Siemens LMV5 Series Technical Instructions page 351

LMV Series
Pilot Valve Proving (continued)
3. The times for each of the four stages of valve proving need to be set. To do so, use the
following menu paths in the LMV5:
Params & Display > BurnerControl > ValveProving > VP_EvacTme
Params & Display > BurnerControl > ValveProving > VP_TmeAtmPress
Params & Display > BurnerControl > ValveProving > VP_FillTme
Params & Display > BurnerControl > ValveProving > VP_Tme_GasPress
"VP_EvacTme" is the time that the downstream valve is energized in order to evacuate
the chamber between the upstream and downstream valves (phase 80). This is typically
set to 3 seconds, but should not be set any less than the opening time of the valves.
"VP_FillTme" is the time that the upstream valve is energized in order to pressurize the
chamber between the upstream and downstream valves (phase 82). This is typically set
to 3 seconds, but should not be set any less than the opening time of the valves.
"VP_TmeAtmPress" is the time that both the upstream and downstream valves are
closed to test the leakage rate of the upstream valve (phase 81). "VP_Tme_GasPress" is
the time that both the upstream and downstream valves are closed to test the leakage
rate of the downstream valve (phase 83). Both of these times should be set to the same
value. These times can be calculated using the following equation:
t = Time for setting parameters "VP_TmeAtmPress" and "VP_Tme_GasPress" in
test
seconds
P = Inlet gas pressure (pressure upstream of both valves) in PSIG
i
P = Gas pressure setting on pressure switch in PSIG (should be set for half of P
set
P = Atmospheric pressure downstream of both valves in PSIA (typically
atm
14.7 PSI)
V = Volume between the gas valves to be tested in ft
Q = Allowable leakage rate in ft
leak
For Option 3, these times should be calculated independently for the pilot and main
valves, and the larger of the calculated times should be used as the parameter setting.
4. Parameter "PreIgnitionTGas" should be set for its default of 2 seconds. This parameter
can be found at the following menu path in the LMV5:
Params & Display > BurnerControl > Times > TimesStartup1 > PreIgnitionTGas
SCC Inc.
− × × 3600
=
×
3
3
/hr
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Appendix A