Install Instructions

v P
MODEL - SMD
Tubing: Recommended as minimums: 1/4” copper or
aluminum tubing; 1/8” pipe. All tubing and pipe must be
clean and free from oil, dirt, and chips. If piping runs
over five feet long, use larger size tubing or pipe, and
reduce size at switch connection.
Air Connection
Air Connection
Should be connected as shown in drawings.
Air Supply
Pressure Only
Vacuum Only
Vacuum
Connection
Pressure
Connection
High Vacuum or
(Low Pressure)
Differential
Low Vacuum or
(High Pressure)
Switch Differential @ 70º F
Differential Operating Pressure
Range
.015” to .03” W.C. .17” - 1” W.C.
.5” W.C. .17” - 6” W.C.
1.0 W.C. .17” - 12” W.C.
v P
Adjusting screw
Always leave un-used ports open to atmosphere.
Positive Pressure
Negative Pressure
Port Label
(FM Only)
NC
NO
C
SMDI 1010802016 Rev. A 11/07