The single circuit, dual stage refrigeration circuit is designed around a high efficiency hermetic scroll compressor. These durable, heavy duty, fully welded compressors have no gaskets or seals, substanially reducing the possibility of refrigerant or oil leaking into the controlled space or environment. Scroll compressors bring a combination of reliability, efficiency, and improved system sound performance to the Modular Data Temp line. 2-stage control is standard. The refrigeration circuit includes built-in compressor overload protection, crankcase heater, filter drier, sight-glass, adjustable expansion valve with external equalizer, low pressure override timer (air cooled units), manual reset high pressure control, compressor short cycle timer, and rotalock service valves.
Water/glycol cooled units include a counterflow coaxial condenser sized to provide the required heat of rejection with minimum water/glycol flow for a low total pressure drop. Head pressure water regulating valves control the condenser water flow to maintain proper head pressure under varying load conditions.
- Air Cooled with Remote Outdoor Condenser: A wide range of outdoor condensers is available. Condensers are manufactured by Data Aire and sized to meet the heat rejection and ambient conditions as required. The industrial duty design includes galvanized corrosion resistant housing, aluminum finned copper tube coils, powder coated fan guards, energy efficient thermally protected direct drive motors, and variable fan speed control on lead fan motor for proper control down to -20° F. Additional fan motors are controlled with ambient thermostats.
- Air Cooled with Indoor Condenser: A wide range of floor mounted indoor condensers with horizontal intake and discharge are available for applications where an outdoor condenser cannot be used. Finished to match the indoor evaporator section, the condenser includes a centrifugal, forward curved, double width, double inlet blower engineered for quiet, reliable operation. The belt driven variable pitch drive provides adjustable air flow. The motor has internal overload protection and is mounted on an adjustable slide base. Indoor condensers are provided with a factory mounted and piped receiver, complete with a head pressure control valve to maintain head pressure under varying ambient conditions down to -30° F.
- Air Cooled with Outdoor Condensing Unit: When compressors are required to be out of the controlled space, Modular Data Temp units are available with a remote outdoor condensing unit. The condensing unit includes a hermetic scroll compressor with built-in overload protection, crankcase heater, filter drier, sight-glass, and condenser coil. The coil is constructed with copper tubes and aluminum fins. The housing is galvanized steel with vertical air discharge. The condenser fan is a variable speed type for head pressure control down to -20° F ambient temperature. Additional fan motors are controlled by ambient fan thermostats.
- Water/Glycol Cooled with Remote Outdoor Fluid Cooler: Remote outdoor fluid coolers are available in a variety of sizes. Each dry cooler includes galvanized corrosion resistant housing, aluminum finned copper tube coil, coated fan guards, surge tank, motor contactor, pump contactor, and energy efficient thermally protected direct drive motors. Multiple fan motors are staged to maintain the desired condenser supply fluid temperature.