12
Other Connections
Figure 20
– Condensate draining
Electrical Equipment Wiring
The external connection of the internal electrical equipment of the
air-handling unit can be made via wiring the terminal boxes which
are situated on the outer side of the air-handling unit (the service
side according to the designer‘s specification). The internal electrical
equipment of the air-handling unit has already been connected to the
terminals of these wiring terminal boxes. The wiring and installation
of the M&C system elements must be performed by qualified profes-
sionals authorized to perform wiring of the given type of device. The
wiring must be performed in accordance with directives and standards
of the state of installation, and in accordance with the Installation and
Operating Instructions of individual pieces of equipment (frequency
converters, pressure and temperature sensors, etc). Before putting
the air-handling unit into operation, a wiring inspection must be
performed.
elastic
connection
DV
Figure 17 –
připojení potrubí
Figure 21 –
Air-handling duct connection
Siphon - positive pressure
Siphon - negative pressure
Siphon - negative pressure
(with a disconnecting trap)
Hmin (mm) = P (Pa) / 10
P – total pressure of the fan
Air-Handling Duct Connection
The air ducting must be connected to the air-handling unit via an
elastic element to avoid the transfer of vibrations and eliminate
the misalignment of the duct and inlet of the air-handling unit. The
connection must be performed so that no loading from the air duct
will be transferred to the inlet panel of the air-handling unit and no
deformation of this panel will be possible.
The accessories must be installed in accordance with the air-handling
unit specification and Installation Instructions of the manufacturers
of such accessories.
No other structures must obstruct the unit inspection door opening,
or unit operating and maintenance.
The air-handling unit can also be equipped with a siphon with a
disconnecting trap and a ball valve (only negative pressure sections).
This type of siphon need not be filled with water before putting it into
operation.
If there is a risk of freezing, it is necessary to insulate the siphon and
condensate draining piping, respectively keep the ambient tempera-
ture above freezing point, e.g. with an electric heating cable! The gas
heater section is provided with a condensate draining outlet (1/2“
pipe) to drain the condensate from the combustion chamber.
Before starting the wiring, check the following:
Conformity of the power supply parameters with the data on the
type plate of the connected section.
Cross-sections of connecting cables.
Wiring of Motors
The motors are equipped with thermo-contacts which protect them
against overheating. The thermo-contacts must be connected as
shown in the wiring diagram. The service switch (delivered as an
optional accessory separately) is not installed on the unit. The service
switch connection must be performed in accordance with directives
and standards of the state of installation, and in accordance with the
Installation and Operating Instructions.
The service switch (delivered as an optional accessory) serves to
disconnect the fan from the power supply and from voltage supplied
to the TK thermo-contacts. It prevents unintentional start-up and pres-
ence of voltage on the TK terminals when performing maintenance.
This switch is not a substitute for the main or emergency
switches.
After switching the service switch on again, it is necessary
to check the state of the STE and STD relays, respectively, of the
parent control system, and reset the failure of the TK thermo-contacts
caused by disconnecting the service switch
.
Warning: When performing any maintenance or repairs, the device
must always be disconnected from the power supply!
Single-Speed Motors
Rated voltage and wiring for
asynchronous motors up to 3 kW:
230 VD / 400 VY
Rated voltage and wiring for
asynchronous motors above 3 kW:
400 VD / 690 VY
The motors are connected in the factory to the wiring terminal
boxes situated on the external casing of the fan sections. As
standard, they are designed for a power supply of 3x 400 V / 50 Hz.
The motor can be optionally delivered for a frequency of 60 Hz.
Warning:
If you are considering connecting the air-handling unit
to a 60 Hz power supply system, it is necessary to check whether
the parameters of the air-handling unit have been designed for
this frequency. If the delivery contains an output controlling
frequency converter
Danfoss, FC051 series, degree of protection
IP21 for motors up to 0.75 kW (included), the power supply for
the frequency converter (input) will be 1 x 230 V/50 Hz (while the
frequency converter output will be 3 x 230 V VD).
Power supply for motors with power output above 1.5 kW
equipped with FC051 series frequency inverters, IP21 and motors
equipped with FC101 series frequency inverters is 3 x 400V/50 Hz.
If the single-speed motor is additionally equipped with an
output controller (frequency converter) it is necessary to check,
respectively reconnect, the motor wiring (the correct connection
in the motor terminal box is Y/D) in accordance with the input
voltage (230/400V).
Two-Speed Motors
6/4 pole motors - two separate windings Y/Y
(output, respectively speed ratio 2:3)
4/2 and 8/4 pole motors - Dahlander D/YY
(output, respectively speed ratio 1:2)
The two-speed motors are connected to the wiring terminal boxes
situated on the external casing of the fan sections. The rated mo-
tor voltage for 1st and 2nd speed stage is
3 x 400 V / 50 Hz. Before starting the wiring, it is necessary to
look for the appropriate wiring diagram further in this manual
corresponding with the data on the type plate.
