Start-Up; General Information; Preparation; Procedure - Dimplex LI 9TU Instructions D'installation Et D'utilisation

LI 9TU - LI 12TU
7.5.3 Connecting an electronically
regulated circulating pump
Electronically regulated circulating pumps have high starting cur-
rents, which may shorten the service life of the heat pump man-
ager. For this reason, a coupling relay is installed or must be in-
stalled between the output of the heat pump manager and the
electronically regulated circulating pump. This is not necessary if
the permissible operating current of 2 A and a maximum starting
current of 12 A are not exceeded in the electronically regulated
circulating pump or if express approval has been issued by the
pump manufacturer.
ATTENTION!
It is not permitted to connect more than one electronically regulated
circulating pump via a relay output.
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 authorised by the
manufacturer. These measures can also include an additional
warranty under certain conditions (see Warranty).

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 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 be clear.
The ventilator must turn in the direction indicated by the ar-

row.
 The settings of the Heat pump manager must be adapted to
the heating system in accordance with the controller's oper-
ating instructions.
 Ensure the condensate outflow functions.
Both the accessories pack in the switch box and that which

is located under the ventilator must be removed.
EN-10

8.3 Procedure

The heat pump is started up via the heat pump manager. Adjust-
ments should be made in compliance with the instructions.
If an overflow valve is fitted to maintain the minimum heat-
ing water flow rate, the valve must be adapted to the require-
ments of the 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 unfavorable 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 during start up.
Heat source
temperature
From
-20 °C
-14 °C
-9 °C
-4 °C
1 °C
6 °C
11 °C
16 °C
21 °C
26 °C
31 °C
At hot water temperatures under 7 °C, start-up is not possible.
The water in the buffer tank must be heated to a minimum
of 18 °C with the second heat generator.
To ensure a problem-free start-up, the following procedure is to
be implemented:
1) Close all consumer circuits.
2) Ensure that the heat pump has the correct water flow.
3) Use the manager to select the automatic operating mode.
4) In the special functions menu, start the "Start-up" program.
5) Wait until a return temperature of at least 25 °C has been
reached.
6) Now slowly reopen the heating circuit valves in succession
so that the heating water flow is constantly raised by slightly
opening the respective heating circuit. The heating water
temperature in the buffer tank must not be allowed to drop
below 20 °C during this process. This ensures that the heat
pump can be defrosted at any time.
7) When all heat circuits are fully open and a return tempera-
ture of at least 18 °C is maintained, the heat pump start-up
is complete.
ATTENTION!
Operating the heat pump at low system temperatures may cause the heat
pump to break down completely.
452160.66.52 · FD 9506
Max. temperature spread
between heating flow and return
flow
To
-15 °C 4 K
-10 °C 5 K
-5 °C 6 K
0 °C 7 K
5 °C 8 K
10 °C 9 K
15 °C 10 K
20 °C 11 K
25 °C 12 K
30 °C 13 K
35 °C 14 K
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