Honeywell C7005A, C7005B Product Data

C7005A,B

Gas Pilot and Flame Rod Assemblies

PRODUCT DATA

FEATURES

• Used with Honeywell controls using the flame
rectification principle.

• C7005A is for continuous pilot applications. It includes
an insulated flame rod, properly positioned relative to
the flame retention type nozzle.

• C7005B is similar to C7005A, but includes an ignition
electrode suitable for automatic, electric-spark
ignition, gas pilot applications.

• Individually mounted flame rod and ignition electrode
in ceramic insulators allow the head assembly to fit
inside a 3-inch pipe.

• Stainless steel fins on the flame retention type pilot
head provide the correct ratio of flame rod area to
ground area for maximum flame signal, and are
beneficial in stabilizing the pilot flame.

GENERAL

The C7005A,B Gas Pilot Burner Assemblies include a flame
rod to prove the pilot flame. The assemblies are used with a
suitable flame safeguard control on industrial or commercial
gas burners or oil burners with gas pilots.

• Pilot flame retention nozzle and mixing tube are
threaded internally, 1/2-14 NPT and 3/8-18 NPT,
respectively, and can be assembled with standard pipe
fittings.

• Pilot can be installed in vertical, horizontal, or inclined
position.

• Rajah connectors facilitate electrical connections.

Contents

General ............................................................................... 1

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

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

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

Installation ........................................................................... 3

Adjustments and Checkout ................................................. 5

Operation ............................................................................ 8

Copyright © 1995 Honeywell Inc. • All Rights Reserved

60-2033-3

C7005A,B GAS PILOT AND FLAME ROD ASSEMBLIES

SPECIFICA TIONS

IMPORTANT

The specifications given in this publication do not
include normal manufacturing tolerances. Therefore,
this unit may not exactly match the listed
specifications. Also, this product is tested and
calibrated under closely controlled conditions, and
some differences in performance can be expected if
those conditions are changed.

Models:

C7005A Gas Pilot and Flame Rod Assembly—for

continuous pilot applications; includes flame rod only.

C7005B Gas Pilot and Flame Rod Assembly—for

automatic pilot applications; includes flame rod and
ignition electrode.

Pilot Head:

Flame retention type with stainless steel bomb type fins.
Threaded onto 1/2 x 6 inch (152 mm) pipe nipple with
1/2-14 NPT external threads.

Type of Gas:

Models available for use with natural and propane gases.

Gas Capacity (Varies with Gas Pressure):

Gas Pressure

in. wc

3 0.75 12.0 0.34
4 0.99 13.7 0.39
5 1.24 15.3 0.43
6 1.49 16.8 0.48
7 1.74 18.2 0.52

Flame Rod/Ignition Electrode Insulators:

Ceramic.

Maximum Temperature at Flame Rod Insulator:

500°F (260°C).

Capacity

kPa ft

3

/hr m3/hr

Flame Rod/Ignition Electrode Material:

Kanthal A-1 (2462°F [1350°C] maximum operating

temperature rating).

Optional: Stainless steel (2000°F [1093°C] maximum

operating temperature rating).

Electrical Connectors:

Rajah, male; companion connectors included.

Insulator Brackets:

Adjustable to change location of flame rod or ignition
electrode; lock securely using setscrew.

Mixing T ube:

Inspirating (Venturi type) with primary air adjustment.
Approximately 4-9/16 inches (116 mm) long, 1-3/4 inches
(44.5 mm) diameter. Inlet tapping 1/4-18 NPT; outlet tapping
3/8-18 NPT.

Mounting:

Vertical, horizontal, or inclined.

Dimensions:

Overall—Height 13-1/2 inches (343 mm); width can be

adjusted to pass through a 3-inch pipe.

Pilot Head—Length 4-7/16 inches (113 mm), diameter

1-5/8 inches (41.3 mm).

Spark Gap (C7005B only—1/8 to 3/16 inch (3.2 to

4.8 mm).

Approvals:

Underwriters Laboratories Inc. Listed: File No. MP268.
Canadian Standards Association Certified: C7005 only—

Master file LR-95329—1.

Industrial Risk Insurers acceptable.

Accessories;

• High Temperature Cable (for operation above 125°F
[52°C])—specify length:
— R1298020 Flame Rod Leadwire, rated up to 400°F

(204°C) for continuous duty.

— R1061012 Ignition Leadwire, rated at 350°F (176°C) for

continuous duty.

— R1239001 High Tension Ignition Leadwire, for

installations in a contaminating environment, rated at
200°F (93°C) for continuous duty.

ORDERING INFORMATION

When purchasing replacement and modernization products from your Authorized Flame Safeguard Distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number.

1. Order number.

2. High temperature cable, if required (specify length).

3. Ignition transformer, if required (C7005B only).

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 Home and Building Control Sales Office (check white pages of your phone directory).

