R4140G, L AND M FLAME SAFEGUARD PROGRAMMING CONTROLS
60-0770—2
14
b.
On the subbase, jumper terminal L1 to the
ignition terminal (5, 6, or 18). Refer to the
appropriate wiring diagram to determine the
proper terminal. Disconnect the leadwire to the
pilot valve if it is connected to the same terminal.
c.
Close the master switch only to energize the
ignition transformer.
d.
If the ignition spark is not strong and continuous,
open the master switch and adjust the ignition
electrode spark gap setting to the manufacturer’s
recommendation.
e.
Make sure the ignition electrodes are clean.
f.
Close the master switch and observe the spark.
g.
Once a continuous spark is obtained, open the
master switch and add a jumper on the subbase
from terminal L1 to the pilot terminal (5 or 6).
Reconnect the leadwire from the pilot valve if it
was disconnected in step b.
h.
Close the master switch to energize both the
ignition transformer and the pilot valve.
I.
If the pilot does not ignite and if the ignition spark
is still continuous, adjust the pilot gas pressure
regulator until a pilot is established.
j.
When the pilot ignites properly and stays ignited,
open the master switch and remove the jumper(s)
from terminals L1-5, L1-6, or L1-18 of the
subbase.
k.
Check for adequate fuel line bleeding.
l.
Reinstall the programmer on the subbase, reset
the lockout switch, and close the master switch.
���
When the pilot ignites, measure the flame signal. If
necessary, adjust the flame or detector to give a proper
flame signal.
���
Recycle the system to recheck lightoff and the pilot
flame signal.
���
When the MAIN part of the timer dial is opposite the
index notch, make sure the automatic main fuel
valve(s) opens; then smoothly open the manual main
fuel shutoff valve (and manually opened safety shutoff
valve, if used) and watch for main burner flame ignition.
When the main burner flame is established, proceed to
step
씊
.
NOTE:
This step requires two people—one to open
the manual valve(s) and one to watch for
ignition.
쐅
If the main burner flame is not established within five
seconds, or within the normal lightoff time specified by
the burner manufacturer, close the manual main fuel
shutoff valve(s) and open the master switch.
쐈
Purge the combustion chamber to remove any
unburned fuel. Check all burner adjustments.
쐉
Wait about three minutes. Reset the lockout switch,
close the master switch, and let the programmer
recycle to MAIN. Smoothly open the manual fuel shutoff
valve(s) and try lightoff again. The first attempt may
have been required to purge the lines and bring
sufficient fuel to the burner.
NOTE:
This step requires two people—one to open
the manual valve(s) and one to watch for
ignition.
씈
If the main burner flame is not established within five sec-
onds, or within the normal lightoff time specified by the
burner manufacturer, close the manual main fuel shutoff
valve(s) and open the master switch. Check all burner
adjustments.
씉
Repeat steps
쐈
through
씈
to establish the main
burner flame.
씊
When the main burner flame is established, the timer
dial advances to the end of MAIN and stops. Make
burner adjustments for flame stability and input rating.
씋
Shut down the system by lowering the setpoint of the
burner controller. Make sure the main burner flame
goes out. If using an intermittent pilot, make sure the
pilot flame goes out. Make sure all automatic fuel
valves close.
씌
If used, remove the bypass jumpers from the low fuel
pressure limits.
씍
Restart the system by raising the setpoint of the burner
controller. Observe that the pilot is established during
IGN and the main burner flame during MAIN, within the
normal lightoff time specified by the burner
manufacturer.
씎
Measure the flame signal. Continue to check for the
proper signal (Table 4) through the MAIN part of the
timer dial, and into the Run period after the timer stops.
Check the signal at both high and low firing rate
positions and while modulating, if applicable.
씏
Run the burner through another sequence, observing
the flame signal for:
—
pilot alone (unless using direct spark ignition)
—
pilot and main burner flame together, and
—
main burner flame alone (unless monitoring an
intermittent pilot).
Also observe the time to light the main burner.
IMPORTANT
Make sure all readings are in the required ranges
before proceeding.
Initial Lightoff Check for Direct Spark
Ignition of Oil (Oil Burners not Using a Pilot)
This check applies for oil burners not using a pilot. It should
immediately follow the preliminary inspection.
Refer to the appropriate sample block diagram of field wiring
in the R4140 Specifications for the ignition transformer and
fuel valve(s) hookup.
NOTE:
Low fuel pressure limits, if used, could be open. If
so, bypass them with jumpers during this check.
���
Open the master switch.
���
Complete the normal ready-to-fire checkout of the oil
supply and equipment as recommended by the burner
manufacturer.
���
Close all manual fuel shutoff valves. Check that the
automatic fuel valves are closed. Make sure oil is not
entering the combustion chamber.
���
Close the master switch and start the system with a call
for heat (raise the setpoint of the burner controller). The
burner motor (blower) should run, the programmer
timer should start, and prepurge should begin.