LEGEND - Password Access: U = User, S = Service, O = OEM, U/S = View - User, Write - Service, S/O = View - Service, Write - OEM
Shaded Parameters = Frequently Used. ** Parameters = Must Set. Fuel 1 parameters for LMV36 only.
Parameter Name
227 - 327 - 5 sec 1-10 sec
- 267 - 367 5 sec 1-15 sec
229 - 329 - 1.8 sec 0.4-9.6 sec
- 269 - 369 1.8 sec 0.4-14 sec
230 - 330 - 2 sec 0.4-60 sec
- 270 - 370 2 sec 0.4-60 sec
231 - 331 - 7 sec 1-10 sec
- 271 - 371 10 sec 1-15 sec
232 - 332 - 2 sec 0.4-60 sec
- 272 - 372 2 sec 0.4-60 sec
233 273 333 373 Afterburn Time 8 sec 0.2-60 sec
This setting defines the permissible time for a flame to be detected after the main fuel valves are closed
without causing an alarm.
234 274 334 374 Postpurge Time 1 15 sec 0.2-6480 sec
This setting defines the mandatory postpurge time. If a call for heat exists during this time, the LMV3 will
still continue to postpurge until this time expires. See parameter 248/284/348/384 for information on the
optional postpurge time. Sets the length of phase 74.
Air PS S/O 1 1-2
Sets the behavior of the air pressure switch (input X3-02.1):
1 = must be energized from prepurge through postpurge (phases 24-78)
2 = same as option 1 except the input can be de-energized during phases 60-66 without an alarm (only
permitted on pneumatic fuel train options - see parameters 201/301)
236 - 336 - Low Gas PS S 1 1-3
Sets the location of the low gas pressure switch (input X5-01.2):
1 = before upstream shutoff valve V1
2 = between shutoff valves V1 and V2 (low gas pressure switch is also used as valve proving pressure
switch)
3 = downstream of shutoff valves V1 and V2 (for B149.3 compliance)
When a fuel train with a pilot is used, this setting defines the overlap of the spark (output X4-02.3) and the
pilot valve (output X7-02.3). After this time expires, the spark is de-energized but the pilot valve remains
open if a flame is still present. If a flame is not sensed, a lockout will occur. If directly spark igniting the
main fuel, this defines the overlap of the spark and the main fuel valves (outputs X8-02.1 and X7-01.3). This
time is also known as TSA1. In summary, sets the length of phases 40-42.
Sets the time that the LMV3 will ignore the high and low gas pressure switch inputs after the main valves
open. This is done so that pressure spikes do not cause erroneous alarms on properly adjusted automatic
reset pressure switches. This parameter does not work with manual reset pressure switches.
O
235 335
S
When a fuel train is selected that has a pilot, this setting defines the pilot stabilizing period. This time
begins after TSA1 expires. During this period, only the pilot valve is open. The spark is de-energized. If
directly spark igniting the main fuel, this defines the main stabilizing period. In summary, sets the length of
phase 44.
O
When a fuel train with a pilot is used, this setting defines the overlap of the pilot (output X7-02.3) and the
main fuel valves. After this time expires, the pilot is de-energized. Shorter times are more safe. This
parameter has no effect for fuel trains having direct spark ignition of the main fuel. This time is also known
as TSA2. Sets the length of phase 50.
This setting defines the main flame stabilizing period at ignition position before modulation. This time
begins after TSA2 expires. During this period, only the main fuel valves are open. The pilot valve is de-
energized. This setting has no effect for fuel trains having direct spark ignition of the main fuel. Sets the
length of phase 52.
S
Safety Time 1
Pressure Reaction
Time
Interval 1
Safety Time 2
Interval 2
SCC Inc. Page 8 Section 3
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