37
110839-01 -8/20
AP-U
Installation & Service Manual
NOTICE:
CHECK TEST PROCEDURE. A very
good test for isolating fuel side problems is to
disconnect the fuel system and with a 24” length
of tubing, fire out of an auxiliary five gallon pail of
clean, fresh, warm #2 oil from another source. If
the burner runs successfully when drawing out of
the auxiliary pail then the problem is isolated to
the fuel or fuel lines being used on the jobsite.
B. OIL PRIMARY CONTROL
(Oil Primary)
1. Burner (Oil Primary) will not come on.
a. No power to Oil Primary.
b. Oil Primary is in lockout or restricted mode.
Press reset button for one (1) second to exit
lockout. If control has recycled three times
within the same call for heat, it will enter into
restricted mode. To reset from restricted
mode, refer to Section VII, Paragraph I, Step
2 for details.
c. CAD cell seeing light.
d. CAD assembly defective.
e. Control motor relay is stuck closed (see
note below).
2. Burner (control) will light, then shut down after
a short time, then restart after one (1) minute.
a. CAD cell is defective.
b. Air leaking into oil line causing flame out.
c. Defective nozzle causing flame to be
erratic.
d. Excessive airflow or draft causing flame to
leave burner head.
e. Excessive back pressure causing flame to
be erratic.
3. Control locks out after Trial For Ignition (TFI).
a. No oil to burner.
b. Shorted electrodes.
c. Nozzle clogged.
d. Airflow too high.
e. Ignitor module defective.
f. CAD cell defective.
g. Oil valve stuck open or closed.
Note
: The Safety Monitoring Circuit (SMC) is
designed to provide lockout in the event
of a stuck or welded motor relay.
NOTICE:
If flame is not established within 15
seconds of oil valve actuation (known as Trial
For Ignition [TFI]) lockout will occur. Lockout is
indicated by a red LED solid-on located on the oil
primary control.
Hard Lockout will occur if the Oil Primary Control
locks-out three (3) times during a call for heat.
This is indicated by red light reset button solid-on.
11
Troubleshooting
(continued)
Summary of Contents for AP-U AP-110U-N
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