Adjusting The Automatic Reset Limit Switch Temperature; Resetting The Manual Reset Limit Switch - Watts AERCO Edge CFR 3000 Operator's And Service Manual

SECTION 4 INITIAL START-UP
• Automatic Reset: If the unit's operating temperature exceeds the limit set on the switch, the unit
goes into an alarm mode and shuts the unit down. When the temperature falls 10 degrees below
the limit, the unit automatically resumes operation without operator intervention. The limit range
is manually adjustable from 32°F to 200°F (0°C to 93°C). The default value is 190°F (88°C).
• Manual Reset: If the unit's operating temperature exceeds the limit set on the switch, the switch
goes into an alarm mode and shuts the unit down. The unit cannot be restarted until the switch is
reset manually. The limit is preset to 210°F (98.9°C) and should not be changed.
Note the following points:
• Both switches display the temperature to which the switch is set (the temperature limit), not the
actual temperature it is reading.
• Both switches can display temperatures in Fahrenheit or Celsius.
• The Auto-Reset switch is preset to 190ºF (88°C) but can be adjusted as needed to suite local
conditions, as described below.

4.5.1 Adjusting the Automatic Reset Limit Switch Temperature

Perform the following steps to adjust the Automatic Reset Limit Switch temperature setting.
1. Power the unit ON and remove the front panel to expose the Over-Temperature Limit switches.
2. Press the Automatic Reset Limit Switch's SET button: SP appears in the display.
3. Press the SET button again. The current setting stored in memory is displayed.
4. Press the ▲ or ▼ arrow buttons to change the display to the desired temperature setting.
5. When the desired temperature is displayed, press the SET button.
6. Press both the SET and ▼ arrow buttons together at the same time. This step stores the setting
in memory; note that OUT1 appears in the upper-left corner of the display as confirmation.
Figure 4-7: Auto-Reset Over-Temperature Limit Switch

4.5.2 Resetting the Manual Reset Limit Switch

Perform the following steps to rest the Manual Reset Limit Switch after it has gone into Alarm mode,
and after the temperature has fallen at least 10 degrees below the limit.
•
Figure 4-6: Over-Temperature Limit Switches
• •