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Function switch
( S1 and S2 are located on the back of
the controller insert. To move the functi -
on switch insert, remove it as described
in the installation instructions.)
n
Function switch S1
"Heating – Cooling"
In air-conditioning systems, the control -
ler can be used also to regulate the cooling load. The feedback of
the setting value (valve position) to the controller is provided by
means of a potentiometer in the servomotor, instead of the flow
sensor.
è
S1
H (Heating) = factory basic setting
è
S1
K (Cooling)
In setting K the following mean:
LED display
red
LED display green
n
Function switch S2 "Target Value Definition"
è
S2
2 (target value in the pro. range, like setting knob
= factory basic setting
è
S2
1 (Operating point is always at the target value)
Position 1 of the switch is appropriate for example for mixing
chamber or greenhouse regulations. With this setting the entire
operating characteristic curve goes only in one direction.
Position the setting knob
/
S1
S2
– colder
– hotter
B
always on 50.
S1
(greater cooling load)
(less cooling load)
S2
B
)
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