89
Control
NOTICE
System heat-up to temperatures signifi cantly exceeding the set temperature value
During Auto-Tuning mode the system may heat up to temperatures signifi cantly 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 equiva-
lent 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 me-
thod 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-RTC2 / CZ-RTC4) 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 follow-
ing section.
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).
!
Summary of Contents for PAW-160MAH2
Page 3: ...Air Handling Unit Kit Installation Instructions SET AL1 OUT ATU PV SV ºC ºC ...
Page 4: ......
Page 99: ...97 ...
Page 100: ...Notes ...
Page 101: ...Notes ...
