Cleaning The Heat Exchanger With Cleaning Solution - Watts AERCO Modulex EXT Commercial Series User Manual

Modulex EXT Commercial Series Boilers User Manual
CHAPTER 8: Maintenance Schedule
Mechanical Cleaning of the Heat Exchanger – Continued
Figure 8-22: Angle of Cleaning Instrument – Heat Exchanger Cut-Away View
3. The most crucial area to clean is the bottom of the heat exchanger, where the heat
exchanger pins are the closest. This can be done by removing one of the exhaust
manifold "blanks" and using a pressure washer with angled nozzle to spray upwards.
Make sure to cover the top of the heat exchanger with a tarp to prevent water from
spraying out of the top of the unit. To clean this area manually, insert your cleaning
instrument at an angle between the pins, as shown in Figure 8-22, below. Be sure to clean
the space between each pin.
4. Repeat the previous step on each burner module in the unit.
5. After mechanical cleaning, rinse each heat exchanger with water until no further debris
comes out.
6. After washing the aluminum components, make sure the condensate siphon is free of
obstructions, cleaning it if necessary.
7. Blow compressed air into the combustion chamber to remove any dirt clogging the
aluminum pins on the combustion chamber walls. Remove any remaining buildup from the
heat exchanger, particularly on the lower heat exchanger pins, with a stiff plastic brush.

8.12.2 Cleaning the Heat Exchanger with Cleaning Solution

If mechanical cleaning has not removed all of the build-up, complete the instructions below to
clean the heat exchangers with a cleaning solution specifically designed for removing
combustion by-products from aluminum heat exchangers. The product approved by AERCO is
AXI-Therm Boiler Combustion Side Cleaner, Part A and Part B. The instructions below
require 4 to 12 oz. (120 mL to 360 mL) EACH of Part A and Part B per 100,000 BTU/hr. of unit
capacity.
OMM-0095_0H
GF-139
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Phone: 800-526-0288
Page 133 of 144
09/15/2017