FULTON Endura EDR 750 Nstallation, Operation And Maintenance Manual page 83

MAINTENANCE
Troubleshooting
Use the following table as a guide to troubleshooting your boiler.
PROBLEM
No Power / Control Does
not Illuminate
Nuisance Manual Reset
High Temperature Limit
Lockouts
High Back Pressure Switch
Trips
Tender No. MET21-117
4-10
CAUSE CHECK
Power / Wiring / Check fusing and replace as necessary.
Connections
Cycle power to the boiler.
Measure incoming voltage to boiler and verify it is in compliance with 120VAC requirements.
Verify control power supply voltage.
Verify all power plugs are fastened securely to control devices.
Verify that the display mounting clips are not over tightened.
Verify wiring between terminal blocks, power supplies and control devices.
Controller/Settings Verify the setting on the mechanical Manual Reset High Limit (MRHL) device, it must always
be higher than the sum of the temperature setpoint plus off hysteresis value. The factory
recommended setting is 200°F.
Check the supply temperature setpoint setting parameter in the boiler control or Building
Management System setpoint signal where applicable. The closer the setpoint setting is to
the MRHL setting, the higher the likelihood of a lockout.
Installation Verify balancing valves (if used) have been properly commissioned.
For modular boiler plants, ensure piping is configured reverse return where the first boiler in is
the last boiler out. If the piping configuration is not reverse return, balancing valves should be
installed and properly commissioned to ensure each boiler is receiving relatively equal water
flow.
Verify the boiler is receiving enough flow at the current heat demand for the given hydronic
fluid type and desired delta-T. If calibrated flow meters are not available, flow rate can be
approximated by calculation by observing the delta-T across the boiler heat exchanger at a
given firing rate. See the Fulton "Calculating Flow Rate" Engineering Guide for more details.
Installation Measure draft pressure at the flue gas outlet of the boiler during pre-purge, steady-state
high fire, and post-purge conditions. The measurement must not exceed the maximum
value listed in Table 4. If the stack pressure is exceeded, remove flue rain caps or velocity
cones (if installed) and measure again.
Verify any horizontal runs maintain minimum pitch.
Inspect the horizontal venting sections for low spots. There must not be any low spots in
the flue gas vent.
Inspect boiler and stack condensate drains and ensure there are no obstructions or debris
that would prevent free drainage.
Inspect venting for internal obstructions to proper condensate drainage such as excessive
use of RTV, undersized gaskets or debris.
Design & Build RFP: Gas Heating Upgrade
Replacement in Dartmouth
SECTION 4
EDR-PURE-IOM-210617
Addendum #5 Page 83 of 105
© Fulton Group N.A., Inc. 2020