44
CHECk OIL PRIMARY CONTROLS.
5.
PRELIMINARY STEPS
A.
Check wiring connections and power supply.
I.
Make sure power is on to the controls.
II.
Make sure limit control is closed.
III.
Check contacts between igniter and the electrodes.
IV.
Check the oil pump pressure.
V.
Check the piping to the oil tank.
VI.
Check the oil nozzle, oil supply, and oil filter.
VII.
CHECK SAFETY FEATURES - SAFE START
B.
Place a jumper across cad cell terminals.
I.
Follow procedure to turn on burner. Burner must not start,
II.
indicator light turns on and control remains in idle Mode.
Remove jumper.
III.
SIMULATE IGNITION OR FLAME FAILURE
C.
:
Follow procedure to turn on burner.
I.
Close hand valve in oil supply line.
II.
Failure occurs, device enters Recycle Mode. Indicator light
III.
flashes 2 seconds on, 2 seconds off.
Device tries to restart system after approximately 60 seconds.
IV.
After third Recycle Mode trial, safety switch locks out within
V.
safety switch timing indicated on label and control enters
Restricted Mode. Indicator light flashes 1/2 second on, 1/2
Second off. Ignition and motor stop and oil valves closes.
To reset from Restricted Mode: Press and hold the reset but-
VI.
ton for 30 seconds. When the LED flashes twice, the device
has reset.
Cad Cell Check : see
D.
Figure #23
.
Perform cad cell resistance check as outlined in control feature.
I.
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
II.
OHMS, turn on power to the boiler. Access cad cell under
igniter, clean face of cad cell and see that cell is securely in
socket. Check gasket around perimeter of igniter lid for proper
seal. If gasket is missing or damaged, replace gasket. Room
light can affect cad cell resistance. Reset safety switch.
Turn off power. If burner starts and runs beyond safety switch
III.
cut-off time, cell is good. If not, install new cell.
Power Failure Check: After flame is established, turn the power
E.
off to the control / burner. The burner should shut down safely.
When power is restored, a normal ignition sequence should be
started.
CHECk HIGH TEMPERATURE LIMIT CONTROL
6.
-
Jumper Thermostat Terminals. Allow burner to operate until
shut down by limit. Installation is not considered complete
until this check has been made.
!
WARNING
Jumper must be removed after this check!
OPerATiNg THe BOiLer - SYSTeM STArT-UP
Figure 23 - CAD Cell Location
!
CAUTION
Due to the potential hazard of line voltage, only a trained,
experienced service technician should perform the following
safety checks.
This control contains no field serviceable parts. Do not attempt
to take it apart. Replace entire control if operation is not as
described.