Connection On Heating Side; Heat Source Connection - Dimplex SI 35TUR Instructions D'installation Et D'utilisation

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7.2 Connection on 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
liquefier may cause the heat pump to completely break down.
ATTENTION!
The maximum test pressure in the heating circuit and the
brine circuit is 6.0 bar). This value must not be exceeded.
Once the heat pump has been connected to the heating sys-
tem, it must be filled, purged and pressure-tested.
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
Total heat out- Alkaline earths in
put 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.
ATTENTION!
With fully demineralised water, it is important to ensure that
the minimum 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.
It is advisable to mount a dirt trap on the heating water return
side of the mounted hydraulic 4-way reversing valve.
EN-6
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
452237.66.54 · FD 9912
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. The heating circuit should be operated with a suitable
frost protection 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 making the
connection:
Connect the brine pipe to the heat source flow and return of the
heat pump.
The hydraulic integration diagram must be adhered to.
ATTENTION!
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.
ATTENTION!
It is recommended that the brine circuit side be equipped with
the flow rate switch available as an option.
The brine 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 approx. -14 °C.
Only monoethylene glycol or propylene glycol-based antifreeze
may be used.
The heat source system must be de-aerated and checked for
1
leaks.
ATTENTION!
The brine solution must contain at least a 25 % concentration
of a monoethylene glycol or propylene glycol-based frost
protection, which must be mixed before filling.
NOTE
A suitable de-aerator (micro bubble air separator) must be
installed in the heat source circuit by the customer.
SI 35TUR
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