R7184A,B,P,U
Interrupted Electronic Oil Primary
INSTALLATION INSTRUCTIONS
lockout timing will be extended to 4 minutes and the
APPLICATION
ignition set in the intermittent mode for this cycle only.
The R7184 automatically reverts to its labeled interrupted
and safety switch timing states. The pump priming cycle
can only be entered if there have been no lockout
occurrences since the last successful heat call. To reset
the device so that the pump priming cycle can be
entered, press and hold the reset button for 30 seconds
until the LED flashes twice.
The R7184A,B,P,U Interrupted Electronic Oil Primary is a
line voltage, safety rated, interrupted ignition oil primary
control for residential oil fired burners used in boilers,
forced air furnaces and water heaters. The
R7184A,B,P,U used with a cad cell flame sensor,
operates an oil burner and optional oil valve. The primary
controls fuel oil, senses flame, controls ignition spark and
notifies a remote alarm circuit when in lockout.
Disable Function
The R7184 can be used with both hydronic and forced air
systems. When used with hydronic systems, line voltage
switching Aquastat® Controllers normally provide for the
starting and stopping of the combustion sequences. With
forced air systems, both mechanical and electronic low
voltage thermostats control the starting and stopping of
the combustion process.
Pressing and holding the reset button will disable all
functions until the button is released. The R7184 will
restart at the beginning of the normal heat cycle on
safety check.
Limited Reset (Restricted Mode)
In order to limit the accumulation of unburned oil in the
combustion area, the control can only be reset three
times. The reset count returns to zero each time a call for
heat is successfully completed.
Some hydronic and forced air systems now require a
delayed valve-on and burner motor-off delay. The R7184
operates an oil valve that prevents the flow of oil when
the burner motor is running prior to combustion (delayed
valve-on) and when the burner motor is running after
combustion (burner motor-off delay).
To reset from restricted mode: Press and hold the reset
button for 30 seconds. When the LED flashes twice, the
device has reset.
The R7184 models are intended for use only on oil
burning appliances which do not require prepurge and
post-purge as a safety related function as defined in UL
296. The valve-on delay and burner motor-off delay in
this control are intended only to help establish draft and
reduce oil after-drip related problems.
SPECIFICATIONS
Models:
Table 1 lists the major features and the applicable wiring
diagram numbers for the R7184.
FEATURES
Timing:
Safe Start Check: 5 seconds (approximately).
Valve-on Delay: 15 seconds.
Burner motor-off Delay: 0, 2, 4, or 6 minutes, field-
selectable using DIP switch positions 1 and 2.
Limited Recycle
This feature limits the number of recycle trials (for each
call for heat) to a maximum of three trials. If the flame is
lost three times and does not successfully satisfy a call
for heat, the R7184 locks out.
NOTE: For universal R7184U model, valve-on delay
and burner motor-off delay timings can be
enabled (values as listed) or disabled (values
are zero) in the field using DIP switch position 3.
Pump Priming Cycle
To facilitate purging air from the oil lines and filters, the
R7184 can be placed in a purge routine by pressing and
releasing the reset button during the safety check,
delayed valve-on , ignition or carry-over periods. The
Lockout: 15, 30 or 45 seconds (factory-programmed).
Recycle: 60 seconds (fixed).
Ignition Carryover: 10 seconds (fixed).
® U.S. Registered Trademark
Copyright © 2000 Honeywell Inc. • All Rights Reserved
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69- 1233- 2
R7184A,B,P,U INTERRUPTED ELECTRONIC OIL PRIMARY
CHECKOUT
L8148A,C
THERMOSTAT
C1
AQUASTAT®
CONTROLLER
L1
L2
CIRCULATION
PUMP
C2
Start System
B2
B1
1
T
T
R
W
WARNING
R7184
LIMIT
L1
T
T
Fire Hazard.
Can cause serious injury or death.
Make sure combustion chamber is free of oil
and/or oil vapor before starting system.
L2
JUMPER
BURNER MOTOR
BURNER
MOTOR
INTERRUPTED
IGNITOR
IGNITOR
INTERRUPTED
INTERMITTENT
IGNITOR
VALVE
INTERMITTENT
VALVE
TO
REMOTE
ALARM
BURNER MOTOR
L1
CAD
CELL
CAD
CELL
ALARM
2
CIRCUIT
JUNCTION
BOX
L2
SCREW TERMINAL
LEGEND:
1/4 IN. QUICK CONNECT TERMINAL
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
M17182B
LIMIT
OPTIONAL FEATURE ON SELECT MODELS.
