Honeywell DHC, Service Manual

Page: 143 / 262

SDC / DHC Hydraulic Components
EN2H-0221GE51 R0812 143
When the temperature limit is exceeded the heat generator is
disabled and inhibited permanently. It can only be unlocked by a
reset in the "Fault Messages" menu.
With the parameter set accordingly, the allowable temperature
limit for the flue gas, according to specifications of the heat
generator manufacturer, has to be entered as the reference value
for the follow-up functions described above.
Recommended setting:
Nominal flue gas temp. acc. to manufacturer data, plus 10 - 20 K
5.4.6 "Heat generator" menu (HEAT GENER., Pg. 99
7.1.20 Burner counter mode
The system features two operating hour and burner start-up
counters (one each for the 1st and 2nd stages). The display is
output on the information level of the counter.
The function of the operating hour counter can be set via a
parameter.
The operating hour counter is deactivated.
If an operating hour counter is connected to the corresponding
inputs of the controller (operating hour counter inputs), this value
is called upon for counting.
Otherwise, theoretical values are determined and included
(switching times and switching frequency of the outputs).
If a signal was detected once at the operating hour counter input
and the operating hour counter signal does not follow the boiler
demand, a fault message occurs.
Functions such as AUTO, however a theoretical value is not
determined. Only signals from burners are processed.
The operating hour counter input can be used as a free counting
input. A fault message does not arise if a signal is missing.
Since the counter values are only stored in the permanent data
memory once per day, counter values of the current day could be
lost in case of a power failure.
Flue gas temperature
limit
See also
OFF
AUTO
Feedback only
Free counter
NOTE