Dimplex LA 22PS, LA 26PS, LA 17PS manual Start-up, Electrical Connection, Preparation, Procedure

6.3

	
	
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6.3Electrical Connection

A standard four-core cable is used for connecting the heat pump to the power supply.

The power supply and the control line are normally installed in the ground (in ductwork with a suitable size and resistance) and routed from the heat pump to the building. This ductwork must extend into the heat pump by approx. 22 mm and be installed with a continuous downward slope in order to comply with Sec- tion 42 of the VDE 0100 regulations. Instead of 90° bends, two 45° bends must be used as pipe bends. The control line and the cable for the power supply are drawn into this ductwork.

The cable (power supply) must be provided by the customer. The conductor cross section is selected in accordance with the power consumption of the heat pump (see Appendix Device Informa- tion) and the applicable VDE (EN) and VNB regulations.

The power supply line on the heat pump must be fed through the provided cable feedthrough into the switch box. The line must be firmly screwed to its feedthrough (vapour sealed pipe union).

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 con- ductors must be installed in the power supply (tripping current in compliance with the Device Information). Ensure that the incom- ing supply has a clockwise rotating field when connecting mul- tiphase devices.

Phase sequence: L1, L2, L3.

ATTENTION!

Ensure that there is a clockwise rotating field: Operating the compressor in the wrong rotational direction could cause damage to the compressor.

The control voltage is supplied via the heat pump controller.

The heat pump controller has a 230 V AC-50 Hz power supply. Connect the controller in compliance with its own operating in- structions (16 A fuse).

The control line (not included in scope of supply) is connected to the heat pump controller using the two rectangular plug connec- tors. Use the plug connector located on the base of the heat pump adjacent to the cable gland in the base plate. More de- tailed information can be found in the operating instructions of the heat pump controller.

For detailed information, see Circuit Diagrams in the Appendix.

7 Start-up

7.1General 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. This may be a condition for extending the guaran- tee (see Warranty Service).

7.2Preparation

The following items need to be checked prior to start-up:

„The heat pump must be fully connected, as described 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 controller must be adapted to the heating system in accordance with the controller’s oper- ating instructions.

„Ensure the condensate outflow functions.

7.3Procedure

The heat pump is started up via the heat pump controller. Adjust- ments should be made in compliance with the instructions.

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 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.

Heat source		Max. temperature spread
temperature		between heating flow and return
From	To	flow
-20 °C	-15 °C	4 K
-14 °C	-10 °C	5 K
-9 °C	-5 °C	6 K
-4 °C	0 °C	7 K
1 °C	5 °C	8 K
6 °C	10 °C	9 K
11 °C	15 °C	10 K
16 °C	20 °C	11 K
21 °C	25 °C	12 K
26 °C	30 °C	13 K
31 °C	35 °C	14 K

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