Dimplex WI 14TU Instructions D'installation Et D'utilisation page 26

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12) A return sensor is integrated into the heat pump. The return
flow sensor must be installed in the immersion sleeve in the
manifold when a dual differential pressureless manifold is
used. The single-core wires are then connected to termi-
nals X3/GND and X3/ R2.1. Bridge A-R2 (situated between
X3/B2 and X3/1 when delivered) must then be moved to
terminals X3/1 and X3/2.
13) The external sensor (R1) is connected to terminals X3/GND
and X3/R1.
14) The domestic hot water sensor (R3) is included with the
domestic hot water cylinder and is connected to terminals
X3/GND and X3/R3.
7.5.3 Connecting an electronically
regulated circulating pump
Electronically regulated circulating pumps have high starting
currents, which may shorten the service life of the heat pump
manager. For this reason, a coupling relay is installed or must be
installed between the output of the heat pump manager and
the electronically regulated circulating pump. This is not neces-
sary 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 is-
sued by the pump manufacturer.
CAUTION!
It is not permitted to connect more than one electronically
regulated circulating pump via a relay output.
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 6.
 The heat source system and the heating circuit must have
been filled and checked.
All valves that could impair proper flow in the well and heat-

ing circuits must be open.
The heat pump manager must be adapted to the heating

system in accordance with the controller's operating in-
structions.
EN-8
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
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
7 °C
13 °C
19 °C
452235.66.21a · FD 0106
WI 10TU - WI 22TU
Max. temperature spread
between heating flow and return
flow
To
12 °C 10 K
18 °C 11 K
25 °C 12 K
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heat pump