
NIBE F1245Chapter 9 | Service60
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