Sullair SRL Series - Adjusting the Hot Gas Bypass Valve; Refrigerant

SRL Service Manual
Revision 00
July 2007
Page 58 of 56
12.4 Adjusting the Hot Gas Bypass Valve
The adjustment of the hot gas by-pass valve must be done without air flowing through the dryer. The
pressure should be set between 62.4 and 66.7 psig (
4.3 to 4.6 barg) for all models.
• Mount a precision pressure gauge on the ¼” schrader valve on the refrigerant tube at the outlet of
the evaporator. Make sure to use as short a hose as possible on the gauge to avoid refrigerant
losses which may affect the dryer performance, especially on smaller models.
• Remove the cap on the Hot Gas Bypass Valve.
• To increase the evaporation pressure, turn the regulating screw clockwise (loading the internal
spring)
• To decrease the evaporation pressure, turn the regulating screw anti-clockwise (unloading the
internal spring).
• After adjusting, wait a few minutes to allow the pressures to stabilise. Re-adjust as necessary.