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Saturation Index
Filterable materials
Total hardness
Oxygen (O
)
2
-
Nitrite (NO
)
2
2-
Sulphide (S
)
1. If the limit values in the VDI 2035 are more restrictive, these apply accord-
ingly.
2. When using demineralised water, ensure that the minimum permissible pH
value of 8.2 is not undershot. Failure to comply with this value can result in
the heat pump being destroyed.
Fig. 6.2:Limit values for the quality of heating water
Resistance of copper-soldered or welded stainless-steel plate
heat exchangers to the substances present in water:
Notes
"+" = Normally good resistance
"o" = Corrosion problems may arise,particularly if several
factors receive an evaluation of "o"
"-" = Should not be used
NOTE
The water quality should be checked again after 4 to 6 weeks,
as the quality could change during the first few weeks of
operation due to chemical reactions.
NOTE
It is mandatory to use hydraulically closed systems. The use of
open hydraulic systems is not permitted.
NOTE
The notes/settings in the instructions of the heat pump
manager must always be observed and carried out
accordingly; not doing so will lead to malfunctions.
EN-10
< -0.2
o
o
-0.2 - 0.1
+
+
0.1 - 0.2
+
o
> 0.2
o
o
< 30
+
+
> 30
-
-
< 6 °dGH
o/+
o/+
6 - 11 °dGH
+
+
> 11 °dGH
-
-
< 0.02
+
+
< 0.1
+/o
+/o
> 0.1
-
-
< 0.1
+
+
> 0.1
-
-
< 1.0
+
+
> 1.0
-
-
452170.66.02-EN · FD 0305
Minimum heating water flow rate
The minimum heating water flow rate through the heat pump
must be assured in all operating statuses 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 setting an overflow valve is described in the
chapter "Commissioning". When the minimum heating water
flow rate is undershot, the plate heat exchanger in the refriger-
ation circuit can freeze, which can lead to total loss of the heat
pump.
The nominal flow rate is specified depending on the max. flow
temperature in the device information and must be taken into
account during planning. With design temperatures below
30 °C in the flow, the design must be based on max. volume
flow with 5 K spread for A7/W35.
The specified nominal flow rate (see "Device Information" on
page 15.) must be assured in all operating states. A built-in flow
rate sensor is used only for switching off the heat pump in the
event of an unusual and abrupt drop in the heating water flow
rate and not for monitoring and fusing the nominal flow rate.
NOTE
The use of an overflow valve is only recommended for panel
heating and a maximum heating water flow rate of 1.3 m³/h.
System faults may result if this is not observed.
Frost protection
A method of manual drainage (see Fig. 6.3) should be provided
for heat pumps which are exposed to frost. The frost protection
function of the heat pump manager is active whenever the heat
pump manager and the heat circulating pump are ready for op-
eration. In the event of decommissioning or power failure, the
system must be drained and, if necessary, blown out at the
points shown (see Fig. 6.3). The heating circuit should be oper-
ated with a suitable frost protection if heat pump systems are
implemented in buildings where a power failure cannot be de-
tected (holiday home).
1
2
Fig. 6.3:Position of draining device
LA 1422C
3
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