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RTC 6i - www.regulus.eu
Air in system
If there is a bubbling, hissing or even squeaking sound from the piping, circulation pump or near the
outdoor unit, there might be air in the system. Contact the installation company to eliminate these
phenomena. The air in the piping causes a drop in the heating water flow and the system can eva
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luate this as a fault condition.
Insufficient heating water flow
Possible causes are:
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small pipe dimension
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air in pipes
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dirty filter
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closed valve
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impurities deposited in the plate heat exchanger
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other obstacles to water flow
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defective circulation pump
Defrosting
The fan stops during the defrosting cycle, but the compressor is still running. Melted ice flows
into the condensate tray under the heat pump. As soon as defrosting is completed, the fan starts
up again and a cloud of fumes formed by moist air may form for a short time. This is a perfectly
normal phenomenon that disappears after a few seconds. On frosty days, check for ice in unusual
places (heat pump legs, condensate tray, fan, etc.). Possible causes can be: blocked condensate
drain piping (e.g. when condensate freezes inside the piping), defective defrosting control, lack of
refrigerant (leakage), extreme weather conditions.
5.4. Refrigerant circuit diagram
Heating mode
Cooling mode
power supply
four-way valve
heating
water out
heating
water in
compressor
fan
service
valve
plate heat
exchanger
refrigerant
collector
drying
filter
expansion
valve
finned
heat
exchanger
