Honeywell R7184B Users Manual 69 1233

R7184A to the manual 2866d236-6d84-429c-a2bb-54e56dceea08

2015-01-23

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R7184A,B,P,U
Interrupted Electronic Oil Primary
INSTALLATION INSTRUCTIONS

APPLICATION
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.
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.
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).
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.

FEATURES
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.

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

® U.S. Registered Trademark
Copyright © 2000 Honeywell Inc. • All Rights Reserved

lockout timing will be extended to 4 minutes and the
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.

Disable Function
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.
To reset from restricted mode: Press and hold the reset
button for 30 seconds. When the LED flashes twice, the
device has reset.

SPECIFICATIONS
Models:
Table 1 lists the major features and the applicable wiring
diagram numbers for the R7184.
Timing:
Safe Start Check: 5 seconds (approximately).
Valve-on Delay: 15 seconds.
Burner motor-off Delay: 0, 2, 4, or 6 minutes, fieldselectable using DIP switch positions 1 and 2.
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.
Lockout: 15, 30 or 45 seconds (factory-programmed).
Recycle: 60 seconds (fixed).
Ignition Carryover: 10 seconds (fixed).

69- 1233- 2

R7184A,B,P,U INTERRUPTED ELECTRONIC OIL PRIMARY
NOTE: Reduce burner FLA rating by Ignitor load. For
example, if the ignitor draws 3A (120 Vac, 360
VA), reduce the burner motor FLA to 7A.

Electrical Ratings:
Inputs:
Voltage: 102 to 132 Vac, 120 Vac nominal.
Current: 100 mA plus burner motor, valve and ignitor
loads.
Frequency: 60 Hz.
Outputs:
Relay Contacts:
Burner: 120 Vac, 10 full load amperes (FLA),
60 locked rotor amperes (LRA).
Valve: 120 Vac, 1A.
Ignitor: 120 Vac, 360 VA.
Alarm: 30 Vac, 2A.
Thermostat Current Available: 100 mA.

Environmental Ratings:
Operating Ambient Temperature: -40°F (-40°C) to
+147°F (+64°C).
Shipping Temperature: -20°F (-29°C) to +150°F (+66°C).
Humidity: 90% relative humidity at 95°F (93°C)
noncondensing.
Approvals:
Underwriters Laboratories Inc.: Recognized.
Canadian Underwriters Laboratories Inc.

Table 1. R7184 Models.
Model

Valve-on delay
(sec)

Burner motor-off
delay (min)

Alarm
Contacts

Typical Wiring Diagram
Fig. Reference No.

Thermostat
Terminals T-T

R7184A

None

3,4,5

Yes

R7184B

None

3,6,7

Yesc

R7184Pa

0/2/4/6b

Optional

3,6,7

Yes

R7184U

Selectable 0 or 15 Selectable 0 or
0,2,4,6b

Yes

3,6,7

Yes

aSome

select models may have a delay enable/disable switch.
timings. Other timing may be available on select models.
cSelect models are provided with a T-T jumper which can be disabled by cutting with a pair of side-cutting pliers.
bStandard

INSTALLATION
When Installing this Product...
1.
2.
3.
4.

S7184

Read these instructions carefully. Failure to follow
instructions can damage product or cause a
hazardous condition.
Check ratings given in these instructions and on
product to make sure product is suitable for your
application.
Make sure installer is a trained, experienced
service technician.
Use these instructions to check out product
operation after installation.

R7184

BURNER

WARNING
Electrical Shock Hazard.
Can cause serious injury or death.
Disconnect power supply before beginning
installation to prevent electrical shock or
equipment damage.

Location
1.

3.
4.

Mount on a 4 in. by 4 in. junction box, directly on
the main burner or inside the appliance cabinet. In
replacement applications, mount in the same
location as the old control. See Fig. 1. Make sure
the operating temperatures are within the ambient
temperature range (see Specifications section).
Before mounting the control, make line voltage
connections as shown in Fig. 2 through 7. Splice
lines with solderless connectors. Do not exceed
load ratings shown on the device label.
If necessary, use the control as a template to mark
and drill new mounting holes.
Mount using No. 6 screws (obtained locally).

