Glen Dimplex LA 60S-TUR, Installation And Operating Instruction, Page: 23 / 56

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LA 60S-TUR English
7.2 Connection on 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. Route the connection hoses out of the device
in a downwards direction. An optional pipe kit is available as an
accessory, which can be used to lead the connections out to
the side.
Use a spanner 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 could cause the heat pump to completely break down.
Once the heat pump has been connected to the heating sys-
tem, it must be filled, de-aerated and pressure-tested.
Consideration must be given to the following when filling the
system:
 Untreated filling water and make-up water must be of
drinking water quality (colourless, clear, free from sedi-
ments)

Filling water and make-up water must be pre-filtered (pore
size max. 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.
Fig. 7.1: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.
Note:
For operation of the heat pump with the four-way reversing
valve, it is essential to set up the hydraulic connections accord-
ing to the instructions included in the scope of supply of the
valve. The instructions give a description of the precise proce-
dure for the correct assembly of hydraulics. Non-observance of
this will lead to restrictions in the operation of the heat pump.
Important:
The notes/settings in the instructions of the heat pump man-
ager must always be observed and carried out accordingly; not
doing so will lead to malfunctions.
Minimum heating water flow
The minimum heating water 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 either a
dual differential pressureless manifold or an overflow valve. The
procedure for setting an overflow valve is described in the
chapter "Start-up". When the minimum heating water flow rate
is undershot, the plate heat exchanger in the refrigeration cir-
cuit can freeze, which can lead to total loss of the heat pump.
The nominal flow rate is specified depending on the max. flow
temperature in the device information and must be taken into
account during planning. With design temperatures below 30 C
in the flow, the design must be based on the max. volume flow
with 5 K spread for A7/W35.
The specified nominal flow rate (See “Device information” on
page 11.) must be guaranteed in every operating status. An in-
stalled flow rate switch is used only for switching off the heat
pump in the event of an unusual and abrupt drop in the heating
water flow rate and not to monitor and safeguard the nominal
flow rate.
Antifreeze
Heat pump systems, which cannot be guaranteed to be frost-
free, should be equipped with a drainage option (see Fig.). The
antifreeze function of the heat pump manager is active when-
ever the heat pump manager and the heat circulating pump are
ready for operation. The system has to be drained if the heat
pump is taken out of service or in the event of a power failure.
The heating circuit should be operated with a suitable anti-
freeze if heat pump systems are implemented in buildings
where a power failure cannot be detected (holiday home).
Total heat
output in kW
Total alkaline earths
in mol/m³ and/or
mmol/l
Specific system volume
(VDI 2035) in l/kW
< 20

20 < 50

50
Total hardness in °dH
< 50

2,0

16,8

11,2
< 0,11
1
50 - 200

2,0

11,2

8,4
200 - 600

1,5

8,4
< 0,11
1
> 600 < 0,02
< 0,11
1
1. This value lies outside the permissible value for heat exchangers in heat
pumps.