Honeywell SDC Operating Instructions Manual page 25

Operation
4.1.2.8.2 Emission Measurement (Heating Controllers only)
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The switching differential corresponds to the set
differential for automatic control and is symmetrical to the
setpoint.
NOTE The heat generator high limit prevails over the heat
generator-switching differential and deactivates the heat
generator in case it is exceeded.
Application Controller malfunctions (emergency mode)
Breakdowns
Termination The return to the last selected operating mode is carried
out with the "manual mode" / "emission measurement"
key or the "Operating mode" key ¢.
CAUTION Emission Measurement has to be carried out by a
technician only.
By pressing "manual mode" / "emission measurement"
key the heat generator runs for 20 minutes at the set
maximum temperature limit. The remaining time is
visualized as it passes.
Function The direct heating circuit pump is activated if the
temperature in the heat generator exceeds 65 ºC. Any
existing mixing valves carry out the control upon
demand.
Below 60 ºC the pump is blocked and existing mixing
valves are closed.
The mixing circuit pumps remain continuously in function.
The DHW loading temperature remains continuously in
function.
WARNING Danger of scalding because the DHW temperature may
exceed the defined DHW setpoint.
Application Emission measurement via the chimney sweep.
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SDC / DHC 43
EN2H-0220 GE51 R1005