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Copyright © Greystone Energy Systems Inc. All Rights Reserved

www.greystoneenergy.com

PS-AFSXXX-02

03/20

Greystone Energy Systems, Inc.

150 English Drive, Moncton,

New Brunswick, Canada E1E 4G7

Ph: +1 (506) 853-3057 Fax: +1 (506) 853-6014

North America: 1-800-561-5611

E-mail: mail@greystoneenergy.com

DIFFERENTIAL PRESSURE SWITCH

AFS SERIES

Manual

Reset

Control

or Alarm

PRODUCT DESCRIPTION

The plated housing contains a diaphragm, a

calibration spring and a snap-acting SPDT switch.

The sample connections located on each side of the

diaphragm accept 6.35mm (0.25”) OD tubing via

the integral compression ferrule and nut or barbed

fitting.

An enclosure cover guards against accidental

contact with the live switch terminal screws and the

set point adjusting screw. The enclosure cover will

accept a 12.7mm (0.5”) conduit connection.

Optional pressure ranges and manual resets

available.

ALARM OR CONTROL

To prove excessive airflow or pressure

To prove insufficient airflow or pressure

To prove insufficient airflow or pressure (AFS-460).

SAMPLE MEDIA

Air

MOUNTING POSITION

Diaphragm in any vertical plane

SET POINT RANGE

AFS-222: 0.05 ± 0.02”W.C. to 12.0”W.C.

AFS-262: 0.05 ± 0.02”W.C. to 2.0”W.C.

AFS-460: 0.40 ± 0.06”W.C. to 12.0”W.C.

FIELD ADJUSTABLE OPERATE RANGE AFS-222: 0.07”W.C. to 12.0”W.C.

AFS-262: 0.07”W.C. to 2.0”W.C.

AFS-460: 0.46”W.C. to 12.0”W.C.

FIELD ADJUSTABLE RELEASE RANGE AFS-222: 0.04”W.C. to 11.2”W.C.

AFS-262: 0.04”W.C. to 1.9”W.C.

SWITCH DIFFERENTIAL

AFS-222: Progressive, increasing from approx. 0.02 ± 0.01”W.C. at minimum

set point, to approx. 0.8”W.C. at maximum set point

AFS-262: Progressive, increasing from approx. 0.02 ± 0.01”W.C. at minimum

set point, to approx. 0.1”W.C. at maximum set point

AFS-460: Progressive, increasing from approx. 0.06 ± 0.01”W.C. at

minimum set point, to approx. 0.8”W.C. at maximum set point

MAXIMUM PRESSURE

0.03 BAR (0.5 PSI)

OPERATING TEMP RANGE

-40 to 82°C (-40 to 180°F)

LIFE

AFS-222/262: 100,000 cycles at 0.5 PSI max pressure each cycle and at max

electrical load

AFS-460: 6000 cycles at 0.5 PSI max pressure each cycles and at max electrical

load

ELECTRICAL RATING

300 va pilot duty at 115 - 277 Vac, 10 amp, non-inductive, 277 Vac, 60Hz

CONTACT ARRANGEMENT

AFS-222/262: SPDT

AFS-460: SPDT-NC

ELECTRICAL CONNECTIONS

Screw top terminals with cup washers

CONDUIT CONNECTIONS

0.875” opening accepts ½” conduit

SAMPLE LINE CONNECTIONS

Ferrule and nut compression type connectors that accept 6.35mm (0.25”) OD

rigid tubing

-112: 1/4” OD barbed connector

RESET

AFS-222/262: Automatic

AFS-460: Manual

APPROVALS

AFS-222/262: UL, FM, CSA

AFS-460: UL, CSA, CE

SPECIFICATIONS

PRODUCT

AFS-

Adjustable Differential Pressure Switch

RANGE

222-316

222-112-316

262-316

262-112-316

460

460-112

0.05 ± 0.02”W.C. to 12.0”W.C. with Ferrule and nut compression connections

0.05 ± 0.02”W.C. to 12.0”W.C. with 1/4” OD barbed connections

0.05 ± 0.02”W.C. to 2.0”W.C. with Ferrule and nut compression connections

0.05 ± 0.02”W.C. to 2.0”W.C. with 1/4” OD barbed connections

0.40 ± 0.06”W.C. to 12.0”W.C. with Ferrule and nut compression connections

0.40 ± 0.06”W.C. to 12.0”W.C. with 1/4” OD barbed connections

ORDERING

AFS-

PART NUMBER

NOTE: Greystone Energy Systems, Inc. reserves the right to make design modifications without prior notice.

83mm (3.25”)

93mm (3.875”)

71mm

2.813”

156mm

6.125”

49mm

1.938”

5mm (0.188”)

2 REQ’D

ø

41mm

1.625”

83mm (3.25”)

11mm (0.438”)

20mm (0.781”)

HIGH

PRESS

INLET

LOW

PRESS

INLET

18mm (0.71”)

35mm

1.375”

1/4” OD Barbed Connector

suitable for flexible tubing

-112 Option