52
PART 8. MAINTENANCE
1) Shut down the EVO and clean by
using the following
steps for
heaters
:
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. For water heaters, close both
inlet and outlet water valves
to isolate the appliance.
c. 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.
d Flush with water to eliminate
any of Fernox DS 40 Cleaner
that may have been left
behind.
e. Close the drain valve and open
the inlet and outlet water valves
to put the appliance back online.
2) Shut down the EVO and clean by
using the following
steps for
boilers
:
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. 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.
c. 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.
d.
Flush the system of all the
Fernox DS 40.
e. 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 51, be completed. See LIT91111
(Start-Up Checklist) & LIT91133
(Cascade Start-Up Procedures) for
details.
D. COMBUSTION CHAMBER COIL CLEANING INSTRUCTIONS* (continued)
WATER SIDE CLEANING
(de-scaling kit is required for this process, please consult factory)
*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.
