Chapter 5 — Service and Maintenance
5-4 Part No. 750-263
D.IGNITION ELECTRODE AND FLAME ROD
The ignition and ionization electrodes should be checked on an
annual basis. If damaged it should be replaced as shown in Figure
5-5 with the electrode turned towards the burner mantle after it is
inserted into the burner head.
1/8” gap between ionization electrode and the surface of the burner
canister.
1/8” gap between ignitor electrode and ground electrode.
E. TROUBLESHOOTING
Lockout Conditions
1. Observe lockout code and description - refer to CB Falcon appendix if
necessary.
2. After determining lockout condition, investigate possible causes.
3. When cause is diagnosed, remedy condition.
4. Reset control. Boiler should be able to start normally.
5. If lockout recurs, further investigation is required. Repeat steps 1
through 4 as needed. If necessary, contact your CB service representa-
tive for technical support.
EXAMPLE: Lockout 79 Outlet Temperature High Limit
1. Before resetting control to clear lockout, check for sufficient water flow
through boiler. Possible sources of insufficient flow include closed
water valves, insufficient pump speed, air trapped in boiler (inadequate
air venting), or modulation set point and off point close to outlet high
limit setting.
The CB Falcon system display/interface provides extensive boiler
diagnostic data at the time of lockout that can help in determining
the source of a problem. This information is accessed through the
Lockout History.
2. Remedy condition that caused lockout to occur.
3. Reset control by pressing <Clear Lockout> from the Lockout History
screen.
Light-off Problems
The distance between the flame rod and the burner (mantle) should
be 1/8” (see Figure 5-6). The dimensions on both the booster
ignitors and the flame rod are not easily adjustable - bending the
rods can cause damage to the insulation material. Also a bent
electrode will return to its original shape when heated. If an
electrode or flame rod is out of specification, replacement is
generally required. Clean or replace as necessary.
Figure 5-5 Electrode Setup
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