Install Instructions

42
EMP
Installation & Service Manual
109529-03 - 11/19
Beckett NX Burners
a. Move the Head/Air Setting forward or back
one position at a time to optimize the smoke
and CO
2
readings. See Figure 31.
NOTE: Step outlined in Paragraph G, Steps 1
and 2 above MUST BE repeated every time
the Head/Turbulator or air Damper Setting is
readjusted.
H. CHECK FOR CLEAN CUT OFF OF
BURNER.
1. AIR IN THE OIL LINE between fuel unit
and nozzle will compress when burner is on
and will expand when burner stops, causing
oil to squirt from nozzle at low pressure as
burner slows down and causing nozzle to drip
after burner stops. Usually cycling the burner
operation about 5 to 10 times will rid oil line of
this air.
2. IF NOZZLE CONTINUES TO DRIP, repeat
Paragraph H, Step 1 above. 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. TEST CONTROLS.
1. 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. There is a
manual reset button to exit the Lockout
Mode and enter the Idle Mode (see Figure
33).
b. 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. “Pump Prime”
is shown on the oil primary 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
subtracts a minute from the TFI time (see
Figure 33).
c. 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 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. T-T Jumper: All R7284 models have internal
"TT Configured ON" parameters set to "ON".
The R7284 has an LCD display and simply
displays lockout and flame status on it.
f 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.
8 System Start-Up (continued)
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