Carlin 301CRD - Manual (Page 17)

Model 201CRD & 301CRD 240-VAC Advanced oil burners — Instruction manual
Carlin part number MN2301A Rev. 10/21/10
– 17 –
Start-up & operation
Do not start the burner if the combustion chamber contains
oil or oil vapor.
Per UL requirements, the control will not turn on if the cad
cell senses fl ame during the self-test. If the cad cell sees
light, the control will remain in self-test mode until the cad
cell no longer senses light (fl ame). The amber LED will re-
main on, but blink off momentarily every 3 to 4 seconds.
Check 50240 control label for trial for ignition (TFI)timing.
Model 50240 diagnostic LED’s
– Red OFF – Red ON – Red FLASHING
– Amber OFF – Amber ON – Amber FLASHING
– Amber BLINKING (blinks off momentarily every 3 to 4 seconds)
Service & Troubleshooting
Burner (control) will not come on
No power to control
• Check line voltage 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 1 sec-
ond.
• If the control returns immediately to lockout, The Safety
Monitoring Circuit may have detected an internal con-
trol problem. Replace the control.
CAD cell seeing light
• Amber LED blinks off each 3 to 4 seconds. Remove
one yellow lead from FF terminal on the control.
If the amber LED remains on with a wire detached,
the control is defective.
If amber LED goes off , 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:
• Check CAD cell by unplugging it and measuring
the resistance across its pins: dark resistance at
least 50
KOHMS
; room light resistance less than
10
KOHMS
. Replace if necessary. If the CAD cell
functions properly, reinstall the cell 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 .
Repeated fl ame failures ( fl ashing red LED)
Check for:
• CAD cell is defective.
• Air leaking into oil line causing fl ame out — Check oil line
connections and fi lter gasket.
• Defective nozzle causing fl ame to be erratic — Change
nozzle.
• Excessive airfl ow or draft causing fl ame to leave burner
head — Check for proper air shutter setting and draft.
• Excessive back pressure causing fl ame to be erratic —
Check appliance and fl ue for sooting/plugging.
Control locks out after TFI ( red LED on)
Check for:
• No oil to burner — Check oil supply, fi lter, lines.
• 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.
• Airfl ow too high — Check air shutter setting.
• Ignitor module defective — Replace if no spark.
• CAD cell defective.
• Oil valve stuck in closed position.
• Check wiring connections.
Power ON Open all manual oil line valves. Close the line switch. (If Red light
turns on constant , control is in lockout. See below to reset.)
Self-test 1 Each time the limit circuit sends power to the black wire, the con-
trol performs a “boot-up” test to verify internal operation. About 4
seconds after power application, the amber LED turns on. The test
continues for about 6 more seconds. If the test fails, the control
turns the amber LED off and repeats this test sequence until suc-
cessful. (This test occurs on every call for heat cycle if burner is
operated by a limit control (terminals “T-T” jumpered).
Stand-by (Thermostat circuit open, limit circuit closed) If Self-test 1 is
successful, amber LED turns off and control waits for thermostat
circuit to close.
Call for heat Set thermostat to call for heat. Thermostat circuit must close (and
black wire must receive power from the limit circuit).
Self-test 2 The amber LED turns on. For the fi rst 3 to 4 seconds, the control
performs a self-test. If the cad cell senses fl ame, the control
repeats this test until fl ame is no longer detected. During this time,
the amber LED remains on, but blinks off momentarily every 3
to 4 seconds. If the control detects motor contacts closed, lockout
occurs.
Burner on After the self-test, amber LED turns off. The ignitor starts, fol-
lowed 1 second later by the motor. The electronic time delay relay
allows the oil valve to open 4 seconds later.
TFI The cad cell must sense fl ame within the TFI time limit (trial for
ignition). After cad cell senses fl ame, the ignitor stays on another
10 seconds (fl ame stabilization period).
Run The burner continues fi ring during call for heat if the cad cell
senses fl ame. LED’s are off during normal running.
Lockout If cad cell does not sense fl ame within 15 seconds after burner
starts, lockout occurs. The control turns the red LED on constant,
and closes the alarm contact.
To Reset Push in and hold reset button for 1 second, 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
constant. You must use the special procedure below to reset the
control after latch-up.
Reset after latch-up — Only a qualifi ed service techni-
cian should attempt to reset the control after latch-up. The
problem that caused the repeated burner problems must be
corrected before returning the burner to normal operation.
Push in and hold the reset button for about 10 seconds. The
amber and red LED’s will begin to fl ash alternately.
After the LED’s begin fl ashing, continue holding the reset button
for about another 20 seconds. The LED’s will turn off. Release the
reset button and the control will restart. (Releasing the button be-
fore the LED’s turn off will cause the control to remain in latch-up.)
The 50240 control will not reset from lockout or latch-up if power is
interrupted.
Flame failure If the cad cell loses fl ame signal during operation (after the TFI),
the red LED fl ashes. The burner shuts off within 2 seconds. Re-
cycle: Control waits for 65 seconds (with red LED fl ashing), then
begins again at Self-test 2. Red LED goes off .
End cycle Set thermostat (or aquastat) to stop call for heat. The burner shuts
off within 2 seconds after end of call for heat.
Stand-by Control remains in stand-by mode until limit circuit sends power to
the black wire (call for heat).