Led indicators – Robertshaw 9555 User Manual

Page 10

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Changing Fahrenheit (F) to Celsius (C),

Temperature Differential, Deadband,
and Residual Cool

The temperature differential is factory set at 1°F (0.5°C) for the 1

stage

differential and 2°F (1.0°C) for the 2

stage. The deadband for auto

changeover is set at 3°F (1.5°C). To change settings:

1. The thermostat is preset to display the temperature in degrees

Fahrenheit (U.S. models) or degrees Celsius (Canadian models). The
temperature display can be changed. Press and hold both the

and

buttons for three seconds. The display will read F or C. Release the

buttons. Press either the

button to change the display.

2. After three seconds, the display will switch to the differential

settings. The display will read DIFFERENTIAL 1

3. The temperature differential is factory set at 1°F (0.5°C) for the first

stage. Press either the

button to adjust the 1

stage

differential between 0.5°F - 3°F.

4. Either wait three seconds or press the

button. The display will

indicate: DIFFERENTIAL 2

5. The 2nd stage differential is factory set at 2°F (1.5°C). Press either

the

button to adjust the 2nd stage temperature differential

between 1°F - 6°F (1°C - 3°C).

6. Press the

button to adjust the 2nd stage timed differential

between 5 to 40 minutes. Either wait 5 seconds or press the
button.

7. Either wait three seconds or press the

button. The display will

indicate: AUTOCHANGE DEADBAND.

8. Press either the

button to adjust the deadband between

2°F - 8°F (1.0°C - 4.5°C).

9. Either wait three seconds or press the

button. The fan icon and

ON will be displayed.

10. Press either the

button to adjust the residual cool fan delay

between 0, 30, 60, or 90 seconds.

11. The display will return to the original room temperature display after

a few seconds.

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LED Indicators

The Robertshaw 9555 uses three LED indicators (in addition to icons on
the LCD display) to indicate functionality of the thermostat. When illumi-
nated, the right orange LED indicates that the thermostat is calling for
heat. The left green LED indicates a call for cool. When the middle
amber LED is illuminated, the thermostat is calling for second stage
heating or cooling. If this LED is illuminated too frequently during periods
of moderate temperature, check the differential settings (see
Temperature Differential and Deadband section).

110-975D En.qxd 5/13/03 2:43 PM Page 10 (Black plate)