34000 Autry Street, Livonia, MI 48150 | 800.968.5530 | Fax 734.419.0209 | www.hamiltonengineering.com | LIT91127US REV 5/2018
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B. EVO CONTROLS CONT.
GENERAL INFORMATION
Further notes to the use of 0–10 VDC as a control:
• Room thermostat jumper must be removed—if it is not, it will fire based on setpoint when there
is less than 1 volt
• Red dial must remain in the maximum position (all the way to the right) If it is not turned all the way
to the right, it’s corresponding setpoint becomes the maximum the 0–10 volt signal will go to,
regardless of the voltage supplied.
• 0 VDC–0.9 VDC results in no call for heat
• 1 VDC results in minimum set point, this should always be programmed to the minimum water
temperature desired when using a BMS system.
• 10 VDC results in maximum set point, this should always be programmed to the maximum
water temperature desired when using a BMS system. Voltage can be sent in any value between
1 and 10 and the temperature set point will be the exact value that corresponds to that voltage.
Below 1 volt, there will be considered no heat demand.
Production of Indirect Domestic Hot Water -
this controller can also provide for control of split loads,
Central Heating and Domestic Hot Water, via an additional pump or diverting valve with priority for DHW,
a user selectable option. It can also control the system pump or signal to a zone controller, if required.
See LIT91110 - FMT-914 Control Configurations for suggested piping diagrams and details.
The EVO control system offers the ability to automatically provide DHW from a stand alone or group of Cascaded
Heating Boilers. To do this properly, a 10k ohm thermistor or aquastat, which senses the DHW tank water temperature,
must be connected to the appropriate terminals on the EVO.
The default control parameters provide priority for DHW production. On a call for heat from the DHW tank,
the EVO will:
• Switch on if there is no current heat demand
• Drop power to the system pumps, if energized through relay and EVO controller
• Energize indirect DHW pump or 3-way valve
• Change boiler water temperature setpoint to preset parameter
When the DHW load is satisfied, the indirect DHW pump will run for an additional minute (the boiler will be off)
as a cool down cycle, then the boiler will resume the state and water temperature it was at prior to the DHW call
for heat.