BPE24 Installation Instructions #BPE24
© 2021 ZONEFIRST
FORM BPE
board. There are 4 key-hole mounting points in each corner
of the case. The case has openings in the rear of the case
as well as the side for all wiring. Wiring can come from the
back as well as the side in order to make a neat installation.
CONTENTS
The BPE24 includes 10 feet of pressure tubing (which can be
cut down to size).
OPERATION
The BPE24 controls up to 4 zones on a single HVAC unit.
When the BPE24 gets a signal from the Zone Controller that
a zone damper is to be powered open it immediately opens
the corresponding zone damper(s) on the output terminals.
Anytime the BPE24
’s pressu
re sensor detects the pressure in
the supply plenum is higher than the Upper Limit Set Point it
will modulate the closed zone dampers open to relieve the
excess pressure into those zones. As these dampers
modulate open the air pressure should drop below the high
set-point and the zone dampers stop. When the BPE24
’s
pressure sensor is below than the Lower Limit Set Point it will
close the zone dampers. Once the pressure has equalized
to higher than the Lower Limit set point and lower than the
Upper Limit set point the BPE24 will signal the dampers to
stay in their current position.
IMPORTANT: When the dampers are being modulated or
signaled to stop the LEDs on the zone dampers may not be
illuminated. This is completely normal and the LEDs will only
illuminate when the damper is fully open (green) or fully
closed (red).
Upper Limit
The Upper Limit is adjus
table from 0.25”WC to 2”WC.
This
is the limit that once exceeded all dampers in the closed
zones will begin to modulate open. To enter the Upper Limit
menu from the main status display press SW1 and using
SW1 and SW2 you can raise or lower the Upper Limit.
Once you have finished setting the upper limit the menu will
automatically exit after 5 seconds back to the main screen.
Lower Limit
The Lower Limit is adjustabl
e from 0.15”WC to 1.90”WC.
This is the limit that once the pressure drops below it all
dampers in the closed off zones will begin to modulate
closed. To enter the Lower Limit menu from the main status
display press SW2 and using SW1 and SW2 you can raise
or lower the Lower Limit. Once you have finished setting the
lower limit the menu will automatically exit after 5 seconds
back to the main screen.
Dead Band
There is a minimum
0.10”WC
dead band between the
upper and lower limits that insures there is a sufficient
pressure range that can be maintained for the dampers to
modulate properly without constantly opening and closing to
maintain pressure.
Sensor Calibration
The pressure sensor is factory calibrated but due to the
differences in elevation it may be a good idea to calibrate
the pressure sensor in the location it is installed. The
important thing to note is that if the sensor is calibrated with
the HVAC unit running or in a windy environment it can lead
to a bad calibration measurement.
To calibrate the pressure sensor press and hold both SW1
and SW2 if the unit does not immediately show the
“Calibrating Please Wait”
try pressing the upper button first
then the lower button while still holding the top button. As
soon as the calibration message appears release the buttons
and calibration only takes approximately 6 seconds from
there.
Display
The LCD Display will display the status of the zones OP
(open), CL (closed), or a number from 01 to 99 to indicate
what percent the zones that were in the closed position were
modulated open in order to relieve the excess air from the
ductwork. If a zone is available for modulation that means
that the Zone control board is sending a close signal to the
BPE24. In the upper right hand corner the display will read P
in with the pressure reading being displayed just below it.
Transformer
–
A 24 Volt AC, 40VA Transformer is
recommended to power the BPE24 and can be the same
transformer powering the zone control panel.
24V
T
R
A
N
S
C
R
C
R
T24 -24V 40VA
TRANSFORMER
PRESSURE SENSOR
The BPE24 pressure sensor is a very sensitive device, never
blow into the sensor with your mouth as the amount of
pressure that the human body can produce far exceeds the
limitations of the sensor and it can be damaged that way. If
there is a need to test the sensor simply fold the pressure
tube on itself and squeeze as this will create a gentler
pressure increase on the sensor
TROUBLESHOOTING
