Install Instructions

Part number 550-100-090/1113
105
GAS-FIRED WATER BOILER — Boiler Manual
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Troubleshooting (continued)
Display
Condition Diagnostics Corrective Action(s)
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Occurs when display
communications out for 30
seconds.
Automatically resets when
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established.
Check for a loose connection at the molex plug on the control and
connection on the back of the display.
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Occurs when manual or
automatic reset limit opens.
Automatic external limit will
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limit device closes.
Manual limit fault must be reset
by choosing Reset Lockout on
the display.
Is there an external safety device connected? If yes, trouble shoot the
external limit to determine and correct the cause that opened the limit.
Also check for loose wiring connections.
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P13.
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external limit.
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reset external limit.
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-*.*5
Boiler temperature sensor
reached High Temp Limit
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Reset using manual reset screen
on display.
Verify all isolation valves are open and circulators are programmed into
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Setup section to configure these properly for the system.
Verify water pipe is installed correctly using primary/secondary
connection to the boiler loop. Refer to Figure 4 page 11 for example of
primary/secondary connection.
Minimum pipe sizes
6MUSBNJOJNVN inch
6MUSBNJOJNVN inch
6MUSBNJOJNVN inch
Verify proper circulator sizing for boiler size and system requirements
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Boiler ship with proper size circulators:
6MUSB5BDP
6MUSB5BDP
6MUSB5BDP0013
See message displayed TEMPERATURE SENSOR and follow procedure for
loose connections.
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Occurs when flame is
detected when there should
be no flame.
Reset using manual reset screen
on display.
Burner may be operating too hot due to incorrect combustion. Inspect
flame and conduct combustion test.
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correct using the maintenance and startup procedure in this manual.
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INPUTS screen when the gas valve closes.
Check for flame at burner via flame current with burner off. Turn boiler
off and watch flame through observation port. If flame continues after
shutdown replace gas valve and venturi.
Troubleshooting (continued)
Figure 112 Troubleshooting suggestions for Ultra boilers (continued)