CTC Union 588600001, Installation And Maintenance Manual

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20 CTC EcoPart 600M
5.3 Brine pump (G20)
For CTC EcoPart 612M and 616M, a circulation pump is used:
UPMXL - GEO 25-125 180 PWM, 1 x 230 V, 50/60 Hz.
5.1.8 Brine
The brine circulates in a closed system. The fluid consists of water and antifreeze
solution. Sentinel R500 & R500C are recommended for use in the brine circuit.
The glycol is mixed at a concentration of slightly less than 30%, which is
equivalent to fire risk class 2b and a freezing point of around –15°C.
It is a CTC recommendation that around 1 litre of brine/glycol is required per
metre of collector hose, i.e. around 0.3 litres of antifreeze solution will be needed
per metre of hose, for a hose diameter of 40 mm.
5.1.9 Air pockets
To avoid air pockets, make sure that the collector hoses constantly rise towards
the heat pump. If this is not possible, it must be possible to bleed the system
at the high points. The filling pump usually copes with smaller local height
discrepancies.
5.1.10 Checking brine difference
When the heat pump is running, regularly check that the temperature difference
between incoming and outgoing brine temperatures is not too large. If there is a
large difference, one of the causes may be due to air in the system or a blocked
filter. If this is the case, the heat pump triggers the alarm.
The alarm factory setting is 7°C, but 9°C is permitted for the first 72 hours while
the compressor is running, as microbubbles in the system can reduce brine flow.
≤
≤
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 Q [m³/h]
0
2
4
6
8
10
12
[m]
H
0
20
40
60
80
100
120
[kPa]
p
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 Q [l/s]
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 Q [m³/h]
0
40
80
120
160
[W]
P1