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TABLE 7: CAD CELL RESISTANCE WHEN
SENSING FLAME
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.
•
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
•
To reset from Restricted Mode: Press and
hold the reset button for 30 seconds.
When the LED fl ashes twice, the device
has
reset.
v.
T-T Jumper: Select models have pre-
installed T-T jumper resistor. To remove
jumper, if applicable, 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 7 for equivalent cad cell
resistance.
•
Perform cad cell resistance check as
outlined in control feature. If resistance is
below 1600 OHMS and burner runs
beyond safety cut-out time, cad cell is
good.
•
If safety switch shuts down burner and
resistance is above 1600 OHMS, open line
switch to boiler. Access cad cell under
Summary of Contents for MPO Series
Page 6: ...6 Figure 1 MPO 84 Thru MPO 231 Water Boiler ...
Page 22: ...22 Figure 13A Water Boiler Piping for Circulator Zoned Heating System Supply Side Circulator ...
Page 38: ...38 Figure 27 L1 L2 and V1 Head Electrode Positioning and Gun Setting Beckett AFG ...
Page 49: ...49 SERVICE RECORD DATE SERVICE PERFORMED ...
Page 50: ...50 Bare Boiler Assembly ...
Page 52: ...52 Bare Boiler Assembly ...
Page 54: ...54 Jacket Assembly ...
Page 56: ...56 MPO84 Thru MPO231 Water Boilers Trim and Controls ...
Page 58: ...58 Beckett AFG Burner ...
Page 61: ...61 Figure A2 LWCO Location ...
