Braeburn-spc-back, Modulating bypass setup electrical connections – Braeburn SPC User Manual

Page 2

Figure 1 – Wiring Diagram

Modulating Bypass

Setup

Electrical Connections

Figure 2 – Dimensions

Figure 3 – Mounting

With all zones calling (all dampers

open), make certain that the fan is

in the highest speed that will be

used when the sysem is running.

Turn the set screw clockwise ¼

turn each time until the bypass

damper motor is obviously running

closed. If the bypass damper

should reverse and start opening,

turn the set screw another ¼ turn

and repeat until the damper is

closed. Next, slowly turn the set

screw counter clockwise until the

bypass damper motor start to run

open. Immediately, turn the set

screw clockwise until the damper

motor starts to close again.

The goal is to set the bypass

damper so that it is barely staying

closed when all zones are open.

This will cause the bypass damper

to open if supply dampers close

and the plenum pressure goes up.

As dampers open and/or close

during operation, the static pres-

sure sensor will sense a pressure

change and make the Power

Open/Power

bypass

damper move to maintain the

same pressure in the plenum that

was established when all zone’s

were open.

Braeburn Systems LLC, 2215 Cornell Avenue, Montgomery, Illinois 60538, U.S.A.

Telephone (866) 268-5599, Facsimile (866) 268-3611

Before pressure is applied to the diaphragm, the switch contacts on the SPC will be

in the normally closed (NC) position. This snap switch has screw top terminals with

cup washers. Wire according to

Figure 1.