Table of Contents
Advertisement
Section: Burner Control
Burner Control
Sequence of Operation - GeniSys 7505.
Refer to the appliance manufacturer's wiring diagram for
actual specifi cations.
1.
Standby: The burner is idle, waiting for a call for
heat.
2.
Valve-On Delay: The igniter and motor are on while
the control delays turning on the oil solenoid valve
for the programmed time.
3.
Trial For Ignition: The oil solenoid valve is
energized. A fl ame should be established within the
factory set trial for ignition time (lockout time).
4.
Lockout: The control has shut down for one of the
following safety reasons:
a.
The trial for ignition (lockout) time expired
without fl ame being established.
b.
The cad cell detected fl ame at the end of the
Valve On Delay state.
To reset the control from lockout click the button
1-second.
NOTE: A recurrence of the above failure modes
or a failed welded relay check could cause the
control to enter a Hard Lockout state that must
be reset only by a qualifi ed service technician.
To reset from Hard Lockout, hold the reset button
for 15 seconds until the yellow light turns on.
5.
Ignition Carryover: Once fl ame is established,
the igniter remains on for 10 additional seconds to
ensure fl ame stability.
6.
Run: The fl ame is sustained until the call for heat
is satisfi ed. The burner is then sent to Motor-Off
Delay, if applicable, or it is shut down
and sent to Standby.
7.
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 repeats the ignition
sequence. The control will continue
to Recycle each time the fl ame is lost,
until it reaches a pre-set time allotment.
The control will then go into Hard
Lockout instead of recycle. This feature
prevents excessive accumulation of oil
in the appliance fi ring chamber.
8.
Motor-Off Delay: If applicable, the oil
12
solenoid valve is turned off and the control delays
turning the motor off for the set motor-off delay time
before the control returns to standby.
9.
Pump Prime: The igniter and motor are on with the
oil solenoid valve energized for 4 minutes. During
Pump Prime mode, the cad cell is disregarded,
allowing the technician to prime the pump without
having to jumper the cad cell.
10.
Cad Cell Resistance Indicator: If the Beckett
7505 control is equipped with the GeniSys Display
Module, part 52067U, the cad cell resistance can
be selected and read on the LCD screen. Also,
the GeniSys Contractor Tool, part 52082U, can be
used for this purpose.
If these are not available, the cad cell leads can
be unplugged from the control and the resistance
measured with a meter in the conventional way.
Conduct these tests with fl ame present.
Flame Detection Range
Normal = 0 to 1600 ohms
Limited = 1600 ohms to lockout
Honeywell R7184 Primary Control
The R7184 primary control with valve-on delay and
burner motor-off delay, shown in Figure 9, requires
a constant 120 volt AC power source supplied to the
black wire on the control. (Refer to the appliance
manufacturer's instructions.) The red wire goes to the
appliance limit circuit. Please note that other control
manufacturers may use different wire colors for power
and limit connections.
1
3
2
Valve-on delay
5
Ignition carryover
6
8
Motor-off delay
9
Pump
Standby
prime
4
Trial for
Lockout
Ignition
7
Run
Recycle
Advertisement
Table of Contents
