Air Flow Fault Tests - Blower Proof & Blocked Inlet Switches; Blower Proof Switch Test - Watts AERCO Edge CFR 3000 Operator's And Service Manual

SECTION 5 SAFETY DEVICE TESTING
2. On the Controller, go
3. Enable the Manual Run control.
4. Set the valve position between 25% and 30% using the + (Plus) and – (Minus) controls.
5. Close the gas train's Manual Shutoff valve located between the Safety Shut-Off Valve (SSOV) and the
Air/Fuel Valve, as shown on Figure 5-3a to 5-3c, above.
6. It may be necessary to jump out the High Gas Pressure switch.
7. Set the Controller's Enable/Disable switch to Enable to start the unit.
8. The unit should purge and light the Pilot flame and then shut down after reaching the main Burner
Ignition cycle and display Flame Loss During Ign.
9. Open the Manual Shutoff valve closed in step 5 and press the CLEAR soft key.
10. Restart the unit and allow it to prove flame.
11. Once flame is proven, close the Manual Shutoff valve between the SSOV and the Air/Fuel Valve.
12. The unit will lock out and Flame Loss During Run will flash in the display.
13. Open the manual gas valve closed in step 11 and press CLEAR. The unit should restart and fire.
5.8 Air Flow Fault Tests - Blower Proof & Blocked Inlet Switches

5.8.1 Blower Proof Switch Test

1. Set the Controller's Enable/Disable switch to Disable.
2. Depending on the model, remove the side and/or front panels to gain access to the Blower Proof
Switch (see Figures above for location).
3. Use a Phillips head screw drive to remove the front cover from the switch to reveal the switch
setting indicator dial (0.3 in the Figure below).
4. Set the Enable/Disable switch to Enable and wait for boiler to go into the Purge sequence.
5. After about 5 seconds, with air flowing into the combustion chamber, slowly turn the dial clockwise
(to higher value) until the unit trips off with an Air Flow Fault During Purge message. Optionally,
attach a manometer and measure the setting at the trip point.
After the boiler shuts down, reset the dial indicator to its original position, shown on the switch
cover label, then replace the switch cover. Reset the
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Main Menu → Diagnostics → Manual
to:
Figure 5-4: Blower Proof Switch
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Mode.
boiler.
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