Commissioning; General Information; Preparation; Special Notes For The Integration Of Heat Pumps In Existing Systems (Renovations) - Dimplex Si 6Tu Montage- Und Gebrauchsanweisungen

SI 6TU - SI 18TU
8

Commissioning

8.1 General Information

To ensure that start-up is performed correctly, it should only be
carried out by an after-sales service technician authorised by
the manufacturer. These measures can also include an addi-
tional warranty under certain conditions (see Warranty).

8.2 Preparation

The following items need to be checked prior to start-up:
The heat pump must be fully connected, as described in

Chapter 7.
The heat source system and the heating circuit must have

been filled and checked.
 The dirt trap must be inserted in the brine inlet of the heat
pump.
 All valves that could impair proper flow in the brine and
heating circuits must be open.
The heat pump manager must be adapted to the heating

system in accordance with the controller's operating in-
structions.
 The hydraulic network must be flushed correctly before in-
stalling the heat pump. This includes the supply line to the
heat pump. Only when flushing is complete can the heat
pump be hydraulically integrated.
The dirt traps present as standard or included for assembly

must be inspected between 4 and 8 weeks after the heat
pump is commissioned or changes made to the heating
system and cleaned if necessary. Further maintenance in-
tervals must be scheduled depending on the level of soil-
ing, which must be defined and carried out by a suitably
qualified person.
Special notes for the integration of heat pumps in
existing systems (renovations):
The existing heat distribution network (pipe materials, connec-
tion types, etc.) and the existing heating systems (e.g. radiators,
underfloor heating, etc.) can impact the quality of the water in
existing systems. Particularly when welded steel pipes or pipes
that are not oxygen diffusion-proof are used, deposits, scaling,
silting or similar may be present that can cause damage in the
heat pump system. This can result in a total failure of the heat
pump The following measures must be observed to avoid this:
Compliance with the water properties and water quality

 Flushing of the hydraulic system
 Maintenance interval of the dirt traps
If silting or ferromagnetic particles are to be expected in the hy-
draulic network, dirt separators or magnetite separators must
be installed on-site before the medium enters the heat pump.
The maintenance intervals must be defined by a suitably quali-
fied person.
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8.3 Start-up Procedure

The heat pump is started up via the heat pump manager.
CAUTION!
The heat pump must be started up in accordance with the
installation and operating instructions of the heat pump
manager.
If an overflow valve is fitted to assure the minimum heating
water flow rate, the valve must be set in accordance with the re-
quirements of the respective heating system. Incorrect adjust-
ment can lead to faulty operation and increased energy con-
sumption. We recommend 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 build-
ing. At least one heating circuit must remain open (e.g. bath-
room).
The overflow valve should be opened far enough to produce
the maximum temperature spread between the heating flow
and return flow listed in the table below for the current heat
source temperature. The temperature spread should be meas-
ured as close as possible to the heat pump. The heating ele-
ment of mono energy systems should be disconnected during
start-up.
Heat source
temperature
From
-5 °C
1 °C
6 °C
10 °C
15 °C
21 °C
452235.66.22b · FD 0507
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
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