CAD CELL
VALVE
Fig. 3. Wiring for typical oil-fired boiler.
M16453A
L1
(HOT)
T8600
L2
1
Fig. 2. Wiring terminals.
1. Open hand valve in oil supply line.
2. Make sure system is powered. Check circuit
breaker or fuse and close system switch, if
provided.
3. Set thermostat to call for heat.
4. Make sure burner lights and operates until call for
heat ends.
COOLING
RC
G
FAN RELAY
CONTROL
Y
R7184
T
1
L1
HOT
R
L1
LIMIT
T
W
L2
L2
VALVE
3
BURNER
MOTOR
BURNER
MOTOR
Check Safety Features
Safe Start
1. Place a jumper across cad cell terminals.
2. Follow procedure to turn on burner. Burner must
not start, indicator light turns on and control
remains in Idle Mode.
INTERRUPTED
IGNITOR
IGNITOR
INTERMITTENT
TO
CAD
CELL
CAD
REMOTE
ALARM
CIRCUIT
CELL
ALARM
2
JUNCTION
BOX
Simulate flame failure:
1. Follow procedure to turn on burner.
2. Close hand valve in oil supply line.
3. Device enters recycle mode.
SCREW TERMINAL
LEGEND:
1/4 IN. QUICK CONNECT TERMINAL
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
4. Device tries to restart system after approximately
2
3
OPTIONAL FEATURE ON SELECT MODELS.
VALVE MAY BE ADDED AS SHOWN.
60 seconds.
5. Safety switch locks out approximately in safety
switch timing indicated on label. Indicator light
flashes at 1 Hz rate. Ignition and motor stop and oil
valve closes.
M17183B
Fig. 4. Typical wiring diagram for 24 Vac thermostat
and R7184 for an oil-fired forced air system.
3
69-1233—2
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R7184A,B,P,U INTERRUPTED ELECTRONIC OIL PRIMARY
R7184
R7184
JUMPER
T
T
LINE VOLTAGE
THERMOSTAT
OR AQUASTAT®
CONTROL
L1
1
L1
T
LIMIT
L1
HOT
L2
1
LINE VOLTAGE
THERMOSTAT
OR AQUASTAT®
CONTROL
LIMIT
LIMIT
T
L1
HOT
L2
JUMPER
L2
VALVE
L2
3
BURNER
MOTOR
BURNER
MOTOR
VALVE
OIL
VALVE
INTERRUPTED
IGNITOR
IGNITOR
BURNER
MOTOR
BURNER
MOTOR
INTERMITTENT
INTERRUPTED
IGNITOR
TO
REMOTE
ALARM
IGNITOR
CAD
CELL
CAD
ALARM
CELL
INTERMITTENT
2
CIRCUIT
TO
REMOTE
ALARM
CIRCUIT
JUNCTION
BOX
CAD
CELL
ALARM
CAD
CELL
2
SCREW TERMINAL
LEGEND:
1/4 IN. QUICK CONNECT TERMINAL
JUNCTION BOX
1/4 IN. QUICK CONNECT TERMINAL
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
SCREW TERMINAL
LEGEND:
OPTIONAL FEATURE ON SELECT MODELS.
VALVE MAY BE ADDED AS SHOWN.
2
3
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
M17184B
M17186A
OPTIONAL FEATURE ON SELECT MODELS.
Fig. 5. Typical wiring diagram for line voltage
Aquastat® thermostat and R7184 for an oil burner
system.
Fig. 7. Typical wiring diagram for line voltage
Aquastat® thermostat and R7184B,P,U for valve-on
delay/burner motor-off delay oil burner system.
Simulate ignition failure:
L1
(HOT)
T8600
1. Follow starting procedure to turn on burner, but do
not open oil supply hand valve.
L2
1
COOLING
CONTROL
RC
G
FAN RELAY
2. Observe that safety switch locks out approximately
within safety switch timing as indicated on the
label. Indicator light flashes at 1 Hz rate. Ignition
and motor stop and oil valve closes.
