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6.4
An overflow valve is installed in the device for systems in which
the heating water flow can be shut off via the radiator or thermo-
stat valves. This ensures a minimum heating water flow rate
through the heat pump and helps to avoid faults.
Once the heating system has been installed, it must be filled, de-
aerated and pressure-tested.
The integrated expansion vessel has a volume of 24 litres. This
volume is suitable for buildings with a living space area to be
heated of maximum 200 m².
The volume should be checked by the heating system engineer.
If necessary, an additional expansion vessel must be installed
(according to DIN 4751, Part 1). The tables listed in the manufac-
turers' catalogues simplify dimensioning the system on the basis
of the water content. Allow for a buffer tank volume of 80 litres
when making the calculation.
ATTENTION!
In the case of large-volume heating circuits, an additional expansion
vessel must be used to supplement the installed expansion vessel (24
litres, 1.0 bar admission pressure).
Antifreeze (frost protection)
A method of manual drainage (see illustration) should be pro-
vided for heat pumps which are exposed to frost. The antifreeze
function of the heat pump controller is active whenever the con-
troller and the heat circulating pumps are ready for operation. If
the heat pump is taken out of service or in the event of a power
failure, the system has to be drained. The heating circuit should
be operated with a suitable antifreeze if heat pump systems are
implemented in buildings where a power failure can not be de-
tected (holiday home).
6.4 Electrical Connection
The power supply and control voltage are supplied using the pre-
installed cables (load: three-core, control: three-core).
A disconnecting device with a contact gap of at least 3 mm (e.g.
utility blocking contactor or power contactor) as well as a 1-pole
circuit breaker must be installed in the power supply by the cus-
tomer (tripping current in compliance with the Device Informa-
tion).
The control voltage must be protected by a 10 A fuse. See Ap-
pendix Circuit Diagrams for detailed information.
E-6
7
Start-up
7.1 General Information
To ensure that start-up is performed correctly, it should only be
carried out by an after-sales service technician authorized by the
manufacturer. This will lead, under certain circumstances, to an
extension of the warranty period (cf. Warranty). Start-up should
be carried out in heating operation.
7.2 Preparation
The following items need to be checked prior to start-up:
All of the heat pump connections must be established as de-
scribed in Chapter 6.
All valves that could impair the proper flow of the heating
water in the heating circuit must be open.
The air intake and air outlet paths must not be blocked in any
way.
The ventilator must turn in the direction indicated by the ar-
row.
The heat pump controller must be adapted to the heating
system in accordance with the controller's operating instruc-
tions.
The condensate outflow must not be impaired.
The outflow from the heating water pressure relief valve
must also function correctly.
De-aeration of the heating system:
Ensure that all heating circuits are open and the heat circu-
lating pump is operating (level III).
Apply voltage to the heat pump manager. Select the heat
generator 2 operating mode and de-aerate the system at its
highest point. Top up with water if required (maintain static
minimum pressure).
7.3 Start-Up Procedure
The heat pump is started up via the heat pump controller. Adjust-
ments should be made in compliance with the instructions.
The performance level of the circulating pump must be adapted
to the respective heating system.
The overflow valve must be adjusted to the requirements of the
respective heating system. Incorrect adjustment can lead to
faulty operation and increased energy consumption. We recom-
mend carrying out the following procedure to correctly adjust the
overflow valve:
Close all of the heating circuits that may also be closed during
operation (depending on the type of heat pump usage) so that
the most unfavourable operating state - with respect to the water
flow rate - is achieved.
This normally means the heating circuits of the rooms on the
south and west sides of the building. At least one heating circuit
must remain open (e.g. bathroom).
The overflow valve should be opened far enough to produce the
maximum temperature spread between the heating flow and re-
turn flow listed in the following table for the current heat source
temperature. The temperature spread should be measured as
close as possible to the heat pump. The heating element of mono
energy systems should be disconnected.
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