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SI 26TU - SI 35TU
6 Installation
6.1 General Information
The brine-to-water heat pump must be installed in a frost-free,
dry room on an even, smooth and horizontal surface. The entire
base of the frame should lie directly on the floor to ensure an ad-
equate soundproof seal. If this is not the case, additional sound
insulation measures may be necessary.
The heat pump must be installed so that maintenance work can
be carried out without hindrance. This can be ensured by main-
taining a clearance of approx. 1 m in front of the heat pump.
Neither frost nor temperatures higher than 35? must occur in the
installation location at any time of the year.
6.2 Acoustic Emissions
The heat pump operates silently due to efficient sound insulation.
Internal insulation measures should be carried out to prevent vi-
brations from being transmitted to the foundation or to the heat-
ing system.
7 Installation
7.1 General
The following connections need to be established on the heat
pump. The hydraulic integration diagram must be adhered to:
Flow and return of the brine (heat source system)
Flow and return of the heating system
Temperature sensor
Voltage supply
7.2 Connection on the heating side
ATTENTION!
Flush the heating system prior to 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
liquifier could cause the heat pump to completely break down.
Once the heat pump has been connected to the heating system,
it must be filled, de-aerated and pressure-tested.
ATTENTION!
The maximum test pressure in the heating circuit and the brine circuit is
6.0 bar.
This value must not be exceeded.
The following points must be observed when filling the system:
Untreated filling water and make-up water must be of drink-
ing 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 performance
range (heat pump + boiler combination), flow temperatures 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 hard-
ness 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.
ATTENTION!
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.
P
P
P
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.
Summary of Contents for SI 26TU
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