Benchmark 1500 - 2000 Boilers
CHAPTER 6 – SAFETY DEVICE TESTING
OMM-0097_0E AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 85 of 182
GF-142 Ph.: 800-526-0288 10/01/2015
6.11 IGNITION SWITCH OPEN DURING IGNITION
The Ignition switch (and the Purge switch) is located on the Air/Fuel Valve. To check the
switch, proceed as follows:
Ignition Switch Open During Ignition
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 (Figure 6-7) by rotating the cover counterclockwise to
unlock and lift up to remove.
4. Remove one of the two wires (#169 or #170) from the Ignition switch (see Figure 6-8).
5. Initiate a unit start sequence.
6. The unit should begin its start sequence and then shut down and display IGN SWITCH
OPEN DURING IGNITION.
7. Replace the wire on the Ignition switch and press the CLEAR button. The unit should
restart.
Figure 6-7: Air/Fuel Valve Cover Location
AIR/FUEL VALVE COVER
(Rotate Counter-Clock-Wise
to Remove)
AIR/FUEL
VALVE
INLET
SWITCH
BLOWER PROOF
SWITCH
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