R7184
Y
L1
T
R
1
L1
HOT
L2
LIMIT
T
LIMIT
W
L2
OPERATION
The R7184 is a microprocessor-based control. The
indicator light provides diagnostic information for lockout,
recycling and patented cad cell status. There is a manual
reset button to exit the lockout mode and enter the idle
mode. Operation is shown in Table 4.
VALVE
OIL
VALVE
BURNER
MOTOR
BURNER
MOTOR
INTERRUPTED
IGNITOR
IGNITOR
INTERMITTENT
TROUBLESHOOTING AND
MAINTENANCE
TO
REMOTE
ALARM
CAD
CELL
CAD
ALARM
CELL
2
CIRCUIT
IMPORTANT:
JUNCTION
BOX
Due to the potential hazard of line voltage, only
a trained, experienced service technician
should perform the troubleshooting procedure.
SCREW TERMINAL
LEGEND:
1/4 IN. QUICK CONNECT TERMINAL
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
This control contains no field-serviceable parts.
Do not attempt to take it apart. Replace entire
control if operation is not as described.
M17185A
OPTIONAL FEATURE ON SELECT MODELS.
To completely troubleshoot an oil burner installation,
check the burner and oil primary control for proper
operation and condition.
Fig. 6. Typical wiring diagram for 24 Vac thermostat
and R7184 for valve-on delay/burner motor off oil
burner system.
The indicator light on the oil primary control provides
lockout, recycle and cad cell indications as follows:
69-1233—2
4
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R7184A,B,P,U INTERRUPTED ELECTRONIC OIL PRIMARY
1. Flashing at 1 Hz (1/2 second on, 1/2 second off):
system is locked out or in restricted mode.
2. Flashing at 1/4 Hz (2 seconds on, 2 seconds off):
control is in recycle mode.
3. On: cad cell is sensing flame.
4. Off: cad cell is not sensing flame.
VALVE ON DELAY TIME: 15 SEC. (FIXED)
DELAY TIMES:
BURNER MOTOR OFF DELAY TIME:
1
2
1
2
1
2
1
2
3
3
0 MIN.
2 MIN.
4 MIN.
6 MIN.
ENABLED DISABLED
M17535
(SHADED AREA IS SWITCH HANDLE POSITION)
Fig. 8. Switch settings for burner-off delay times.
Table 2. Switch Settings and Delays.
DIP Switch Settings
Delay Timings
Burner Motor-Off Delay
(minutes)
Valve-On
Delay
(seconds)
S-3 Enable/Disable
R7184U R7184P
R7184U
R7184P
S-1
S-2
0
0
0
2
4
6
—
X
X
Off
On
On
On
On
+
+
+
+
+
15
0.5
2
Off
Off
On
On
Off
On
Off
On
15
15
4
15
8
X = Don’t Care.
+ = S-3 not provided on R7184P models.
6. Check the piping to the oil tank.
7. Check the oil nozzle, oil supply and oil filter.
Cad Cell Resistance Check
For proper operation it is important that the cad cell
resistance is below 1600 ohms. During a normal call for
heat, once the control has entered the Run mode, press
and release the reset button. Indicator light will flash 1 to
4 flashes. See Table 3 for equivalent cad cell resistance.
Check Oil Primary Control
If the trouble is not in the burner or ignition hardware,
check the oil primary control by using the following
equipment:
Table 3. Cad cell resistance when sensing flame.
Flashes
Cad Cell Resistance in ohms
Less than 400
1. Screwdriver.
2. Voltmeter (0 to 150 Vac).
3. Insulated jumper wire with both ends stripped.
1
2
3
4
More than400 and less than 800
More than 800 and less than 1600
More than 1600 and less than 5000
WARNING
Electrical Shock Hazard.
Can cause serious injury or death.
Troubleshoot with the system powered. Be
careful to observe all precautions to prevent
electrical shock or equipment damage.
Preliminary Steps
1. Check wiring connections and power supply.
2. Make sure power is on to the controls.
3. Make sure limit control is closed.
4. Check contacts between ignitor and the
electrodes.
Refer to Table 4 for further troubleshooting
information.
5. Check the oil pump pressure.
5
69-1233—2
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R7184A,B,P,U INTERRUPTED ELECTRONIC OIL PRIMARY
Table 4. R7184 Operation.
