Installing The Detector - Honeywell C7076A Operating Instructions Manual

9 InstALLInG tHe DeteCtoR

9.1 When installing this product...
➔ Installer must be a trained, experienced, flame safeguard control
technician.
➔ After installation is complete, check out product operation as
provided in these instructions.
WARnInG
Electrical shock hazard.
Can cause serious injury, death or equipment.
– Disconnect power supply before beginning installation to
prevent electrical shock and equipment damage. More than
one disconnect may be involved.
– All wiring must comply with applicable local electrical codes,
ordinances and regulations.
– All wiring must be NEC Class 1 (line voltage).
– Voltage and frequency of the power supply connected to this
detector must agree with the values marked on the detector.
– If an air supply is connected to the aspirator on the C7076A,
its pressure must equal or exceed that required to seal off the
detector from the combustion chamber.
– On multiburner installations, each detector must respond only
to the flame(s) produced by the burner it is supervising.
– Do not connect more than two detectors in parallel to a single
R7886 Dynamic Self-Check Ultraviolet Amplifier.
– Perform all required adjustments
9.2 selecting and installing sightpipe
After you have determined the approximate location and sighting
angle, select the sight pipe.
➔ A black iron pipe is recommended to provide reliable flame sens-
ing. Stainless steel and galvanized pipes have bright surfaces that
initially transmit ultraviolet radiation very well. However, their ability
to transmit ultraviolet radiation will decay when the bright surfaces
become dull with age or contamination, and flame detection will
become less reliable with time.
The aspirator on the faceplate of the C7076A is tapped for a 1-inch
NPT threaded pipe.
➔ A larger pipe may be necessary to obtain proper performance;
an diameter other than 1 inch will require a reducer coupling. The
geometry of the sight pipe affects the performance of the detector.
If the flame signal is too small, reduce the length or increase the
diameter of the pipe to increase the field of view of the detector. If
a sight pipe longer than 1 foot is required, use a 2-inch diameter
pipe with the reducer as close to the detector as possible.
1 Cut a hole of the proper diameter for the sight pipe in the burner
front or windbox at the selected location. The hole should be at
least 2 inches in diameter to allow adjustment of the sighting
angle.
2 If register vanes interfere with the desired line of sight, trim the
interfering vane(s) to assure an unobstructed view of the flame.
3 Cut the pipe to the desired length.
4 Thread one end of the pipe to fit the desired mating component;
i.e., reducer coupling, aspirator on the faceplate of the C7076A
aspirator.
5 Insert the other end of the pipe into the mounting hole, align it to
the desired sighting angle, and tack weld it in position.
➔ When initially mounting the pipe, tack weld it in place to allow
further sighting adjustments. Make sure the tack weld will support
the weight of the detector when it is installed.
➔ When installing a C7076A Detector, a Swivel Mount is recom-
mended to facilitate sighting the flame properly.
9.3 Mounting the aspirator
The aspirator on the faceplate of the C7076A Detector screws directly
onto the 1-inch NPT threaded pipe.
1 Remove the aspirator from the C7076A Detector by removing
the hinge pin.
2 Use an adjustable wrench to tighten the aspirator onto the pipe.
➔ For alternate mounting methods and further information refer to
figure below.
Installing the sight pipe for the C7076A detector
1 inch (25) NPT
threads
1 inch (25) NPT
sight pipe
3/8 inch (9) NPT
threads
Direct mounting
Sight pipe
1 inch (25) NPT
large than
close nipple
1 inch (25)
diameter
Reducer
Using a reducer or larger pipes
Furnace
wall
2 inch (50)
nipple
Swivel
Mounting
ball
flange
Using a swivel mount
9.4 Mounting the detector
1 Mount the detector on the faceplate by placing the detector on
its hinge and re-inserting the hinge pin.
Install 1/2 inch flexible conduit to the detector as follows:
2 Loosen the four captive screws in the front coverplate (with the
viewing lens) and remove the plate.
3 Install a flexible conduit fitting in the opening in the bottom of the
detector.
Water tight
conduit
fitting
Connecting the watertight flexible conduit
EN-5
Aspirator
Faceplate
Air supply
Aspirator
Faceplate
3/8 inch (9) NPT
threads
Air supply
1 inch (25)
Aspirator
close nipple
Faceplate
Nut
3/8 inch (9) NPT
Air supply
threads
Terminal block
Flame detector
wires
Lock nut
Flexible
conduit