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54
Water Side Cleaning (de-scaling kit is required for this process, please consult factory)
1. Shut down the ABH and clean by using the following steps for
heaters:
-Turn off the power, close the gas valve, and shut down the unit. Wait for the unit to be
cool to the touch.
-For water heaters, close both inlet and outlet water valves
to isolate the appliance.
-Open the drain valve to let out all the water from the appliance, and circulate
Fernox DS 40 Cleaner*
in reverse of normal flow, to flush out any build up that may have occurred in the coils.
-Flush with water to eliminate any of Fernox DS 40 Cleaner that may have been left behind.
-Close the drain valve and open the inlet and outlet water valves to put the appliance back online.
2. Shut down the ABH and clean by using the following steps for
boilers:
-Turn off the power, close the gas valve, and shut down the unit. Wait for the unit to be cool to the touch
-At the chemical injection point first add the appropriate number of bottles of
Fernox DS 40 Cleaner*
to the system, based
on total system water volume. Follow the cleaning instructions on the bottle.
-Open the drain valve to let out all the water from the appliance, and circulate Fernox DS 40 Cleaner in reverse of normal flow,
to flush out any build up that may have occurred in the coils.
-Flush the system of all the Fernox DS 40.
-After the system has been flushed, add the Fernox F1 Inhibitor Protector (for closed-loop boiler applications only) to the
system at the chemical injection point and leave in the system. One bottle of Fernox F1 treats approximately 26 gallons of
water. Please follow instructions on the bottle for specific mixing ratios.
Detailed instructions on Water Side Cleaning can be found in LIT91195 Water Side Cleaning Procedure, available on our
website.
**NOTE: When firing up the boiler for the first few times you may experience some fluttering of the gas burner that may result in
a flame lockout. This is normal and will require you to re-cycle the unit until this clears up. This is caused by water still present
in the combustion chamber.
After all cleaning has been done, it is recommended that a combustion analysis and testing, as shown on page 50, be completed. See
the Start-Up Checklist and Cascade Start-Up Procedures for details.
Maintenance - continued
*Note: Fernox DS 40 is a heat activated de-scaling solution. It must be heated to 160º–180ºF to clean efficiently. Follow Fernox
instructions to ensure a fully clean heat exchanger.