2. Home and Building Control Customer Logistics
Honeywell Inc., 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386 [phone]

In Canada—Honeywell Limited/Honeywell Limitee, 740 Ellesmere Road, Scarborough, Ontario M1P 2V9 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.

60-2033—3

2

C7005A,B GAS PILOT AND FLAME ROD ASSEMBLIES

• Ignition Transformer, 6000 volts secondary (C7005B only):
— Part no. 22042; 120V, 60 Hz primary.
— Part no. 101079; 240V, 60 Hz primary.

Replacement Parts:

100204B Mixing Tube (Venturi type used with natural gas).
101867B Mixing Tube (Venturi type used with LP gas).
100205B Grounding Assembly
101738A Ignition Assembly—includes electrode, Rajah

connector and bracket (C7005B).
101738B Flame Rod Assembly.
101739 Ignition Electrode, 4 inch (102 mm), stainless

steel (C7005B).
101740 Flame Rod, 8 inch (203 mm) stainless steel.
103534 Flame Rod, 8 inch (203 mm) Kanthal.
101741 Connector—Rajah, plug end, 7/8 inch long.
101742 Clamp—for flame rod or ignition electrode mounting.
101743 Bracket—mounting.
14182 Washer—brass (plain), between Rajah connector

and flame rod or ignition electrode mounting.
37356 Connector—Rajah, socket end straight.
7617CV Insulator Assembly—includes electrode insulator

and mounting hardware.

INSTALLATION

CAUTION

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

2. Turn off the gas supply before beginning
installation.

3. Disconnect power supply to the flame safeguard
control before beginning installation to prevent
electrical shock and equipment damage. There
may be more than one disconnect involved.

4. All wiring must comply with applicable local
electrical codes, ordinances, and regulations.

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

6. Perform all required checkout tests after
installation is complete.

Mounting

If special provisions for mounting the pilot were made by the
burner manufacturer, carefully follow those instructions. If the
manufacturer did not supply instructions, use the
recommendations below.

Fig. 1 illustrates the use of a 90 degree reducing elbow (not
furnished) to provide a right-angle connection. Use a straight
reducing coupling or a 45 degree reducing elbow (not
furnished) for piping and mounting if more convenient.

Position the flame rod so that a weak pilot flame contacts the
flame rod only at the junction of the main burner flame and
pilot flame.

weak pilot flame that is incapable of igniting the main burner

(Fig. 2).

IMPORTANT

Do not position the flame rod so it can detect a

To assure an adequate pilot flame to ignite the main
burner, you MUST perform the pilot turndown test,
as described in the instructions for the flame
safeguard control.

Install the pilot so the pilot flame has full contact with the gas
stream from the main burner heads, jets or nozzles (Fig. 3,
4, 5). If it is necessary to prove both pilot and main flames,
mount the pilot so the flame travels in the same direction as
the air movement at the mounting point, rather than where
the air movement is at right angles to the flame travel. The
pilot should be mounted far enough forward so that the flame
rod just enters the envelope of the main burner flame. The
pilot can be mounted either beside or below the burner head.

Keep the pilot burner below or behind the main burner so that
the burner frame and refractory help protect the pilot from
radiant heat. Locating the pilot in the secondary airstream
also provides considerable cooling. The primary air
adjustment must be accessible and outside the high
temperature area.

On radiant type burners, the pilot is often mounted outside
the burner box. Fig. 3 shows the pilot assembly in a diagonal
channel cut through the brickwork and a straight-through
connection used to support the pilot. The flame rod is at the
junction of the main burner flame and pilot flame. The pilot
assembly can be mounted below or alongside the burner box
and an angle connection used so the pilot flame travels into
the main flame. The air mixer is normally mounted outside the
boiler.

FLAME ROD

FLAME GROUND

IGNITION ELECTRODE
(C7005B ONLY)

SPARK GAP

FLAME RETENTION NOZZLE

1/2 X 6 INCH (152.4 mm)
PIPE NIPPLE (1/2 -14 NPT
EXTERNAL THREADS)

RAJAH CONNECTORS

1/2-14 NPT X 3/8-18 NPT
ELBOW (NOT FURNISHED)

3/8-18 NPT PIPE
NIPPLE (NOT FURNISHED)

MIXING TUBE
(3/8-18 NPT X 1/4-18 NPT
INTERNAL THREADS)

PRIMARY AIR
ADJUSTMENT

1

1

4-9/16 (115)

1/4-18 NPT

PIPE (NOT FURNISHED

SPARK GAP BETWEEN IGNITION ELECTRODE AND GROUND MUST BE
1/8 TO 3/16 INCH (3.2 TO 4.8 mm).

)

1-1/2

(31)

3/8-18 NPT

13-1/2

(342)

9-3/4
(247)

1/2-14 NPT

M3035A

Fig. 1. C7005 gas pilot and flame rod

assembly in in. (mm).

3

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