nilan LMC 223 Installation And User Manual
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Contents
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All rights reserved Page 20 of 33Function DescriptionHeat pump compressorThe system is protected with high and low-pressure switches that can stop the compressor andtrigger an alarm.By heating demand the heat pump compressor starts when the temperature has dropped to set-point minus the neutral zone. When the compressor is operating the central heating temperature israised up to the respective set point before it goes out. The neutral zone helps to avoid frequentstart / stop.Frequency-controlled compressor (variable capacity)The frequency is controlled by a PI regulator. The PI regulator parameters are set in the HEATINGPUMP menu.OTo avoid frequent ON / OFF couplings on the compressor because of the large hysteresis oncentral heating temperature, the compressor starts only when the PI controller's capacity reachesabove 40%. The compressor stops when PI regulator capacity falls to under 10 %.If the compressor continues to start/stop at short intervals, it may be necessary to set a wider neu-tral zone (in the CENTRAL HEAT / NEUTRAL ZONE Menu).Ground pipe and brineThe brine pump always runs with the compressor and starts 1 minute before and runs 1 minutelonger. After a week of inactivity, the pump starts briefly to prevent blockage.The environmental pressure switch triggers an alarm and stops the system if there is a leak in thebrine system.Condenser and heating circulation pumpThe system has a water-cooled condenser with a circulation pump.To prevent excessive condenser pressure in the event of failure of the high pressure switch, hotwater is circulated in the central heating system until the temperature falls below the set maximumvalue for the compressor, before the compressor is started.After a week of inactivity, there is a brief periodic test run.In addition the pump has the following operating modes, which depend on the overriding controlmode:- Winter operation: The pump runs constantly.- Summer operation: The pump is inactive (except for brief periodic test run). |
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