HTP Mod Con 300 HL, Installation & Maintenance Manual

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2. Using a spray bottle filled with lime remover, spray liberally on the coils, making sure the solution
penetrates and funnels down through the condensate system. If the condensate system is blocked, let
chemical penetrate for at least 15 minutes, or until condensate drains.
3. Use the nylon, stainless steel or brass brush (do not use steel) and scrub coils to remove any buildup.
Then vacuum the debris from the coils.
4. Spray the coils with clear water, making sure to confine the spray to the area being cleaned (Try to
avoid getting the back ceramic wall of the unit wet). Flush the combustion chamber with fresh water until it
runs clear from the condensate. At this point, the boiler should be ready to be re-assembled.
a. Inspect gaskets.
b. Re-install the burner assembly.
c. Replace and tighten the (6) 10 mm nuts to the burner plate using staggered tightening
sequence (see detail).
d. Re-connect all wiring connections.
e. Inspect the gas valve to assure the O-ring is in place.
f. Replace the (4) screws on the aluminum connector on the gas valve. Turn the gas back on.
(IMPORTANT: CHECK FOR GAS LEAKS BEFORE TURNING THE APPLIANCE ON!)
g. Turn the boiler power back on and create a demand on the boiler. When boiler is lit, observe
condensate flow from the boiler. Be sure the boiler is operating properly.
h. Re-connect the condensate piping to the outside condensate connection.