Dwyer Instruments 1996 Series Manuel utilisateur

Series 1996 Gas Pressure Switches are

reliable and convenient switches for gas-fired furnaces

and equipment using natural, manufactured or LP gas.

Both models (Model 1996-5, with a pressure range of 1.4

to 5.5″ w.c.; Model 1996-20, with a pressure range of 4

to 20″w.c.) feature visible set point and on-off

indicators.

OPERATION

Pressure acting on the power diaphragm rotates the

amplifying lever, which in turn extends the range spring

and rotates the snap switch input lever. When the set

point is reached, the snap switch is actuated and the

electrical contacts make or break. Decreasing pressure

after the switch has been actuated reverses the action,

de-actuating the switch and returning the contacts to

their normal position.

INSTALLATION

1. Select a location free from excessive vibration and

corrosive atmosphere. These switches may be used in

ambient temperatures as low as - 30°F ( - 34°C) and as

high as 110°F (43°C).

2. Mount switch with diaphragm in a horizontal position

and gas pressure connection at bottom. Connect the

switch to the source of gas pressure using either the

NPT (F)8″or NPT (M) 4″thread. Gas pressure connec-

tion should always be to bottom connection of switch—

see diagram above—which is equipped with a restrictor

orifice. Be sure to hold or turn switch with a wrench on

the hex portion of the bottom connection. This will pre-

vent applying excessive torque to the bottom fitting,

which could damage the switch.

The port identified with the letters LO-PR is used as a

vent in fuel gas switches and should be vented to

outside atmosphere or the combustion chamber in

accordance with the furnace manufacturer’s

instructions. The port identified by the letters HI-PR is

not used in fuel gas switches and is neither tapped nor

connected to the diaphragm chamber.

Series 1996 – Natural and L.P. Gas Pressure Switches

Specifications - Installation and Operating Instructions

Bulletin E-58

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

Lit-By Fax: 888/891-4963

Series 1996 Gas Pressure Switches

are designed for use with natural, man-

ufactured or LP gas or air.

Note set point adjustment indicator win-

dow. For quick adjustment of set point

before/after installation, turn adjustment

screw until red bar is at desired set point.

To adjust for low gas pressure interlock

service, refer to chart (other side).

Connections, dimensions and visible

on-off indicator: Model 1996-20 and

Model 1996-5 Gas Pressure Switches.

PHYSICAL DATA

Temperature limits: 32°F/0°C (- 30°F/- 34.4°C for dry gas or

air) to 110°F/ 43.3°C

Pressure connection: 8″NPT (F) or 4″NPT (M)

Vent connection: 8″NPT

Electrical rating: 15 amps, 120-480 volts, 60 Hz. A.C.

Resistive 8″H. P. @ 125 volts, 4″H. P. @ 250 volts, 60 Hz.

A.C.

Wiring connections: 3-screw type, Common, Normally Open

and Normally Closed

Set point adjustment: Screw type with visible indicator,

inside cabinet enclosure

On-off indicator: In window, on exterior of conduit enclosure.

Shows at a glance whether pressure is above or below set

and reset points.

Housing: Aluminum die casting and steel stamping,

zinc-plated for 200 hour salt spray resistance

Diaphragm: Molded Buna-N

Calibration spring: Stainless Steel

Weight: 1 lb, 2 oz

U.L. and C.S.A. listed, F.M. approved

3-1/8

[79.38]

3-1/2

[88.90]

1/8 (F) GAS

PRESSURE CONNECTION

1/4 NPT EXTERNAL THREAD

(ALTERNATE GAS CONNECTION)

VENT CONNECTION

ON OPPOSITE SIDE

WINDOW AND VISIBLE

ON-OFF INDICATOR

7/8 [22.23] OPENING FOR

1/2 [12.7] CONDUIT CONNECTION

REMOVABLE CONDUIT

ENCLOSURE COVER

WARNING:

Do not connect fuel gas to LO-PR port.

new E-58 REV 1 6/24/02 8:47 AM Page 1

3. Remove the snap-on cover from the conduit

enclosure by loosening its retaining screw and pulling

firmly on its set screw held end. Electrical terminals for

all switches are marked Common, Normally Open, and

Normally Closed. The switch is not actuated until

pressure is applied. On rising pressure, the switch actu-

ates and Normally Open contacts close. Should gas

pressure fail, the switch (when set for low gas pressure)

will de-actuate and the Normally Open contacts re-open.

When set for high gas pressure (regulator failure) the

switch will actuate (and Normally Closed contacts will

open) when overpressure occurs. Wire switch accord-

ingly: make sure load doesn't exceed electrical ratings.

Use flexible or rigid conduit to enclose wires to switch.

4. Adjust the set point following instructions under

adjustment.

5. Check carefully for leaks. Be sure that switch set

point and installation complies with the furnace/burner

manufacturer’s instructions. Watch the On-Off indicator

in window to observe proper operation.

ADJUSTMENT

1. To change the set point, remove the cover from the

conduit enclosure. Turn the slotted Adjustment Screw at

the end of the range spring housing clockwise to raise

the set point pressure and counter-clockwise to lower

the set point. The visible set point indicator shows the

set point from 4 (min) to 20 (max) inches w.c. for Model

1996-20 and 1.5 (min) to 5 (max) inches w.c. for Model

1996-5.

2. (a) For high gas pressure applications, to actuate on

regulator failure, adjust the set point so that desired set-

ting (normally 1″or 12″above operating pressure)

shows in the window.

(b) For low gas pressure applications, to actuate on gas

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

Lit-By Fax: 888/891-4963

Series 1996 – Natural and L.P. Gas Pressure Switches

Specifications - Installation and Operating Instructions

Bulletin E-58

Page 2

Visible on-off

pointer indi-

cates actuation

or de-actuation

of switch. This

permits instant

trouble-shoot-

ing of electrical

circuit or gas

supply.

Motorized

Gas Valves

Typical Piping Diagram for Gas-Fired Furnaces

(Pilots Not Shown)

Low Pressure

Gas Switch

Vent outside

separately or to

combustion chamer

per manufacturer's

instructions.

Gas

Supply

Main Gas

Shut-Off Valve Gas Pressure

Regulator

Solenoid

Vent Valve

(Normally Open)

Test

Cock High Pressure

Gas Switch

Checking

Gas Cock

To Main

Burner

Inches in Water Column

Set Point Approximate Dead Band Reset Point

Model 1996-5

1.5 0.10 1.30

20.12 1.88

30.14 2.86

4 0.17 3.83

50.19 4.81

Model 1996-20

40.15 3.85

50.15 4.85

10 0.24 9.76

15 0.33 14.67

20 0.41 19.59

pressure failure, adjust the set point slightly below

(usually 2″ or 1″w.c.) the normal gas pressure.

De-actuation will occur at set point pressure minus the

dead band. See chart below.

MAINTENANCE

The moving parts of these switches are sealed in and are

permanently tamper-proof. The single adjustment is that

of the set point. Care should be taken to keep the switch

reasonably dry and free from dust or dirt. No lubrication

or unusual precautions are required for

normal use.

new E-58 REV 1 6/24/02 8:47 AM Page 2

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