High Pressure Cutout Switch; Low Pressure Cutout Switch; Table 21 High Pressure Cutout Switch Setting; Table 22 Low Pressure Cutout Switch Setting - Data Aire DAPA-2.5 Installation, Operation & Maintenance Manual

The refrigerant circuit has an adjustable Thermal Expansion Valve (TXV). The TXV is factory adjusted
to their normal rating. Any field adjustment should be to "fine tune" a system that has stabilized and
already has acceptable operating parameters. Adjusting a TXV to produce large swings in superheat
is not recommended.
Proper TXV operation can be determined by measuring superheat. The correct superheat setting is
between 8 to 15°F (4.4 to 5.6°C). If too little refrigerant is being fed to the evaporator, the superheat
will be high; if too much refrigerant is being supplied, the superheat will be low.
To adjust the superheat setting:
1. Remove the adjustment cap from the valve.
2. Turn the adjusting stem counterclockwise to lower the superheat.
3. Turn the adjusting stem clockwise to increase the superheat.

High Pressure Cutout Switch

Each refrigerant circuit is protected by a high-pressure cutout switch (non-adjustable) with manual reset
button. The switch is typically located in the evaporator near the compressor. The high-pressure switch
rating is:

Low Pressure Cutout Switch

Each refrigerant circuit has a low-pressure cutout switch (non-adjustable) 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:
NOTICE: Make no more than one turn of the stem at a time. As long as thirty
minutes (30) may be required for the system to re-stabilize.

Table 21 High Pressure Cutout Switch Setting

Action
Cut-out (Open)
Cut-in (Close)

Table 22 Low Pressure Cutout Switch Setting

Action
Cut-out (Open)
Cut-in (Close)
R 410 R 407C
575 PSI 450 PSI
Manual Reset Manual Reset
R 410 R 407C
50 PSI 30 PSI
90 PSI 50 PSI
60