Heating System Connection - Dimplex LI 15TE Installation And Operating Instructions Manual

When very short air ducts are used on the air outlet, the exterior
side of the wall opening must be fitted with a safety guard or an
air deflector grille suitable for preventing body parts (fingers or
arms, especially those of children) coming into contact with the
ventilator in the heat pump.Care must also be taken to ensure
that suitable vibration isolation and duct insulation are provided.
If flange-mounted air ducts are used, connecting stubs are se-
cured on the air inlet and air outlet sides with 4 M8 hexagon bolts
in the threaded holes provided (the hexagonal long nuts). When
doing this, ensure that both air duct stubs only touch the insula-
tion. There should be no contact with the external sheeting.
On the selected air outlet side (reposition one of the air duct cov-
ers if required) the pre-punched elements (ø 12) remaining in the
pre-cut insulation are to be removed. The hexagonal long nuts (4
in the accessories pack) are to be positioned in the pre-punched
holes and fixed with the screws (M8x16) provided from the inside
of the device.

7.3 Heating System Connection

The heating system connections on the heat pump have a 1¼"
external thread. Use a spanner to firmly grip the transitions when
connecting the heat pump.
This heat pump is also available with an optional second i.e. al-
ternative heating connection on the right side of the device.
These connections (1¼" thread) are closed with flat-sealing blind
caps at the factory. When the alternative connection is chosen,
these blind caps are to be mounted onto the standard connec-
tions.
Before connecting the heating water system to the heat pump,
the heating system must be flushed to remove any impurities,
residue from sealants, etc. Any accumulation of deposits in the
liquifier could cause the heat pump to completely break down.
For systems in which the heating water flow can be shut off via
the radiator or thermostat valves, an overflow valve must be in-
stalled in a heating bypass behind the heat pump by the cus-
tomer. This ensures a minimum heating water flow rate through
the heat pump and helps to avoid faults.
Once the heating system has been installed, it must be filled, de-
aerated and pressure-tested.
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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. 5 µm).
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 heat
output in [kW]
up to 200
200 to 600
> 600
Minimum heating water 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 a dual
differential pressureless manifold. When the minimum flow rate
is undershot, the plate steel exchanger in the refrigerating cycle
can freeze, which can lead to total loss of the heat pump.
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.
Antifreeze
Heat pump systems, which cannot be guaranteed to be frostfree,
should be equipped with a drainage option (see Fig.). The anti-
freeze function of the heat pump manager is active whenever the
heat pump manager and the heat circulating pump are ready for
operation. If the heat pump is taken out of service or in the event
of a power failure, the system has to be drained. The heating cir-
cuit should be operated with a suitable antifreeze if heat pump
systems are implemented in buildings where a power failure can
not be detected (holiday home).
452160.66.49 · FD 9302
Total alkaline earths
Total
in mol/m³ and/or
hardness in °dH
mmol/l
 
2.0 11.2
 
1.5 8.4
< 0.02 < 0.11
LI 15TE
EN-7