Ssov Proof Of Closure Switch Check - Watts Aerco Benchmark OMM-0124 Installation And Start-Up Manual

Benchmark 5000-6000 Boiler Installation & Startup Manual
SECTION 5: SAFETY DEVICE TESTING

5.9 SSOV PROOF OF CLOSURE SWITCH CHECK

The SSOV, shown in Figure 5-8, contains the Proof of Closure switch. The Proof of Closure
switch circuit is checked as follows:
SSOV Proof Of Closure Switch Check Instructions
1. Set the unit's ON/OFF switch to the OFF position.
2. Place the unit in MANUAL mode and set the valve position between 25% and 30%.
3. Remove the cover from the SSOV by loosening the screw shown in Figure 5-8. Lift off the
cover to access the terminal wiring connections.
4. Disconnect wire #148 from the SSOV to "open" the Proof Of Closure switch circuit.
5. The unit should fault and display SSOV SWITCH OPEN.
6. Replace wire #148 and press the CLEAR button.
7. Set the ON/OFF switch to the ON position to start the unit.
8. Remove the wire again when the unit reaches the purge cycle and PURGING is displayed.
9. The unit should shut down and display SSOV FAULT DURING PURGE.
10. Replace the wire on the SSOV and press the CLEAR button. The unit should restart.
SSOV ACTUATOR
OMM-0123_E • GF-207 • 12/17/2019
COVER
Figure 5-8: SSOV Actuator Cover Location
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ACTUATOR
COVER SCREW
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