Endurance
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7.
10 seconds after establishing combustion and
proof of flame (via the flame rod signal to
ground), the ignitor will be de-energized.
8.
For EDP/EDN units only, the display should
indicate a rapid rise in temperature to 150º F (1-2
min. duration). During this period the
thermostatic union at the flow outlet is closed
and the boiler is operating in the internal
recirculation mode. [Service note: If the
temperature rise is not rapid the thermostat may
be defective.] At 150° F the thermostat will
allow increased flow to the system.
9.
A gradual rise in temperature will be indicated
until the temperature approaches the Burner
Control Point. The firing rate will modulate
based on the rate of change in temperature as it
seeks the control point.
10. If, during a call for heat, the temperature reaches
the Burner Off Point, the Endurance combustion
will be de-energized, and will allow the
temperature to fall to the Burner On Point before
turning on again.
11. When the call for heat ends on an EDP or EDN
model, the gas valve shuts off, and the pump
post-purge begins, if activated. When the call for
heat ends on an EBP model, the anti-condensing
valve closes, and the Endurance goes into tank
charge mode, until the burner off point
temperature is achieved on the supply sensor.
9.2.1 Fault Code Identification
The boiler control can display the following fault
codes:
•
F1 = Boiler control internal error
•
F3 = Gas valve status is on, with no call for
heat
•
F4 = Supply sensor error
•
F5 = Tank sensor error (EBP only)
•
F6 = Return sensor error
•
F8 = OAT sensor unreliable
•
LO = Lockout
•
OFF = Controller is off
•
ICE = Low temperature protection
The boiler shows an alarm condition by flashing
the code and then showing the supply temperature. All
of the fault conditions shown on the boiler control will
prevent the Endurance from operating, with the
exception of F8. If the outside air temperature sensor
is found by the controller to be unreliable, the
controller will override the outdoor reset function, and
will run the Endurance in setpoint mode, instead of
outdoor reset mode.
The ignition control uses LED indication to
display the following fault codes:
•
Steady On = Internal control failure
•
2 Flashes = Erroneous flame signal
•
3 Flashes = Ignition Control Lockout
9.2.2 Fault Correction
F-1 Switch off boiler and restart. If F-1 repeats,
replace boiler control.
F-3 In normal operation, the ignition control
sends a “gas valve energized” signal to the
boiler control, so the controller will be able
to time its PI algorithms correctly. An F-3
fault code indicates that the ignition control
is sending a signal that the gas valve has
been energized, but there is no call for heat.
The boiler control will not allow the
Endurance to fire in this condition. This
fault indicates that there is either something
mis-wired on the boiler, or that the relay in
this circuit has seized. Check the relay for
seized contacts first, and if the relay is
operational, check the wiring circuit on the
boiler.
F-4 Check for damaged wiring or poor
connection at sensor plug. If they are OK
disconnect the sensor plug and check the
resistance across the sensor terminals. The
resistance of a good sensor is 10,000 ohms
@ 77°F (25°C). Replace sensor if
resistance is less than 500 or more than
20,000 ohms.
F-5 Correct in the same manner as F-4.
F-6 Correct in the same manner as F-4.
F-8 Check that the outdoor air sensor is
installed properly, and that the wire and/or
connection are not damaged. If okay,
disconnect the sensor and check the
resistance across the sensor terminals. The
resistance of a good sensor is 10,000 ohms
at 77°F (25°C). Replace sensor is resistance
is less than 500 or more than 20,000 ohms.
LO See Section 9.2.3
OFF Control power is off. Press and hold the
power button (upper left button) on the
boiler control for 3 seconds to restore
control power. The control will flash “ON”
and then will return to normal operation.
9.2.3 Resolving Lockouts (LO)
There are many causes for lockouts. The six
most common causes are: (a) poor combustion,
(b) poor flame sensor signal, (c) inadequate gas
supply, (d) ignitor failure, (e) blocked or contaminated
air source, (f) safety limit trip. If you get LO on boiler
control, you need to check the ignition control to see if
