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Siemens Building Technologies Basic Documentation LMV5... CC1P7550en
HVAC Products 5 Fuel / air ratio control (FARC) 13.08.2004
The curves are defined by the 2 limits «Low-fire» (part load) and «Nominal load»
(maximum load).
In certain cases, it has proven practical to limit the burner’s output, either temporarily or
permanently.
This limitation of the burner’s working range can make sense in both directions. The
burner’s working range then looks as follows:
Pos.
Ignition
Low fire
Min. load
Max. load
Nominal load
AIR
AUX
FUEL
7550d06E
Load
Limited working range
The usable output range always lies within the defined curves. This means that if the
minimum load is smaller than the low-fire load, loads below the low-fire load will be dis-
regarded. And if the maximum load is greater than the high-fire load, loads above the
high-fire load will be disregarded.
If the minimum load is greater than or equal to the low-fire load, the minimum load as-
sumes the role of the low-fire load, that is, after ignition, the minimum load will be con-
sidered.
The 2 parameters «Minimum load» and «Maximum load» can be set depending on the
type of fuel burnt, whereby:
Low-fire load ≤ minimum load ≤ maximum load ≤ nominal load
Parameter: MinLoadGas
Parameter: MaxLoadGas
Parameter: MinLoadOil
Parameter: MaxLoadOil
Limitation of the
load range
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