An earth connection is compulsory. CARRIER shall not be liable for incidents resulting from faulty or
non-existent earthing. Always follow the wiring diagram delivered with unit.
To access the electrical terminal block:
Disconnect the unit from the electrical power supply
Use a Phillips screwdriver or a size 7 Allen key to undo the 2 screws securing the electrics box cover (Fig. 7).
For the terminal strip, always use an electrician's flat-blade screwdriver.
42NH
offers a choice between two types of motor technology: asynchronous and brushless (low consumption).
■
The asynchronous motor:
To optimise the unit's performance and depending on the type of control used, the unit has five speeds numbered
V1(R5) to V5(R1) connected to the terminal block in the electrics box (V1(R5) = low speed and V5(R1) = high
speed).
The customer must wire the speeds for the thermostat at the top of the terminal block between V1(R5) to V5(R1).
To open a connection point and change the cabling (Fig. 8):
■ Place the end of a flat-blade screwdriver in the hole located just below the cable to be removed, release the
cable and move it to the marker for the desired speed.
■
Place the screwdriver in the hole again just below the desired speed, insert the cable and remove the screwdriver;
this ensures a secure contact.
Repeat the procedure for the remaining customer speeds.
IMPORTANT: the wires coming from the motor and connected to terminals V1(R5) to V5(R1) must never be
interconnected.
IMPORTANT: it is essential to refit the electrical box casing once all the cabling and adjustment operations
are complete.
■
The brushless motor:
Depending on the controller or thermostat fitted with the unit, the motor may be controlled by a 0-10V control signal.
■ With a controller managing a 0-10 V control signal:
The 0-10V setpoint voltage information is issued by the controller itself. Refer to the operating and configuration
instructions supplied by the manufacturer.
Warning: To prevent any risk of damage, never connect several asynchronous or brushless fan
coil unit motors in parallel for the same thermostat.
IMPORTANT NOTE: Brushless motor
The electrical connection for 42NH must be made in compliance with international standard IEC 60364
(Electrical Installations for Buildings).
The leakage current on all our comfort units conforms to the requirements of IEC 60335-2-40 (Safety of
household and similar electrical appliances):
■
Complete comfort unit (with electric heaters) equipped with a multi-speed motor: maximum leakage
current = 2 mA
■
Complete comfort unit (with electric heaters) equipped with an HEE motor (brushless technology): maximum
leakage current = 4.5 mA.
Electromagnetic compatibility in accordance with Emission standard 61000-6-3 EN 550141-1, tool class
and Immunity 61000-6-1 (Residential, commercial and light industry class).
4 - INSTALLATION AND CONNECTIONS
22
Содержание 42NH - CLZ
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