Initial Lightoff Check For Proved Pilot; Flame Signal - Honeywell R4140G Installation Instructions Manual

For all other detectors, clean the detector lens, filter,
viewing window, and inside of the sight pipe, as
applicable.
For a C7012A,C,E or F Purple Peeper Ultraviolet Flame
Detector, replace the 113236 and 115330 Electron
Tubes, unless the detector is a solid state model.
With the burner running, check the temperature at the
detector. If it exceeds the detector's maximum rated
temperature:
— add additional insulation between the wall of the
combustion chamber and the detector,
— add a shield or screen to reflect radiated heat
away from the detector, or
— add cooling. (Refer to Sight Pipe Ventilation in the
Instructions for the detector.)
Make sure that the flame adjustment is not too lean.
Make sure the detector is properly sighting the flame.
If necessary, resight or reposition the detector.
If you cannot obtain proper operation, replace the plug-in
amplifier. If you continue to be unable to obtain proper
operation, replace the flame detector.
Initial Lightoff Check for Proved Pilot (All
Installations Using a Pilot)
Perform this check on all installations using a pilot. It should
immediately follow the preliminary inspection.
Flame Detector
Rectifying Flame Rod
Rectifying Photocell
C7012A,C Ultraviolet (Purple Peeper)
C7012E,F Ultraviolet (Purple Peeper)
C7015A Infrared (Lead Sulfide Cell)
C7027A, C7035A, or C7044A Ultraviolet
(Minipeeper)
C7076A Ultraviolet (Adjustable Sensitivity)
a
This minimum or stronger signal is easily obtained when the detector is correctly installed and positioned to sense flame
This current must be obtained before completing checkout.
properly.
b
When using an R7247B or an R7248B, circuitry tests the flame signal amplifier at least 150 times a minute during burner
operation and shuts down the burner if the
c
Do not permit signal to exceed five microamperes because it shortens the photocell life. Reduce the signal by using orifice
plates (aperture disks) or filters, as necessary.
d
If using an R7247C or an R7476A, circuitry tests all electronic components in the flame detection system (amplifier and
detector) 60 to 240 times a minute during burner operation and shuts down the burner if the detection system fails.
e
Shutter operation of the C7012E or F or C7076A causes fluctuations in the current reading. Read the average stable current,
disregarding the peaks.
f
The lead sulfide cells are available in two ranges of sensitivity: 104662B is lowest and 104662D is highest sensitivity. If a
sufficiently strong signal cannot otherwise be obtained, try a different cell of the same range. If necessary, substitute a cell of
higher sensitivity.
R4140G, L AND M FLAME SAFEGUARD PROGRAMMING CONTROLS
Table 4. Flame Signal.
Flame Signal Amplifier
R7247A (Green)
R7247B (Green Self Check)
R7247A Green
R7247B Green Self Check
R7247A (Green)
R7247B (Green Self Check)
e
R7247C (Green Self Check)
R7248A (Red)
R7248B (Red Ampli-Check)
R7249A (Purple)
e
R7476A (Blue Self Check)
amplifier
fails.
13
NOTE: Low fuel pressure limits, if used, could be open. If
so, bypass them with jumpers during this check.
Open the master switch.
Make sure the manual main fuel shutoff valve(s) is
closed. Open the manual pilot shutoff valve. If the pilot
takeoff is downstream from the manual main fuel
shutoff valve, make sure the main fuel is shut off just
upstream from the burner inlet, or disconnect power
from the automatic main fuel valve(s).
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.
Let the timer dial advance through PREPURGE. When
the IGN part of the dial is opposite the index notch,
spark should occur and the pilot should ignite. If it
ignites, proceed to step
If the pilot flame is not established in ten seconds,
safety shutdown occurs in about one-half minute. Let
the timer complete its revolution and stop.
Wait about one minute, reset the lockout switch, and let
the system recycle once. If the pilot still does not ignite,
make the following ignition/pilot adjustments:
a. Open the master switch and remove the
programmer from the subbase.
Minimum Acceptable
Steady Current
2
b
1-1/4
2
b
1-1/4
2
b
2
d e
2
2-1/4
b
3-1/2
3-1/2
d
2-1/2
.
Maximum Current
a
(uA) Expected (uA)
5
2-12
c
5
2-12
6
4
7
f
5
f
5
7-1/2
e
5-1l2
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