Benchmark 1500 - 2000 Boilers
CHAPTER 6 – SAFETY DEVICE TESTING
Page 84 of 182 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0097_0E
10/01/2015 Ph.: 800-526-0288 GF-142
Figure 6-6: SSOV Actuator Cover Location
6.10 PURGE SWITCH OPEN DURING PURGE
The Purge switch (and Ignition switch) is located on the Air/Fuel Valve. To check the switch,
proceed as follows:
Purge Switch Open During Purge
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 Air/Fuel Valve cover by rotating the cover counterclockwise to unlock it
(see Figure 6-7).
4. Remove one of the two wires (#171 or #172) from the Purge switch (Figure 6-8).
5. Initiate a unit start sequence.
6. The unit should begin its start sequence, then shut down and display PRG SWITCH
OPEN DURING PURGE.
7. Replace the wire on the Purge switch and depress the CLEAR button. The unit should
restart.
ACTUATOR
COVER
COVER
SCREW
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