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 S1156 if there is a risk that the water
in the system has frozen.
NOTE
At the time of commissioning, complete all relevant
sections of the Benchmark Checklist located at
the back of this document.
Completion of the Benchmark Checklist is a condi-
tion of warranty. For full terms and conditions of
warranty, please see our website nibe.co.uk.
Filling and venting
Caution
Insufficient venting can damage internal compon-
ents in S1156.
FILLING THE CLIMATE SYSTEM
1. Open the externally mounted filling valve. Fill the climate
system with water.
2. Open the externally mounted vent valve.
3. When the water that exits the vent valve is not mixed
with air, close the valve. After a while, the pressure
starts to rise.
4. Close the filling valve when the correct pressure is ob-
tained.
VENTING THE CLIMATE SYSTEM
1. Vent the heat pump via an externally mounted vent
valve and the rest of the climate system via the relevant
vent valves.
2. Keep topping up and venting until all air has been re-
moved and the pressure is correct.
FILLING 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 S1156Chapter 6 | Commissioning and adjusting30
Commissioning and adjusting
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