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PART 8. MAINTENANCE
D. COMBUSTION CHAMBER COIL CLEANING INSTRUCTIONS*
*Before beginning this procedure, you must have the following items on hand:
• Nylon brush—
DO NOT use brass, stainless or steel brushes.
• Water
• Vacuum cleaner
• Fernox F3 Cleaner
• Fernox F1 Inhibitor Protector (boilers only)
• Fernox DS 40
• Towel for clean up and plastic sheeting to protect electronics.
NOTE: If electronics do get wet, DO NOT turn on power to appliance until
they have been thoroughly dried, as component failure may result.
1) Shut down the EVO by using the
following steps:
a. Turn off the power, close the gas
valve, and shut down the unit.
Wait for the unit to be cool to
the touch.
b. Remove the clean-out cap and
place drain bucket according to
the directions above.
c. Remove the Molex plugs from
the fan.
d. Remove the (6) 6mm nuts from
the burner plate assembly to
access the coils.
e. Pull the entire burner plate
assembly towards you and
remove rear target wall.
2) Vacuum first and then use the
nylon brush to scrub coils to
remove any buildup. Vacuum the
debris from the coils.
3) Using a spray bottle filled with
water or a hose under low
pressure to avoid water spraying
on electronics (be sure to cover
them to protect against water
damage), spray the coils liberally,
making sure the water penetrates
and funnels down through
the condensate hose. If the
condensate hose is blocked, try
to knock any debris loose with a
small screwdriver. Replace hose if
not completely clean.
4)
If surface or coil gap fouling
still exists after the above
measures have been taken,
the heat exchanger requires
additional cleaning.
Use a
non-
acid
based cleaning solution,
such as Fernox F3, to thoroughly
soak the remaining residue. Brush
clean and then completely rinse
all residue and cleaning solution
down the condensate drain
assembly. It may take several
applications of the F3, followed by
a rinsing, to completely clean the
coil surfaces. Use a spray bottle
for
each
(F3 and clear water).
Repeat if necessary.
5) Be sure that water is flowing
freely through the bottom casing
of the heat exchanger and the
drain is not plugged. At this point,
the EVO should be ready to power
back up.
6) Before powering up the EVO
follow the steps below:
a. Re-install the burner assembly
and rear target wall (fiberboard
insulation)
b. Replace the (6) 6mm nuts to
the burner plate, following
appropriate tightening pattern
and torque.
c. Re-connect the Molex plugs.
d. Re-set system thermostats.
e. Replace the clean-out cap.
f. Turn the EVO back on** and
monitor the condensate drain
until flow has been established.
g. Re-connect the condensate
hose to the outside connection.
FIRE SIDE CLEANING
