Product Overview

Nominal Dimensions in Inches (Millimeters)
ELECTRICAL CONNECTIONS
(SEE FIG. 3)
Before pressure is applied to the dia-
phragm, the snap switch contacts will be
in the normally closed (NC) position as
shown in Fig. 3.
The snap switches have screw top ter-
minals with cup washers. Wire alarm and
control applications as shown in Fig. 4.
FIELD ADJUSTMENT:
LEAD & LAG SNAP SWITCHES
(SEE FIG. 4)
The AFS-460-DSS Manual Reset Air
Switch has a lead snap switch adjust-
ment of 1.25" w.c. to 12.0" w.c. (31.8
mm w.c. to 305 mm w.c.) The set point
adjusting screw is used to adjust the set
point of the lead snap switch (Switch A,
in Fig. 4). The lag snap switch (Switch
B, in Fig. 4) operates after the lead snap
switch at progressively increasing set
point increments as indicated in Table
1, below. Note: if simultaneous opera-
tion of Switch A and Switch B is required,
use Model AFS-460-136 or AFS-460-
137.
To adjust the set point of Switch A:
Turn the adjusting screw counterclock-
wise until motion has stopped. Next, turn
the adjusting screw four complete turns
in a clockwise direction to engage the
spring. From this point, the next ten turns
will be used for the actual calibration.
Each full turn represents approxi-
mately 1.0" w.c. (25.4 mm w.c.). Please
note: To properly calibrate an air switch,
a digital manometer or other measuring
device should be used to confirm the
actual set point.
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(Figure 3)
(Figure 2)
SPECIFICATIONS
MODEL AFS-460-DSS
AIR PRESSURE SENSING SWITCH
WITH MANUAL RESET & DUAL
SPST-NC CONTACT ARRANGEMENT
Mounting Position (in order to meet lowest
operating specifications): Mount with the
diaphragm in any vertical plane.
Set Point Range:
1.25 ± 0.06"w.c. to 12.0"w.c. (31.8mm
±1.52mm w.c. to 305 mm w.c.)
Field Adjustable “Operate Range”:
1.31"w.c. to 12.0" w.c.
Field Adjustable “Release Range”:
1.31"w.c. to 11.2" w.c.
Approximate Switch Differential: Progres-
sive, increasing from approximately 0.06±
0.01"w.c. at minimum set point, to approxi-
mately 0.8"w.c. at maximum set point.
Measured Media: Air, or combustion by-
products that will not degrade silicone.
Maximum Pressure: ½ psi (0.03 bar;
3.45 kPa)
Life: Exceeds UL-recognized mechanical
endurance test of 6,000 cycles minimum at
0.5 psi (0.03 bar, 3.45 kPa) maximum
pressure each cycle and at maximum
electrical load.
Electrical Rating: @ 60 Hz.
15 amp 125, 250, or 277 v AC
¼ hp 125 v AC, ½Hp 250 VAC,
½ amp 125 v DC, ¼ amp 250 v DC.
0.5 VA @ 24 v AC, 50/60 Hz.
Contact Arrangement:
2 SPST–NC (manual reset).
Electrical Connections:
Screw top terminals with cup washers.
Conduit Opening: 7/8" diameter opening
accepts ½" conduit.
Sample Line Connectors: Male, externally
threaded 7/16" 24 UNS 2A thread, complete
with nuts and self-aligning ferrules.
Sample Line Connections: Connectors will
accept ¼" (6.35mm) OD rigid or semi-rigid
tubing.
Approval and Recognition:
UL & CSA approved; CE pending.
Shipping Weight: 1.2 lbs.
(Figure 4)