10.Carefully slide out the burner tray assembly.
11.Reverse above procedure to reinstall.
Gas Valve Removal
1.Shut off main electrical power switch to heater.
2.Shut off gas supply to the heater.
3.Remove front door.
4.Disconnect gas line from gas valve.
5.Disconnect wires, pilot tubing and bleed line, if required.
6.Remove (2) screws that secure gas valve to jack- et.
7.Turn vertical gas pipe from manifold slightly and unscrew gas valve.
8.Reverse above procedure to
Main Burner And Orifice Removal
1.Remove burner drawer. See burner drawer removal procedure.
2.Remove (8) screws from the hold down brackets.
3.Remove (8) screws from the left and right sides of the Manifold assembly. Detach the manifold assembly from the burner tray assembly.
4.Use a long 3/8” socket wrench to remove orifices from the atmospheric gas manifold, 9/16” for Low NOx.
5.Remove burners by raising the bracket on the back end of the burners up and out of their slots.
6.Reverse above procedure to
Fig. 32: IID Pilot
Pilot Removal
1.Disconnect pilot tubing from gas valve.
2.Remove (4) screws from control box. Open the control box.
3.Remove the pilot wire from the ignition wire.
4.Remove (2) screws that mount the pilot bracket to the air manifold assembly.
5.Pull the pilot bracket downward and outward.
6.Reverse above procedure to
Combustion Fan Removal
1.Remove burner drawer. See burner drawer removal procedure.
2.Remove (4) screws the mount the combustion blower to the manifold assembly.
3.Reverse above procedure to
Normal Inspection Procedures
First and third month after initial start up and then on an annual basis. If problems are found, refer to Trouble Shooting Guide for additional directions.
1.Remove top of heater and inspect heat exchanger for soot and examine venting system.
2.Remove rear header and inspect for scale deposits.
*3. Inspect pilot and main burner flame and firing rate.
*4. Inspect and operate all controls and gas valve.
*5. Visually inspect system for water leaks.
*6. a. Oil pump motor and bearing assembly, if oil cups are provided.
b.Disconnect pump from header and check con- dition of pump impeller. Check condition of bearing by attempting to move impeller from side to side. Replace any parts showing wear.
c.Check pump coupler for wear and vibration.
7.Check flow switch paddle (if provided).
8.Clean room air intake openings to assure ade- quate flow of combustion and ventilation air.
CAUTION: Combustion air must not be contami- nated by corrosive chemical fumes which can damage the heater and void the warranty.
9.Keep heater area clear and free from combustible materials, gasoline, and other flammable vapors and liquids.
*Should be checked monthly. (Takes approximately 15 minutes).
Repair Section
Tube Cleaning Procedure (Typical)
Establish a regular inspection schedule, the frequency depending on the local water condition and severity of service. Do not let the tubes clog up solidly. Clean out deposits over 1/16" in thickness.
28
