Smith Cast Iron Boilers GT Series manual Ignition Sequence, not activated when, burner light is on

Page 38GT INSTALLATION AND OPERATION INSTRUCTIONS

Problem	Detected Problem	Solution
Ignition Sequence	Stack Safety Limit Trips (Automatic Reset)	This device protects the integrity of the
not activated when	Located on the front of the flue box.	plastic venting material.
burner light is on		If the temperature of the flue gases
(Fan is on and		exceeds 225°F, 107°C, the limit will cut
Fenwal not flashing)		power to the control. Blocked internal
continued		tubes can increase the stack temperature
		to an unacceptable level. Flush out the
		boiler.
Two Flashes on	The Fenwal controller thinks that there is a	If the combustion sequence is normal,
Fenwal	flame prior to ignition.	and there is no flame prior to ignition, the
		Fenwal control is defective, and must be
		replaced.
Three Flashes on	Indicates Ignition Lockout.	If the condensate drain gets blocked,
Fenwal		the boiler will become flooded, and
		terminate operation, as the flame rod
		becomes immersed. This will damage
		the flame probe. To correct, free the drain
		blockage, and permanently prevent it from
		reoccurring. Remove and dry off the probe.
		Reinstall the probe and try for ignition, if
		it fails to ignite, leave the fan run for up to
		three hours to dry out the insulation and
		probe.
		Reset Boiler so it will attempt to ignite.
		Check for proper operation of ignition
		components. Make sure igniter glows and
		gas valve opens.
		Check for proper line pressure at gas
		valve when it opens.
		If boiler lights check for flame signal
		between FC1 And FC2 on Fenwal control.
		If lower then 1.2 micro amps see Boiler
		will not stay lit below.
		Check combustion properties.
Boiler will not stay	Indicates lack of a good flame signal. In	If the Burner light on the Sentry is going
lit.	order to stay running the flame signal must	out, go to “Burner shutting off”.
	be at least 0.7 micro Amps.	Check condensate drain for blockage and
		check the inlet piping for ingested snow
		or water (if the flame rod gets wet, it may
		need to be replaced). Check for resistance
		from flame rod to ground, must be an
		open circuit (O.L).
		Check for proper polarity of line and
		neutral wiring to the boiler.
Boiler bangs or	Bangs or sounds like a kettle while burner	Ensure the plumbing is as shown in
hisses	is running indicating insufficient flow.	manual. Check to see if pumps are faulty
		or end switches are stuck. This problem
		can lead to boiler overheating!