Purge Switch Open During Purge; Ignition Switch Open During Ignition; Safety Pressure Relief Valve Test - Watts AERCO CFR 1500 Operation And Service Manual

SECTION 5 SAFETY DEVICE TESTING

5.10 Purge Switch Open During Purge

The Purge switch (and Ignition switch) is located on the Air/Fuel Valve. To check the switch:
1. Set the Controller's Enable/Disable switch to Disable.
Main Menu → Diagnostics → Manual Mode
2. Go to: and put the unit in Manual Mode.
3. Set the valve position between 25% and 30% using the + (Plus) and – (Minus) controls.
4. Remove Air/Fuel Valve cover by rotating counterclockwise to unlock it (Figure 5-10).
5. Remove one of the two wires (#171 or #172) from the Purge switch (Figure 5-11a – 5-11c).
6. Set the Controller's Enable/Disable switch to Enable to start the unit.
7. The unit should begin its start sequence, then shut down and display Prg Switch Open During Purge.
8. Replace the wire on the Purge switch and press the CLEAR button. The unit should restart.
Figure 5-8: Air/Fuel Purge and Ignition Locations

5.11 Ignition Switch Open During Ignition

The Ignition and Purge switches are on the Air/Fuel Valve. To check the switches:
1. Set the Controller's Enable/Disable switch to Disable.
2. Go to Main Menu→Diagnostics→Manual Run and then put the unit in Manual Mode.
3. Set the valve position between 25% and 30% using the + (Plus) and – (Minus) controls.
4. Remove the Air/Fuel Valve cover (Figure 5-10) by rotating it counterclockwise.
5. Remove one of the two wires (#169 or #170) from Ignition switch (Figure 5-11a – 5-11c).
6. Set the Controller's Enable/Disable switch to Enable to start the unit.
7. The unit should start then shut down and display Ign Switch Open During Ignition.
8. Replace the wire on the Ignition switch and press CLEAR. The unit should restart.

5.12 Safety Pressure Relief Valve Test

Test the safety Pressure Relief Valve as per ASME Boiler and Pressure Vessel Code, Section VI.
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