4 Using the HDG Euro – Displaying information
28
HDG Euro V3.0 with HDG Lambda Control 1 - V 1 - en
©
HDG Bavaria GmbH 06/2008
Example calculation for
operational readiness
450 operating hours at 20% readiness equates to 90 hours with the
boiler temperature above 88 ˚C
.
Consequence: The boiler would thus have been
overheated
for 90
hours.
Control program:
Operational
readiness
[%]
0.0
•
Display of the percentage of operating
hours during which the boiler
temperature was above 88 ˚C (*) during
the last 500 hours.
No access
Last fault
•
Most recent fault since the last query.
Operator
Display
Description
Authorised
Table 4/1 - Target value information
(*) If this value is too high, there is a danger of excessive soiling of
the boiler and the chimney!
Danger of fire in the chimney and flue!
See the following example calculation.
Control program
Indication in
display
Description
Standard control program
O2 control
program
•
Combustion is regulated according to the
residual oxygen content as measured by
the O2 sensor
Alternative control program
TA control
program
•
If the O2 sensor malfunctions or is
defective, the HDG Lambda Control
microprocessor controller switches from
the standard control program to the
alternative control program and uses the
flue gas temperature to regulate
combustion, thus ensuring temporary
emergency operation
Table 4/2 - Control program information
Indication in display when the alternative “
TA control
program
” is automatically initiated.
