McQuay MDS030A, Руководство по обслуживанию

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44 Service Manual SM-MDS_(ii)

Connection Param 1 : Not applicable (for future provision).

Connection Param 2 : Refers to compensation for long piping application. Default setting is 10 (Setting range
from 10 to 50). It is used to increase capacity of outdoor during low load condition (only a few indoors are
turned ON). For example, when it is set to 15, indoor capacity will be multiply by 1.5 times. When the piping is
long, the outdoor will increase the output capacity to match the losses along the piping to ensure the indoor
received the sufficient capacity.

Connection Param 3 : Compensation for heating cycle. Default value is 37ºC. If indoor coil middle
temperature is too low, outdoor will increase capacity to achieve the set value.
Beside the Modify Outdoor Unit Parameter , there is another button called Special Order . Once the button is
selected, a new window will prompt.

Manual defrost special operation control order : Only applicable for heatpump model and can be activated
during heating cycle. Once the button is selected, the outdoor will automatically go into defrost cycle. The
duration for the defrost cycle will be 10 minutes.

Open valve control order when testing : Useful during commissioning. Once this button is selected, all EXV
will fully open (480 steps). This function is only valid for MDS-B series ((5)MDS 80-500 B/BR). To resume
normal operation, just press on the reset button located on the MDS-M PCB.
Location of Reset button for MDS-M PCB
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