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Draining the water heater (if docked)
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 repla-
cing or the cooling module requires servicing, drain the
heating medium side as follows:
1.
Close the shut-off valve for the heating medium side
(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. Do this by slightly slackening off the
connection at the shut-off valve (QM32) that joins
the heat pump to the cooling module.
When the heating medium side is drained, the required
service can be performed and/or replacement of any
components carried out.
Draining the heating medium system in the heat
pump
If the heat pump 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. Do this by slightly slackening off the
connection at the shut-off valve that joins the climate
system and the heat pump at the connection (XL2).
When the heating medium side is empty the requisite
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. This is done by unscrewing the bleed
screw on the highest radiator in the house.
When the climate system is empty the requisite service
can be carried out.
Emptying the brine system
In order to service the brine system it may be easier to
drain the system first. This can be done in different ways
depending on what needs doing:
Draining the brine system in the cooling module
If, for example, the brine pump requires replacing or the
cooling module requires servicing, drain the brine system
by:
1.
Close the shut-off valves to brine system (QM33) and
(QM34).
2.
Connect a hose to the drain valve (QM2), place the
other opening of the hose in a container and open
the valve. A small amount of brine will flow into the
container.
3.
Air must get into the system for the remaining brine
to run out. Do this by slightly slackening off the
connection at the shut-off valve (QM33) that joins
the heat pump with the cooling module.
NIBE™ F1145Chapter 9 | Service64
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