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Building Technologies Basic Documentation LMV37.4... CC1P7546en
HVAC Products 29 Revision history of basic unit LMV37.4... 01.12.2009
Software version V01.80
• Optimization: Valve proving during shutdown after display error in operation
• Optimization: Any valve proving aborted by Pmin during shutdown is repeated
with the next startup
Software version V01.90
• Scaling of analog input changed (no burner OFF functionality)
• Optimization: Variable step width between ignition and low-fire (40% difference
in speed, independent of ramp time; traveling time varies between 4 and16
seconds with a 5- to 20-second ramp)
• Optimization: Checking the standardized speed between microcomputer 1 and
microcomputer 2 (wrong standardized speeds after restore)
Objective: Avoiding wrong standardized speeds after restore to new hardware
resulting from resonator tolerances of the 2 microcomputers
• Revision of standardization of VSD signal in terms of control and evaluation of
errors
• Optimization: Curve adjustment with pneumatic air-fuel ratio control. Here, the
curve can be adjusted with no need for making the standardization beforehand
of VSD
• Optimization: Parameter access when firing on oil
• Optimization: Assessment of Pmin in phase 62
Software version V2.00
• Correction to fuel train Gp1: Safety time 1 was up to 0.4 seconds too long
• Correction to fuel train Gp1: Evaluation of pressure switches in phases 40 to 50
(Pmin / Pmax were not valued in phase 44, Pmin / Pmax were evaluated in
phase 50 although the main valve was switched on)
• First error reception for gas shortage with first setting (gas shortage error was
exceeded with first setting of
OFF UPr – both errors occur in the same cycle)
• Timeout (parameter 127) or communication breakdown with the AZL2... leads
to lockout during the time the curves are set (error code: 167, diagnostics: 8)
→ with cold setting, no startup on completion of the password time
• Communication breakdown with the ACS410 (30 seconds) leads to lockout dur-
ing the time the curves are set (error code: 167, diagnostics 9)
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