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Design & installation Guide For McQuay MDS Multi System
CHAPTER
2
Unit Control
2.1 Introduction to the Controller
MDS system is controlled by the micro-computer. Several types of controller are available,
including wireless controller, wire controller, wire controller + remote controller and central
controller. One wireless controller can control one unit, one wire controller can control one unit
or up to 48 units, while central controller can control up to 1536 units (32 groups).
2.2 Main Functions
Cooling./heating/auto/air supply/dehumidity mode are available
LCD wired controller and remote control are available, or remote control only
Digital scroll compressor is used for load balancing to reduce the start/stop times of the
constant-capacity compressor.
Electronic expansion valve is used to control the refrigerant flow
One outdoor unit can connect up to 48 indoor units
Internetworking control is available
Both the indoor and outdoor units have three-speed
Timer for ON/OFF
Energy saving can be setting when the unit is running in cooling or heating condition
High/low pressure protection for the compressor
Overload protection for the fan motor in indoor unit and outdoor unit
Anti-icing function for the coil of indoor unit
Function of auto restart after power
Auto defrost and manual defrost can be set
Auto check function for the sensor malfunction
Overheat protection for the coil of indoor unit
Three minutes delayed protection when auto restart after power failure
Malfunction indicating
Temperature unit can be or
o
F.
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