20
KNA Burner Manual 9.801-300.0 rev. 8/13
Honeywell
R7284U Electronic Oil Primary
Application
The R7284U Electronic Oil Primary is a line voltage,
safety rated, interrupted and intermittent ignition oil
primary control for oil fired burners.
The R7284U used with a cad cell flame sensor operates
the oil burner, spark igniter and oil valve.
Features
User Interface
There are two user interfaces: basic and advanced.
Both interfaces consist of three buttons: s, t and "i".
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 set-up modes).
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.
Disable Function
Pressing and holding the "i" button will disable all
control functions until 3 seconds after the button is
released.
Lockout Modes
The R7284 has three types of lockout modes that are
entered when an error is encountered.
Disable Function
Pressing and holding the "i" button will disable all
control functions until 3 seconds after the button is
released.
Lockout Modes
The R7284 has three types of lockout modes that are
entered when an error is encountered.
• 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 a Hard Lockout, press and
hold the "i" button for 2 seconds.
• Restricted Lockout: Caused by a number of con-
secutive 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 6.
Advanced Interface:
The cad cell resistance is shown on the display.
Specifications
Timing:
Valve-on Delay: 0-30 seconds
Burner Off Delay: 0-8 seconds
Lockout: 15, 30 or 45 seconds
Recycle: 60 seconds (fixed)
Ignition Carryover: 10 seconds (fixed)
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, 3A
Low Voltage Shutdown: 80 Vac
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.
Section: Honeywell Electronic Oil Primary
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