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All wiring must comply with applicable electrical codes,
ordinances, and regulations. Use NEC Class 1 (Line
Voltage) wiring.
For normal installations:
For the ignition electrode, use high tension wire
•
electrically equivalent to type GTO-10, and rated
for the temperature and humidity encountered in
the application.
•
For the flame rod, use moisture-resistant no. 14
AWG wire suitable for at least 167°F (75°C) if
used with a flame safeguard primary control, or
suitable for at least 194°F (90°C) if used with a
flame safeguard programming control.
For high temperature installations:
•
For the ignition electrode, use Honeywell
specification no. R1061012 Ignition Cable or
equivalent. (This wire is rated at 350°F (176°C)
for continuous duty, and up to 500°F (260°C) for
intermittent use. It has been breakdown tested to
15,000 volts.)
•
For the flame rod, use Honeywell specification
no. R1298020 or equivalent. This wire is rated up
to 400°F (204°C)for continuous duty. It is tested
for operation up to 600 volts and breakdown up to
7500 volts.
For ignition installations in a contaminating environment, use
Honeywell specification no. R1239001 High Tension Ignition
Cable or equivalent. This wire is very resistant to severe
conditions of oil, heat, and corona, and is tested to withstand
high voltages up to 25,000 Vrms in a salt bath for one minute
without breakdown. It is rated at 200°F (93°C) for continuous
duty, and up to 350°F (176°C)for intermittent use.
Make connections to the flame rod and ignition electrode
(C7005B) using Rajah connectors. See Fig. 6 for typical field
wiring connections.
Connect the flame rod (see callout 1, Fig. 1) to the F terminal
of the flame safeguard control. Keep this leadwire as short as
possible; capacitance increases with leadwire length,
reducing the flame signal strength. The ultimate limiting factor
is the flame signal (see Table 1).
For a C7005B:
•
Use a 6000 volt 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 of the C7005B
(callout 3, Fig. 1) to the secondary high tension
terminal of the ignition transformer.
C7005A,B GAS PILOT AND FLAME ROD ASSEMBLIES
FLAME
ROD
IGNITION
ELECTRODE
(C7005B ONLY)
PILOT
BURNER
CASE
HEAD
GROUND
GROUND
Fig. 6. Typical field wiring diagram for C7005
gas pilot and flame rod assembly.
IMPORTANT
Do not run high voltage ignition transformer wires in
the same conduit with the flame rod wiring.
No ground leadwires are required. The flame ground and
flame retention nozzle (callouts 2 and 4, Fig. 1) act as the
ground electrode for the flame rod and the ignition electrode.
The case of the ignition transformer will act as the ground
connection when it is securely fastened to the burner.
ADJUSTMENTS AND CHECKOUT
Adjust the Air-Gas Mixture
IMPORTANT
For initial burner lightoff, consult the burner
manufacturer's instructions or the instructions for the
flame safeguard control.
With the gas pilot installed and the pilot burner running, adjust
the primary air adjustment (callout 10, Fig. 1) for an air-gas
mixture that provides the type of flame required for the
particular installation. Be sure you have the proper mixing
tube for the type of gas (natural or LP) being used. A
medium-hard flame generates the greatest response from the
flame detector circuit.
If air movement conditions are severe or change with
modulation, it may be desirable to operate the premixed pilot
on moderate to high gas pressure (normally not more than
one psi). This is particularly true when the main burner fires
with high pressure gas. Increasing the pilot pressure tends to
harden and lengthen the pilot flame, increasing its stability
under adverse draft conditions.
5
FLAME
SAFEGUARD
CONTROL
F
HIGH TENSION
TERMINAL
PRIMARY
SECONDARY
L2
6000 VOLT
IGNITION
TRANSFORMER
60-2033—3
M3034
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