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PRODUCT DATA

Copyright © 1995 Honeywell Inc.   •   All Rights Reserved

C7005A,B

Gas Pilot and Flame Rod Assemblies

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.

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.

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.

60-2033-3

Contents

General ............................................................................... 1
Features ..............................................................................

1

Specifications ......................................................................

2

Ordering Information ...........................................................

2

Installation ........................................................................... 3
Adjustments and Checkout .................................................

5

Operation ............................................................................

8

Summary of Contents for C7005A

Page 1: ...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 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 Raj...

Page 2: ...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 Capacity kPa ft3 hr m3 hr 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...

Page 3: ...burner flame and pilot flame Do not position the flame rod so it can detect a weak pilot flame that is incapable of igniting the main burner Fig 2 IMPORTANT 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 fro...

Page 4: ...icient spacing is usually available so the pilot can be mounted as illustrated in Fig 5 to simultaneously light as many burners as possible If available space does not allow central mounting within the burner box see Fig 3 M3036 THE FLAME ROD SHOULD BE LOCATED ON EITHER SIDE OR BELOW THE PILOT NOTE W R O N G M3038 Fig 2 Improper position of flame rod M3037 Fig 4 Typical mounting of gas pilot and f...

Page 5: ...lt ignition transformer with the same electrical ratings as the power supply of the flame safeguard control Select the appropriate Honeywell transformer or its equivalent For 120V 60 Hz use part no 22042 For 240V 60 Hz use part no 101079 Connect the primary leadwires of the ignition transformer between the ignition and the L2 terminals of the flame safeguard control Connect the ignition electrode ...

Page 6: ...to 4 times a second from bright to dim If the lamp is on or off continuously while reading the flame signal replace the amplifier Fig 8 Measuring flame signal voltage of 7800 SERIES control G The meter reading must be as specified in Table 1 after all tests are completed and all adjustments are made With the Honeywell 7800 Series controls the flame signal is measured in Vdc The voltage flame signa...

Page 7: ...s caused by moisture soot or accumulated dirt Make sure there is enough ground area the flame rod is properly located in the flame temperature at the flame rod insulator is no greater than 500 F 260 C ignition interference is not present see Ignition Interference Test below Make sure that the flame adjustment is not too lean If necessary reposition the flame rod If you cannot obtain proper operati...

Page 8: ...ast one complete cycle to verify operation OPERATION The C7005B Gas Pilot and Flame Rod Assembly includes an ignition electrode and a flame rod The operation of these two electrodes in a simple electrically operated gas pilot installation is as follows At the beginning of the starting cycle a high voltage from the secondary winding of the ignition transformer is applied to the ignition electrode A...

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