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SUBMITTAL SHEET

Forced Air Zone Controls

Model PS4

EBD (Static Pressure Switch)

The PS4 is used to sense the static pressure in the supply

air duct and maintain the static pressure set point limit

that the system will operate at. The PS4 will control an ND

or URD damper, to allow an adequate amount of pressure

to by-pass from the supply plenum to the return duct or

dump zone, and maintain design static pressure and

velocity. The PS4 has a range of 0.1" to 4.0" W.C. The PS4

can be used with motor actuators to create model EBD by-

pass dampers.

Adjustment of the Switch

After mounting the pitot tube and diaphragm in a suitable location (The pressure switch should be

mounted with the graduated stem in a vertical position. The pressure switch cannot be mounted

sideways or upside-down), connect the tubing from the pitot tube, to the high pressure tap on the

diaphragm. Use the barb connector as shown. Leave the low pressure tap open to atmosphere. (See

drawing on page 2). Wire the PS4 to the bypass damper as shown on page 2. Remove cover from

diaphragm switch to make your field connections. Make sure the zone system is operating properly

and all zone dampers are in the open position. Power up the bypass damper assembly. Unscrew and

remove the cap on the PS4 diaphragm. Turn the static pressure adjusting screw up or down until the

top of the screw lines up with the static pressure scale setting you require. (Factory setting is .5”

W.C.) Observe that the bypass damper should be closed when all zone dampers are open. If the

bypass damper is open or partially open, adjust the set point for a higher static. Then, start to close

off one or more zone dampers and observe the bypass damper as the static pressure control senses

the increased air pressure and modulates the bypass damper open or closed to maintain the static

pressure set point you require.

Package includes:

1 - Pressure Diaphragm

1 - 3/8” barb connector

1 - wiring harness

1 - Mounting bracket

1 - Bolt/washer

1 - Pitot tube

1 - 8’ length tubing

2 - wire connectors

6 -1/4” screws

Note: The pressure switch should be mounted as close to vertical as possible to ensure proper

operation.

385 Hwy. 33

Englishtown, NJ 07726

Ph: 800-446-3110

Fx: 732-446-5362

P/N 090377A0063 REV.H 10.30.09

CONTROLS INC.

Excellence Without Compromis

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SUBMITTED BY:

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Summary of content (2 pages)

PAGE 1
TM ® Forced Air Zone Controls SUBMITTAL SHEET Model PS4 EBD (Static Pressure Switch) The PS4 is used to sense the static pressure in the supply air duct and maintain the static pressure set point limit that the system will operate at. The PS4 will control an ND or URD damper, to allow an adequate amount of pressure to by-pass from the supply plenum to the return duct or dump zone, and maintain design static pressure and velocity. The PS4 has a range of 0.1" to 4.0" W.C.
PAGE 2
SUBMITTAL SHEET TM ® Model PS4 EBD (Static Pressure Switch) Forced Air Zone Controls Field Wiring “EBD” ELECTRONIC BYPASS MOTOR AND STATIC PRESSURE CONTROL DAMPER ASSEMBLY MA-ND4 MOTOR 1 4 6 PS4 PRESSURE SWITCH WIRE NUT NO NC C Separate 24 vac 20 va Transformer Or Connect to any M1/M2 on the EWC Controls Zone control panel. Note: Remove cover off of diaphragm to field wire. ADJUSTMENT SCREW LO-PRESSURE PORT. LEAVE OPEN TO ATMOSPHERE 3 13 25 .1 .5 1 50 2 75 3 102 MM W.C. 4 CAP IN W.C.