34000 Autry Street, Livonia, MI 48150 | 800.968.5530 | Fax 734.419.0209 | www.hamiltonengineering.com | LIT91127US REV 5/2018
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GENERAL INFORMATION
PART 1. GENERAL INFORMATION
A. HOW IT OPERATES
The EVO product line is an extremely high efficiency water heating product, requiring special venting and
condensate removal precautions. All high efficiency condensing appliances will require more maintenance
(cleaning) than their non-condensing counterparts. Failure to do so 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.
This appliance has built-in freeze protection, automatically activating the circulation pump when the internal
water temperature drops below 41°F. If the internal water temperature drops to 37°F, a burn cycle will be initiated
and will shut down as soon as the supply water temperature has reached 50°F.
Power and gas must be left on
for this function to operate.
The appliance’s primary controller (FMT 914) operates all functions of needed control and safety. It contains
sophisticated logic that allows it to operate at very precise temperatures while minimizing burner on/off cycling.
When multiple units are operated as a Cascade to handle a common load, the control logic contains the ability
to control all of the units as efficiently as one.
Cascade operation is a factory-installed and programmed option,
requiring a field wiring connection between appliances for operation.
Looking at the controls on the front of the appliance,
1) POWER on/off switch
2) SETPOINT knob, temperature control (and fan speed control knob during service mode)
3) TEMPERATURE setpoint display
a. Temperature in °F, corresponding to the SETPOINT knob
b. Display will always read temperature setpoint unless there is a fault code displayed.
c. Cascade indicator light, found in the lower right hand corner of the Temperature display. This dot will
be flashing when this appliance is part of a properly-connected, commonly-controlled group of EVO
products and reading temperature sensors.
d. Display code, not flashing indicates a Soft Lockout
e. When this display is flashing a code, the appliance is in a Hard Lockout and the reset must be
pushed to re-start the appliance.
4) Green indicating light labeled BURNER ON; when lit, the burner is firing.
5) RESET button, used as described in 3e above, as well as to view sensors and set altitude
(see pages 46 & 64 respectively for details).
6) SERVICE port, used for connecting a computer to the appliance to download the service fault history, as
well as factory setting of control board parameters. There is a service button located just below the
service port that must be pressed with a pointed object to get to the service mode.