69-1233—2

M17180A

Fig. 1. Mounting R7184 on junction box.

WIRING
1.
2.
3.
4.

Make sure wiring complies with all local codes and
ordinances.
After mounting, make low voltage connections to
the screw terminals (see Fig. 2 through 7).
Strip leads 3/8 in. (10 mm) and insert under
terminal screw. See Fig. 1.
Connect thermostat leads to T-T.

Switch Settings
Figure 8 and Table 2 provide the switch settings for the
R7184U.

R7184A,B,P,U INTERRUPTED ELECTRONIC OIL PRIMARY

CHECKOUT
L8148A,C

THERMOSTAT

C1
CIRCULATION
PUMP

Start System

AQUASTAT®
CONTROLLER

L1
L2

WARNING

W
R7184
LIMIT

Fire Hazard.
Can cause serious injury or death.
Make sure combustion chamber is free of oil
and/or oil vapor before starting system.

T
L2

JUMPER

BURNER MOTOR

BURNER
MOTOR

INTERRUPTED
IGNITOR

T
T

IGNITOR

INTERMITTENT

VALVE

VALVE
TO
REMOTE
ALARM
2
CIRCUIT

BURNER MOTOR
L1

CAD
CELL

ALARM

JUNCTION
BOX

LIMIT

LEGEND:

CAD CELL

SCREW TERMINAL

1/4 IN. QUICK CONNECT TERMINAL

POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.

OPTIONAL FEATURE ON SELECT MODELS.

M17182B

VALVE

Fig. 3. Wiring for typical oil-fired boiler.

M16453A

1.
2.
3.
4.

FAN RELAY

R7184
T

LIMIT

L2
VALVE

BURNER
MOTOR

Safe Start

IGNITOR

TO
REMOTE
ALARM
2
CIRCUIT

ALARM

CAD
CELL

JUNCTION
BOX

Simulate flame failure:

INTERMITTENT

Place a jumper across cad cell terminals.
Follow procedure to turn on burner. Burner must
not start, indicator light turns on and control
remains in Idle Mode.

Follow procedure to turn on burner.
Close hand valve in oil supply line.
Device enters recycle mode.
Device tries to restart system after approximately
60 seconds.
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.

1
L1
HOT
L2

BURNER
MOTOR

INTERRUPTED

1.
2.
3.
4.

COOLING
CONTROL

Open hand valve in oil supply line.
Make sure system is powered. Check circuit
breaker or fuse and close system switch, if
provided.
Set thermostat to call for heat.
Make sure burner lights and operates until call for
heat ends.

Check Safety Features
1.
2.

L1
(HOT)
L2
1

T8600

Fig. 2. Wiring terminals.

LEGEND:

SCREW TERMINAL

1/4 IN. QUICK CONNECT TERMINAL

POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.

OPTIONAL FEATURE ON SELECT MODELS.

VALVE MAY BE ADDED AS SHOWN.

M17183B

Fig. 4. Typical wiring diagram for 24 Vac thermostat
and R7184 for an oil-fired forced air system.

69-1233—2

R7184A,B,P,U INTERRUPTED ELECTRONIC OIL PRIMARY

JUMPER

R7184

LINE VOLTAGE
THERMOSTAT
OR AQUASTAT®
CONTROL

T
L2

VALVE

BURNER
MOTOR

1
LIMIT

LINE VOLTAGE
THERMOSTAT
OR AQUASTAT®
CONTROL

LIMIT

T
JUMPER

BURNER
MOTOR

INTERRUPTED

L1
HOT
L2

VALVE

IGNITOR

OIL
VALVE

BURNER
MOTOR

INTERRUPTED
INTERMITTENT
TO
REMOTE
ALARM
2
CIRCUIT

JUNCTION
BOX
LEGEND:
1

SCREW TERMINAL

1/4 IN. QUICK CONNECT TERMINAL

OPTIONAL FEATURE ON SELECT MODELS.

VALVE MAY BE ADDED AS SHOWN.

