65
Control
NOTICE
System heat-up to temperatures significantly exceeding the set temperature value
During Auto-Tuning mode the system may heat up to temperatures significantly exceeding the
set temperature value and may cause damage to sensitive applications.
► Before starting the Auto-Tuning mode, the set temperature value should be
reduced to an uncritical value.
Switching from “heating mode” to “cooling mode”
The thermostat is factory-set to the so called “heating mode”:
● When the actual temperature value (shown on the PV display) is below the set
temperature value (shown on the SV display), the controller is trying to reach
the set value by activating a heating system which is connected to the control
relay output on terminals 6–7. This control method is called “normally open (NO)
control output”. If a SSR output is used instead of a mechanical relay output, an
equivalent voltage is activated at the ouput.
● When the actual temperature value is above the set temperature value, the
output is inactive.
To use the controller in so called “cooling mode“, the output must be negated. This control
method is called “normally closed (NC) ouput”:
● When the actual temperature value is above the set temperature value, the
output is activated.
● When the actual temperature value is below the set temperature value, the
output is inactive.
To switch from “heating mode” to “cooling mode”, perform the following steps:
1. Press and hold the
and
buttons jointly for approximately 5 seconds.
1 x 2 buttons for 5 sec.
The PV display shows “PAS”, while the current setting (“0”) in the SV display is blinking.
Note:
After 30 seconds of idleness, the display automatically returns from parametrization
view to normal view.
2. Use the
,
and
buttons to change the value to “–72” (minus 72).
3. Confirm the new setting by pressing the
button.
1 x briefly
The PV display now shows “nun”, while the SV display now shows “3”.
!
