AERCO BMK 6000 Dual Fuel User Manual
Page 125
Benchmark 6000 DF Installation, Operation & Maintenance Manual
CHAPTER 8 – TROUBLESHOOTING GUIDE
OMM-0096_0B
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Page 125 of 219
GF-141
Ph.: 800-526-0288
03/21/2014
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
GAS PRESSURE FAULT
(Due to 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
4.0” W.C. and 14” W.C. For DBB gas trains, ensure it is
between 4.5" W.C. and 14” W.C. (see section. 2.8.1).
2.
Measure gas pressure at the Low Gas Pressure switch. If it
is greater than 2.6” W.C., 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.