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Siemens Building Technologies
HVAC Products
• PH_THL1_1 (THL1): Maximum fan runup time to prepurging level. With «tv» > 0 or in
case of demanded forced prepurging
• PH_THL1_2 (THL1): Maximum fan runup time to ignition level. With «tv» = 0 and no
demanded forced prepurging
• PH_TV (tv): Prepurging phase
• PH_TBRE (TBRE): Maximum period of time for reaching the ignition level after
prepurging (reaching the speed band for the ignition load)
• PH_TW1 (TW1): Maximum waiting time until the following functions are performed:
−
Internal safety tests: These tests are started the moment the startup phase
commences and already run in the background during the preceding phases
−
Combustion optimization: Optimization of combustion deactivated or stepper motor
in start position
−
Speed readjustment: Checkback signal delivered when the required speed for the
ignition load is reached for the first time
• PH_TVZ (tvz): Preignition time (can be parameterized, but minimum is 0.2 seconds)
• PH_TSA1_1; PH_TSA2_1; PH_TSA1_2; PH_TSA2_2; (TSA): Ignition safety time. If,
on completion of this period of time, there is no flame (also after several reignition
attempts), the burner control will initiate lockout or make a restart, depending on the
parameter settings made.
With parameterization with abortion of the safety time in the case of flame detection,
«TSA» can be shortened via flame establishment (refer to «PH_TSA1_2»,
«PH_TSA2_2»).
Parameterization choice 1:
• PH_TSA1_1 (tsa1, max. TSA): First part of the safety time with ignition switched on.
The fuel valve is open
• PH_TSA2_1 (TSA - tsa1, max. TSA): Second part of the safety time with ignition
switched off. The fuel valve is open
Parameterization choice 2:
• PH_TSA1_2 (max. TSA): First part of the safety time with ignition switched on.
Once a flame signal is detected, the change to the «PH_TSA2_2» phase (switching
ignition off) takes place. If there is no establishment of flame, the burner control stays
in the «PH_TSA1_2» phase until the end of «TSA» is reached
• PH_TSA2_2 (0.2 seconds, can be run through several times during «TSA»):
Second part of the safety time with ignition switched off. The fuel valve is open. 0.2
seconds after the change to the «PH_TSA2_2» phase, the flame signal is checked. If,
in that case, the flame has been lost, an immediate reignition attempt is made by
returning to the «PH_TSA1_2» phase.
This procedure can repeat itself until the end of «TSA» is reached.
If the flame is still present, the change to the «PH_TI» phase takes place.
Operation:
Start of the operating position is the «PH_TI» phase. If interval «ti» is not required, it
cannot be parameterized to 0 but only to a minimum of 0.2 seconds.
• PH_TI; (ti), interval required for stabilization of the flame
• PH_MODULATION; (unlimited), controller operation. In this phase, the controller
result is output
Basic Documentation LMU54... / LMU64...
3 Functions
21/171
CC1P7494en
07.11.2002
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