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5 - HYDRAULIC CONNECTION
5.7 - Heat source connection
Sizing and routing the source system is the system installer's
responsibility and must be carried out in compliance with CARRIER
guidelines.
The system installer must size and install all components required
for the hydraulic circuit (e.g. safety valve, diaphragm expansion
vessel, air vent valve, etc.).
WARNING! The upper pressure limit and maximum
temperatures of the heat pump evaporator specified in the
machine data (see appendix) must not be exceeded at any
time. This applies regardless of whether or not the heat pump
is running and whether the heat transfer medium in the
evaporator is flowing or at rest.
To ensure this, install pressure relief devices in the pipework and
service/check them regularly. Ensure that there are no shut-off
valves in the pipework between the heat pump connection and
the next pressure relief devices. The blow-off flow rate of the
pressure relief device should be 10% higher than the mass flow
required for the system to avoid damaging the system in the event
of a crack in the plate heat exchanger.
As standard, the heat exchanger connections are G2" thread
connections.
Ensure that these connections are not reversed. The positions of
these connections (inlets and outlets) can be found in Figure 4.
The connections must be tension-free and be made with anti-
vibration fittings.
When installing pipework, take care to avoid transmission of
structure-borne sound.
5.7.1 - Heat transfer medium water
Ensure that only clear water with no turbidity is used. Provide a
washable large area filter with a gauge of 500 microns. For
increased operational reliability, we recommend the use of a
centrifugal filter.
Before installing a system, carry out a water analysis
to determine the properties of the water.
■ The water for analysis should be sampled just before the end
of continuous pumping operation and analysed immediately,
otherwise false water readings may be used for the analysis.
We recommend testing the water quality annually.
■ The flow velocity in the pipework should not exceed 1,0 m/s.
■ For reliable, energy saving operation, observe a temperature
differential of 4 K between the evaporator inlet and outlet.
■ The minimum limits of use for the heat source temperature are
+8°C and +42°C.
CARRIER does not accept liability for the correctness of submitted
analyses or changes in water quality.
12
5.7.2 - Water quality
Corrosive and coking substances can cause rust formation and
silting in the evaporator, feed pump and pipework (heat pump
failure). Observe the values of Table 3.
ATTENTION:
A water analysis always only represents a
m o m e n t a r y s n a p s h o t . Va l u e s c a n v a r y
considerably over the course of a year.
An assessment about practical use can only be made based on
submitted measured values!
Table 3: Water quality
Plate heat exchanger
El. conductivity
pH value
Chloride
Sulphate
Carbon dioxide
(free aggressive)
Oxygen
Ammonium
Iron with manganese
Manganese
Sulphide
Chlorine (free)
Caption:
+
Material has generally good resistance
--
We advise against use
0
Rust formation may occur if several factors are rated 0
Please note:
1.) If these limits are not observed, an intermediate circuit
must be provided.
2.) Due to anticipated clogging, we advise against the use of
a water/water heat pump without an intermediate circuit.
Copper
soldered
1.)
[μS/cm]
> 500
< 6
1.)
6 - 8
> 8
< 10
10 - 100
1.)
[mg/l]
100 - 200
> 200
< 50
1.)
[mg/l]
50 – 100
> 100
< 5
1.)
[mg/l]
5 – 20
> 20
< 1
1.)
[mg/l]
1 – 8
> 8
< 2
1.)
[mg/l]
2 – 20
> 20
2.)
[mg/l]
> 0,2
2.)
[mg/l]
> 0,05
1.)
[mg/l]
< 5
1.)
[mg/l]
< 0,5
--
0
+
--
+
+
0
--
+
0
--
+
0
--
+
0
--
+
0
--
-
-
+
+
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