A.O. Smith BTN 120 THRU 400/A Series Operational Checklist, Remedy, Complaint, Cause, User

OPERATIONAL CHECKLIST

This checklist in conjunction with “TROUBLESHOOTING” and the “SEQUENCE OF OPERATION” should be used as an on-the-job troubleshooting guide to identify the cause of incorrect system operation and suggest a remedy for its correction. Because improper piping and wiring can result in unsatisfactory system performance, it is suggested that the installation by examined before using the checklist. Be sure to refer to the correct piping and wiring diagram for the type of system that is installed.

The system should be filled with water, purged of air, valves properly set and utilities connected and ready to operate.

		REMEDY
COMPLAINT	CAUSE	USER	SERVICEMAN
*Water not hot enough.	Thermostat set too low.	Set thermostat dial to a higher
		temperature.
	Thermostat out of calibration.	Call serviceman	Recalibrate thermostat. If thermostat cannot
			be recalibrated, replace.
*Insufficient hot water	Thermostat set too low.	Set thermostat dial to a higher
*See WATER TEMPERATURE		temperature.
CONTROL WARNING (on
Page 5).	Thermostat out of calibration.	Call serviceman.	Recalibrate thermostat. If thermostat cannot
			be recalibrated, replace.
	Main manual gas shutoff	Open main manual gas shutoff
	valve partially closed.	valve to fullest extent.
	Heater too small for demand.	Space usage to give heater time
		to restore water temperature.
	Thermostat differential is	Call serviceman.	Replace dual bulb controller if differential is
	too wide.		greater than 4°F.
	Heater recovery is slower.	Call serviceman.	Check gas input. If incorrect, adjust gas
			pressure or replace main burner orifice.
	Drafthood not installed or	Call serviceman.	Install drafthood or baffles as furnished
	one or more flue baffles.		with unit.
Water temperature too hot.	Thermostat set too high.	Set thermostat to a lower setting.
Heater makes sounds: sizzling.	Condensation on outside
	of tank, normal.
Rumbling.	Sediment accumulation on	Drain a quantity of water through	Delime heater.
	bottom of tank.	drain valve. If rumbling persists,
		call a serviceman.
Ticking or metallic sounds.	Expansion and contraction-
	normal.
Pounding.	Air chambers in piping have	Drain piping system and refill.
	become waterlogged.	Heater must be off while this is
		being done.
Combustion noises.	Too much primary air.	Adjust shutters.
	Overfired heater; Incorrect	Call serviceman.	Check and correct as necessary.
	burners or orifice for type
	of gas used.
Water leaks.	Drain valve not closed	If drain valve cannot be closed
	tightly.	tightly, replace.
	If leakage source cannot	Shut off gas supply to heater	Repair or in case of suspected tank leakage,
	be corrected or identified,	and close cold water inlet valve	be certain to confirm before replacing heater.
	call serviceman.	to heater.
Gas odors.	Heater is overfired.	Shut off gas supply to heater	Check for sooted flue passage.
		and call a serviceman.
			Check for obstructed vent line.
			Check backdraft or lack of draft.
	Possible gas leaks.	Shut off gas supply to heater
		and call gas company at once.

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