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Master-Bilt Master Controller System
Product Details
View our product brochure (PDF) and training video for details on the Master Contoller Refrigeration Unit.
Master-Bilt developed the optional Master Controller Electronic Controller System and Reverse Cycle Defrost to provide customers with a much more precise and energy efficient refrigeration system for walk-in coolers and freezers.
The Master Controller regulates an electric expansion valve in response to evaporator superheat and return air temperature and its solid state design eliminates the need for many less efficient mechanical parts. Removal of head pressure control valves, for example, saves a substantial amount of electricity because the condensing pressure can float with ambient air temperature resulting in the highest compressor energy efficiency ratio. In addition, the Master Controller's factory pre-set demand defrost eliminates unnecessary defrosts for more energy savings. When combined with Master-Bilt's patented reverse cycle defrost, total energy savings of up to 27% is possible.
Reverse cycle defrost involves a reverse cycle valve which is added to the condensing unit. During defrost, the valve reverses the direction of high temperature refrigerant flow back through the evaporator coil heating it along its entire length and completely eliminating frost buildup. By comparison, only a certain amount of the coil is heated by traditional defrost heaters, leaving ice deposits which weaken evaporator performance. Defrost time is also reduced from 20-30 minutes with conventional electric defrost to 3-5 minutes.
Master-Bilt's reverse cycle option differs from other manufacturers' versions because it's controlled by the electric expansion valve found within the Master Controller system. Other systems rely on mechanical components, such as check valves and extra thermostatic expansion valves to control the reverse cycle valve.
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