RF Baghouse, Models RFWP and RFWPH
60
Electrical installation, service,
or maintenance work must be
performed by a qualified electrician and comply
with all applicable national and local codes.
Turn power off and lock out electrical
power sources before performing service or
maintenance work.
Do not install in classified hazardous
atmospheres without an enclosure rated for the
application.
The Photohelic combines the functions of a differential
pressure gauge and a pressure-based switch. The gauge
function measures the pressure difference between the
clean-air and dirty-air plenums and provides a visual display
of filter condition. The high-pressure tap is located in the
dirty-air plenum and a low-pressure tap is located in the
clean-air plenum. The pressure-based switch function provides
high-pressure ON and low-pressure OFF control of the filter
cleaning system.
1. Choose a convenient, accessible location on or near
the collector for mounting that provides the best visual
advantage.
2. Mount the gauge to the remote panel or door using the
mounting ring, retaining ring, and four #6-32 x 1 1/4-in
screws. Do not tighten screws. Connect two, 1/8-in NPT x
1/4-in OD male adapters to the gauge’s high- and low-
pressure ports. Tighten screws.
3. On the back of the gauge, remove four #6-32 x 5/16-in
screws and plastic enclosure. Set aside. Add two jumper
wires supplied by customer. Remove the jumper from the
pressure switch located on the timer board, if equipped.
Using the 3/4-in conduit opening, wire the gauge as
shown. Reassemble and fasten enclosure securely.
4. Thirty-five feet of plastic tubing is supplied and must be
cut in two sections. Connect one section of tubing from the
gauge’s high-pressure port to the pressure fitting located
in the dirty-air plenum. Connect remaining tubing from
the gauge’s low-pressure port to the fitting in the clean-
air plenum. Additional tubing can be ordered from your
representative.
5. Zero and maintain the gauge as directed in the
manufacturer’s Operating and Maintenance Instructions
provided.
6. To install the Photohelic Gauge mounted in a NEMA 4,
Weatherproof Enclosure, follow Steps 4 and 5.
Photohelic gauge
solenoid
valves
Pressure Switch
terminals
neutral
110-V
jumper wires
supplied by customer
timer
board
L1 L2
1 2 3
sol
com
L2
L1
HI
LO
C NO
NC
NC NO C
C NO NC NC NO C
Photohelic Gauge Wiring Diagram
Photohelic Gauge in Optional NEMA 4
Weatherproof Enclosure
Note:
For use with solid-state timer only. All parts, except
the mounting bracket shown in the Photohelic Gauge
Standard Installation drawing are included with the
NEMA 4, Weatherproof Enclosure.
Photohelic
®
Gauge