LEGEND:

L1
(HOT)
L2
1

T8600
FAN RELAY

COOLING
CONTROL

LIMIT

VALVE

BURNER
MOTOR
INTERRUPTED

1
L1
HOT
L2

BURNER
MOTOR

CAD
CELL

SCREW TERMINAL

M17186A

1.
2.

Follow starting procedure to turn on burner, but do
not open oil supply hand valve.
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.

OPERATION

TROUBLESHOOTING AND
MAINTENANCE

CAD
CELL
JUNCTION
BOX

LEGEND:

OPTIONAL FEATURE ON SELECT MODELS.

IGNITOR

ALARM

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.

OIL
VALVE

INTERMITTENT
TO
REMOTE
ALARM
2
CIRCUIT

1/4 IN. QUICK CONNECT TERMINAL

POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.

Simulate ignition failure:

R7184
L1
T

SCREW TERMINAL

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.

CAD
CELL

1
M17184B

Fig. 5. Typical wiring diagram for line voltage
Aquastat® thermostat and R7184 for an oil burner
system.

ALARM

JUNCTION BOX

POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.

IGNITOR

CAD
CELL

ALARM

1/4 IN. QUICK CONNECT TERMINAL

POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.

OPTIONAL FEATURE ON SELECT MODELS.

IMPORTANT:
Due to the potential hazard of line voltage, only
a trained, experienced service technician
should perform the troubleshooting procedure.
This control contains no field-serviceable parts.
Do not attempt to take it apart. Replace entire
control if operation is not as described.

M17185A

Fig. 6. Typical wiring diagram for 24 Vac thermostat
and R7184 for valve-on delay/burner motor off oil
burner system.

To completely troubleshoot an oil burner installation,
check the burner and oil primary control for proper
operation and condition.
The indicator light on the oil primary control provides
lockout, recycle and cad cell indications as follows:

69-1233—2

L1
HOT

IGNITOR

INTERMITTENT
TO
REMOTE
ALARM
2
CIRCUIT

1
LIMIT

R7184A,B,P,U INTERRUPTED ELECTRONIC OIL PRIMARY
Flashing at 1 Hz (1/2 second on, 1/2 second off):
system is locked out or in restricted mode.
Flashing at 1/4 Hz (2 seconds on, 2 seconds off):
control is in recycle mode.

1.
2.

3.
4.

On: cad cell is sensing flame.
Off: cad cell is not sensing flame.

VALVE ON DELAY TIME: 15 SEC. (FIXED)
DELAY TIMES:

0 MIN.

BURNER MOTOR OFF DELAY TIME:

4 MIN.

2 MIN.

6 MIN.

ENABLED DISABLED

(SHADED AREA IS SWITCH HANDLE POSITION)

M17535

Fig. 8. Switch settings for burner-off delay times.
Table 2. Switch Settings and Delays.
Delay Timings
Valve-On
Delay
(seconds)
0

DIP Switch Settings

Burner Motor-Off Delay
(minutes)
S-3 Enable/Disable
R7184U
0

R7184P
—

S-1
X

S-2
X

R7184U
Off

R7184P
+

0.5

Off

X = Don’t Care.
+ = S-3 not provided on R7184P models.

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.
Table 3. Cad cell resistance when sensing flame.
Flashes
1

6.
7.

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:
1.
2.
3.

Cad Cell Resistance in ohms
Less than 400

More than400 and less than 800

More than 800 and less than 1600

More than 1600 and less than 5000

Check wiring connections and power supply.
Make sure power is on to the controls.
Make sure limit control is closed.
Check contacts between ignitor and the
electrodes.
Check the oil pump pressure.

Screwdriver.
Voltmeter (0 to 150 Vac).
Insulated jumper wire with both ends stripped.

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.
2.
3.
4.

Check the piping to the oil tank.
Check the oil nozzle, oil supply and oil filter.

Refer to Table 4 for further troubleshooting
information.

69-1233—2

R7184A,B,P,U INTERRUPTED ELECTRONIC OIL PRIMARY
Table 4. R7184 Operation.
External Action
Power applied to control.
Thermostat or Aquastat®
Control calls for heat.

