Honeywell R7284B, R7284P, R7284U, R7284G Installation Manual
69-2467-01
R7284B,P,U,G
Electronic Oil Primary,
EnviraCOM™ Enabled
INSTALLATION INSTRUCTIONS
APPLICATION
The R7284B,P,U,G Electronic Oil Primary is a line
voltage, safety rated, interrupted and intermittent ignition
oil primary control for residential oil fired burners used in
boilers, forced air furnaces and water heaters. The
R7284B,P,U,G used with a cad cell flame sensor
operates an oil burner, spark igniter, and optional oil
valve. The control works with a low voltage and optional
high voltage thermostat. The primary controls fuel oil,
senses flame, controls ignition spark (either interrupted
or intermittent) and notifies through the EnviraCOM™
bus a remote alarm circuit when in lockout.
The R7284 Series of Oil Primary Controls 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 require a delayed
valve-on and burner motor-off delay. The R7284
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 R7284 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
UL296. 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.
EnviraCOM™ enabled R7284’s can be used with
EnviraLink® remote monitoring systems and hand-held
diagnostics. Use only R7284P and U models for
networking with other EnviraCOM™ enabled devices.
FEATURES
The advanced interface has a two-line display used to
configure device parameters, retrieve diagnostic
information, and display system status.
The basic interface has a single LED used to display
error codes and system status.
In general, the “i” button cycles through the display
options and acts as an “enter” key (in setup modes).
Thermostat(s)
The oil primaries are compatible with both standard
thermostats and EnviraCOM™ communicating
thermostats.
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 R7284 locks out.
Pump Priming Cycle
To facilitate purging air from the oil lines and filters, the
R7284 can be placed in a purge routine by pressing and
releasing the up arrow button during the Trial For
Ignition.
In the advanced interface “PUMP PRIME” is displayed
on the display along with the time left on the Trial for
Ignition (TFI). Pressing the up arrow button adds a
minute to the TFI time for a maximum of 10 additional
minutes (press the up arrow button 10 times). Pressing
the down arrow button subtracts a minute from the TFI
time.
There is no visual indication for the basic interface
control and the purge timing is limited to five minutes.
Disable Function
Pressing and holding the “i” button will disable all control
functions until 3 seconds after the button is released.
User Interface
There are two user interfaces: basic and advanced. Both
interfaces consist of three buttons: , , and “i.”
Lockout Modes
The R7284 has three types of lockout modes that are
entered when an error is encountered:
R7284B,P,U,G ELECTRONIC OIL PRIMARY, ENVIRACOM™ ENABLED
WARNING
• Soft Lockout: Caused by a temporary internal error
such as low voltage. The control recovers
automatically after the error is no longer detected.
• Hard Lockout: Caused by a failure internal to the
control or by a system fault such as flame out of
sequence. A Hard Lockout will result in a no heat
condition. To reset from Hard Lockout press and hold
the “i” button for 2 seconds.
• Restricted Lockout: Caused by a number of
consecutive hard lockouts on the same heat cycle. To
reset from a Restricted Lockout press and hold the “i”
button for ten seconds.
Cad Cell Resistance
Cad cell resistance can be checked without using an ohm
meter.
Basic Interface:
Press and release the “i” button. The resulting flashes
indicate the resistance. See Table 3.
Advanced Interface:
The cad cell resistance is shown on the display.
Valve-on Delays/Blower Motor-off Delays
Select models may have fixed or adjustable delays for
valve open or blower motor off. The safety circuits will
check for flame during these delays and, if a flame is
present, will switch the control to lockout.
SPECIFICATIONS
Models:
Table 1 lists the major features for the R7284.
Timing :
Valve-on Delay: 0–30 seconds
Burner Off Delay: 0–8 minutes
Lockout: 15, 30 or 45 seconds.
Recycle: 60 seconds (fixed).
Ignition Carryover: 10 seconds (fixed).
Table 1. R7284 Models.
