Siemens LMV5 Series Basic Documentation page 275

Modulating burners
Multistage burners
Siemens Building Technologies
HVAC Products
20.2.4 New load controller function for manipulated variable
input and load output
Manipulated variable input, modulating:
< 3 mA open-circuit
4 mA or 2 V
20 mA or 10 V
Burner shutdown at < 5 mA not used.
Load output, modulating:
< 3 mA open-circuit
4 mA 0 % load
xx mA low-fire (min. load)
xx mA high-fire (max. load)
20 mA 100 % load
Shutting the burner down = no impact on signal.
Manipulated variable input, multistage burner:
Stage 1: 5 mA or 2.5 V
Stage 2: 10 mA or 5 V
Stage 3: 15 mA or 7.5 V
Switching thresholds at:
7.5 mA and 12 mA with 0.5 Ma hysteresis
3.75 V and 6.25 V with 0.25 V hysteresis
Burner shutdown at < 5 mA not used.
< 3 mA: Open-circuit
Load output, multistage:
Burner off: 4 mA
Stage 1: 5 mA
Stage 2: 10 mA
Stage 3: 15 mA
20.3 Display and operating unit AZL51...
In connection with the new B-series of the basic unit (LMV51.XXXBXXX), the type
reference of the AZL5... has been changed to include C-series (AZL51.XXCXXX).
Hence, the type references indicate the state of release and show the unit versions that
work together.
20.3.1 Software changes to the flash memory
The software version of the flash memory has been changed from V02.20 to V02.50.
Basic Documentation LMV51...
20 Revision history
low-fire (min. load)
high-fire (max. load)
275/278
CC1P7550en
01.10.2003