Honeywell R7284U User Manual

INSTALLATION INSTRUCTIONS
69-2467EFS-09
R7284B,P,U,G
Electronic Oil Primary,
EnviraCOM™ Enabled
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
User Interface
There are two user interfaces: basic and advanced.
Both interfaces consist of three buttons: , , 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 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.

Honeywell R7284U Specifications

General

Type	Oil Primary Control
Frequency	60 Hz
Enclosure	NEMA 1
Switch Action	SPDT
Material	Plastic
Ignition Type	Intermittent
Recycle	Limited Recycle
Mounting	Surface mount
Lockout Timing	60 seconds

Summary

Application Overview

Limited Recycle Feature

Limits recycle trials per call for heat, locking out after three losses.

Pump Priming Cycle Operation

Lockout Modes

Soft Lockout Mode

Temporary internal error recovery, automatically recovers when error clears.

Hard Lockout Mode

System fault or internal control failure causing a no-heat condition.

Restricted Lockout Mode

Caused by consecutive hard lockouts; requires a longer reset.

Valve and Blower Delay Specifications

Valve-on and Blower Motor-off Delays

Product Specifications

Electrical Ratings and Outputs

Details input voltage, current, frequency, and output relay contacts.

Wiring Instructions

Wiring Instructions and Safety

Provides wiring instructions and electrical shock hazard warnings.

System Checkout Procedures

System Startup and Checkout

Steps to safely start and verify system operation after installation.

R7284 Terminals and Connectors

R7284 Wiring Diagram

EnviraCOM Wiring Diagrams

Boiler Wiring Diagram (With EnviraCOM)

EnviraCOM Bus Wiring Precautions

Precautions for EnviraCOM bus connections to avoid improper operation.

Forced-Air Wiring Diagram (With EnviraCOM)

Forced-Air System Phase/Polarity

Advanced User Interface

Installer Setup Mode

How to enter and navigate installer setup for configuration.

Control Configuration Options

Enable Diagnostics and Error History

Control Re-baselining

Procedure to re-baseline control to save performance data.

Performance History

View Performance History

Accessing and viewing performance data like CAD cell and ignition time.

CAD Cell History Data

Ignition Time History Data

Error History

Error History Navigation

How to access and view error history screens.

Most Recent Error Display

Second Most Recent Error Display

Basic User Interface

Basic Interface Error Codes

Table of error codes for the basic interface.

Basic Interface Flame Strength Indication

Troubleshooting and Maintenance

Troubleshooting and Maintenance Precautions

Warnings about line voltage hazards and non-serviceable parts.

Cad Cell Resistance Check

How to check cad cell resistance without an ohmmeter.

Preliminary Troubleshooting Steps

Check Oil Primary Control

R7284 Operation

Electrical Shock Hazard Warning

Warning about electrical shock hazard when troubleshooting powered systems.

R7284 Operation: Call for Heat

Control actions when a call for heat is received.

R7284 Operation: Call Satisfied

R7284 Operation: Restricted Lockout

Behavior when reset three times without completing a call for heat.

Troubleshooting Information

Troubleshooting: Burner Not Starting

Procedures and corrective actions when burner doesn't start.

Troubleshooting: Burner Not Stopping

Procedures and corrective actions when burner doesn't stop.

Display Alarm: No Ignition (Igniter)

Corrective actions for "No Ignition" alarms related to the igniter.

Display Alarm: No Ignition (Cad Cell)

Corrective actions for "No Ignition" alarms related to the cad cell.

Display Alarm: No Ignition (General)

Corrective actions for general "No Ignition" alarms.

Display Alarm: Low Voltage

Display Alarm: Internal Error

Display Alarm Information Continued

Display Alarm: Flame Proven Out of Sequence

Corrective actions when flame is proven out of sequence.

Display Alarm: Flame Proven During On Delay

Display Alarm: Flame Proven During Off Delay

Display Alarm: Exceeded Max Recycles

Display Alarm: EnviraCOM Error

Display Alarm: Cad Cell High During Run

Display Alarm: Flame Proven Late in Trial

LED Flash Codes

LED Flash Code 1: No Ignition

LED Flash Code 2: Flame Loss/High Cad Cell

LED Flash Code 3: Flame Out of Sequence

LED Flash Code 4: Low Voltage/EnviraCOM Error

LED Flash Code 5: Internal Error

Safety and Disposal Warnings

Security Warning on Modification

Warning against unauthorized modification of hardware or software.