Service Advisory and Procedure on Heatmaker Models H & HW Units

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If your AMTI Trianco Heatmaker Model H or HW unit exhibits boiling, kettling or moaning noises upon a rise in the boiler temperature, it is time to siphon clean the combustion coil boiler tubes.

You will need two quarts of coil cleaning solution (use either CLR or white vinegar) and 3 feet of 3/16″ plastic tubing to complete the process.

1. Turn off the valves at the boiler and water sources.
2. Note: If your model is a Heatmaker Mark II (M2), make sure that the high vent cap is tight so that no air escapes.
3. Drain only enough water from the system drain to drop the boiler pressure to zero. When the pressure is at zero, close the drain.
4. Remove the petcock valve assembly from the end of the coil bleed tube.
5. Note: For HW-M2 units after sn 294-1107, obtain bleed tube assembly part #2400-028.
6. Place the 3/16” hose or tubing on the petcock line and secure with a clamp or tie-wrap.
7. Place the other end of the hose or tubing into a container of the diluted cleaning solution. Place the container above level of boiler coil.
8. Open the fill valve slightly to fill siphon tube, and then close it again.
9. Slowly open the boiler drain to pull approximately one quart of solution out of the container into boiler coil.
10. Close the boiler drain when the coil is full of solution.
11. Let the boiler drain sit for 15-20 minutes to allow cleaning solution to dislodge contaminants. When the cleansing time has elapsed, add system water to the unit to flush the cleaner back out through the tube. When the liquid running through the tube is clear the cleaning solution is out of the boiler coil.
12. Remove the tube from the bleed tube and replace the petcock assembly
13. Note: On M-2 series, open float vent cap.
14. Turn on the water source and open all isolation valves and purge zones, as required.
15. As a preventative measure, you may choose to add an anti-foamant to the system via the siphon method.
16. Return your Heatmaker boiler to service.

If you have any questions, call our technicians Monday-Friday, 5:00 a.m. – 7:00 p.m.,   EST; and Saturday 5:00 a.m. – 1:00 p.m., EST.

Heatmaker.com

781/961-1660

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