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IOM-T-562 2215
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The heating setpoint can be set from 40 to 95°F (4.5 to 35°C). The Heat On symbol is
shown on the display when the thermostat is heating. Heating for freeze protection is provided
whenever the air or floor temperature falls below 40°F (4.5°C), regardless of operating mode.
Regular Heating
W1 relay is on when the air temperature falls 1.5°F (1°C) below the Heat To setting.
When the temperature reaches the Heat To setting, the relay turns off. The W2 relay
turns on based on settings selected in the Setup menu. W2 turns off when the air
temperature is 0.5°F (0.25°C) below the Heat To setting.
Radiant Floor Heating
When Radiant Floor Heating is selected in the setup menu, the W1 relay operates using
Pulse Width Modulation. This improves comfort for radiant systems with high mass floors.
• 100% on time at Heat To setting -1.5°F
• 50% on time at Heat To setting
• 0% on time at Heat To s 1.5°F
Room Sensor and Averaging
The thermostat can measure room temperature between -46 to 212°F (-43 to 100°C).
The room temperature can be measured using a combination of the built-in and auxiliary
sensors.
• Built-in room sensor only
• Built-in room sensor with auxiliary room sensor(s) (temperature is averaged)
• Auxiliary room sensor only
Floor Sensor for Radiant Floor Heating
If a floor sensor is connected, floor minimum and maximum settings are available. For a
combination of air and floor temperature control, leave the internal air sensor on in the setup
menu. A floor minimum can be used to prevent a fast drop in temperature caused by receding
solar exposure. This operation is recommended for areas heated by afternoon sun through
large windows. When the sun sets, it can take a long time for the floors to get warm again. This
may cause the room to cool off too much in the early evening. A floor minimum setting can help
with this condition by maintaining a floor minimum temperature. Keep in mind the floor minimum
temperature will override the air temperature, and if set too high, may overheat the room.
A floor maximum is recommended for rooms with hardwood floors. Setting floor minimum
and maximum temperatures is a way of enhancing the comfort of the living space while
protecting floor coverings. If there are more than one floor temperature sensors, the
temperature is averaged.
Warm Weather Shut Down (WWSD)
The heating system can automatically shut off based upon the outdoor temperature
and the WWSD setting. This provides a convenient way to shut off radiant floor heating.
The cooling setpoint can be set from 45 to 100°F (7.0 to 38.0°C). The Cool On symbol
is shown on the display when the thermostat is cooling.
• Cooling relay Y1 turns on at Cool To s 1.5°F (1°C)
• Cooling relay Y1 turns off at Cool To setting
Cold Weather Shut Down (CWSD)
The cooling system can automatically shut off based upon the outdoor temperature
and CWSD setting. This prevents unwanted cooling during the winter.
Sequence of Operation
Heating Operation
Cooling Operation
