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Mitsubishi Electric E Series Data Book page 91

Air cooled chilling unit
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5. Wiring Design
2. Precautions when fastening screws
* Faulty contacts due to loose screws may cause overheating and fire.
* Using the circuit board while it is damaged may cause overheating and fire.
<1> Screw fastening torque
Power supply terminal block, M8 screw: 10 to 13.5 N·m
Use the following methods to check that the screws have been fastened.
1) Check that the spring washer is in a parallel position.
* If the screw is biting into the washer, simply fastening the screw to the specified torque cannot determine whether it
has been installed properly.
Loose screws
2) Check that the wiring does not move at the screw terminal.
<2> Take extra care not to ruin the screw thread due to fastening the screw at an angle.
* To prevent fastening the screw at an angle, install the round terminals so they are back to back.
<3> After fastening the screw, use a permanent marker to tick off the screw head, washer and terminal.
Ticked with marker
3. Installing the conduit tube
Always use a conduit to run the power supply wiring.
Select the conduit size based on the hole.
The cable conduits must be prepared locally.
Do not store the 24VDC or less low-voltage circuit and 100VAC or higher main circuit and control circuit cables in the
same multi-core cable, or bundle them together.
Attach cable conduits securely to the foundation, etc. to ensure that excessive loads are not applied to the power supply
terminal box.
Seal the area around the cable conduit connection to ensure that no water penetrates the cable conduit connection port.
MEES19K040
Properly installed
Spring washer is in a parallel position
For transition wiring
Power supply wiring
Install the round terminals so they are back to back.
Power supply terminal block
90

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