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SI 85 TUR
7.3 Connection on heating side
ATTENTION!
!!
The heating system must be flushed prior to connecting the
heat pump.
Before completing the heat pump connections on the heating
water side, the heating installation must be flushed in order to
remove any impurities that may be present, as well as residues
of sealing material, and the like. Any accumulation of deposits
in the condenser may result in a total failure of the heat pump.
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 installation on the heating side has been completed,
the heating system must be filled, de-aerated and pressure-
tested.
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 sediments)
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.
Fig. 7.7: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.
Use of the optionally available four-way reversing valve is rec-
ommended. A detailed installation description can be found in
the instructions included with the valve.
Heating water minimum 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.
Provided the heat pump manager and heating circulating
pumps are ready for operation, the frost protection feature of
the heat pump manager is active. If the heat pump is taken out
of service or in the event of a power failure, the system has to be
drained. In heat pump installations where a power failure can-
not be readily detected (holiday house), the heating circuit must
contain a suitable antifreeze product.
7.4 Connection on heat source side
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 strainer must be fitted in the heat source inlet of
the heat pump in order 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 liquid must be produced prior to charging the system.
The brine concentration must be at least 25 %. Freeze protec-
tion down to approx. -14 °C can thus be ensured.
Only antifreeze products on the basis of mono-ethylene glycol
or propylene glycol may be used.
The heat source system must be vented (de-aerated) and
checked for leaks.
ATTENTION!
!!
The brine solution must contain at least 25 % of an antifreeze
agent on a mono-ethylene glycol or propylene glycol basis
and must be mixed prior to filling.
NOTE
º
A suitable de-aerator (micro bubble air separator) must be
installed in the heat source circuit by the customer.
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
50 - 200
2.0
11.2
8.4
200 - 600
1.5
8.4
< 0.11
> 600
< 0.02
< 0.11
1
1. This value lies outside the permissible value for heat exchangers in heat
pumps.
