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LA 25TU-2 - LA 40TU-2
6.3 Electrical connection
A standard four-core cable is used for connecting the heat
pump to the power supply.
The cable must be provided by the customer. The conductor
cross section is selected in accordance with the power con-
sumption of the heat pump (see appendix Device information)
and the applicable VDE (EN) and VNB regulations.
An all-pole disconnecting device with a contact gap of at least
3 mm (e.g. utility blocking contactor or power contactor) as well
as a 3-pole circuit breaker with common tripping for all external
conductors must be installed in the power supply (tripping cur-
rent in compliance with the device information).
The relevant components in the heat pump contain an internal
overload protection.
When connecting, ensure that the incoming supply has a clock-
wise rotating field.
Phase sequence: L1, L2, L3.
ATTENTION!
Ensure that there is a clockwise rotating field: With incorrect
wiring the starting of the heat pump is prevented. A
corresponding warning is indicated on the display of the heat
pump manager (adjust wiring).
The control voltage is supplied via the heat pump manager.
The heat pump manager has a 230 V AC-50 Hz power supply
and is connected in compliance with its own operating instruc-
tions (16 A fuse).
ATTENTION!
The control line is essential for the operation of air-to-water
heat pumps for outdoor installation. The control cable and
mains cable are to be routed separately. It is not permissible
for the customer to extend the control line.
The control lines (not included in the scope of supply) have rec-
tangular plug connectors on both ends. One end is connected
to the heat pump manager, and the other end is connected to
the switch box in the heat pump. The plug connections to the
heat pump are located on the bottom of the switch box.
Two separate lines are used as control lines. One of the lines is
designed for the 230 V control voltage level, the other for the
signal and/or extra-low voltage level.
More detailed information can be found in the operating in-
structions of the heat pump manager.
For detailed information, see circuit diagrams in the appendix.
7
Start-up
7.1 General
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).
www.gdts.one
7.2 Preparation
The following items need to be checked prior to start-up:
All of the heat pump connections must be installed as de-
scribed in Cap. 6 on page 5.
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 fan must turn in the direction indicated by the arrow.
The settings of the heat pump manager must be adapted
to the heating system in accordance with the manager's
operating instructions.
Ensure the condensate outflow functions properly.
7.3 Procedure
The heat pump is started up via the heat pump manager. Ad-
justments should be made in compliance with the instructions.
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.
8
Cleaning / maintenance
8.1 Maintenance
To protect the paintwork, avoid leaning anything against the
device or putting objects on the device. External heat pump
parts can be wiped with a damp cloth and domestic cleaner.
NOTE
Never use cleaning agents containing sand, soda, acid or
chloride as these can damage the surfaces.
To prevent faults due to sediment in the heat exchanger of the
heat pump, ensure that the heat exchanger in the heating sys-
tem cannot be contaminated. In the event that operating mal-
functions due to contamination still occur, the system should
be cleaned as described below.
452163.66.72 · FD 9912
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