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Benchmark 5000-6000 Boiler Installation & Startup Manual
SECTION 5: SAFETY DEVICE TESTING
5.10 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 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 Air/Fuel Valve cover by rotating the cover counterclockwise to unlock it (see
Figure 5-9).
4. Remove one of the two wires (#171 or #172) from the Purge switch (Figure 5-10).
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.
OMM-0123_E • GF-207 • 12/17/2019
Figure 5-9: Air/Fuel Valve Cover Location
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
AIR/FUEL VALVE COVER
(ROTATE TO REMOVE)
Page 74 of 95
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