Deliming Solvents, Tank Cleanout Procedure

Example 2:

If initial inspection after 6 months shows 2” of lime accumulation. Therefore, the heater should be delimed every 3 months.

FIGURE 14

DELIMING SOLVENTS

Hydrochloric base acids are not recommended for use on glass lined tanks.

CAUTION

Observe handling instructions on label of product being used.

TANK CLEANOUT PROCEDURE

The following practices will ensure longer life and enable the unit to operate at its designed efficiency:

1.Once a month the heater should be flushed. Open drain valve and allow two gallons of water to drain from the heater. Inlet water valve should remain open to maintain pressure in tank.

2.A cleanout opening is provided for periodic cleaning of the tank. Gas must be shut off and heater drained before opening cleanout.

To clean heater through cleanout opening, proceed as follows:

1.Drain heater.

2.Remove outer cover plate from lower side of heater jacket.

3.Remove six (6) hex head screws securing tank cleanout plate and remove plate.

4.Remove lime, scale, or sediment using care not to damage the glass lining.

5.Inspect cleanout plate gasket, if new gasket is required, replace with part no. 9004099215.

6.Install cleanout plate. Be sure to draw plate up tight by tightening screws securely.

7.Replace outer jacket cover plate.

In some water areas the sediment might not be removed by this method and may result in the water heater making rumbling or boiling noises.

IGNITION MODULE SYSTEM

Before calling your service agent, the following checklist should be examined to eliminate obvious problems from those requiring replacement or servicing.

—Check that “main manual gas shutoff valve” is fully open and that gas service has not been interrupted.

—Check that after following the appliance OPERATING INSTRUCTIONS, the “Top Knob” of the appliance gas valve is in “ON” position.

—Check electrical supply to the appliance for possible blown (or tripped) fusing or power interruption.

—Is the water temperature in tank below the thermostat dial setting on the appliance thermostat (calling for heat)?

—It is possible that the high limit (E.C.O.) has functioned to shut off the appliance. See FEATURES — Water Temperature Control for reset procedure. Contact your serviceman if limit continues to function to shut off appliance.

SYSTEM DIAGNOSTICS

Your water heater is equipped with an ignition module that incorporates a diagnostic system to assist in troubleshooting the appliance. The indicator codes on the ignition module are as follows:

	1 flash	System lockout (retries or cycles exceeded)

	2 flashes	Pressure switch stuck close

	3 flashes	Pressure switch stuck open

	4 flashes	Open on high temperature limit switch (eco)

	6 flashes	115 volt AC power reversed (check polarity)

	7 flashes	Low flame sense signal (make sure flame
	7 flashes	sensor is in burner flame)
		sensor is in burner flame)
	8 flashes	Check ignitor

continuous flash -> continuous flame sensed > 5 seconds without gas valve

continuous on -> internal control failure - replace ignition control module.

Use this diagnostic system in conjunction with the “OPERATIONAL CHECKLIST” and the “SEQUENCE OF OPERATION” to troubleshoot the appliance.