Mounting; General; Heating-Side Connection; Frost Protection - Dimplex LA 6MR Installation And Operating Instrictions

6

Mounting

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 pro-
vided with 1" external thread (flat sealing). When making the con-
nections 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 re-
move 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 pro-
vided 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 Commis-
sioning.

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 in-
ternal 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 stand-
ard 3-core (for 1-phase units) or a 5-core (for 3-phase units) ca-
ble.
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 ap-
pendix) as well as all relevant VDE (EN) and VNB regulations.
An all-pole isolating switch with at least 3 mm clearance on each
pole (e.g. utility company shut-off contactor, power contactor) as
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well as a 3-pole circuit breaker (for 3-phase appliances) or a 1-
pole circuit-breaker (for 1-phase appliances) with simultaneous
tripping of all external conductors (tripping current as stated in
the Equipment Data) must be provided in the electrical supply cir-
cuit of the heat pump.
optionally, an additional three-core cable is required for the
domestic hot water supply.
When connecting multiphase units the clockwise phase se-
quence of the motor electrical supply must be assured.
Phase sequence: L1, L2, L3.
ATTENTION!
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 suita-
ble 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.
7

Commissioning

7.1 General
To ensure proper commissioning it should be carried out by an
after-sales service authorized by the manufacturer. This will lead,
under certain circumstances, to an extension of the warranty pe-
riod (cf. Warranty).

7.2 Preparatory Steps

Prior to commissioning, the following items need to be checked:
All connections of the heat pump must have been made as
described in Chapter 6.
In the heating circuit all valves that could impair the proper
heating water flow must be open.
The air intake/discharge path must be unobstructed.
The sense of rotation of the fan must correspond to the di-
rection of the arrow.
An operating mode must have been set on the remote con-
trol.
Proper condensate drainage must be ensured.

7.3 Procedure

The start-up of the heat pump is effected via the remote control.
Where an overflow valve is fitted to assure the minimum heating
water flow rate, the valve must be set in accordance with the spe-
cific requirements of the heating installation. An incorrect setting
7.3
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