AERCO BMK 2000DF - Manual (Page 111)

Benchmark 1500DF - 2000DF Boilers
CHAPTER 8 – TROUBLESHOOTING GUIDE
OMM-0098_0A AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 111 of 196
GF-144 Ph.: 800-526-0288 04/01/2014
TABLE 8-1: BOILER TROUBLESHOOTING – Continued
FAULT INDICATION PROBABLE CAUSES CORRECTIVE ACTION
INTERLOCK
OPEN
1. Interlock jumper not installed or
removed.
2. Energy Management System
does not have unit enabled.
3. Device proving switch hooked to
interlocks is not closed.
1. Check for a jumper properly installed across the interlock terminals
in the I/O box.
2. If there are two external wires on these terminals check any Energy
Management system to see if they have the units disabled (a jumper
may be temporarily installed to see if the interlock circuit is
functioning).
3. Check that proving switch for any device hooked to the interlock
circuit is closing and that the device is operational.
LINE VOLTAGE
OUT OF PHASE
1. Line and Neutral switched in AC
Power Box.
2. Incorrect power supply
transformer wiring.
1. Check hot and neutral in AC Power Box to ensure they are not
reversed.
2. Check transformer wiring, in AC Power Box, against the power box
transformer wiring diagram to ensure it is wired correctly.
LOW GAS
PRESSURE
1. Incorrect supply gas pressure.
2. Defective Low Pressure Gas
Switch.
1. Measure gas pressure upstream of the SSOV Actuator(s) with the
unit firing. For FM gas trains, ensure it is between 6.0” W.C. and
14” W.C.
For DBB gas trains, ensure it is between 6.5" W.C. and
14” W.C.
(see section. 4.3).
2. Measure gas pressure at the low gas pressure switch. If it is greater
than 4.7” W.C. (for both BMK 1500 and BMK 2000), measure
continuity across the switch and replace if necessary.
LOW WATER
LEVEL
1. Insufficient water level in system.
2. Defective water level circuitry.
3. Defective water level probe.
1. Check system for sufficient water level.
2. Test water level circuitry using the Control Box front panel LOW
WATER TEST and RESET buttons. Replace water level circuitry if
it does not respond.
3. Check continuity of probe end to the shell, change probe if there is
no continuity.
MODBUS
COMMFAULT
Unit not seeing information from
Modbus network.
Check network connections. If fault persists, contact qualified
Service Personnel.
PRG SWTCH CLOSED
DURING IGNITION
1. A/F Valve rotated open to purge
and did not rotate to ignition
position.
1. Start the unit. The Air/Fuel Valve should rotate to the purge (open)
position, then back to ignition position (towards closed) during the
ignition cycle. If the valve does not rotate back to the ignition
position, check the Air/Fuel Valve calibration. If calibration is okay,
the problem may be in the Air/Fuel Valve or the Control Box. Refer
fault to qualified service personnel.