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ATTENTION
!
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
an 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.
Important:
On AHU Kit models equipped with thermostat TR-16e, the mode can be changed automatically by
the remote controller (CZ-RTC5B) or by an external control signal via the terminal contacts (DI1
– DI3). (In case the mode is not changing automatically on the TR-16e, perform the steps in the
following section to ensure that parameter PSL is set to "3" in step 5.)
However, on models equipped with thermostat TR-16, switching modes cannot be achieved
automatically. Instead, the intended mode change needs to be done as explained in the following
section.
To switch from "heating mode" to "cooling mode", perform the following steps:
1. Press and hold the
S S E E T T
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
S S E E T T
3. Confirm the new setting by pressing the
S S E E T T
The PV display now shows "nun", while the SV display now shows "3".
AHU Kit – Installation Instructions – 11/2021
S S E E T T
and
buttons jointly for approximately 5 seconds.
TR-16e
1 x 2 buttons for 5 sec.
,
and
buttons to change the value to "–72" (minus 72).
TR-16e
TR-16e
1 x briefly
S S E E T T
button.
Control
7
105
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