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7.3 Heat Source Connection
The following procedure must be observed when connecting the
heat source:
Connect the brine pipe to the heat pump flow and return.
ATTENTION!
Insert a dirt trap in the heat source inlet of the heat pump to protect the
evaporator against the ingress of impurities.
In addition, a breather must be installed at the highest point in the
heat source system.
The brine liquid must be produced prior to charging the system.
The liquid must have an antifreeze concentration of at least 25 %
to ensure frost protection down to -14 °C.
Only monoethylene glycol or propylene glycol-based antifreeze
may be used.
The heat source system must be de-aerated and checked for
leaks. The pressure indicator is located on the control panel.
ATTENTION!
The brine solution must contain at least 25 % of an antifreeze agent on a
mono-ethylene glycol or propylene glycol basis and must be mixed prior
to filling.
7.4 Electrical Connection
Connect the mains supply cable to the control panel of the heat
pump via terminal X1.
ATTENTION!
When there is danger of frost, the circulating pump will also start
immediately in standby mode after connecting the power supply.
All electrical components required for the operation of the heat
pump are located on the control panel.
Heat pump - special tariff
Many utility companies offer a special agreement with a lower
electricity tariff when heat pumps are implemented. In return, the
utility company is able to block the heat pump at times of peak
demand.
If this is the case, the customer must provide an all-pole discon-
necting device with a contact gap of at least 3 mm (e.g. utility
blocking contactor or power contactor) as well as a circuit brea-
ker with common tripping for all external conductors. The re-
quired cross-sectional area of the conductor is to be selected ac-
cording to the power consumption of the heat pump, the
technical connection requirements of the relevant utility company
as well as all applicable regulations. Details on the power con-
sumption of the heat pump are listed on both the product infor-
mation sheet and the type plate. The connection terminals are
designed for a max. conductor cross-section of 10mm
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8
Start-up
8.1 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.
8.2 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 7.
The heat source system and the heating circuit must have
been filled and checked.
The dirt trap must have been inserted in the brine inlet of the
heat pump.
All valves that could impair proper flow in the brine and heat-
ing circuits must be open.
8.3 Start-Up Procedure
The heat pump is started up using the switch (1).
If an overflow valve is fitted to maintain the minimum heating
water flow rate, the valve must be adapted to the requirements of
the heating system. Incorrect adjustment can lead to faulty oper-
ation and increased energy consumption. We recommend carry-
ing 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 table below for the current heat source tem-
perature. The temperature spread should be measured as close
as possible to the heat pump. The heating element of mono en-
ergy systems should be disconnected.
Heat source
temperature
From
-5 °C
1° C
6° C
2
.
10° C
15° C
21° C
Max. temperature spread
between heating flow and
return flow
To
0 °C
10 K
5° C
11 K
9° C
12 K
14° C
13 K
20° C
14 K
25° C
15 K
8.3
E-5
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