Honeywell C7061M Product Data page 6

C7061M MINIATURE DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR
Prepare Hole in Combustion
Chamber Wall
Cut or drill a hole of the proper diameter for the sight pipe in the
wall of the combustion chamber at the selected location. Flare
the hole to leave room for small adjustments of the sighting
angle. The taper of the hole should be about 1 in. for every 3 in.
(25 mm for every 76 mm) of wall thickness.
Mount Sight Pipe
Thread one end of the pipe to fit the 1 in. mounting nut, or
required coupling. Cut the pipe to the desired length (as short
as practical) and at an angle so it fits flush with the wall of the
combustion chamber. Tack weld the pipe to the wall in a trial
position. Do not weld the sight pipe permanently in place until
after completing the Adjustments and Checkout.
NOTE:If you use 118367A Swivel Mount and you are positive
about the location and sighting angle, you can permanently
weld the pipe.
Install Fittings
In some cases, the sight pipe does not directly fit the C7061
mounting nut. Also, it may be desirable or necessary to
ventilate the sight pipe. You may also want to use a swivel
mount or an antivibration mount. Each of these cases can
require additional fittings.
Reducer
For sight pipes of larger diameter than the mounting nut, install
a reducer as illustrated in Fig. 4. The reducer requires a close
nipple with 1 in. NPT external threads:
65-0304—05
BLACK IRON SIGHT
PIPE [USE 1-1/2 TO
3 INCHES (38 TO
76 MM) DIAMETER].
FURNACE
WALL
TAPERED
MONITORING
HOLE
NOTE: IF AIR PURGING IS NEEDED, ADD PERFORATED NIPPLE OR PIPE TEES TO
SUPPLY VENTILATION.
Fig. 4. Typical mounting of C7061M.
REDUCING
SOCKET
TEES
AIR
CONNECTION
NIPPLE (1B)
WELD
THIS PART
BURNER
PLATE
Sight Pipe Ventilation
It may be necessary to ventilate the sight pipe to cool the
detector or to clear a viewing path through UV radiation
attenuating material.
For a negative pressure combustion chamber, drilling a few
holes in the section of the sight pipe outside of the combustion
chamber allows air at atmospheric pressure to flow through the
sight pipe and into the chamber. A perforated pipe nipple
between the sight pipe and the detector can also be used.
For a positive pressure combustion chamber, connect a supply
of pressurized air from the burner blower to flow through the
sight pipe and into the chamber. The air pressure must be
greater than the chamber pressure (see Fig. 4).
Mount the Detector
Mount the detector onto the sight pipe, reducer, or other fitting
(see Fig. 4, 5, 6).
NOTE: The C7061 Self-Checking Flame Detectors incor-
porate a shutter mechanism and, therefore,
require special consideration for mounting posi-
tions other than vertically sighting downward, as
illustrated in Fig. 5 & 6.
— The C7061 has an arrow indicator on the back of
the cover to facilitate mounting (see Fig. 5). The
arrow must be vertically aligned and pointing
downward.
— The C7061 must be mounted with the conduit
opening located 90 degrees below the horizontal
(see Fig. 5 & 6) pointing down.
— While the C7061 may be mounted as much as 45
degrees below the horizontal plane as shown in
Fig. 5, this may increase the likelihood of soot
buildup on the viewing window.
6
M29116A