Ssov Proof Of Closure Switch Check - Watts AERCO CFR 1500 Operation And Service Manual

SECTION 5 SAFETY DEVICE TESTING
Main Menu → Diagnostics → Manual Mode
4. Go to:
a) Ramp boiler to 100% fire rate and set the Controller's Enable/Disable switch to Enable.
b) When the Controller enters ignition phase, it shows Ignition Trial. Attach the alligator clip
(Figure 5-8) to any metal surface or ground. The Controller displays Flame Proven and begins to
ramp up to 100% fire rate. Note that no gas or flame is present at this time.
5. Wait for the boiler to ramp up to at least 90% before continuing.
6. Cover the combustion air inlet opening with a solid, flat object, such as a piece of thick plywood or a
thick metal plate.
7. The unit should shut down and display Airflow Fault During Run. This step confirms proper
operation of the Blocked Inlet switch.
8. Remove cover from the air inlet opening and reinstall the Combustion Air Duct or air filter.
9. Remove the jumper wires installed in step 3 and replace the black connector boot on the Flame
Detector. Press the CLEAR button. The unit should restart.

5.9 SSOV Proof of Closure Switch Check

The SSOV contains the Proof of Closure switch. To check switch circuit:
1. Set the Controller's Enable/Disable switch to Disable.
Main Menu → Diagnostics → Manual Mode
2. Go to:
3. Set the valve position between 25% and 30% using the + (Plus) and – (Minus) controls.
4. Remove the cover from the SSOV by loosening the screw shown in Figure 5-9. Lift off the cover to
access the terminal wiring connections.
5. Disconnect wire #148 from the SSOV to "open" the Proof Of Closure switch circuit.
6. The unit should fault and display SSOV Switch Open.
7. Replace wire #148 and press the CLEAR button.
8. Set the Controller's Enable/Disable switch to Enable to start the unit.
9. Remove the wire again when the unit reaches the purge cycle and Purging is displayed.
10. The unit should shut down and display SSOV Fault During Purge.
11. Replace the wire on the SSOV and press the CLEAR button. The unit should restart.
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Figure 5-7: SSOV Actuator Cover Location
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and put the unit in Manual Mode, then:
and put the unit in Manual Mode.
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