Dimplex LA 1728 Instructions D'installation Et D'utilisation page 22

English
CAUTION!
Installation in a hollow or in an inner courtyard is not
permitted because cooled air collects at ground level and is
drawn in again by the heat pump during extended periods of
operation.
5.2 Condensate pipe
Condensate that forms during operation must be drained off
frost free. To ensure proper drainage, the heat pump must be
mounted horizontally. The condensate pipe must have a mini-
mum diameter of 50 mm and must be fed into a sewer in such
a way that it is safe from frost. Do not discharge the condensate
directly into clearing tanks or cess pits. The aggressive vapours
and a condensate pipe laid in an area which is not frost-free can
destroy the evaporator.
CAUTION!
The frost line can vary according to the climatic region. The
regulations of the countries in question must be observed.
6 Assembly
6.1 General
The following connections need to be established on the heat
pump:
Heating system flows and returns

Condensate drain

Communication line

Control voltage line

Supply voltage line

EN-6
6.2 Connection on the heating side
The heating system connections on the heat pump are to be
made inside the device. Refer to the device information for the
connection sizes. The connection hoses are routed out of the
device in a downwards direction. A spanner must be used to
firmly grip the transitions when connecting the heat pump.
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
liquefier may cause the heat pump to completely break down.
For systems in which the heating water flow can be turned off
using radiator and/or thermostat valves, an overflow valve must
be installed by the customer in a heating bypass upstream from
the heating pump. This ensures a minimum heating water flow
rate through the heat pump and helps to avoid faults.
Once the heat pump has been connected to the heating sys-
tem, it must be filled, purged and pressure-tested. The installed
dirt trap must be checked for soiling at regular intervals (approx.
every 6 months) and cleaned if necessary.
The following points must be observed when filling the system:
 Untreated filling water and make-up water must be of
drinking water quality
(colourless, clear, free of sediments)
Filling water and make-up water must be pre-filtered (max.

pore size 5 µm).
Scale formation in domestic hot water heating systems cannot
be avoided, but in systems with flow temperatures below 60 °C,
the problem can be disregarded. With high-temperature heat
pumps and in particular with bivalent systems in the higher per-
formance range (heat pump + boiler combination), flow tem-
peratures of 60 °C and more can be achieved. The following
standard values should therefore be adhered to with regard to
the filling and make-up water according to VDI 2035, sheet 1:
The total hardness values can be found in the table.
Total heat
output in kW
< 50
50 - 200
200 - 600
> 600
1. This value lies outside the permissible value for heat exchangers in heat
pumps.
Fig. 6.1:Guideline values for filling and make-up water in accordance with
VDI 2035
For systems with an above-average specific system volume of
50 l/kW, VDI 2035 recommends using fully demineralized
water and a pH stabiliser to minimize the risk of corrosion in the
heat pump and the heating system.
CAUTION!
With fully demineralized water, it is important to ensure that
the minimum permissible pH value of 7.5 (minimum
permissible value for copper) is complied with. Failure to
comply with this value can result in the heat pump being
destroyed.
452166.66.44a · FD 0207
Specific system volume
Total alkaline earths
(VDI 2035) in l/kW
in mol/m³ and/or
< 20
mmol/l
Total hardness in °dH
2,0 16,8
2,0  11,2
1,5 8,4
1
< 0,02
< 0,11
www.glendimplex.de
LA 1728
20 < 50 50
11,2
8,4
1
< 0,11
1
< 0,11