Leviton omnistat 3 Directives D'installation page 10

Single Stage Conventional - Continued
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).
7. Test the "Heat" mode by performing the following steps:
a. Tap the "-" or "+" button one time – this will bring up the raise/lower setpoint, as
well as a "flame" or "snowflake" icon below the setpoint.
b. Tap the Fan button as necessary, to change the icon below the setpoint to "
flame" (Heat mode).
c. Use the "+" button to raise the desired heat setpoint above the current
temperature (recommend 2 degree raise). Ensure that the heating unit comes on.
d. Use the "-" button to lower the heat setpoint back below the current temperature.
Ensure that the heating unit goes off.
8. Test the "Cool" mode by performing the following steps:
a. Tap the "-" or "+" button one time – this will bring up the raise/lower setpoint, as
well as a " flame" or "snowflake" icon below the setpoint.
b. Tap the Fan button as necessary, to change the icon below the setpoint to
"snowflake"
(Cool mode).
c. Use the "-" button to lower the desired cool setpoint below the current
temperature (recommend 2 degree decrease). Ensure that the cooling unit comes
on.
d. Use the "+" button to raise the cool setpoint back above the current temperature.
Ensure that the cooling unit goes off.
****IMPORTANT****
The RC500-2EW thermostat is designed to work with most single stage conventional 4-wire HVAC
systems (without a transformer common). However, if the RC500-2EW "resets" when calling for heat
or cool, or if the heat, cool, or fan relay cannot supply enough current to power thermostat without
the relay activating, the transformer common wire or the Leviton Thermostat Power Supply Module
(Part Number: 30A00-2) is required.
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