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v.
T-T Jumper: Select models have pre-
installed T-T jumper resistor. To remove,
use side-cutting pliers to cut jumper (See
Figure 28).
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 fl ame.
•
Off: cad cell is not sensing fl ame.
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, once the control has
entered the Run Mode, press and release the
reset button. Indicator light will fl ash 1 to 4
fl ashes. See Table 5 for equivalent cad cell
resistance.
TABLE 5: CAD CELL RESISTANCE WHEN
SENSING FLAME
F
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6
b. CHECK OIL PRIMARY CONTROL
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i.
Preliminary Steps
•
Check wiring connections and power
supply.
•
Make sure power is on to the controls.
•
Make sure limit control is closed.
70
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•
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
fi lter.
ii. 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.
iii. Simulate Ignition or Flame Failure:
•
Follow procedure to turn on burner.
•
Close hand valve in oil supply line.
•
Failure occurs, device enters Recycle
Mode. Indicator light fl ashes at ¼ Hz rate
2 seconds on, 2 seconds off).
•
Device tries to restart system after
approximately 60 seconds.
•
After third Recycle Mode trial, safety
switch locks out within safety switch
timing indicated on label and control
enters Restricted Mode. Indicator light
fl ashes at 1 Hz rate (½ second on, ½
second off). Ignition and motor stop and
oil valves closes.
•
To reset from Restricted Mode: Press and
hold the reset button for 30 seconds.
When the LED fl ashes twice, the device
has reset.
iv. Cad Cell Check: See Figure 29.
Figure 29: Cad Cell Location
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