R7184 Action
Internal safety check conducted. If no light or flame is detected and all internal
conditions are correct, control enters Idle mode.
1.
2.
3.

6.
7.

Call for heat is satisfied.

1.
2.

Reset button pushed two
times without device
completing a call for heat.

1.
2.
3.

Shorts across T-T terminals (on as call for heat) in warm air system and/or
provides power to limit terminals in hydronic system.
Safety Period (4 seconds) internal and external check for flame or light. If flame or
light is detected, control remains in Idle mode.
When flame or light is not present:
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.
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:
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.
Carry-Over time expires; ignitor turns off.
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.
R7184A,U (if burner motor-off delay is disabled):
a. Burner motor and oil valve shut off.
b. Indicator light turns off.
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.
R7184 enters Restricted mode.
Indicator light flashes at 1Hz (1/2 second on, 1/2 second off).
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,
no call for heat (no flame).

Indicator light is on.

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

R7184A,B,P,U INTERRUPTED ELECTRONIC OIL PRIMARY
Table 5. Troubleshooting Information (Continued).
Procedure
4. Shield cad cell from external light.

Status

Corrective Actions

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.

Burner starts.
Trouble in thermostat or limit circuit. Check
5. On warm air systems, jumper
thermostat or limit wiring connections.
thermostat (T to T) terminals on R7184.
(On hydronic systems jumper Limit
Burner does not start. • Disconnect line voltage power and open line
terminal and L1 of R7184.)
switch.
• Check all wiring connections.
IMPORTANT:
• Tighten any loose connections and recheck.
First remove one thermostat
• If burner does not start, replace R7184.
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).
4. Shield cad cell from external light.

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.

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.

Burner starts.
5. On warm air systems, jumper
thermostat (T to T) terminals on R7184.
(On hydronic systems, jumper Limit
terminal and L1 of R7184.)
IMPORTANT:
First remove one thermostat lead.

Trouble is 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.
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
in and releasing red reset button.

Indicator light stops
flashing.

Go to step 7.

Indicator light
continues to flash at
1 Hz ratea.

Verify that control is not in restricted mode (see
footnote a). If not in restricted mode, replace R7184.

69-1233—2

R7184A,B,P,U INTERRUPTED ELECTRONIC OIL PRIMARY
Table 5. Troubleshooting Information (Continued).
Procedure

Status

7. Listen for spark after burner turns on Ignition is off.
(after a 2 second delay.

Corrective Actions
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
oil is being sprayed
into the combustion
chamber.

Wait for Valve On Delay to complete (R7184B,P, and
U). Check oil valve, oil valve wiring, pump and oil
supply.

Replace R7184.
Indicator light is on
until the control locks
out and starts flashing
during lockout.

8. Check indicator light after flame is
established, but before oil primary
control locks out.

9. Check cad cell sighting for view of
flame.

Indicator light stays
off.

Go to step 9.

Burner locks out.

Go to step 10.

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.
Indicator light is on.
10. Check cad cell.
• Disconnect line voltage power and
Indicator light is off.
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.
• Reconnect line voltage power and
close line switch.
• Expose new cad cell to bright light,
such as a flashlight.
Indicator light is on.
11. Check cad cell bracket assembly.
• Disconnect line voltage power and
open line switch.
• Remove cad cell wires from quickconnect 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.

Home and Building Control
Honeywell Inc.
Honeywell Plaza
P.O. Box 524
Minneapolis, MN 55408-0524
69-1233—2

G.R. Rev. 5-00

Place control back on burner. Go to step 6.
Go to step 11.

Replace cad cell bracket assembly. Refer to
TRADELINE® Catalog for bracket part numbers.

Replace R7184.

Home and Building Control
Honeywell Limited-Honeywell Limitée
155 Gordon Baker Road
North York, Ontario
M2H 3N7
Printed in U.S.A. on recycled
paper containing at least 10%
post-consumer paper fibers.

www.honeywell.com

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Honeywell R7184B Users Manual 69 1233

R7184A to the manual 2866d236-6d84-429c-a2bb-54e56dceea08

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