Controller pack
Service Manual
82
Heating control functions
SMGB0066 rev.0 - 12/2009
Devices controlled by the
System Controller
DHW Zone 1 Zone 2
Devices controlled by the
Extension Controler
Heating zone 1 requires 50°C (calculated from OTC heating curve)
Heating zone 2 requires 35°C (calculated by extension controller)
DHW loading not required
S1=50°C,S2=35°C,SDHW=0°C
ThereforeSSUP=maximumof(50°C,35°C,0°C)=50°C
Note that the extension controller will then control the mixing circuit to achieve comfort conditions in zone 2.
The heating circuit is usually always enabled which means the controller will always try to provide the correct water
temperature to maintain the desired comfort conditions based on the heating characteristic curve as described below.
However,theheatingcircuitisdisabledwhen:
DHW storage tank loading is required.
or the summer switch-off condition is active
or the no-load condition is active
The System Controller is an Outside Temperature Compensated (OTC) control system that uses the outside
temperature,theroomtemperaturesetpoint,andoptionallytheroomtemperature,tocalculatethecorrectsupplywater
temperature for the system in order to maintain comfort conditions. A prerequisite for constant room comfort conditions is
the correct setting of the heating characteristic curve as well as the correct design of the heating system by the heating
installer according to heat demand calculations.
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