Install Instructions

44
2. IF NOZZLE CONTINUES TO DRIP, repeat
Paragraph H, No. 1. If this does not stop the
dripping, remove cut-off valve and seat, and wipe
both with a clean cloth until clean, then replace
and readjust oil pressure. If dripping or after burn
persist replace fuel pump.
I. CHECK THERMOSTAT OPERATION.
Raise and lower thermostat setting as required to start
and stop burner.
WARNING
Before installation of the boiler is considered
complete, the operation of all boiler controls
must be checked, particularly the primary control
and high limit control.
J. VERIFY HONEYWELL OIL PRIMARY
FEATURES using procedures outlined in Instructions
furnished with control or instructions as follows:
1. R7284 FEATURES AND CONTROLS
a. The Oil Primary is a microprocessor-based
control. The indicator light provides diagnostic
information for lockout, recycling and patented
cad cell status.
b. Pump Priming Cycle: To facilitate purging air
from the oil lines and lters. The R7284 can
be placed in a purge routine by pressing and
releasing the up arrow button during the Trial
For Ignition. “Pump Prime” is shown on the
oil primary display along with the time left on
the Trail 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
subtracts a minute from the TFI time (see Figure
25).
c. Limited Recycle: This feature limits the number
of recycle trials (for each call for heat) to a
maximum of three trials. If the ame is lost
three times and does not successfully satisfy a
call for heat, the Oil Primary locks out.
d. 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.
e. All R7284 models have internal "TT Congured
ON" parameters set to "ON".
f. The R7284 has an LCD display and simply
displays lockout and ame status on it.
g. Cad Cell Resistance Check: For proper
operation it is important that the cad cell
resistance is below 1600 ohms.
Cad Cell Resistance (ohms) is measured by the
oil primary. The thresholds are:
< 1600 Ohms Normal operation
> 1600 Ohms Service burner soon
> 6100 Ohms Flame loss, burner shuts down
> 9999 Ohms Check for broken cell or wire.
R7284 displays resistance in ohms during
Running Mode.
2. CHECK OIL PRIMARY CONTROL
CAUTION
Due to the potential hazard of line voltage,
only a trained, experienced service technician
should perform the following safety checks.
This control contains no field-serviceable
parts. Do not attempt to take it apart. Replace
entire control if operation is not as described.
a. Preliminary Steps
• 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.
• Check the piping to the oil tank.
• Check the oil nozzle, oil supply and oil lter.
b. Check Safety Features
Safe Start:
• 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.
• Remove jumper.
SECTION VIII: SYSTEM START-UP (continued)
Figure 25: R7284 Oil Primary Terminals,
Display and Function Buttons