Changing The Readout Between Fahrenheit And Celsius; Stack Guard Sensor Operation - Watts AERCO Edge CFR 3000 Operator's And Service Manual

SECTION 4 INITIAL START-UP
1. Power the unit ON and remove the front panel to expose the Over-Temperature Limit switches.
2. Press the Manual Reset Limit Switch's RST (Reset) button.
3. You can now restart the unit.
Figure 4-8: Manual Reset Over-Temperature Limit Switch

4.5.3 Changing the Readout Between Fahrenheit and Celsius

Perform the following steps to change the temperature reading between Fahrenheit or Celsius.
1. Press and hold both the Increase and Decrease arrows at the same time for about 4 seconds. The
display shows the temperature in Celsius and °F changes to °C.
2. To change the display back to Fahrenheit, repeat step 1.

4.6 Stack Guard Sensor Operation

The CFR's Stack Guard sensor is field-installed in the factory-provided vent starter section. The Edge
controller ensures the Stack Guard temperature stays above the Stack Guard Low Limit to prevent
condensation. When the Stack Guard temperature is below the Stack Guard Low Limit plus a user-
defined delta, the boiler firing rate is increased incrementally. If the Stack Guard temperature remains
below the Stack Guard Low Limit within a user-defined Exhaust Fault Time, the unit goes to "Low Stack
Temp Shutdown" and will restart after the outlet water temperature drops to 10°F below the
application setpoint.
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Figure 4-9: Changing the Display to Celsius
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