Installation And Operation; Planning The Installation - Honeywell C7061 A Product Handbook

INSTALLATION AND OPERATION

PLANNING THE INSTALLATION

Proper flame detector application is the back of a safe and
reliable flame safeguard installation. Refer to the burner
manufacturer's instructions as well to those included here.
Follow all instructions carefully.
CAUTION
1. Do not connect these detectors to non-Ho-
neywell manufactured controls (primaries,
programmers, multiburner systems, and
burner management systems). Unsafe
conditions could result.
2. Disconnect power supply before beginning
installation to prevent electrical chock and
equipment damage. More than one disconnect
may be involved.
3. All wiring must be NEC Class 1 (line voltage).
4. Voltage and frequency of the power
supplyconnected to this detector must agree
with the values marked on the detector.
5. Sight the detector so it does not respond to
ignition spark.
6. On multiburner installations, each detector
must respond only to the flame of the burner it
is supervising.
IMPORTANT
Do not connect more than two C7061A/F flame
detectors in parallel.
Basic Requirements
The combustion flames of most carbon-based fuels emit
sufficient ultraviolet radiation to enable the C7061A/F Solid
State (Purple Peeper) ultraviolet flame detector to prove the
presence of a flame in a combustion chamber. The detector
mounted outside the combustion chamber. Its mounting
flange or union is threaded to one end of a sight pipe inserted
through the wall of the combustion chamber. The ultraviolet
sensing tube in the flame detector sights the flame through
the pipe.
When a flame is present, the UV tube in the C7061A/F senses
the ultraviolet radiation emitted. The C7061A/F produces a
signal that is sent to the amplifier in the flame safeguard
control. The amplified signal pulls in the flame relay in the
control to allow proper operation of the system.
Because it is necessary for the UV sensing tube to actually
see the flame, it is best to locate the detector as close to
flame as physical arrangement, temperature, and other
restrictions permit. These restrictions are described in detail
in the following paragraphs.
EN1C-0015SZ20 R0602
Determine the location
Before beginning the actual installation, estimate the best
location for mounting the detector based upon these factors:
1. Temperature
Install the flame detector where the surrounding temperature
will remain within the specified ambient operating
temperature ratings.
For the C7061A/F, to keep the detector temperature within
specifications. If the temperature rating is exceeded, the
introduction of cooling air will be necessary.
2. Vibrations
Do not install the detector where it could be subject of
excessive vibration; it shortens the life of the electronic
components. Vibrations with a magnitude greater than 1g
will require an anti-vibration mount to cushion the detector.
3. Clearance
Make sure there will be enough room to remove the cover of
the detector for servicing.
Radiation sources other than flame
Examples of radiation sourses, other than flame, which could
actuate the detection system:
Ultraviolet sources
• Radiant surfaces above 1200°C (2200°F).
• Sparks from ignition transformers and welding arcs.
• Gas lasers
• Sun lamps
• Halogen lamps
• Germicidal lamps
• lncandescent lamps held close to the sensing tube
• Filament above 1200°C (2200°F).
Gamma ray and X-ray sources
• Diffraction analyzers
• Electron microscopes
• Radiographic X-ray machines
• High voltage vacuum switches
• High voltage condensers
• Radioisotopes
Except under very unusual circumstances, none of these
sources, except a radiant surface or ignition spark, would be
present in or near the combustion chamber. The detector
may respond to a radiant surface at a temperature above
1200°C (2200°F) if both of the following conditions are present
the surface represents a significant percentage of detector's
field of view.
If the temperature or a radiant surface causes the flame relay
(in the flame safeguard control) to pull in, re-aim the sight
pipe so the detector views a cooler area, or the sensitivity of
the detector decreases. lgnition sparks is a rich source of
ultraviolet radiation.
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