Benchmark 1500 - 2000 Boilers
CHAPTER 6 – SAFETY DEVICE TESTING
OMM-0097_0D
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
81
of
188
GF-142
Ph.: 800-526-0288
Figure 6-4: Boiler Rear View Showing Air Inlet Location
6.9 SSOV PROOF OF CLOSURE SWITCH
The SSOV shown in Figure 6-1 contains the proof of closure 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 SSOV.
4. Remove the cover from the SSOV by loosening the screw shown in Figure 6-5. 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.
AIR INLET
(Combustion Air
Duct removed)
PRIMARY
WATER INLET
DRAIN VALVE
ANALYZER
PORT
EXHAST
MANIFOLD
CONDENSATE DRAIN
