A.O. Smith 120 trough 500 manual Proper Sequence of Operation

BTR TANK TYPE HEATERS

SERVICE WORKBOOK

	Is the system properly sized?		yes	no
	Is the system properly installed?		yes	no
	Are there any water leaks?		yes	no
	Does the installation have a recirculating system?		yes	no
	If so, is it operational?		yes	no
VI.	PROPER SEQUENCE OF OPERATION
	During standby does damper close on standby?		yes	no
	During standby is pilot flame off?		yes	no
	On a call for heat does thermostat close?		yes	no
	On a call for heat does damper open completely?		yes	no
	Does sparking begin at pilot?		yes	no
	Is pilot flame established?		yes	no
	If so, does sparking stop?		yes	no
	Does main burner ignite?		yes	no
	Does the thermostat satisfy?		yes	no
	Does damper close?		yes	no
	Comments:
VII.	SAFETY
	A. Gas
	Does pilot flame prove before main burner ignites?		yes	no
	Does damper blade fully open before ignition sequence occurs?		yes	no
	Is burner cover plate in place?		yes	no
	Is burner floor shield in place?		yes	no
	Does IID lockout occur after 30 sec. trial for ignition? (Propane models only)		yes	no
	B. Water Temperature
	Is the thermostat adjusted to the lowest acceptable temperature?	yes	no
	Does the installation have a mixing valve?		yes	no
	If so, is it operational?		yes	no
	What is the outlet temperature of the mixing valve?

NOTE: (To minimize the risk of scalding, the manufacturer recommends storing water at 120°F.)

Is a properly rated temperature and pressure relief valve installed?	yes	no
C. Electrical
Is the 120 VAC electrical power supply properly wired?	yes	no
Are all the BTR control covers in place?	yes	no
Is the 120 VAC electrical power supply properly fused?	yes	no
D. Flammables
Are flammable materials located in the area of the water heater?	yes	no
Are flammable vapors located in the area of the water heater?	yes	no
Comments:

(This service checklist may be photo copied to assist with BTR service call.)

A.O. Smith Water Products	53	Service Handbook
Irving, Texas ©		1999 Training Department