R4140G, L AND M FLAME SAFEGUARD PROGRAMMING CONTROLS
60-0770—2
15
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Let the timer dial advance through PREPURGE. When
the IGN part of the dial is opposite the index notch,
watch for ignition spark and listen for the click of the
first stage oil solenoid. (If spark does not occur or the
first stage oil valve does not open, refer to Symptom E
in Table 5 in the Troubleshooting section.)
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Let the programmer complete its revolution and stop.
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Open the manual first stage oil valve.
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Reset the lockout switch and recycle the programmer
through PREPURGE.
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When the IGN part of the timer dial is opposite the
index notch, watch for the first stage burner flame to be
established. If it is, proceed to step
씊
.
쐅
If the first stage burner flame is not established within
five seconds, or within the normal lightoff time specified
by the burner manufacturer, close the manual first
stage oil valve and open the master switch.
쐈
Purge the combustion chamber to remove any
unburned oil; then check all burner adjustments.
쐉
Wait about three minutes. Close the master switch,
open the manual first stage oil valve, and try lightoff
again. The first attempt may have been required to
purge the lines and bring sufficient oil to the burner.
씈
If the first stage burner flame is not established within
five seconds, or within the normal lightoff time specified
by the burner manufacturer, close the manual first
stage oil valve and open the master switch.
씉
If necessary, repeat steps
쐈
through
씈
to establish the
first stage burner flame. Then proceed to step
씊
.
씊
When the first stage burner flame is established, the
timer dial advances to the end of MAIN and stops.
Make burner adjustments for flame stability and input
rating. If a second stage is used, make sure the
automatic second stage oil valve opened.
씋
Shut down the system by lowering the setpoint of the
burner controller. Make sure the burner flame goes out
and all automatic oil valves close.
씌
If used, remove the bypass jumpers from the low fuel
pressure limits.
씍
If a second stage is used, check the lightoff as follows;
otherwise, proceed to step
씎
.
a.
Open the manual second stage oil valve.
b.
Restart the system by raising the setpoint of the
burner controller.
c.
When the first stage burner flame is established,
watch for the automatic second stage oil valve to
open. Observe that the second stage lights off
properly.
d.
Make burner adjustments for flame stability and
input rating.
e.
Shut down the system by lowering the setpoint of
the burner controller. Make sure the burner
flames go out and all automatic oil valves close.
f.
Proceed to step
씎
.
씎
Restart the system by raising the setpoint of the burner
controller. Observe that the burner flame is established
during IGN, within the normal lightoff time specified by
the burner manufacturer.
씏
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 the high and the low firing rate
positions and while modulating, if applicable. Any
pulsating or unsteady readings require further
adjustments.
IMPORTANT
Make sure all readings are in the required ranges
before proceeding.
Pilot Turndown Test (All Installations using
a Pilot)
Perform this check on all installations using a pilot. It should
immediately follow the initial lightoff check. The purpose of
this test is to ensure that the main burner can be lighted by
the smallest pilot flame that can hold in the 2K (flame) relay.
Clean the flame detector(s) to ensure it can detect the
smallest acceptable pilot flame.
NOTE:
Low fuel pressure limits, if used, could be open. If
so, bypass them with jumpers during this test.
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Open the master switch.
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Close the manual main fuel shutoff valve(s).
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Connect a manometer (or pressure gauge) to measure
pilot gas pressure during the turndown test.
���
Open the manual pilot shutoff valve.
���
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.
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When the IGN area of the timer dial is opposite the
index notch, set the timer switch to the TEST position to
stop the timer. Relay 2K should pull in when the pilot
ignites.
NOTE:
If the timer does not stop, recycle the
programmer and set the timer switch as soon
as the beginning of the IGN area of the timer
dial reaches the index notch.
IMPORTANT
You have only six seconds to stop the timer after the
ignition starts.
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Turn down the pilot pressure very slowly, reading the
manometer (or gauge) as it drops. Stop instantly when
relay 2K drops out. Note the pressure at the dropout
point. The pilot is at the turndown position. Immediately,
turn up the pilot pressure until relay 2K pulls in again.
NOTE:
With the timer stopped in this position, the
lockout switch heats when 2K is not pulled in.
If 2K is out for a total of about one-half minute,
safety shutdown occurs.
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Repeat step
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to verify the pilot gas pressure reading
at the exact point of relay 2K dropout.
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Increase the pilot pressure immediately to pull in 2K,
and then turn it down slowly to obtain a pressure
reading just above the dropout point.
쐅
Set the timer switch to the NORM position and let the
timer proceed. When the MAIN area of the timer dial
reaches 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
ignition. If the main burner flame is established,
proceed to step
씌
.