Benchmark 1500 - 2000 Boilers
CHAPTER 6 – SAFETY DEVICE TESTING
Page 82 of 182 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0097_0E
10/01/2015 Ph.: 800-526-0288 GF-142
Blocked Inlet Switch Test – Continued
WARNING!
The blower suction is very strong and can pull nearby objects into
the blower’s fan blades. Do NOT allow anything to be pulled
into the blower! Do not wear anything that could get caught and
pull you into the blower.
3. Turn off the gas supply ball valve to the boiler and then complete the following steps:
(a) Use jumper wires to jump out the Low Gas Pressure switch and the Blower Proof
switch.
(b) Remove the black connector boot from the Flame Detector.
(c) Connect the Flame Signal Generator to the black connector boot.
Figure 6-4: Connecting the Flame Signal Generator
(d) Keep the alligator clip away from bare metal parts until step 4c.
4. Complete the following with the boiler operating in MANUAL mode:
(a) Ramp the boiler up to 100% fire rate and then turn the main ON/OFF switch on the
front of the Control Panel to the ON position.
(b) Push the BACK button three (3) times to return to the upper level menu.
(c) When the Controller gets into the ignition phase, the Control Panel will show
IGNITION TRIAL. At that point attach the alligator clip (see Figure 6-4) to any bare
metal surface or ground. The C-More display should now show FLAME PROVEN
and begin to ramp up to 100% fire rate. Note that no gas or flame is present in the
boiler at this time.
5. Wait for the boiler to ramp up to at least 90% before continuing.
6. Cover the combustion air inlet opening with a solid, flat object, such as a piece of thick
plywood or a thick metal plate.
7. The unit should shut down and display AIRFLOW FAULT DURING RUN. This step
confirms proper operation of the Blocked Inlet switch.
8. Remove the cover from the air inlet opening and reinstall the Combustion Air Duct or air
filter.
9. Remove the jumper wires installed in step 2 and replace the black connector boot on the
Flame Detector.
10. Press the CLEAR button. The unit should restart.
Connector Boot
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