Description Of Sequence Diagrams - Siemens LMS14 User Manual

Standby
Startup
Building Technologies Division

6.35.10 Description of sequence diagrams


PH_STANDBY (unlimited)
Burner control waits for a request for heat from the controller.

PH_STARTVER
No external or internal release. The respective diagnostic code is delivered.
The change from Standby to Operation is termed startup – triggered by a request for
heat from the controller. If startup includes prepurging, startup begins with the THL1
phase, without prepurging with the THL1A phase.

THL1
Maximum fan ramp-up time to prepurge level. With prepurge phase (t1) >0 or when
there is a request for forced prepurging.

THL1A
Maximum fan ramp-up time to ignition level. With prepurge phase (t1) = 0 and when
there is no request for forced prepurging.

TV (t1)
Prepurge phase.

TBRE
Maximum time required to reach the ignition level after prepurging (reaching the speed
band for ignition load).

TW1
Maximum waiting time until the following functions are completely performed:
- Internal safety tests: These tests start with the beginning of the startup sequence and
already run in the background during the preceding phases
- Combustion optimization: Combustion optimum switched off, or stepper motor in the
start position
- Fan speed adjustment: Feedback when the required fan speed for the ignition load
has been reached for the first time

TVZ
Preignition time (can be parameterized, but minimum is 0.2 seconds).

TSA
Ignition safety time. If no flame is established on completion of this period of time
(including several reignition attempts), the burner control goes to lockout or makes a
restart, depending on the parameter settings.

TSA1
First part of safety time with ignition on. Fuel valve is open.
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28.01.2015