Watts AERCO Benchmark OMM-0136 Operation And Service Manual page 146

Benchmark Platinum-Edge [II]: Operation-Service Manual
SECTION 6 – TROUBLESHOOTING
TABLE 10-1: Boiler Troubleshooting Procedures
Fault Probable Causes
Interlock jumper not installed or removed.
1.
Energy Management System does not have
2.
INTERLOCK unit enabled.
OPEN
Device proving switch hooked to interlocks is
3.
not closed.
Line and Neutral switched in AC Power Box.
1.
LINE
VOLTAGE OUT
Incorrect power supply transformer wiring.
2.
OF PHASE
Incorrect supply gas pressure.
1.
LOW GAS
Defective Low Gas Pressure switch.
2.
PRESSURE
Insufficient water level in system.
1.
Defective water level circuitry.
2.
LOW WATER
LEVEL
Defective water level probe.
3.
MODBUS Unit not seeing information from Modbus
COMMFAULT network.
OMM-0137_E • GF-211 •
12/13/2019
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Corrective Action
Check for a jumper properly installed across the interlock terminals
1.
in the I/O box.
If there are two external wires on these terminals check any Energy
2.
Management system to see if they have the units disabled (a
jumper may be temporarily installed to see if the interlock circuit is
functioning).
Check that proving switch for any device hooked to the interlock
3.
circuit is closing and that the device is operational.
Check hot and neutral in AC Power Box to ensure they are not
1.
reversed.
Check transformer wiring, in AC Power Box, against the power box
2.
transformer wiring diagram to ensure it is wired correctly.
Measure gas pressure upstream of the SSOV Actuator(s) with the
1.
unit firing. Ensure it is above the value in Table 4-2 (Natural Gas)
or Table 4-5 (Propane).
Measure gas pressure at the Low Gas Pressure switch. If it is
2.
greater than 1 inch above the Low Gas Pressure switch
setting in Table 4-2 (Natural Gas) or Table 4-5 (Propane),
measure continuity across the switch and replace if necessary.
Check system for sufficient water level.
1.
Test water level circuitry using the Low Water TEST and RESET
2.
buttons on the Controller's front panel. Replace water level
circuitry if it does not respond.
Check continuity of probe end to the shell, change probe if there is
3.
no continuity.
Check network connections. If fault persists, contact qualified
Service Personnel.
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