Aerco BENCHMARK 2500DF User Manual page 85

Benchmark 2500DF-3000DF Installation, Operation & Maintenance Manual
The Blower suction is very strong and can pull nearby objects into
the Blower's fan blades. Do 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 6.3a: 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 on the main ON/OFF switch on
the front of the Control Panel.
(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 6.3a) 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.
OMM-0099_0A
GF-145
CHAPTER 6 – SAFETY DEVICE TESTING
Blocked Inlet Switch Test – Continued
WARNING!
Flame Signal Generator
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
Flame Detector
Connector Boot
TO WIRE HARNESS
Page 85 of 234
PR1: 05/21/2014