Dimplex LA 6MR, LA 8MR, LA 12TR, LA 16TR Mounting, Heating-Side Connection, Electrical Connection

MOUNTING

6MOUNTING

6.1 General

The following connections need to be established on the heat pump:

-supply/return lines of the heating system

-condensate drain

-control lead to the remote control

-power supply

6.2 Heating-Side Connection

The connections on the heating side of the heat pump are provided with 1"external thread (flat sealing). When making the connections to the heat pump, use a wrench to counterhold at the transitions.

Before completing the heat pump connections on the heating water side, the heating installation must be flushed in order to remove any impurities that may be present, as well as any residues of sealing material, and the like. Any accumulation of deposits in the condenser may result in a total failure of the heat pump. On systems equipped with heating water flow shut-off devices such as radiator or thermostat valves, an overflow valve, to be provided by the customer, needs to be installed at the outlet of the heat pump in a heating system bypass. This assures a minimum heating water flow through the heat pump and thus prevents any malfunctions from occurring.

Once the installation on the heating side has been completed, the heating system must be filled, de- aerated and pressure-tested..

Heating water minimum flow rate

The heating water minimum flow rate through the heat pump must be assured in all operating states of the heating system. This can be accomplished, for example, by installing a differential pressure-free manifold or an overflow valve. The procedure for setting an overflow valve is described in the Chapter Commissioning.

Frost Protection

On heat pumps installed in a location prone to frost, a manual drain valve (see "Hydraulic Block Diagrams" in the Appendix) should be provided. Properly installed appliances feature an internal frost protection feature. If the heat pump is taken out of service or in the event of a power failure, the system must be drained. In heat pump installations where a power failure cannot be readily detected (e.g. holiday houses), the heating circuit must contain a suitable antifreeze product.

6.3 Electrical Connection

The power connection of the heat pump is effected via a standard 3-core (for 1-phase units) or a 5-core (for 3-phase units) cable.

In the case of the 1-phase units, an additional 3-core cable must be installed for the electric back-up heater.

The cable(s) has (have) to be supplied by the client; the cross-sectional area is to be selected in accordance with the power consumption of the heat pump (see Equipment Data in the appendix) as well as all relevant VDE (EN) and VNB regulations.

The power supply of the heat pump must be equipped with an all-pole disconnecting device with a contact gap of at least 3 mm (e.g. utility company shut-off contactor, power contactor) as well as a 3-pole circuit breaker, with simultaneous tripping of all external conductors (tripping current as stated in the Equip- ment Data).

-optionally, an additional three-core cable is required for the domestic hot water supply.

When connecting multiphase units the clockwise phase sequence of the motor electrical supply must be assured.

Phase sequence: L1, L2, L3.

CAUTION! Clockwise phase sequence (in the case of multiphase units) must be ensured: Operating the compressor in the wrong sense of rotation, may result in damage to the compressor. An incorrect phase sequence causes the fan to operate in the wrong sense of rotation leading to a significant reduction in performance.

The control voltage for the remote control is provided by the power supply of the unit.

The connecting lead (control lead) from the remote control to the heat pump (not included in the scope of delivery) must be suitable for 230 V mains power supply. The lead must have (at least) 6 cores and the cross-section of the single cores must be at least 0.5 mm2.

The power supply of the heat pump must be as specified in the Technical Data of the applicance, i.e. 230 V AC 50 Hz or 3-L/N/PE 400 V.

The connection inside the heat pump is to be effected using the terminal strips in the control box. For detailed information refer to the Wiring Diagrams in the Appendix.

6