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
