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SWX EX12, SWX EX22
Electrical connection of the fan motor
1. All installation work must be performed by a qualified electrician.
2. The fan heater is constructed for 400 VAC, 3 phase.
3. Electrical connection to the mains requires fixed wiring. A multi-pole breaker with a minimum 3 mm contact gap must
be installed in the fixed installation, using Ex approved components in the risk area.
4. There is connection (see photo 8) for external equipotential bonding at the back of the heater chassis, indicated by a ground
symbol. Minimum conductor size shall be 4 mm² and torque of M6 screw is 6Nm. Spring washer between
ring terminal and screw.
Photo 8
5. Install the enclosed cable ties on the inside of the bracket where the fan motor cable will be attached, see photo 9
Photo 9
6. Install the cable glands and the stopping plugs in the enclosed Ex junction box to match the wiring, see photo 10
for an example. Also read through the separate installation instructions for the Ex junction box.
7. Mount the junction box next to the bracket where the fan motor connection cable will be attached, see photo 11.
Photo 11
8. Attach the fan motor connection cable as shown in photo 12. The fan motor wiring diagram can be found in appendix C.
The fan motor is fitted with PTC thermistors to protect against overheating, and must therefore be connected to motor
protector U-EK230E (Ziehl Abegg) and a contactor (see appendix C), placed in non hazardous areas.
9. Make sure that the fan motor rotates clockwise, as seen through the protective grille.
Photo 10
Photo 12
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