25
BYPASS DAMPER with INTEGRATED PRESSURE CONTROL
(Part # STBP or STCDBP)
Bypass Damper with Integrated Pressure Control is used to control bypass operations. The bypass damper
modulates to maintain static pressure as zone dampers open and close. The bypass system reduces air noise
from the supply registers caused by excessive air velocity. If the system is configured for intermittent fan mode and
the system satisfies, there will be a 3-minute delay to allow for system purge, after which the bypass damper will
open to 25%, preventing noisy rush of air through supply registers when fan starts up on a call for heat or cool. If
the system is configured for fan continuous operation, the
STBP
(Round) or
STCDBP
(Rectangular) Electronic
Bypass will monitor static pressure continuously, providing constant control of system static.
INTEGRATED PRESSURE CONTROL
DESCRIPTION
A. Supply air tube
B. 24vac R and C
C. Damper Terminal RO, RC, MC
D. LED lights
E. Adjustable Potentiometer
F. TP1 Test Point
Fig. 1
BYPASS DAMPER INSTALLATION
1. Verify the bypass damper is sized properly to the
system and not undersized. (Bypass damper
sizing is recommended for 100% of system CFM.)
2. Bypass damper and controller are powered by a
dedicated 24vac 40VA transformer.
3. Do not install the bypass damper outside.
4. Locate the Integrated Pressure Control (
IPC
) and
air tube on the bypass damper.
5. Drill ¼” hole into the side of the supply duct 2’
after the bypass and before the 1
st
supply take-
off. Mount pressure supporting block over ¼”
hole, align hole in block with hole in duct. Use
provided sheet metal screws.
6. Install air tube into supply air duct by slipping
supplied plastic tubing into holes in support block
and duct. Slip tube 3” into the duct. Pickup
tubing fits snugly into provided hole.
7. Connect pressure tube from static air pickup to
Integrated Pressure Controller (port closest to
you).
Fig. 2
BYPASS DAMPER WITH INTEGRATED BYPASS
CONTROL SETUP
1. Run all supply dampers to the full open position
and have blower motor running at 100% fan
speed. (See Note #1)
2. Manually close the bypass damper by pressing
in the release lever on the motor side of the
actuator. With the release lever pressed, rotate
the damper actuator collar to close the damper
and release the lever to lock the damper closed.
3.
Quick Set Option:
Turn the potentiometer on
the damper control board to the full left position
and slowly rotate RIGHT, until the “RC” RED
LED turns on. Now rotate LEFT just slightly, until
RC LED turns off. The
IPC
is ready for
operation.
“
RC
” RED LED means damper closing.
“
RO
” GREEN LED means damper opening.
INTEGRATED PRESSURE CONTROL SETUP
