4 Operation
TA units equipped with Electrical heater performs 3 minutes of re-cooling after the unit have been turned of.
Note:
• If activating the fire alarm when the heater is switched on, the fan stops immediate without re-cooling,
this can cause the overheating protection to trip. See figure 2 and figure 3 where to reset.
• Reset of the overheat protection must be done by an authorized electrician.
• An omni-polar disconnecting switch must precede the unit.
4.1 Temperature control possibilities
Type of Control
Temperature sensor placement
Description/function
Supply air temperature control:
The supply air temperature sensor
is placed in the supply air duct
approximately 3m after the unit.
Controls the temperature of the
supply air
Supply air temperature control
with outdoor air temperature
compensation:
2 temperature sensors are
needed.
The outdoor temp sensor is
mounted in the duct connected to
the inlet of the unit.
The supply air temp sensor is
placed in the supply air duct
approximately 3m after the unit.
Compensates for low outdoor
temperatures by increasing the
supply air temperature with an
optional value to avoid sudden
temperature drops in the interior
of the building. Preset is +
20K temperature increase at
-20°C outdoor temperature and
+15K increase at 0°C outdoor
temperature.
Extract air temperature control:
2 temperature sensors are
needed.
The extract air temp sensor is
placed in the extract air duct or
in the room if the building lacks
extract air ducting.
The supply air temp sensor is
placed in the supply air duct
approximately 3m after the unit.
Set the extract air temperature
b16°C to +30°C (preset
is +18°C).
To ensure that the supply air
temperature produced by the
unit is not too low or too high, a
minimum and maximum supply
air temperature value can be set
by the installer/operator. Preset
minimum temperature is +12°C
and maximum temperature is
+30°C.
4.2 Heat start
The heat control always starts from 100% output signal.
Operation and Maintenance Instructions
132616
7
Systemair Sverige AB
