Ashcroft A Series - N4 Pressure Switch - Manual

Installation and Maintenance Instructions
for Ashcroft A-Series Miniature
Watertight Pressure Switches
INTRODUCTION
The APS and APA pressure switch have NEMA 6, IP 67 Rated
316 stainless steel housing and process connections. The APS
has a factory fixed setpoint which cannot be changed in the field.
The APA is field adjustable and can easily be adjusted by follow-
ing the instructions in the diaphragm above.
ELECTRICAL CONNECTION
The APS and APA switch is available with many various electri-
cal connections. Refer to the figures on other side for wiring color
codes and identification of terminals. Depending on the configu-
ration, the Micro DIN mating connector may or may not be sup-
plied with the switch.
• Only trained and skilled personnel are allowed to attach the
wires to the electrical terminals of the switch.
• Cable couplers, glands and conduit connectors must have the
correct electrical approvals as required by local electrical codes.
• The ground wire/connector is connected to the switch housing.
• Fully insulated mating spade terminals must be used on all
spade terminal connections to prevent a shock hazard and
maintain compliance with approvals.
MICRO SWITCH RATINGS
CODE VAC RATING VDC RATING
H 5A @ 125/250VAC 5A @ 28Vdc resistive
3A @ 28Vdc inductive
P 3A @ 125VAC 2A @ 30Vdc resistive
G 0.1 A @ 125VAC 0.1A @ 30Vdc resistive
L 1A @125VAC 1A @ 28Vdc resistive
L 1A @125VAC 0.5A @ 28Vdcinductive
© 2011 Ashcroft Inc., 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0499, www.ashcroft.com
All sales subject to standard terms and conditions of sale.
I&M009-10045-10/11 (250-2966) Rev. 07/13
FIELD ADJUSTABLE
ADJUSTMENT
COVER
SLIDE COVER DOWN TO ACCESS
SETPOINT ADJUSTMENT SLIDE COVER
UP TO CLOSE AND SEAL ADJUSTMENT
ROTATE LEFT <
TO INCREASE SETPOINT
ROTATE RIGHT >
TO DECREASE SETPOINT
Ø .095 OR SMALLER TOOL
REQUIRED TO ROTATE NUT
FACTORY SET
L O O K F O R T H E S E M A R K S O N O U R P R O D U C T S
S I L 3 C A PA B L E