The installer will also charge for any other parts needed for the install such as copper pipe, pipe insulation, connectors, and electrical. They require the use of a licensed refrigeration installer since they are pumped down and charged with refrigerant gas on site. parts such as expansion valve, site glass, dryer, pump down solenoid thermostat, and on freezers a timer and drain heater to install the system. They consist of a condensing unit, evaporator unit and misc. Remote Systems – Remote systems are the least expensive systems to purchase. To be compliant with the law and purchase the best lifetime value always ask for EISA compliant equipment.
Some suppliers may try to sell you non EISA compliant refrigeration systems. These cost a little bit more but save you money in the long run. The new EISA law requires all new walk-ins be equipped with high efficiency motors to be compliant. The gas is then allowed to exit the walk-in through a larger copper pipe to the condensing unit where it is once again compressed and cooled to a liquid state and returned to the evaporator coil inside the walk-in. Since heat always flows toward cold, inside the walk-in air is blown across the evaporation coil to let the coil absorb heat from inside the walk-in. The expansion of the liquid to a gas causes a rapid chilling of the evaporator coil. There, through the expansion valve located in the evaporator coil the liquid is allowed to expand back into a gas. Gas is condensed to a liquid and is then pumped through a small copper pipe into the walk-in to the evaporator coil. The liquid is then pumped through the condensing unit coil while a fan blows outside air through the coil. The compressor compresses gas to a liquid. The condensing unit is located outside the walk-in and the evaporator is located inside the walk-in. Refrigeration systems consist of a condensing unit and an evaporation coil.
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