Nibe S1155 Installer Manual page 60

Draining the heating medium system in the
heat pump
If S1155 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).
Connect a hose to the bleed valve (QM1) and open
2.
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.
Air must get into the system for the remaining liquid
2.
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.
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 in order for the remain-
ing brine to run out. To let in air, slacken off the
connection slightly at the shut-off valve (QM33) that
joins the heat pump with the cooling module.
When the brine system is empty, the required service
can be carried out.
Draining the brine system in the heat pump
If the heat pump requires servicing, drain the brine sys-
tem by:
60 Chapter 10 | Service
1. Close the shut-off valve outside the heat pump for
the brine system.
Connect a hose to the drain valve (QM2), place the
2.
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. To let in air, slacken off the connection
slightly at the shut-off valve that joins the brine side
with the heat pump at connection (XL7).
When the brine system is empty, the required service
can be carried out.
HELPING THE CIRCULATION PUMP TO
START
1. Shut off S1155.
2. Remove the front cover
3. Remove the cover for the cooling module.
4. Loosen the venting screw (QM5) with a screwdriver.
Hold a cloth around the screwdriver blade as a small
amount of water may run out.
5. Insert a screwdriver and turn the pump motor
around.
6. Screw in the venting screw (QM5).
Start S1155 and check that the circulation pump is
7.
working.
It is often easier to start the circulation pump with S1155
running. If the circulation pump is helped to start with
S1155 running, be prepared for the screwdriver to jerk
when the pump starts.
GP1
The image shows an example of what a circulation pump can look
like.
QM5
NIBE S1155