Gast 1534 Series Oilless Vacuum Pumps and Compressors - Manual (Page 9)

The Stearns switch assembly replaces the start relay on motors that require one. Do Not attempt to wire a Stearns
switch as you would a relay as this will damage the switch. Wire switch according to diagram shown.
If motor fails to start or overheats after installation of this switch, disconnect power and review instructions or contact a
Gast Authorized Service Facility.
WIRING INSTRUCTIONS & INFORMATION
< MOTOR WITH INTERNAL CAPACITOR
< MOTOR WITH 3 LEADS & CAPACITOR
< MOTOR WITH 4 LEADS
Start Capacitor
(Wiring ends with
socket terminals
(Wiring ends with
stripped leads)
Jumper wires
(To be supplied
by customer)
Yellow (Common)
Blue
(Run)
Red (Start)
Start Capacitor
Stearns switch
AL338 (115V) & AL339 (230V) STEARNS SWITCH ASSEMBLY