External Action
R7184 Action
Power applied to control.
Internal safety check conducted. If no light or flame is detected and all internal
conditions are correct, control enters Idle mode.
®
1. Shorts across T-T terminals (on as call for heat) in warm air system and/or
provides power to limit terminals in hydronic system.
2. Safety Period (4 seconds) internal and external check for flame or light. If flame or
light is detected, control remains in Idle mode.
3. When flame or light is not present:
Thermostat or Aquastat
Control calls for heat.
a. R7184A,U (if valve-on delay is disabled) will apply power to the burner motor
and ignitor.
b. R7184B,P,U (if valve-on delay is enabled) will apply power to the burner motor
and ignitor, enter/complete valve-on delay period and then apply power to the
valve.
4. Control enters Trial for Ignition period.
a. Monitors burner for flame.
b. When flame is not detected:
(1) Enters lockout mode (after lockout time of 15, 30 or 45 seconds).
(2) Shuts off valve, ignitor and burner motor.
(3) Flashes indicator light at 1 Hz (1/2 second on, 1/2 second off).
(4) Depress reset button to return to power up sequence.
c. When flame is detected, Carry-Over period begins:
5. Control enters Ignition Carry-Over period (continues to spark for 10 to 30
seconds).
a. Turns on indicator light.
b. If flame is lost and lockout time has not expired, R7184 returns to Trial for
Ignition period.
c. If flame is lost and lockout time has expired, R7184 enters Recycle Mode.
6. Carry-Over time expires; ignitor turns off.
7. Enters Run Mode:
a. Flame is monitored until call for heat ends or flame is lost. If flame is lost:
(1) Control enters Recycle Mode.
(2) Recycle time starts (60 seconds).
(3) Burner and valve are turned off.
(4) Indicator light flashes at 1/4 Hz (2 seconds on, 2 seconds off).
(5) Returns to Idle mode at end of Recycle mode.
Call for heat is satisfied.
1. R7184A,U (if burner motor-off delay is disabled):
a. Burner motor and oil valve shut off.
b. Indicator light turns off.
2. R7184B,P,U (if burner motor-off delay is enabled):
a. Oil valve shuts off.
b. Burner motor runs for selected burner motor-off delay.
c. Burner motor turns off.
d. Device returns to Idle mode.
Reset button pushed two
times without device
completing a call for heat.
1. R7184 enters Restricted mode.
2. Indicator light flashes at 1Hz (1/2 second on, 1/2 second off).
3. Reset device by pressing and holding reset button for a minimum of 30 seconds.
Table 5. Troubleshooting Information .
Procedure
Status
Corrective Actions
Condition: Burner does not start with a call for heat.
1. Check that limit switches are closed
and contacts are clean.
—
—
—
—
2. Check for line voltage power at the oil
primary control. Voltage should be 120
Vac.
3. Check indicator light with burner off, Indicator light is on.
no call for heat (no flame).
Cad cell or controller is defective, sees external light
or connections are shorted. Go to step 4.
Indicator light is off.
Go to step 5.
69-1233—2
6
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R7184A,B,P,U INTERRUPTED ELECTRONIC OIL PRIMARY
Table 5. Troubleshooting Information (Continued).
Procedure
Status
Corrective Actions
4. Shield cad cell from external light.
Indicator light turns
off.
Eliminate external light source or permanently shield
cad cell.
Indicator light stays
on.
•
•
Replace cad cell with new cad cell and recheck.
If indicator light does not turn off, remove cad cell
leadwires from R7184 and recheck.
If indicator light turns off, replace cad cell bracket
assembly. Refer to TRADELINE® Catalog for
bracket part numbers.
•
•
If indicator light does not turn off, replace
controller.
5. On warm air systems, jumper
thermostat (T to T) terminals on R7184.
(On hydronic systems jumper Limit
terminal and L1 of R7184.)
Burner starts.
Trouble in thermostat or limit circuit. Check
thermostat or limit wiring connections.
Burner does not start.
•
Disconnect line voltage power and open line
switch.
•
•
•
Check all wiring connections.
Tighten any loose connections and recheck.
If burner does not start, replace R7184.
IMPORTANT:
First remove one thermostat
lead.
