Patterson-Kelley MOD-04 - Manual (Page 33)

Modu-Fire
®
Gas-Fired Boiler Maintenance
30
• Check the cabinet pressure for a minimum of
0.3" w.c.
• Check burner is clean (refer to Section 5.2).
Ignition Failure
In the event the pilot flame is not detected by the
UV scanner during the 10 second trial-for-ignition
period (Step 9), the pilot gas valve and spark igni-
tion are de-energized. At this time a safety lockout
occurs which de-energizes all outputs from the pro-
grammer except Terminal A, which is connected to
the "Flame Failure" indicator. A manual reset of the
programmer (located inside the control panel) is
required.
Flame Failure
In the event of a main flame failure during a firing
period, the main fuel valves are de-energized and
the programmer immediately goes into "lockout"
mode. If flame failure occurs and the indicator is
illuminated, the programmer must be manually re-
set.
WARNING
If any “Manual Reset” limit device trips,
DO NOT
reset without determining and correcting the cause.
(Flame safeguard, high or low gas pressure,
high temperature limit, stack temperature.)