Model Limit Valve Notes
R7284B No Yes Valve on delay only
R7284G No No No on/off delays, intermittent ignition (wire igniter together with motor)
R7284P Yes Yes On and off delays
R7284U Yes Yes On and off delays
NOTE: Some models have adjustable Valve-on Delay,
Burner Off Delay, and Lockout timings.
Electrical Ratings:
Inputs:
Voltage: 102 to 132 Vac, 120 Vac nominal.
Current: 0.5A plus burner motor, valve and igniter
loads.
Frequency: 60 Hz.
Outputs:
Relay Contacts:
Burner: 120 Vac, 10 full load amperes (FLA), 60 locked
rotor amperes (LRA).
Valve: 120 Vac, 1A.
Igniter: 120 Vac, 3 A.
Low Voltage Shutdown: 80 Vac
Thermostat Current Available: 100 mA.
EnviraCOM™ Current Available: 150 mA.
NOTE: Reduce burner FLA rating by igniter load. For
example, if the igniter draws 3A (120 Vac, 360
VA), reduce the burner motor FLA to 7A.
Typical Component Wire Color Code:
White: Neutral.
Black: Line.
Orange: Motor.
Blue or Blue w/White Stripe: Igniter.
Violet: Valve.
Red: Limit.
NOTE: The R7284 is provided with 1/4” quick-connect
terminals.
Environmental Ratings:
Operating/Shipping Temperature: -40°F to +150°F
(-40°C to +66°C).
Display text may not be visible below -4°F (-20°C)
Humidity: 0% to 95% relative humidity at 104°F (40°C),
noncondensing.
Accessories:
W8735S3000 Alarm Module
Approvals:
Underwriters Laboratories Inc.: Recognized (File MP268).
Canadian Underwriters Laboratories Inc.
INSTALLATION
When Installing This Product…
1. Read these instructions carefully. Failure to follow
instructions can damage the product or cause a
hazardous condition.
2. Check ratings given in these instructions and on the
product to make sure the product is suitable for your
application.
3. Make sure the installer is a trained, experienced
service technician.
4. Use these instructions to check out the product
operation after installation.
69-2467—01 2
Electrical Shock Hazard.
Can cause severe injury, death or property
damage.
Disconnect power supply before beginning
installation to prevent electrical shock or
equipment damage. More than one disconnect
may be involved.
R7284B,P,U,G ELECTRONIC OIL PRIMARY, ENVIRACOM™ ENABLED
WARNING
WARNING
Location
1. 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).
2. Before mounting the control, make line voltage connections as shown in Fig. 2 through 10. Splice lines
with solderless connectors. Do not exceed load ratings shown on the device label.
3. If necessary, use the control as a template to mark
and drill new mounting holes.
4. Mount the device using No. 6 screws (not included).
WIRING
Electrical Shock Hazard.
Can cause severe injury, death or property
damage.
Disconnect power supply before beginning wiring
to prevent electrical shock or equipment damage.
More than one disconnect may be involved.
1. Make sure wiring complies with all local codes and
ordinances.
2. Check to make sure that line voltage wiring is
properly connected. Refer to oil primary label and
appliance wiring diagram for color codes.
3. After mounting make low voltage connections to the
screw terminals (see Fig. 2 through 10).
4. Strip leads 3/8 in. (10 mm) and insert under terminal
screw.
5. Connect thermostat leads to T-T (or 1, 2, 3 if
EnviraCOM™ is present), if required by installation.
R7284
CHECKOUT
Start System
Fire or Explosion Hazard.
Can cause severe injury, death or property
damage.
Make sure the combustion chamber is free of oil
and/or oil vapor before starting system.
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. Note cad cell resistance while running.
5. Verify that burner turns off when thermostat call for
heat is satisfied.
DISPLAY
THERMOSTAT
TERMINALS
ENVIRACOM
TERMINALS
DISPLAY
THERMOSTAT
TERMINALS
ENVIRACOM
TERMINALS
Fig. 2. R7284 terminals, connectors, LED, reset button
and DIP switch locations.
