Data Aire GUGU 070 - Electronic Expansion Valve; High Pressure Cutout Switch; Low Pressure Cutout Switch; Liquid Line Solenoid Valve

44 ● gForce Ultra User Manual 10-2014
and operates more quietly by varying speed to match the workload. Tests with VCC
compressors have shown an immediate energy savings and sound level reductions.
5.8.2 Electronic Expansion Valve
The Electronic Expansion Valve (EEV) is standard for this unit. This high efficiency
feature provides an EEV in place of the standard Thermal Expansion Valve (TXV). The
EEV controls superheat through the dap4™ controls by actively measuring suction
pressure via a transducer attached to the suction line and suction temperature via a
thermal transducer strapped to the suction line. The EEV actively adjusts the orifice size
and resulting mass flow of refrigerant to maintain the superheat setpoint. The EEV
maintains more stable system balance and is more energy efficient. With variable
capacity systems, an electronic expansion valve is the solution to handle refrigerant
mass flow variations.
5.8.3 High Pressure Cutout Switch
Each refrigerant circuit is protected by a high pressure cutout switch with manual reset
button. The switch is typically located in the evaporator near the compressor. The
high pressure switch rating is:
R 410R Refrigerant
Setting
Cut-out (Open)
575 PSI
Cut-in (Close)
Manual Reset
5.8.4 Low Pressure Cutout Switch
Each refrigerant circuit has a low pressure cutout switch which features SPST open-low
switch action and automatic reset. The switch is typically located in the evaporator
near the compressor. The low pressure switch rating is:
R 410R Refrigerant
Setting
Cut-out (Open)
50 PSI
Cut-in (Close)
90 PSI
5.8.5 Liquid Line Solenoid Valve
Liquid line solenoid valve(s) (LLVS) are a standard feature on this unit. The LLSV are
direct acting, NC (normally closed; i.e. closed when de-energized) solenoid operated
valve(s). This has the advantage that the valve is closed when the system is not