Hamilton Engineering EVO 299 User manual

Page 1 of 3
34000 Autry Street, Livonia, MI 48150 • 800.968.5530 • Fax [phone] • www.hamiltonengineering.com • LIT91195 REV 11/2020
EVO 299.2/.3–599.2/.3
300,000 BTU/hr
399,000 BTU/hr
630,000 BTU/hr
WATER SIDE HEAT EXCHANGER
CLEANING PROCEDURE
EVO 299–599
WARNING
These appliances MUST be installed by a properly licensed individual in
the City and State which the unit is being installed. All start up adjustments
and subsequent service work must be done by a similarly licensed
contractor or a factory trained service individual. Failure to comply could
result in loss of warranty and or severe personal injury, death and or
substantial property damage.

34000 Autry Street, Livonia, MI 48150 • 800.968.5530 • Fax [phone] • www.hamiltonengineering.com • LIT91195 REV 11/2020
INTRODUCTION
All high eciency condensing
appliances will require more
maintenance (cleaning) than their
non-condensing counterparts. Failure
to properly maintain these units may
result in damage to the appliance that is
not covered under warranty. Failure to
follow all of the instructions contained in
this manual may also cause premature
product failure that may not be covered
under warranty.
Normal descaling can be accomplished
in two hours per unit, and (except under
the most severe conditions) should not
require more than four hours. DS40
FERNOX is the descaling solution
recommended by our stainless steel
manufacturer.
WHEN TO CLEAN
In some extreme applications (hard
water and/or higher than normal
operating temperatures) the heat
exchanger may require chemical
cleaning. If you are experiencing H11
lockouts that cannot be attributed to
pump related problems or remedied by
back flushing the heater with city water
pressure, chemical cleaning of the heater
is likely your maintenance solution.
Additionally, if your heating boiler or
water heater is experiencing ‘popping’,
‘banging’, or ‘knocking’ noise and
shaking as a result of the water boiling
as it circulates through the heat
exchanger and it can not be attributed to
the circulating pump, chemical cleaning
of the heat exchanger may be required.
PLEASE NOTE: If any of these noises
are heard, the appliance should not be
operated until the cause is identified
and resolved!
Chemical cleaning of the heat exchanger
should only be done at the direction of
Hamilton Engineering Company, Inc.
Failure to follow the prescribed cleaning
procedure will result in voiding any
warranty of the heat exchanger.
DESCALING SOLUTION
DS40 is a highly eective, heat
activated descaling solution. It must
be heated to 160°–180°F to clean
eciently! Follow instructions listed
below.
Kit (P/N HEX 61102) includes 3.3 lb.
(1.5 kg) container of DS40 and a pack of
neutralizer, which is used to neutralize
the used cleaning solution before
discarding it. 3.3 lb (1.5 kg) will treat up
to 20 gallons of water.
MIX RATIO:
HW299–HW599 (Duo): 1/2 (~1.6 lb.) of
container per 8–10 gallons of hot water.
Add hot water, agitate until dissolved.
For additional information, consult
manual inside box or go to
www.fernox.com
DESCALING PROCEDURE
(using DS40 cleaning kit)
1. Shut o gas at appliance
2. Shut o water to and from
appliance (isolate via ball valves);
drain water
NOTE: In some cases, you may want
positive isolation of the cleaning
solution from the rest of the system.
Breaking the unions on the water lines,
removing the nipples and fittings from
the manifolds, and then capping the
manifold openings will accomplish
isolation. This would be done between
steps 2 & 3.
3. Attach a hose to the drain on the
ball valve below the pump if so
equipped. If your heater does not
have a drain, remover the pump
and attach a water spigot to a
flange and install where the
pump was.
4. Attach female end of hose to the
adapter; the termination end of
the hose will go into the acid
solution bucket.
5. Attach the female end of the other
hose to the drain valve connection
on the outlet side of boiler, then
attach the opposite end to the
chemical pump.
6. Pour water into plastic, chemical
and heat resistant 5–10 gallon
container (depending on size of
appliance). Add cleaning solution.
See ‘Descaling Solution’ above for
required amounts. Prime the pump.
7. Turn on pump and circulate
solution (this is the reverse of
normal flow).
8. On models HW 299.2, HW 399.2 &
HW 599.2 you will need to change
parameters S14 and S15 from 1 to 0.
This will allow you to fire the heater
in service mode without tripping
faults. See the next line for .3
models.
Page 2 of 3

On models HW 299.3, HW 399.3 and
HW 599.3 it will be necessary to bypass
the flow switch. Remove the two black
wires that are next to each other on
connecter, use a wire nut to connect the
two black wires to each other. See area
circled in photo below.
9. The DS40 needs to be heated
to between 160°F and 180°F. To
heat the solution put the heater
in service mode and fire the
heater at low fire. Monitor the
temperature via the display and
once the solution is up to temp
take the heater out of service and
continue to pump the solution, if
the temperature drops below 160°F
fire the heater again.
Put the heater into service mode
by pressing the down arrow to get
into setup, then press the check
mark to select.
Press the down arrow to get to
service, then the check mark to select.
Press the down arrow to get to
burner, then press the check mark
to select.
Press the check mark to select start.
Press down arrow to go to service.
Then the check mark to select.
Burner will come up press the
check mark.
Press the down arrow to speed, the
press the check mark you should
then be able to change speeds
using the up and down arrows.
After circulation is established:
A. If, within 15–30 minutes of
starting, the clean solution
turns GREEN (an indication it’s
cleaning power is exhausted),
additional DS40 System
Cleaner needs to be added.
Hamilton Engineering Company, Inc.
recommends that chemical cleaning
should be done for no longer than 4
hours, changing direction of the flow
in the middle of operation. Timing will
depend on the condition of the system
and circulation rate.
10. Turn the power switch to OFF.
11. Flush heater with clear water.
Circulate clear water through pump
and lines. Add acid neutralizer to
the used solution. The color will
change from red to yellow/green
(solution is ready for discard). Rinse
plastic container.
12. Reconnect flow switch on models
HW 299.3, HW 399.3 & HW 599.3.
On models HW 299.2, HW 399.2 &
HW 599.2 change parameters S14 and
S15 from back to 1 from 0.
13. Return heater to service.
BE SURE APPLIANCE IS FILLED
WITH WATER BEFORE TURNING
POWER ON!
Follow Start-Up Procedures covered
in Part 6 of D118980, Installing,
Operating & Maintaining EVO
299.2/.3–599.2/.3 High Eciency
Water Heaters and Heating Boilers
Manual.
NOTE: In the case of a completely
plugged heat exchanger, chemical
cleaning is almost impossible because
of absence of flow. Appliance must be
returned to Hamilton Engineering for
exchanger replacement. Water quality
issues are not covered by warranty.
34000 Autry Street, Livonia, MI 48150 • 800.968.5530 • Fax [phone] • www.hamiltonengineering.com • LIT91195 REV 11/2020
Page 3 of 3