Honeywell C7962B Product Data

C7962B
Visible Light Flame Detector

FEATURES

• Used with 7800 SERIES Flame Safeguard controls with
R7851B Flame Amplifier.

• Has an integral collar threaded (internal 1/2-14 NPSM)
for mounting on 1/2 inch sight pipe.

• Has 1/2-in. spud (1/2-14 internal thread) for electrical
conduit wiring.

• Conduit clamp provided for flexible conduit wiring.

APPLICATION

The C7962B Visible Light Flame Detector detects the visible
light emitted by fuel oil combustion flames. The C7962B
Detector is used with Honeywell 7800 SERIES Flame
Safeguard controls to provide fuel oil flame supervision in
commercial and industrial burners.

PRODUCT DATA

Contents

Application ........................................................................ 1

Features ........................................................................... 1

Specifications ................................................................... 2

Installation ........................................................................ 2

Ordering Information ........................................................ 2

Adjustments and Checkout .............................................. 6

Troubleshooting ................................................................ 6

Maintenance ..................................................................... 7

65-0277-03

C7962B VISIBLE LIGHT FLAME DETECTOR

WARNING

SPECIFICATIONS

Model:

C7962B Visible Light Flame Detector.

Electrical Ratings:

Connections:

Two eight-foot (2.44 meters) color-coded NEC Class 1

leadwires.

Environmental Ratings:

Ambient Operating Temperature:

-40°F to +165°F (-40°C to +74°C)

Storage Temperature Rating:

-20°F to +120°F (-29°C to +49°C).

Humidity:

90% relative humidity, noncondensing.

Vibration:

0.5G.

Maximum Pressure Rating:

5 psi.

Mounting:

Collar with 1/2-14NPSM (internal thread) for mounting on a

1/2 inch sight pipe.

3-7/8 (98)

3-3/8 (86)

COLLAR WITH 1/2-14 NPSM
INTERNAL THREADS

C7962B

Fig. 1. C7962B Visible Light Flame Detector

dimensions in in. (mm).

INSTALLATION

Electrical Shock Hazard.
Can cause serious injury, death or property
damage.

Disconnect power supply before beginning installation.
More than one disconnect may be required.

8 FOOT
(2.44 METER)
LEADWIRES (2)

SPUD CONNECTOR
(1/2-14 NPSM
INTERNAL THREADS)

(25)

1

M29272

Dimensions:

See Fig. 1.

Accessory:

32007439-001 Mounting Bracket and screws. (Included with

C7962B1010)
118367A Swivel Mount.
130413 Conduit Clamp (included)

Approvals:

Underwriters Laboratories, Inc. listed: File No. MP268, Vol.

30, 31
Canadian Standards Association (CSA): 95329.

When Installing This Product…

1. Read these instructions carefully. Failure to follow them
could damage the product or cause a hazardous
condition.

2. Check the ratings given in the instructions and on the
product to make sure the product is suitable for your
application.

3. Installer must be a trained, experienced, flame
safeguard control technician.

4. After installation is complete, check out product
operation as provided in these instructions.

Disconnect the power supply before beginning installation to
prevent electrical shock and equipment damage. All wiring
must comply with applicable electrical codes, ordinances and
regulations. Use NEC Class 1 (line voltage) wiring.

ORDERING INFORMATION

When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number.

If you have additional questions, need further information, or would like to comment on our products or services, please write or
phone:

1. Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory).

2. Honeywell Customer Care

1885 Douglas Drive North

Minneapolis, Minnesota 55422-4386
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Toronto, Ontario M1V 4Z9.
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France,
Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.

65-0277—03 2

WARNING

Explosion Hazard and Electrical Shock Hazard.
Can cause serious injury, death or property
damage.

1. The C7962B Flame Detectors must be used with
Honeywell flame safeguard controls (primaries,
programmers, multiburner systems, and burner
management systems). Using with controls not
manufactured by Honeywell could result in unsafe
conditions.

2. Disconnect power supply before beginning
installation to prevent electrical shock or equipment
damage. More than one disconnect may be
involved.

3. Read the installation instructions before starting the
installation.

4. All wiring must be NEC Class 1 (line voltage).

Basic Requirements for Flame Detector Installation

It is necessary for the detector to actually see the flame.
Locate the detector as close to the flame as physical
arrangement and temperature restrictions permit.

Sighting requirements for different types of flame supervision
are:

C7962B VISIBLE LIGHT FLAME DETECTOR

If a C7962B is to be used for a blast tube installation, its
location should be determined by the burner manufacturer.
Contact the manufacturer before making any modifications to
the installation.

Prepare Hole in Wall of Combustion Chamber

Cut 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 inch for every 3 inches
(25 mm for every 76 mm) of wall thickness.

Mounting the Sight Pipe (Fig. 2)

Thread one end of the pipe to fit the mounting collar on the
detector. Cut the pipe to the desired length (as short as
practicable) 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 permanently weld the sight pipe in place until
after completing the Adjustments and Checkout section.

NOTE: If you use a swivel mount (part no. 118367A) and you

are positive about the location and sighting angle, you
can permanently weld the pipe.

TEMPORARY
TACK WELD

1. Pilot flame only—Sighting must be along the axis of the
pilot flame. The smallest pilot flame that can be sighted
must be capable of igniting the main burner (see Pilot
Turndown Test).

2. Main flame only—Sighting must be at the most stable
part of the flame for all firing rates.

3. Pilot and main flame—Sighting must be at the junction of
both flames.

Mounting a C7962B Flame Detector

Locate the Sight Pipe

The location of the sight pipe is the most critical part of the
installation. A black iron pipe is recommended. Do not use a
stainless steel or galvanized pipe because the internal surface
blackens with use ad deposits from the combustion chamber
settle on it.

Under optimum conditions, the flame detector can detect most
oil combustion flames at a distance of six feet (1.8 meters).
The critical factors in determining the flame-detector distance
separation are the optimized flame signal (current or voltage)
and the flame detector temperature. Other factors may be
influential and are associated with the specific installation. For
minimum flame signals, see Table 1 and for ambient operating
temperatures, refer to Specifications, page 2.

Use 1/2 inch pipe for a C7962B. Since no two situations are
likely to be the same, length and sighting angle of the pipe
must be determined at the time and place of installation.
Generally, it is desirable to have the sight pipe tilting downward
to prevent soot or dirt buildup.

FLARED HOLE

BLACK IRON
SIGHT PIPE

REFRACTORY

M3019B

Fig. 2. Mounting sight pipe.

BOILER
PLATE

Sight Pipe Ventilation

It may be necessary to ventilate the sight pipe to cool the flame
detector or to clear the sight pipe of UV radiation absorbing
material such as smoke, excessive moisture or, in some
instances, unburned fuel.

For a negative pressure combustion chamber, drilling a few
holes in the section of the sight pipe outside of the combustion
chamber will allow air at atmospheric pressure to flow through
the sight pipe into the chamber. A perforated pipe nipple
between the sight pipe and the detector can also be used.
(See Fig. 3.)

For a positive pressure combustion chamber, connect a supply
of pressurized air from the burner blower through the sight pipe
into the chamber. The supply air pressure must be greater that
the chamber pressure.

Swivel Mount

To facilitate proper sighting of the flame, a swivel mount (part
number 118367A) is available. The swivel mount will require a
3/4 to 1/2 inch reducer and a 1/2 inch close nipple to mount a
C7962B. For mounting details, refer to form 50-0361 for the
118367A Swivel Mount.

3 65-0277—03