Pneumatech AD Series, Owner'S Manual

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8
7. The Expansion valve is factory set for the correct
superheat of 8 to 10°F (-13 to -12°C) and should not
be re-adjusted. If any malfunction is noticed on the
expansion valve, contact the factory or your
Pneumatech distributor.
8. Allow 10 to 15 minutes of cool down time before
adding the compressed air load.
9. Keeping the dryer outlet isolation valve closed,
pressurize the dryer to the line pressure. See
Figure 1.
10. Check for any leaks in the system.
11. Slowly open the dryer outlet isolation valve to
pressurize the downstream system.
OPERATING RANGE AND
CONTROL SETTINGS
R-134a
Refrigerant Suction Pressure:
25 to 33 PSIG - Blue color range
Refrigerant Discharge Pressure:
75 to 170 PSIG Air-cooled units
115 to 135 PSIG Water-cooled units
Refrigerant Low Pressure Switch:
Cut Out 20 PSIG
Cut In 40 PSIG
Refrigerant High Pressure Switch:
250 PSIG Air-cooled units
225 PSIG Water-cooler units
Fan Control:
Cut Out 110 PSIG
Cut In 150 PSIG
R-404a
Refrigerant Suction Pressure:
69 to 76 PSIG - Orange color range
Refrigerant Discharge Pressure:
235 to 272 PSIG
Refrigerant Low Pressure Switch:
Cut Out 58 PSIG
Cut In Manual reset
Refrigerant High Pressure Switch:
425 PSIG Air-cooled units
385 PSIG Water-cooled units
Fan Control #1:
Cut Out 215 PSIG
Cut In 280 PSIG
Fan Control #2:
Cut Out 225 PSIG
Cut In 295 PSIG
Consult factory for pressure switch settings on dryers
equipped with optional Low Ambient Headmaster
control.