CLEAN BURN CB 140, Operator'S Manual

Page: 140 / 142

Operator's Manual: Models CB-1750, CB-2500 & CB-3250
B-12
Pump Prime To enter pump prime: 1. Start a CFH cycle. During Pre-Ignition or Pre-Purge, press Reset until motor turns off (10 seconds), then
in Pump Prime, release Reset button.
Optional Pump Prime notes: 1) If lost, press Reset for 1 second and release, then if the control is not in Pump Prime, restart the se-
Reset button is pressed.
TFI
Run The burn
Lockout lockout occurs. The control turns the red LED on
constant, and closes the alarm contact.
To Reset Push in and hold reset button for 2 seconds, then release.
Latch-up If the control locks out 3 times during a single call for heat, latch-up occurs. The control turns on both the amber and red LED’s con-
stant. You must use the special procedure below to reset the control after latch-up.
repeated burner lockouts must be corrected before returning the burner to normal operation.
the control will restart (releasing the button before the LED’s turn off will cause the control to remain in latch-up).
The 40200 & 42230 controls will retain lockout or latch-up if power is interrupted.
Flame failure Recycle : Control waits for 65 seconds (with
f .
Stand-by Control remains in stand-by mode until limit circuit sends power to the black wire and thermostat circuit closes (call for heat).
Service & Troubleshooting
Burner (control) will not come on
No power to control
• Check limit circuit to the control (at least 102
VAC
).
• Check all electrical connections.
Control is in lockout
• Red LED will be on. Press the reset button for 2 seconds.
CAD cell seeing light
• Green LED on, and amber LED blinking 1 second on, 4 seconds
off. Remove one yellow lead from FF terminals. If the amber LED
If the amber LED goes OFF, the control is OK, and;
• light is leaking into the burner housing,
OR
• CAD cell is defective,
OR
• there is a problem with the CAD cell wiring or holder.
• If appliance was recently shut down, CAD cell may see residual
hot spots in chamber.
To troubleshoot:
• Attach multimeter to monitor CAD cell resistance. Dark
resistance should be over 50K ohms, and room light resis-
Replace cell if necessary, or reinstall and close the burner
housing.
• Check for stray light by measuring the CAD cell resistance
looking into the inactive combustion chamber. It should read
at least 50
KOHMS
.
Other no start problems
If the CAD cell is OK, and the amber LED still blinks 1 second on, 4
seconds off, the other possible failures include:
•
on, 1/2 second off, 1 second on, 3 seconds off, then repeats).
Check line voltage.
• Internal fault: CAD cell, and line voltage OK, the issue may be
an internal fault . Replace the control.
Check for:
• CAD cell is defective. Replace.
• -
•
•
check for proper air band setting and draft.
•
Control locks out at end of TFI ( red LED on)
Check for:
•
• Shorted electrodes- inspect for cracked porcelain and replace
as needed.
• Poor spark- check electrode spacing and condition per burner
manual. Replace or realign if necessary.
• Nozzle clogged- replace nozzle.
•
• Ignitor module defective- replace if no spark.
• CAD cell defective
• Oil valve (if used) stuck in closed position.
• Check wiring connections.
Start-up & operation continued...
C77010
Understanding the Oil Primary Control (continued)
Model 40200 / 42230 Cad Cell Oil Primary Control Data Sheet