8. Installation
40
MULTI/SINGLE
Indoor unit
Ceiling concealed duct - Middle static pressure
8.5 Electric wiring work
8.5.1 General instructions
• All field supplied parts and materials, electric works must conform to local codes. Use copper wire only.
• Follow the
"WIRING DIAGRAM”
attached to the unit body to wire the outdoor unit, indoor units and the remote
controller.
• All wiring must be performed by an authorized electrician.
• A circuit breaker capable of shutting down the power supply to the entire system must be installed.
CAUTION
After the confirmation of the above conditions, prepare the wiring as follows:
– Never fail to have separate power specially for the air conditioner.
– Provide a circuit breaker switch between power source and the unit.
– Confirm the Specification of power source.
– Confirm that electrical capacity is sufficient.
– Be sure that the starting voltage is maintained at more than 90 percent of the rated voltage marked on the
name plate.
– Confirm that the cable thickness is as specified in the power sources specification.
(Particularly note the relation between cable length and thickness.)
– Do not install the leakage breaker in a place which is wet or moist.
Water or moist may cause short circuit.
– The following troubles would be caused by voltage drop-down.
» Vibration of a magnetic switch, damage on the contact point there of, fuse breaking, disturbance to the
normal function of a overload protection device.
» Proper starting power is not given to the compressor.
8.5.2 Wiring connection
• Connect the wires to the terminals on the control board ind vidually according to the outdoor unit connection.
• Ensure that the color of the wires of outdoor unit and the terminal No. are the same as those of indoor unit
respectively.
• In case of the system with multiple indoor units, mark each indoor unit as unit A, unit B, etc and be sure the
terminal board wiring to the outdoor unit and indoor units are properly matched. If wiring and piping between the
outdoor unit and an indoor unit are mismatched, the system may cause a malfunction.
8.5.3 Clamping of cables
1. Arrange 2 power cables on the control panel.
2. First, fasten the steel clamp with a screw to the inner boss of control panel.
3. For connecting of communication (transmission) cable, put the 0.75mm
2
cable(or thinner cable) on the clamp
and tighten it with a plastic clamp to the other boss of the control panel. In case that communication
(transmission) cable is not needed to connect, fix the other side of the clamp with a screw strongly.
WARNING
• Make sure that the screws of the terminal are fixed tightly.
• The screw which fasten the wiring in the casing of electrical fittings are liable to come loose from vibrations to
which the unit is subjected during the course of transportation. Check them and make sure that they are all tightly
fastened. (If they are loose, it could give rise to burn-out of the wires.)
• Make sure to attach the sealing material or (field supplied) to hole of wiring to prevent the infiltration of foreign
particle from outside. Otherwise a short-circuit may occur inside the electric parts box.
