Product Overview

2 P-3800 Product Bulletin
Operation
The P-3800 Reset Volume
Controller senses the total and
static pressures from the duct.
The difference between the total
and static pressures is the
velocity pressure. The P-3800
compares this velocity pressure
signal to the reset input signal
from a thermostat or some other
master controller. The force-
balancing principle of the
P-3800 allows the unit to
produce a nominal 0 to 20 PSIG
(0 to 140 kPa) output signal.
This output signal is used by the
damper actuator to position the
damper within the VAV box, in
order to control the volume of air
flowing through the duct.
Installation
The P-3800 Reset Volume
Controller is designed for
installation on any flat surface in
a vertical or horizontal plane.
For most retrofit/replacement
installations, because of the
universal body design of the
P-3800, the unit can simply snap
into the existing reset volume
controller mounting bracket. A
mounting bracket is furnished
with the P-3800 if the unit is to
be used in a new installation or
one in which the existing
mounting bracket cannot be
reused.
If the installation requires that
the P-3800 mounting bracket be
used, proceed as follows: Using
the bracket as a template, mark
the two mounting hole locations
on the surface. Drill a pilot hole
at each of the marked locations
for #10 sheet metal screws (field
furnished) and secure the
bracket in place.
Refer to Figs. 2 and 3 for
dimensional diagrams and
additional mounting details.
Continue with the
Commissioning section that
follows to complete the P-3800
installation and to adjust the unit
to the desired settings dictated
by the system drawing or job
requirements.
Specifications