User Guide

SPC (Static Pressure Controller)
• Air Pressure Sensing Switch
• For use with PO/PC Dampers
• Adjustable Air Switch Set Point Range
Specifications
Mounting
. (See Figure 3)
Set Point 0.05 ± 0.02" w.c. to 2.0"w. c.
Range
Field Adj. 0.07”w.c. to 2 .0"w.c.
Operate Range
Field Adj. 0.04”w.c. to 1 .9"w.c.
Release Range
Field Adj. 0.07”w.c. to 2 .0"w.c.
Operate Range
Approx. Switching
Differential 0.02 ± 0.01”w.c. at minimum
set point to 0.1w.c. at maximum
set point.
Measured Media
Maximum Pressure ½ psi (0.03 b ar)
Operating -40ºF to 18 0ºF (-4 0ºC to 8 2ºC)
Temperature
Electrical 300VA pilot duty at 115 to
Rating 277 VAC, 15 Amps no n-inductive
277 VAC @ 60Hz
Contact SPDT
Arrangement
Sample Line ¼” B arbed co nnectors f or
Connections tubing
Approval UL, FM, CSA, CE
Mounting
Air Sample Connection
Initial-Position Relay
Select a mounting location which is free from vibration.
The SPC must be mounted with the diaphragm in any verti-
cal plane in order to obtain the lowest specified operating
set point. Avoid mounting with the sample line connections
in the “up” position. Surface mounting by the two 3/16“
diameter holes in the integral mounting bracket. The
mounting holes are 3 7/8” apart as shown in Figure 3.
The SPC is designed to accept a flexible tubing by means
of a barbed 1/4”slip-on connection. A 36” piece of ¼˝ ED
Flexible Tubing is included with the SPC as well as the
Pitot Tube for mounting in the plenum. Locate the sam-
pling probe a minimum of 2 feet down stream from the air
source. Install the sampling probe as close to the center of
the airstream as possible. Do not allow supply pressure to
blow directly into the Pitot Tube. Connect the provided
flexible tubing to the High-Pressure Inlet as shown in
Figure 2.
Each SPC includes a SPDT Relay that should be wired in
conjunction with the SPC and Power-Open/Power-Close
Damper as shown in Figure 1. This relay is included so
that when there is NO CALL for the FAN on the equipment
side of the Braeburn Zone Controller the bypass damper
will drive open. When a FAN call occurs the relay allows
SPC to operate normally.
The SPC is a static pressure switch designed to sense positive pressure in
the plenum for the purpose of controlling modulating bypass position.
The plated housing contains a diaphragm, a calibration spring and a snap-
acting SPDT switch. The barbed sample line connections located on each
side of the diaphragm accept flexible tubing. The enclosure cover guards
against accidental contact with the live switch terminal and set point adjust-
ing screws. The enclosure cover will accept a ½˝ conduit connection.
Pitot tube (air-probe) for mounting in plenum and 36 inches of flexible
¼ ˝ I.D. poly tubing is included with each SPC.
Initial Position Relay included to maintain open damper position during NO
FAN CALL (Not pictured).
Mount with the diaphragm in any
vertical plane.
Progressive increasing from
that will not degrade silicone
General Description
Braebu rn S ystems LLC, 221 5 Cornel l Avenue, Mont gomer y, I llin ois 60538 , U.S.A.
Tele phone (866 ) 268-55 9 9, Facsimi le (866) 268- 3611
Air or combustion by-products