Mounting; General; Heating-Side Connection; Electrical Connection - Dimplex LA 6 MR Instructions D'installation Et D'utilisation

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
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 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.
Consideration must be given to the following when filling the sys-
tem:
 Untreated filling water and make-up water must be of drink-
ing water quality
(colourless, clear, free from sediments)
 Filling water and make-up water must be pre-filtered (pore
size max. 5µm).
Scale formation in hot water heating systems cannot be com-
pletely avoided, but in systems with flow temperatures below
60°C the problem can be disregarded.
With medium and high-temperature heat pumps, temperatures
above 60°C can be reached.
The following standard values should therefore be adhered to
concerning the filling water and make-up water (according to VDI
2035 Sheet 1):
Total alkaline earths
Total heat
in mol/m³ and/or
output in [kW]
mmol/l

up to 200

200 to 600
> 600 < 0.02
Heating water minimum flow rate
The minimum heating water flow rate through the heat pump
must be assured in all operating states of the heating sys-
tem. This can be accomplished, for example, by installing either
a dual differential pressureless manifold or an overflow valve.
The procedure for adjusting an overflow valve is described in the
Chapter Start-Up. When the minimum flow rate is undershot
drastically, the plate steel exchanger in the refrigerating cycle
can freeze, which can lead to total loss of the heat pump.
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Total
hardness in °dH

2.0 11.2

1.5 8.4
< 0.11
NOTE
The use of an overflow valve is only recommended for panel heating and
a max. heating water flow of 1.3 m³/h. System faults may result if this is
not observed.
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
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.
6.3
EN-5