User Guide

37
103876-08 - 1/19
CL
Installation & Service Manual
• Release the reset button. The yellow
light will turn off and the burner will
start up again.
• At burner start up, click the reset
button while the igniter is till on.
This will transition the control to a
dedicated Pump Prime mode, during
which the motor, igniter, and valve are
powered for four (4) minutes. The
yellow light will be on.
• At the end of four (4) minutes, the
yellow light will turn off and the control
will automatically return to standby
mode.
iii. 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 7505 locks out.
iv. 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.
v. T-T Jumper: Select models have pre-
installed T-T jumper. DO NOT remove
jumper.
Note: DO NOT remove "T-T" jumper unless
wiring diagram indicates a direct
connection from thermostat and/or
tankless heater aquastat control to
the oil burner primary control's "T-T"
terminal. Refer to appropriate wiring
diagram, see Figure 21, 22, 23 or 24.
vi. Diagnostic LED: The indicator light on
oil primary control provides lockout,
recycle and cad cell indications as
follows:
• Flashing at 1 Hz (½ second on, ½
second off): system is locked out or
in Restricted Mode.
• Flashing at ¼ Hz (2 seconds on, 2
seconds off): control is in Recycle
Mode.
• On: cad cell is sensing flame.
• Off: cad cell is not sensing flame.
vii. Cad Cell Resistance Check: For proper
operation it is important that the cad
cell resistance is below 1600 ohms.
During a normal call for heat, the cad
cell leads can be unplugged from the
control and the resistance measured
with a meter in the
conventional way.
Conduct these tests with flame present,
see chart below.
Flame Detection Range
Normal (0 - 1600 ohms)
Limited (1600 ohms to
lockout)
b. Verify Oil Primary Control Features using
procedures outlined in Carlin Model EZ-
1/2/3 Oil Burner-Instruction Manual (Form
“MNEZ123) for Operational details of,
Electronic Oil Burner Primary Control, Model
70200. Also refer to Trouble Shooting Oil
Primary Control in this manual.
3. 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
filter.
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.
c. Simulate Ignition or Flame Failure:
• Follow procedure to turn on burner.
• Check cad cell resistance. If resistance
is below 1600 OHMS and burner runs
beyond safety cut-out time, cad cell is
good.
5 System Start-Up (continued)