UP BUTTON
DOWN
BUTTON
i BUTTON
ENVIRACOM
DIAGNOSTIC
PLUG
UP BUTTON
DOWN
BUTTON
i BUTTON
ENVIRACOM
DIAGNOSTIC
PLUG
M32146
Fig. 1. Mounting R7284 on junction box.
BURNER
M32085
CAD CELL CONNECTION
LINE VOLTAGE CONNECTIONS
M32178
Fig. 3. R7284 wiring connections.
3 69-2467—01
R7284B,P,U,G ELECTRONIC OIL PRIMARY, ENVIRACOM™ ENABLED
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
REFER TO DEVICE LABEL FOR WIRE COLOR CODE.
ENVIRACOM™ TERMINAL 3 IS ALSO THE FIRST THERMOSTAT TERMINAL.
THE JUMPER MAY BE OMITTED IF THE R7284 IS CONFIGURED TO IGNORE
THE TT TERMINALS.
1
R7284
IGNITER
M32191
L1
1
CAD
CELL
2
3
4
3
4
2
2
2
BURNER
MOTOR
CIRCULATION
PUMP
L2
B2
C2
C1
BURNER
MOTOR
IGNITER
VALVE
CAD
CELL
L1
B1
LIMIT
JUNCTION
BOX
T
T
3
2
1
T
T
LEGEND:
SCREW TERMINAL
1/4 IN. QUICK CONNECT TERMINAL
SOLDERLESS WIRE CONNECTOR
THERMOSTAT
L8148A,C
JUMPER
AQUASTAT®
CONTROLLER
R
W
ENVIRACOM™
TERMINAL
L1
L2
R7284P, U
LIMIT
L1
R7284B, P, U
VALVE
BURNER
MOTOR
AQUASTAT
OR OTHER
LIMIT
……
VALVE
BURNER
MOTOR
……
R7284B, G
……
AQUASTAT
L1
OR OTHER
LIMIT
Fig. 4. R7284 Limit wiring for line voltage thermostat,
R7284A, G
BURNER
MOTOR
Aquastat, or other Limit.
……
VALVE
BURNER
MOTOR
Fig. 5. R7284 wiring for optional oil valve.
L2
R7284B, P, U
……
BURNER
MOTOR
IGNITER
INTERRUPTED IGNITION
INTERMITTENT IGNITION
BURNER
MOTOR
IGNITER
R7284G
BURNER
MOTOR
……
BURNER
MOTOR
IGNITER
INTERMITTENT
IGNITION
Fig. 6. R7284 igniter wiring.
C1
CIRCULATION
R
W
THERMOSTAT
5
JUMPER
ENVIRACOM™
TERMINAL
LEGEND:
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
REFER TO DEVICE LABEL FOR WIRE COLOR CODE.
2
VALVE IS OPTIONAL ON SPECIFIC MODELS.
3
4
ENVIRACOM™ TERMINAL 3 IS ALSO THE FIRST THERMOSTAT TERMINAL.
5
THE JUMPER MAY BE OMITTED IF THE R7284 IS CONFIGURED TO IGNORE
THE TT TERMINALS.
Fig. 7. Wiring R7284P,U without EnviraCOM™, for
69-2467—01 4
PUMP
R7284
LIMIT
T
L1
T
3
L2
2
4
1
SCREW TERMINAL
SOLDERLESS WIRE CONNECTOR
BURNER
MOTOR
IGNITER
VALVE
CAD
CELL
typical oil-fired boiler.
AQUASTAT®
CONTROLLER
C2
2
2
2
JUNCTION
BOX
1/4 IN. QUICK CONNECT TERMINAL
T
T
CAD
CELL
L8148A,C
BURNER
MOTOR
IGNITER
VALVE
B2
B1
L1
M32179
L2
M32180
L2
M32181
L1
L2
1
3
M32182
Fig. 8. Wiring R7284U without EnviraCOM™, for
typical oil-fired boiler.
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