Dimplex LA 60P-TUR Installation And Operating Instruction page 37

LA 60P-TUR
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
Overall heat Alkaline earths in
output in kW mol/m³ and/or
mmol
2.0
< 50
2.0
50 - 200
200 - 600 1.5
> 600 < 0.02
1. This value lies outside the permissible value for heat exchangers in heat
pumps.
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 the use of fully demineralised
water and a pH stabiliser to minimise the risk of corrosion in the
heat pump and heating system.
CAUTION!
With fully demineralised 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. These instructions describe the procedure for setting up
the correct hydraulics in more detail. 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. The maximum water outlet
temperature must not exceed 64°C and must be secured on
the system side so that, if the temperature is exceeded, all addi-
tional heat sources are switched off safely.
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 system.
This can be accomplished, for example, by installing a dual dif-
ferential pressureless manifold.
www.glendimplex.de
Specific system volume
(VDI 2035) in l/kW
20 < 50 50
< 20
Total hardness in °dH
16.8 11.2
 11.2 8.4
< 0.11
8.4
1
< 0.11
1
< 0.11
452167.66.42 · FD 0008
CAUTION!
When the minimum heating water flow rate is undershot, the
plate heat exchanger in the refrigeration circuit 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 (Cap. 12 on page 19) must be
assured in all operating states. An installed flow rate switch is
used only for switching off the heat pump in the event of an un-
usual and abrupt drop in the heating water flow rate and not to
monitor and safeguard the nominal flow rate.
Frost protection
On heat pump systems where protection from frost cannot be
guaranteed, there must be an option for draining the system
(see figure). The frost protection function of the heat pump
manager is active whenever the heat pump manager and the
heat circulating pump are ready for operation. The system must
1
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 frost protection if heat pump systems are imple-
mented in buildings where a power failure cannot be detected
(holiday home).
English
EN-13