Product Overview

Cleveland Controls
DIVISION OF UNICONTROL INC.
1111 Brookpark Rd
Cleveland OH 44109
Tel: [phone]
Fax: [phone]
Email:[e-mail]
Web page: http://www.clevelandcontrols.com
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Bulletin AFS460DSS.03
Cleveland Controls
Division of UniControl Inc.
APPLICATION
The Model AFS-460–DSS is a general
purpose airflow proving switch designed
for 120 VAC HVAC and Energy Manage-
ment applications where dual manual re-
set switches with SPST contacts are
needed. It may be used to sense posi-
tive, negative, or differential air pressure.
GENERAL DESCRIPTION &
OPERATION
The plated housing contains a diaphragm,
a calibration spring, and 2 snap-acting
switches with a single manual reset but-
ton.
The sample connections located on each
side of the diaphragm accept .25" (6.35
mm) OD tubing via the integral compres-
sion ferrule and nut.
An enclosure cover guards against acci-
dental contact with the live switch termi-
nal screws and the set point adjusting
screw. The enclosure cover accepts two
0.5" (12.7 mm) conduit connections. The
manual reset button is located on the top
surface of the enclosure cover.
MOUNTING (SEE FIGURE 1)
Select a mounting location which is free
from vibration. The AFS-460–DSS must
be mounted with the diaphragm in any
vertical plane in order to obtain the low-
est specified operating set point. Avoid
(Figure 1)
mounting with the sample line connec-
tions in the "up" position. Surface mount
via the two 3/16" (4.75 mm) diameter
holes in the integral mounting bracket.
The mounting holes are 3-7/8" (98.4 mm)
apart.
AIR SAMPLING
CONNECTION
(SEE FIGURE 2)
The AFS-460–DSS is designed to accept
firm-wall sample lines of ¼" (6.35 mm) OD
tubing by means of ferrule and nut com-
pression connections. An optional ¼"
(6.35 mm) adapter, suitable for slip-on
flexible tubing is available. For sample
lines of up to 10 feet (3.05 metres), ¼"
(6.35 mm) OD tubing is acceptable. For
lines up to 20 feet (6.1 metres), use ¼"
(6.35 mm) ID tubing. For lines up to 60
feet (18.3 metres), use ½" (12.7 mm) ID
tubing. Locate the sampling probe a mini-
mum of 1.5 duct diameters downstream
from the air source. Install the sampling
probe as close to the center of the air-
stream as possible. Refer to Figure 2 to
identify the high pressure inlet (H), and
the low pressure inlet (L). Select one of
the five application options listed below,
and connect the sample lines as recom-
mended.POSITIVE PRESSURE ONLY:
Connect the sample line to inlet H; inlet L
remains open to the atmosphere.
NEGATIVE PRESSURE ONLY: Connect
the sample line to inlet L; inlet H remains
open to the atmosphere.
TWO NEGATIVE SAMPLES: Connect
the higher negative sample to inlet L. Con-
nect the lower negative sample to inlet
H.
TWO POSITIVE SAMPLES: Connect the
higher positive sample to inlet H. Connect
the lower positive sample to inlet L.
ONE POSITIVE AND ONE NEGATIVE
SAMPLE: Connect the positive sample
to inlet H. Connect the negative sample
to inlet L.
Model
AFS-460-DSS
ADJUSTABLE SET POINT AIR PRESSURE SENSING SWITCH WITH DUAL MANUAL RESET