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Benchmark 2500DF-3000DF Installation, Operation & Maintenance Manual
FAULT INDICATION
O2 % OUT OF RANGE
RECIRC PUMP FAILURE
REMOTE SETPT
SIGNAL FAULT
RESIDUAL
FLAME
OMM-0099_0A
GF-145
CHAPTER 8 – TROUBLESHOOTING GUIDE
TABLE 8-1: BOILER TROUBLESHOOTING – Continued
PROBABLE CAUSES
1. Combustion Calibration incorrect.
2. Blocked inlet air duct or louver.
1. Internal recirculation pump failed.
1. Remote setpoint signal not present:
Not yet installed.
Wrong polarity.
Signal defective at source.
Broken or loose wiring.
2. Signal is not isolated (floating) if 4 to
20 mA.
3. Control Box signal type selection
switches not set for correct signal
type (voltage or current).
1. Defective Flame Detector.
2. SSOV not fully closed.
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
1. Check Combustion Analyzer and recalibrate Boiler.
2. Unblock air inlet and measure open area for combustion air to the
room.
1. Replace recirculation pump.
1. Check I/O Box to ensure signal is hooked up.
Hook up if not installed.
If installed, check polarity.
Measure signal level.
Check continuity of wiring between source and unit.
2. Check signal at source to ensure it is isolated.
3. Check DIP switch on PMC board to ensure it is set correctly for the
type of signal being sent. Check control signal type set in
Configuration Menu.
1. Replace Flame Detector.
2. Check open/close indicator window of Safety Shut-Off Valve (SSOV)
and ensure that the SSOV is fully closed. If not fully closed, replace
the valve and or actuator.
Close the 2" Gas Shut-Off Valve downstream of SSOV (Figure 6-1a).
Install a manometer or gauge at the leak detection port between the
SSOV and Gas Shut Off Valve. If a gas pressure reading is observed
replace the SSOV Valve and/or Actuator.
Ph.: 800-526-0288
CORRECTIVE ACTION
Page 113 of 234
PR1: 05/21/2014
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