Fossil Fuel; Low Balance Point - Robertshaw Smart Sense SMART 1000 Installation Manual

TESTING

FOSSIL FUEL

When the SMART 1000 is configured for fossil fuel operation, testing is the same
as a heating and cooling system with the exception that a 3 minute time delay is
activated before the 'Y1' compressor relay will energize on a call for heating or
cooling. The fan 'G' relay is always energized with a call for compressor, auxiliary
or emergency heat. Depending on the mode of operation and equipment
configuration, Heat or Cool will flash when the 'Y1' compressor relay is
energized. Heat 2 or Cool 2 will flash when the 'Y2' compressor relay is
energized. Heat 3 will flash when the auxiliary 'W1' relay is energized. E.Heat will
flash when the mode is set to emergency heat. Whenever the thermostat calls for
auxiliary heat, the heat pump compressor or compressors will be de-energized
and the auxiliary heat will remain on until the call is satisfied.
LOW BALANCE POINT (Heat Pump or Fossil Fuel)
When an outdoor sensor is used with the SMART 1000 Installer Option 16 allows
you to select a low balance point temperature. When the outdoor temperature falls
below the low balance point setting, a call for heat from the thermostat
automatically energizes the 'W1' relay and bypasses the 'Y1' compressor relay.
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