MULTI V
Indoor Unit
10. Installation
52
Wall Mounted Unit (Standard)
– 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.
10.3.2 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.
10.3.3 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.
• When clamping the wires, be sure no pressure is applied to the wire connections by using the included clamping
material to make appropriate clamps. Also, when wiring, make sure the cover on the electric parts box fits snugly
by arranging the wires neatly and attaching the electric parts box cover firmly. When attaching the electric parts
box cover, make sure no wires get caught in the edges. Pass wiring through the wiring through holes to prevent
damage to them.
• Make sure the remote controller wiring, the wiring between the units, and other electrical wiring do not pass
through the same locations outside of the unit, separating them properly, otherwise electrical noise (external
static) could cause product malfunction.
10.3.4 Wired Remote Controller Installation (Optional)
Since the room temperature sensor is in the remote controller, the remote controller box should be installed in a
place away from direct sunlight, high humidity and direct supply of cold air to maintain proper space temperature.
