Leviton omnistat 3 Instrucciones De Instalación página 18

About 2-Pipe Systems - Continued
4. Press [FAN]. The fan icon should display in the lower left-hand corner of the
display and the system fan should come on. NOTE: If "Fan Stages" have been
set to more than 1, a second icon depicting a staircase, with the first step
displayed in black will appear. Press [FAN] again to continue to Stage 2 and
Stage 3 (based on Fan Stages set in HVAC Settings).
5. Press [FAN] again. The thermostat will turn off, as evidenced by a power icon
appearing in the lower left-hand corner, no temperature displayed, and the fan
stopping.
6. Press [FAN] a third time. The thermostat will turn on, restoring the temperature
display and setting the fan to automatic mode (engage when an appropriate
heating or cooling call is made).
****IMPORTANT****
Unlike conventional and heat pump HVAC systems, changing the mode between heat and cool
is not a task that can be achieved readily for testing actual operation of both heat and cool
modes at the time of the thermostat installation. In a 2-Pipe application, take the following
steps to test operation:
• Press either the "-" or "+" to view the setpoint and observe the icon below the
setpoint. It should match the mode the 2-Pipe system is currently in.
• If the system is currently in Heat mode, raise the heat setting above the current
temperature and ensure that the heating unit comes on. Lower the setpoint below
the current temperature and ensure that the heating stops.
• If the system is currently in Cool mode, lower the cool setpoint below the current
temperature and ensure that the cooling unit comes on. Raise the setpoint above
the current temperature and ensure that the cooling unit goes off.
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