Nibe S735 - Commissioning and Adjusting; Preparations; Filling and Venting

Preparations
1. Check that the filling valve (QM11) is fully closed.
Caution
Check the miniature circuit-breaker (FC1). It could
have tripped during transport.
NOTE
Do not start S735 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
TIP
Use the enclosed venting hose for easier and more
convenient venting.
FILLING THE HOT WATER HEATER
1. Open a hot water tap in the house.
2. Open the externally mounted filler valve. This valve
should then be fully open during operations.
3. When water comes out of the hot water tap, the hot
water heater is full and the tap can be closed.
FILLING THE CLIMATE SYSTEM
1. Open the vent valves (QM20), (QM22), (QM24) and
(QM26).
2. Check that the enclosed flexible hose is connected
between the filling valves (QM11) and (QM13). Connect
the hose, if this has not been done already.
3. Open the filling valves (QM11), (QM13). The heating unit
and the rest of the climate system fill with water.
4. When the water exiting the vent valves (QM20), (QM22),
(QM24) and (QM26) is no longer mixed with air, close the
valves.
5. After a while, the pressure begins to rise on the pressure
gauge (BP5). When the pressure reaches 2.5 bar (0.25
MPa), the safety valve (FL2) starts to release water.
Close the filling valves (QM11), (QM13).
6. Reduce the pressure in the climate system to the normal
working range (approx. 1 bar) by opening the vent valves
(QM20), (QM22), (QM24) and (QM26) or the safety valve
(FL2).
7. Start the heat pump and allow it to run in both heating
and hot water modes.
VENTING THE CLIMATE SYSTEM
1. Turn off S735 using the on/off button (SF1).
2. Vent the heat pump via the vent valves (QM20), (QM22),
(QM24), (QM26) and the rest of the climate system via
its respective vent valves.
3. Keep topping up and venting until all air has been re-
moved and the pressure is correct.
NOTE
The vent hoses from the container must be drained
of water before air can be released. This means
that the system is not necessarily vented despite
the flow of water when the vent valves (QM20),
(QM22), (QM24), (QM26) are opened.
BP5
SF1
FC1
QM24
QM26 QM20QM13 QM22
FL2QM11
29Chapter 6 | Commissioning and adjustingNIBE S735
Commissioning and adjusting