Preparations
1. Check that the externally mounted filling valves are fully
closed.
Caution
Check the miniature circuit-breaker (FC1). It could
have tripped during transport.
NOTE
Do not start S1255 if there is a risk that the water
in the system has frozen.
Filling and venting
Caution
Insufficient venting can damage internal compon-
ents in S1255.
FILLING AND VENTING THE CLIMATE SYSTEM
Filling
1. Open the filling valve (external, not included in the
product). Fill the coil in the hot water heater and the
rest of the climate system with water.
2. Open the vent valve (QM22).
3. When the water that exits the vent valve (QM22) is not
mixed with air, close the valve. After a while, the pres-
sure starts to rise.
4. Close the filling valve when the correct pressure is ob-
tained.
Venting
1. Vent the heat pump via the vent valve (QM22) and the
rest of the climate system via its respective vent valves.
2. Keep topping up and venting until all air has been re-
moved and the pressure is correct.
NOTE
The pipe from the coil in the container must be
drained of water before air can be removed. This
means that the system is not necessarily vented,
despite the flow of water when the vent valve
(QM22) is opened.
FILLING THE HOT WATER HEATER
1. Open a hot water tap in the house.
2. Fill the hot water heater through the cold water connec-
tion (XL3).
3. When the water that comes out of the hot water tap is
no longer mixed with air, the water heater is full and the
tap can be closed.
FILLING AND VENTING THE BRINE SYSTEM
When filling the brine system, mix the water with antifreeze
in an open container. The mixture should be protected
against freezing down to about -15°C. The brine is topped
up by connecting a filling pump.
1. Check the brine system for leakage.
2. Connect the filling pump and return line on the brine
system's filling connection (accessory).
3. If alternative 1 is used (level vessel), close the valve un-
der the level vessel.
4. Close the reversing valve in the filling connection.
5. Open the valves on the filler connector.
6. Start the filling pump.
7. Fill until liquid enters the return pipe.
8. Close the valves on the filler connector.
9. Open the reversing valve in the filling connection.
10. If alternative 1 (level vessel) is used, open the valve un-
der the level vessel (CM2).
NIBE S1255Chapter 6 | Commissioning and adjusting28
Commissioning and adjusting
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