Nibe F1255 Installation Manual page 59

2. 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
3.
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 F1255 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.
Air must get into the system for the remaining liquid
3.
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.
NIBE F1255
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).
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 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:
Close the shut-off valve outside the heat pump for
1.
the brine system.
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.
Air must get into the system for the remaining brine
3.
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.
Turn off F1255 by setting the switch (SF1) to " ".
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 F1255 by setting the switch (SF1) to "" and
7.
check that the circulation pump is working.
Chapter 9 | Service 59