CTC Union EcoPart XL 424, Руководство по установке и обслуживанию

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20 CTC EcoPart XL
General
Air pockets
To avoid air pockets, make sure that the collector hoses constantly rise
towards the heat pump. If this cannot be done, it must be possible to bleed
the system at the high points. The filling pump usually manages smaller local
height discrepancies.
Checking brine difference
When the heat pump is running, regularly check that the temperature
difference between the incoming and outgoing brine temperature is not too
high. If the difference is quite high, one of the reasons for this may be air in
the system or a blocked filter. If this is the case, the heat pump triggers the
alarm for this.
The factory setting for the alarm is 7 °C, but 9 °C is permitted for the first
72 hours that the compressor is in operation, as microbubbles in the system
can reduce brine flow.
Brine pump, standard
The brine pump has three speeds. A different speed can be set depending
on the length of the brine hose being used. With ground source heat, for
example, the hose is longer than for geothermal (bedrock) heat, which can
therefore mean a greater need for a higher speed. The speed of the brine
pump is set so that the difference in temperature between brine in and brine
out is approx.: 3 °C.
Brine pump – low energy pump (LEP)
The brine pump can be set to two different control settings: pressure-
regulated speed or constant speed. Since the brine system has a fixed
pressure drop, constant speed must be set. See the diagram showing
setting of the brine pump. The pump setting is affected by the pressure
drop in the circuit. For this reason, the setting should be reviewed at each
installation. In general, constant operating pressure (option 2) must be
selected. Try different settings to find one that is suitable.
To attain good system performance, the pump must be adjusted. Try to
achieve a temperature difference of approx. 2–4 K.
Set the red button to setup option 2. Adjust so that the correct temperature
difference is obtained.