Heating System Connection; Heat Source Connection - Dimplex SI 6TU Instructions D'installation Et D'utilisation

SI 6TU - SI 18TU

7.2 Heating System Connection

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 heating system has been installed, 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 (ü). This value must not be exceeded.
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.
Total alkaline earths
Total heat
in mol/m³ and/or
output in kW
mmol/l
2.0
< 50
2.0
50 - 200
1.5
200 - 600
> 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 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.
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Specific system volume
(VDI 2035) in l/kW
20 < 50 50
< 20
Total hardness in °dH
16.8 11.2
 11.2 8.4
1
< 0.11
8.4
1
< 0.11
1
< 0.11
452235.66.22a · FD 0106
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 either a
dual differential pressureless manifold or an overflow valve. The
procedure for adjusting an overflow valve is described in the
Chapter Start-Up.
NOTE
The use of an overflow valve is only recommended for panel
heating and a max. heating water flow of 1.3 m³/h. System
faults may result if this is not observed.
The antifreeze function of the heat pump manager is active
whenever the heat pump manager and the heat circulating
pumps are ready for operation. If the heat pump is taken out of
service or in the event of a power failure, the system has to be
drained. The heating circuit should be operated with a suitable
antifreeze if heat pump systems are implemented in buildings
where a power failure can not be detected (holiday home).

7.3 Heat Source Connection

The following procedure must be observed when connecting
the heat source:
Connect the brine pipe to the heat pump flow and return. The
hydraulic integration diagram must be adhered to.
CAUTION!
The supplied dirt trap must be inserted in the heat source inlet
of the heat pump to protect the evaporator against the ingress
of impurities.
The brine liquid must be produced prior to charging the system.
The liquid must have an antifreeze concentration of at least
25 % to ensure frost protection down to -14 °C.
Only monoethylene glycol or propylene glycol-based antifreeze
may be used.
The heat source system must be de-aerated and checked for
leaks.
CAUTION!
The brine solution must contain at least a 25 % concentration
of a monoethylene glycol or propylene glycol-based
antifreeze, which must be mixed before filling.
NOTE
If necessary, the operating range can be extended to a brine
inlet temperature of -10 °C. In this case, the minimum brine
concentration must be
temperature -17 °C)
CAUTION!
The maximum test pressure in the heating circuit and the
brine circuit is 6.0 bar (ü). This value must not be exceeded.
NOTE
A suitable de-aerator (micro bubble air separator) must be
installed in the heat source circuit by the customer.
English
adjusted to 30 %. (Freezing
EN-5