Checking For Gas Leaks; Flue And Air Inlet Piping Inspection; System Piping, Pressure, And Expansion Tank Inspection; Ignition And Flame Sensor Inspection - Watts Aerco TAG-0072 GF-146-E Operation & Maintenance Manual

AM Series Boilers and Water Heaters User Manual
CHAPTER 10 – MAINTENANCE

10.1 Checking for Gas Leaks

• Inspect all gas piping and verify to be leak free.
• Check for gas leaks: using soap solution, check for gas leaks from meter to appliance
including all pipes and fittings and heater connection. Use liquid soap solution for all gas
testing.

10.2 Flue and Air inlet Piping Inspection

• Check for obstructions, condensation, corrosion and physical damage, water stains, any signs
of rust, other corrosions or separation of the vent and air intake piping.
• Check outside terminations. Screens and louvers should be free of any debris and must be
cleaned as required.

10.3 System Piping, Pressure, and Expansion Tank Inspection

• Check water piping and accessories for leaks. All leaks should be corrected.
• Check that the system is filled with water and the reading on the pressure gauge remains
stable.
Eliminate all system and unit leaks. Continual fresh makeup water will reduce boiler life.
Minerals can build up in sections, reducing heat transfer, overheating heat exchanger, and
causing heat exchanger failure. Leaking water may also cause severe property damage.

10.4 Ignition and Flame Sensor Inspection

To inspect and maintain the ignition and flame sensor, perform the following:
Ignition and Flame Sensor Inspection
1. Remove the fan-burner assembly unit per Section 10.15.
Remove any deposits accumulated on the ignition/flame sensor electrode using sand paper.
2.
3. Check the positioning of the electrodes per Section 10.19.
4. Reinstall the fan-burner assembly back into the unit.

10.5 Wiring and Connections Inspection

Inspect all heater wiring, making sure wires are in good condition and securely attached.

10.6 Performance Verification Inspection

• Start the unit and perform a combustion calibration test as per Section 8.7.
• Verify cold fill pressure is correct and that operating pressure does not go too high (if so, check
for problems with the expansion tank).

10.7 Flame Inspection

• Inspect flame through the observation window on the burner.
• If the flame is unsatisfactory at either high fire or low fire, clean the burner per Section 10.15.
OMM-0100_E • GF-146 • 11/15/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 125 of 170