A.J. Antunes & Co SMD 8021202103 User Manual

A. J. ANTUNES & CO. www.ajantunes.com 180 Kehoe Blvd., Carol Stream, Illinois 60188

SMD Installation Information

IMPORTANT

Please read these instructions carefully to assure
correct installation. This equipment must be
installed only by a licensed electrician who is
experienced with combustion safeguard control
systems and understands the functions of inter­locking switches, such as gas pressure switches.
Prior to being put into operation in conjunction
with the combustion safeguard systems, all
switches should be tested for proper range setting
and proper wiring. Check piping connections and
switch house for leaks with a soap bubble test. All
exhaust fans and blowers should be inspected and
checked for proper rotation prior to starting up.

SMD Switches

You are installing one of the finest switches of its type on
the market. You will find this switch has many superior
features that ensure dependable, accurate, long life oper­ation. This switch is highly sensitive and fully approved. It
is UL and CSA listed and has FM approval (optional).

Specifications

Electrical Ratings: 10A @ 125 VAC, 8A @ 250 VAC, 7A

@ 277 VAC, 1/8 HP @125 VAC, 1/4 HP @ 250 VAC
Pilot Duty, 125 VA @ 125/277 VAC

Max. Surge Pressure: 20” W.C.

Max. Ambient Operating Temperature: 170°F (77°C)

Min. Ambient Operating Temperature: -40°F (-40°C)

Shipping Weight: 1 lbs. (.45 kg)

Optional Fittings:

1/4” Barb

1/4” Tube

1/4” Compression

Switch Differential

Switch Differential @ 70º F

Differential

.015” to .03” W.C. .17”–1” W.C.

.5” W.C. .17”–6” W.C.

1.0” W.C. .17”–12” W.C.

Operating Pressure

Range

Dimensions

Mounting holes
for #8 screw

3 19/32”
(91 mm)

4 13/32”

(112 mm)

2 1/4”

(57 mm)

1/2” Conduit

Knockout

3”

(76 mm)

Standpipe with
adjusting screw

NOTE: Dimensions are
for reference only.

Installation

Models may be mounted in the horizontal or vertical posi­tion. All switches are tested at the factory in a vertical
position. Mounting diaphragm in vertical position is the
preferred method.

If mounting in horizontal position, the micro switch must
be on top. When mounted in this position, the minimum
sensitivity may be higher than that specified.

Range Adjustment

All settings are made with the diaphragm in a vertical
position. The switch is shipped with the adjustment at
minimum .17” W. C.

To adjust, turn adjusting screw with screwdriver. To
increase pressure setting, turn adjustment screw in a
clockwise direction. To decrease pressure setting, turn
adjusting screw in a counterclockwise direction.

If adjusting screw is removed, apply a non-hardening
pipe compound to the threads before replacing. Check for
leaks with a soap bubble test using maximum 20” W.C.

1-630-784-1000 Fax: [phone] Page 1 of 4 P/N 1011083 06/10
1-800-253-2991

A. J. ANTUNES & CO. www.ajantunes.com 180 Kehoe Blvd., Carol Stream, Illinois 60188

SMD Installation Information

Standard Inlet Locations (1/8” NPT without
fittings)

Negative

Side inlets.

One side inlet and one machine

thread adapter with nut

(Specify 1-14 UNS).

Specify Other Inlet Locations

(Vacuum)

Inlet

Positive

(Pressure)

Inlet

Negative

(Vacuum)

Inlet

Positive

(Pressure)

Inlet

Air Supply

Should be connected as shown in the drawings below.
Always leave unused ports open to the atmosphere.

DIFFERENTIAL INLET CONNECTION

High Vacuum or
(Low Pressure)

Low Vacuum or
(High Pressure)

PRESSURE ONLY

Air Connections

Tubing recommended as minimums: 1/4” copper or alu­minum tubing, or 1/8” pipe. All tubing and pipe must be
clean and free from oil, dirt, and chips. If piping runs over
five feet long, use a larger size tubing or pipe, and reduce
size at switch.

Pressure
Connection

VACUUM ONLY

Vacuum
Connection

1-630-784-1000 Fax: [phone] Page 2 of 4 P/N 1011083 06/10
1-800-253-2991