Installation; General; Connection On The Heating Side - Dimplex SI 90TU Installation And Operating Instruction

SI 90TU
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

CAUTION!
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 sys-
tem, it must be filled, de-aerated and pressure-tested.
CAUTION!
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
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.
www.glendimplex.de
Filling and supplementary water as well as heating water, depending on
heat output
Overall heat output in kW
specific water content
heat generator > 0.3 k per kW
specific water content
heat generator > 0.3 k per kW
(e.g. circulating water heaters)
and systems with electric heat-
ing elements
> 50 kW to 200 kW
> 200 kW to 600 kW
Heating water, depending on heating output
Operating mode
Containing salt
Materials in the system
Without aluminium alloys
With aluminium alloys
1. For the purpose of calculating the specific system volume, the smallest indi-
vidual heat output is to be used for systems with several heat generators.
2. In systems with several heat generators with different specific water con-
tents, the smallest specific water content is decisive.
3. For systems with aluminium alloys, full softening is recommended.
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.
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.
The frost protection function of the heat pump manager is ac-
tive whenever the heat pump manager and the heat circulating
pumps are ready for operation. The system must be drained if
the heat pump is taken out of service or in the event of a power
failure. If heat pump systems are implemented in buildings
where a power failure cannot be detected (holiday homes etc.),
the heating circuit should be operated with suitable frost pro-
tection.
452237.66.57b · FD 0209
Total alkaline earths in mol/m³
(Total hardness in dGH)
Specific system volume in l/kW
 20
50
none
2
50
2
 3.0 (16.8)
2.0 (11.2)
1.5 (8.4
> 600 kW < 0.05 (0.3)
Electrical conductivity in µS/cm
3
Low-salt
clear, free from sedimentary substances
English
1
Heat output
20 to 50 50
3.0 (16.8)
1.5 (8.4)
< 0.05 (0.3)
1.0 (5.6)
< 0.05 (0.3)
> 10 to  100
> 100 to  1500
Appearance
pH value
8.2 to 10.0
8.2 to 9.0
EN-5