Cleveland Controls AFS-460-137 Quick Start Manual

Manual Reset DPDT Air Pressure Sensing Switch for 24 VAC Applications
Application
The Model AFS-460–137 is a general
purpose airflow proving switch designed
for 24 VAC HVAC and Energy Manage-
ment applications where a manual reset
switch with DPDT contacts is desirable.
It may be used to sense positive, nega-
tive, or differential air pressure.
General Description &
Operation
The plated housing contains a dia-
phragm, a calibration spring, a snap-act-
ing switch with manual reset button, and
a dpdt relay.
The sample connections located on each
side of the diaphragm accept .25" OD
tubing via the integral compression fer-
rule and nut.
An enclosure cover guards against ac-
cidental contact with the live switch ter-
minal screws and the set point adjusting
screw. The enclosure cover will accept
a 0.5" conduit connection. The manual
reset button is located on the top sur-
face of the enclosure cover.
(Figure 1)
Distributed by:
Bulletin AFS 460137.03
Mounting (see Figure 1)
Select a mounting location which is free
from vibration. The AFS-460–137 must
be mounted with the diaphragm in any
vertical plane in order to obtain the low-
est specified operating set point. Avoid
mounting with the sample line connec-
tions in the "up" position. Surface mount
via the two / " diameter holes in the
3
16
integral mounting bracket. The mount-
ing holes are 3- / " apart.
7
8
Air Sampling Connection
(see Figure 2)
The AFS-460–137 is designed to accept
firm-wall sample lines of ¼" OD tubing
by means of ferrule and nut compres-
sion connections. An optional ¼"
adapter, suitable for slip-on flexible tub-
ing is available. For sample lines of up
Model
AFS–460–137
to 10 feet, ¼" OD tubing is acceptable.
For lines up to 20 feet, use ¼" ID tub-
ing. For lines up to 60 feet, use ½" ID
tubing. Locate the sampling probe a
minimum of 1.5 duct diameters down-
stream from the air source. Install the
sampling probe as close to the center
of the airstream 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 op-
tions listed below, and connect the
sample lines as recommended.
(Figure 2)
Cleveland Controls
Division of UniControl Inc.
111Brookpark Road • Cleveland OH 44109
TEL: (216) 398-0330 • FAX: (216) 398-8558