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Siemens Building Technologies
Basic Documentation LMU54... / LMU64...
CC1P7494en
HVAC Products
3 Functions
07.11.2002
In compliance with the standards, a differentiation must be made with regard to the
responses in the sequence diagram for the different boiler capacity ranges.
Parameter «FaProgFlags1» can be used to select the 3 following ranges:
FaProgFlags1 (Bit7)
FaProgFlags1 (Bit6)
Capacity range
0
0
< 70 kW
0
1
70...120 kW
1
0
> 120 kW
From these 3 capacity ranges, the following differences emerge:
Capacity range
Subject
< 70 kW
70 - 120 kW
> 120 kW
Air supply failure during
prepurging, ignition or in
operation:
1)
Response:
Home run; during the safety time and
in operation also forced prepurging.
During prepurging, immediate lockout.
Response:
Home run on first occurrence, one restart permitted
(number 0 / 1 can be parameterized). Then lockout;
also forced prepurging.
During prepurging, immediate lockout.
Repetition counter is reset in the
«
PH_TI
» phase
.
Response:
Lockout
position
4)
Failure during
establishment of flame:
2)
Response:
Shutdown on first occurrence, restart
permitted (number of restarts can be
parameterized). Then lockout; also
forced prepurging.
Repetition counter is reset in phase
«
PH_TI
»
.
Response:
Shutdown on first occurrence, one restart permitted
(number 0 / 1 can be parameterized). Then lockout;
also forced prepurging.
Repetition counter is reset in the
«
PH_TI
»
phase.
Response:
Lockout
position
4)
Loss of flame during
operation:
3)
Response:
Shutdown
Response:
Shutdown on first occurrence, one restart permitted
(number 0 / 1 can be parameterized). Then lockout;
also forced prepurging.
Repetition counter is reset in the
«
PH_TI
»
phase.
Response:
Lockout
position
4)
1)
With the LMU...: Failure of speed supervision or speed feedback signal below the valid
range.
Relevant phases: PH_TV, PH_TW1, PH_TW2, PH_TVZ, PH_TSA1_1, PH_TSA2_1,
PH_TSA1_2, PH_TSA2_2, PH_TI, PH_MODULATION
2)
With the LMU...: No flame at the end of the safety time. Relevant phases: PH_TSA1_1,
PH_TSA2_1, PH_TSA1_2, PH_TSA2_2
3)
With the LMU...: Loss of flame during phases
«
PH_TI
»
and
«
PH_MODULATION
»
4)
Accomplished by parameterizing the specified value for the start repetitions to 0
The different capacity
ranges
