14
Figure 14 – Typical Wiring (R7184B)
Typical Burner Sequence of Operation -
7184B Control
Refer to the appliance manufacturer’s wiring diagram for actual
speci
fi
cations.
Standby
— The burner is idle, waiting for a call for heat.
When a call for heat is initiated, there is a 3- to 10-second
delay while the control performs a safe start check.
Valve-on delay
— As applicable, the ignition and motor
are turned on for a 15-second prepurge.
Trial for ignition (TFI)
— The fuel valve is opened, as
applicable. A
fl
ame should be established within the 15-
second lockout time (30-second lockout time is available).
Lockout
— If
fl
ame is not sensed by the end of the TFI,
the control shuts down on safety lockout and must be
manually reset. If the control locks out three times in a
row, the control enters restricted lockout. Call a quali
fi
ed
service technician.
Ignition carryover
— Once
fl
ame is established, the
ignition remains on for 10 seconds to ensure
fl
ame
stability. It then turns off.
Run
— With a
fl
ame established and the control
continuing to detect a
fl
ame, the burner will operate in the
RUN Mode until the load demand is satis
fi
ed or a limit
opens.
If terminals RC1 and RC2 are jumpered, the burner
operates in the Low-High-Off Mode. The burner starts
at Low, goes to High after the
fl
ame stabilization
1.
2.
3.
4.
5.
6.
a.
period. Flame is extinguished when the load is
satis
fi
ed or a limit opens, and the burner is sent to
Motor-Off Delay.
If a high/low control has been wired between
terminals RC1 and RC2 the burner starts at Low and
is released to go High after the
fl
ame stabilization
period. It can repeatedly cycle between low and high
as necessary to meet load demand until the load is
satis
fi
ed or a limit opens. The burner is then sent to
Motor-off Delay.
Recycle
— If the
fl
ame is lost while the burner is
fi
ring,
the control shuts down the burner, enters a 60-second
recycle delay, and then repeats the ignition steps outlined
above. If the
fl
ame is lost three times in a row, the control
locks out to prevent continuous cycling with repetitious
fl
ame loss caused by poor combustion.
Burner motor-off delay
— The fuel valve is closed and
the burner motor is kept on for the selected postpurge
time before the control returns the burner to standby.
Cad Cell Resistance Indicator:
During the burner run
state, click the reset button (less than 1 second) to check
the cad cell resistance range. The yellow light will
fl
ash 1
to 4 times, depending on the amount of light detected by
the cad cell.
See
Figure 15
for Sequence of Operation illustration.
Restricted Lockout
If the control locks out three times in a row without a
b.
7.
8.
Section: Wire the Burner
