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The control unit is not intended for operation in environments containing a high concentration of dust,
moisture, explosive and aggressive admixtures etc. If the automatic control system is supplied separately
from ventilation equipment its installation must enable convenient access by maintenance personnel
and easy connection of cables. The mounting surface must be even. The control unit installation must
ensure sufficient space for preventive maintenance and service. Prior to installation check the package for
completeness against the bill of lading and make sure that the contents are intact.
Control unit installation:
While choosing the automatic control system installation site refer to the design
documentation and technical regulations.
Check the installation site for control unit mounting and attachment readiness and ensure
availability of piping and electrical wires at the intended control unit site as well as their proper
marking according to the design documentation.
Install and secure the control unit and make sure it is properly grounded.
Install and secure the external sensors and instruments. Connect the wires to the control
unit terminal blocks in accordance with the external connections diagram (see Fig. 11 and 12).
Control System Sensor layout.
Supply air temperature sensor TE5 must be installed downstream of the water coils or air cooler
at all times to ensure proper regulation and prevent its freezing. The sensor is intended for measuring
the supply air temperature and, therefore, may not be installed indoors.
Heat exchanger freezing protection sensor TE3 (measuring the return water temperature) must
be installed in the return water pipe in such a way so as to ensure its sufficient contact with the return
water (see Fig. 3).
The heating water circuit must ensure all the required functions specific to the hydronic coil
heater control and safety (in addition to maintaining the proper hot water temperature and flow or
antifreeze filling to the proper level) according to the specifications contained in the air handling
equipment design documentation.
Heat exchanger freezing protection sensor. TE4 (measuring the return water temperature
downstream of the hydronic water coil heater) must be installed directly on the hydronic water coil
heater surface on the hot air exhaust side (see Fig. 3).
Counter ow Connection
Thermal Converter
Fig. 3
Thermal Converter
SaFetY preCautiOnS
Direct Flow Connection
Thermal Converter
Thermal Converter
7
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