Advertisement
• 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. 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.
C7005A,B GAS PILOT AND FLAME ROD ASSEMBLIES
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
1
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
4-9/16 (115)
1/4-18 NPT
PIPE (NOT FURNISHED )
1 SPARK GAP BETWEEN IGNITION ELECTRODE AND GROUND MUST BE
1/8 TO 3/16 INCH (3.2 TO 4.8 mm).
Fig. 1. C7005 gas pilot and flame rod
assembly in in. (mm).
3
13-1/2
(342)
1-1/2
(31)
9-3/4
(247)
1/2-14 NPT
3/8-18 NPT
M3035A
60-2033—3
Advertisement