Condition: Burner starts, then locks out on safety with indicator light flashing at 1 Hz rate (1/2 second on, 1/2
second off).
1. Check that limit switches are closed
and contacts are clean.
–
–
–
–
2. Check for line voltage power at the
oil primary control. Voltage should be
120 Vac.
3. Check indicator light with burner off, Indicator light is on.
no call for heat (no flame).
Cad cell or controller is defective, sees external light
or connections are shorted. Go to step 4.
Indicator light is off.
Go to step 5.
4. Shield cad cell from external light.
Indicator light turns
off.
Eliminate external light source or permanently shield
cad cell.
Indicator light stays
on.
•
Replace cad cell with new cad cell and
recheck.
•
If indicator light does not turn off, remove cad
cell leadwires from R7184 and recheck.
•
If indicator light turns off, replace cad cell
®
bracket assembly. Refer to TRADELINE
catalog for bracket part numbers.
•
If indicator light does not turn off, replace
controller.
5. On warm air systems, jumper
thermostat (T to T) terminals on R7184.
(On hydronic systems, jumper Limit
terminal and L1 of R7184.)
Burner starts.
Trouble is in thermostat or limit circuit. Check
thermostat or limit wiring connections.
IMPORTANT:
First remove one thermostat lead.
Burner does not start.
•
Disconnect line voltage power and open line
switch.
•
•
•
Check all wiring connections.
Tighten any loose connections and recheck.
If burner does not start, replace R7184.
Condition: Burner starts then locks out on safety with indicator light flashing at 1 Hz rate (1/2 second on, 1/2
second off)
6. Reset oil primary control by pushing Indicator light stops
Go to step 7.
in and releasing red reset button.
flashing.
Indicator light
Verify that control is not in restricted mode (see
continues to flash at footnote a). If not in restricted mode, replace R7184.
a
1 Hz rate .
7
69-1233—2
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R7184A,B,P,U INTERRUPTED ELECTRONIC OIL PRIMARY
Table 5. Troubleshooting Information (Continued).
Procedure
Status
Corrective Actions
7. Listen for spark after burner turns on Ignition is off.
(after a 2 second delay.
Spark ignitor could be defective. Check for line
voltage at ignitor terminals. If line voltage is present,
replace R7184.
Ignition is on.
Go to step 8.
Ignition is on, but no Wait for Valve On Delay to complete (R7184B,P, and
oil is being sprayed U). Check oil valve, oil valve wiring, pump and oil
into the combustion
chamber.
supply.
8. Check indicator light after flame is
established, but before oil primary
control locks out.
Indicator light is on
until the control locks
out and starts flashing
during lockout.
Replace R7184.
Indicator light stays
off.
Go to step 9.
Go to step 10.
9. Check cad cell sighting for view of
flame.
Burner locks out.
Burner keeps running. System is okay.
•
•
Disconnect line voltage power and
open line switch.
Unplug cad cell and clean cad cell
face with soft cloth. Check sighting
for clear view of flame. Place cad cell
back in socket.
•
•
Reconnect line voltage power and
close line switch.
Start burner.
10. Check cad cell.
Indicator light is on.
Indicator light is off.
Place control back on burner. Go to step 6.
•
•
•
Disconnect line voltage power and
open line switch.
Remove existing cad cell and replace
with new cad cell.
Disconnect all wires from thermostat
terminals to be sure there is no call
for heat.
Go to step 11.
•
•
Reconnect line voltage power and
close line switch.
Expose new cad cell to bright light,
such as a flashlight.
11. Check cad cell bracket assembly.
Indicator light is on.
Replace cad cell bracket assembly. Refer to
•
Disconnect line voltage power and
open line switch.
TRADELINE® Catalog for bracket part numbers.
•
Remove cad cell wires from quick-
connect connectors on the R7184
and leave control leadwires open.
Apply power to device.
Place jumper across cad cell
terminals after burner motor turns on.
•
•
Indicator light is off.
Replace R7184.
Home and Building Control
Honeywell Inc.
Honeywell Plaza
Home and Building Control
Honeywell Limited-Honeywell Limitée
155 Gordon Baker Road
North York, Ontario
P.O. Box 524
Minneapolis, MN 55408-0524
M2H 3N7
Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.
69-1233—2 G.R. Rev. 5-00
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