AERCO BMK 6000 - Manual (Page 87)

Benchmark 6000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 6 – SAFETY DEVICE TESTING
OMM-0086_0D AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 87 of 210
GF-133
Ph.: 800-526-0288
03/20/14
6.9 SSOV PROOF OF CLOSURE SWITCH
The downstream SSOV shown in Figure 6-1 contains the proof of closure (POC) switch. The
proof of closure switch circuit is checked as follows:
SSOV Proof of Closure Switch
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. Refer to Figure 6-1 and locate the downstream SSOV.
4. Remove the cover from the SSOV by loosening the screw shown in Figure 6-6. 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 ON/OFF switch to the ON position 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.
Figure 6-6: Downstream SSOV Actuator Cover Location
SSOV
ACTUATOR
COVER
ACTUATOR
COVER
SCREW