S8700B,D-F,J-M DIRECT SPARK IGNITION CONTROLS
9 69-1299
CHECKOUT AFTER SERVICE
Perform the following steps before leaving the site
(described in the Startup section).
• Start System
• Check Trial for Ignition
• Resetting S8700 After Safety Lockout
Also perform any other checks recommended by the
heating appliance manufacturer if system components
other than the S8700 were serviced.
Fig. 8. Burner flame conditions.
TROUBLESHOOTING GUIDE
Start the system by setting the thermostat or
temperature control to call for heat. Observe the system
response and establish the type of malfunction or
deviation from normal operation by using the
Troubleshooting Guide, see Fig. 9. After any
maintenance or repair, the troubleshooting sequence
should be repeated until normal system operation is
obtained.
NOTE: When the appliance is in the lightoff mode,
ignition spark and the gas control are
energized only during the trial for ignition,
which can last from four to 21 seconds,
depending on the S8700 model. It will be
necessary to recycle the call for heat to the
control while performing this troubleshooting
procedure.
CHECK BURNER FLAME CONDITION
NOISY LIFTING FLAME
BURNER
WAVING FLAME
SMALL BLUE FLAME
LAZY YELLOW FLAME
GOOD RECTIFYING FLAME
1 IN. (25.4 MM)
1/4 TO 1/2 IN. (6.4 TO 12.7 MM)
M18055
CHECK FOR:
• HIGH GAS PRESSURE
• EXCESS PRIMARY AIR
OR DRAFT
CHECK FOR:
• POOR DRAFT
• EXCESS DRAFT
• HIGH VELOCITY OR
SECONDARY AIR
INSTALL SHIELD IF NECESSARY.
CHECK FOR:
• CLOGGED PORTS OR
ORIFICE FILTER
• WRONG SIZE ORIFICE
CHECK FOR
LACK OF AIR FROM:
• DIRTY PRIMARY
AIR OPENING
• LARGE PORTS
OR ORIFICES
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