20
Terminal Settings
Changes to relay and output terminal actions are made in the Installer Menu.
NOTE:
When the SMART 3000 calls for heating or cooling, the SMART 3000 will
drive both the relays and the 0 to 10V outputs simultaneously. This way
the SMART 3000 can call a circulating water pump via the relays as it
controls room temperature with the valves if needed.
0 to 10V Outputs
To permit the control of modulating heating and cooling valves as well as
variable speed DC fan motors or variable capacity HVAC systems the SMART
3000 has been fitted with three 0 to 10V outputs.
The 0 to 10V outputs in the SMART 3000 are PI (Proportional Integral) controlled.
This control method provides the most accurate and cost effective way to control
heating and cooling valves by ensuring set temperatures are reached as quickly
and efficiently as possible while reducing temperature overshoot.
As the SMART 3000 is fitted with both relays as well as 0 to 10V output to control
HVAC systems, there may be some slight disparity between the thermostat
display and the 0 to 10V outputs actions. The SMART 3000 displays the relay
actions, not the actions of the 0 to 10V outputs on the LCD. In most cases these
are very closely matched. However, as the 0 to 10V outputs have the capability
of providing finer control than the ON/OFF relays heating and cooling may have
started slightly before indicated on the display. This is true of the fan also.
Summary of Contents for SmartSense SMART 3000
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