RBI Gas boilers - Combustion Air Damper

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COMBUST AIR DAMPER: If the combustion air damper has
been selected for use (MASTER BOILER, AUX FUNCTIONS),
and the proof switch does not make, this fault will be displayed.
When the combustion air damper is used, the master’s BOILER3/
DAMPER relay contacts at J13 are closed.  ese should be wired
to the combustion air damper or preferably an isolation relay.
 e prove switch on the combustion air damper must be wired to
J10B, SPARE 1.
FAULT
SYSTEM SET
160˚F
COMBUSTION AIR DAMPER
When the master boiler receives a call for heat and needs to start a
boiler, the BOILER3/DAMPER relay K5 closes. At the same time,
the boiler is started,  res, and continues to  re. If the combustion air
damper does not prove within the proof time speci ed in the
combustion air damper menu, the boiler will shut down and display
the fault.  e fault on the Master boiler can be cleared by removing
the call for heat on the master boiler and  xing the combustion air
damper problem. A combustion damper fault on a Member boiler
can only be cleared by power cycling.
 e Master boiler controls a system damper and Member boilers
control their own respective dampers. When the call for heat is
removed, the damper will remain open for 30 seconds before closing.
 is allows for post purge cycles to complete.
OPEN ***** SENSOR: If the open sensor fault is displayed, the
sensor in the position reported was originally detected, but has
since opened.  e boiler will shut down on any OPEN sensor.
FAULT
SYSTEM SET
160˚F
OPEN OUTSIDE SENSOR
SHORTED ***** SENSOR: If the shorted sensor fault is displayed,
the sensor in the position reported was originally detected, but
has since shorted.  e boiler will shut down on any SHORTED
sensor.
FAULT
SYSTEM SET
160˚F
SHORTED OUTSIDE SENSOR
DELTA TEMP > 40°F: If the temperature across the heat exchanger
rises above the maximum designated temperature for the Futera
Fusion model boiler, a warning or fault will be displayed.  is
protection is required to prevent damage to the heat exchanger in the
event high di erential temperatures are encountered.  e fault or
warning condition may be changed in the AUX FUNCTIONS
menu under ALARM TYPE.  e default condition is WARNING
with LIM->HALF  TE = YES.
When this condition exists and the ALARM TYPE is set to
WARNING and LIM-> HALF  TE, the boiler is limited to 1/2
it’s input rate. So, if the boiler is trying to  re at 80%, the rate is
limited to 40% until the temperature across the heat exchanger
falls at least 10°F below the maximum designated temperature
for the Futera Fusion boiler model. In this case: 40°F - 10°F = 30°F.
If the ALARM TYPE is set to FAULT, the boiler will display the
FAULT message and this condition will be treated as an interlock,
thus shu ing down the boiler until the Delta Temp drops 10°F
below the maximum designated temperature.
1/2 INPUT
DELTA TEMP > 40°F
LOCAL SET
41˚F
RETURN TEMP < 130°F: If the Return Inlet temperature is less
than 130°F this warning will be displayed.  is warning does not
a ect operation and does not set the alarm relay. A log entry is
made to aide in diagnosing why this may be occurring. Condensing
will occur with return temperatures below 130°F and a shortened
heat exchanger life will occur.
PREPURGE
RETURN TEMP < 130°F
LOCAL SET
41˚F