Ceiling Cassette Air Handler Installation Manual
WARNING
CAUTION
• Ground the air conditioner.
• Be sure to install an earth leakage breaker. Failure to install an earth leakage breaker may result
in electric shocks.
• Connect the outdoor unit wires, then connect the indoor unit wires.
DO NOT connect the ground wire to gas or water pipes, lightning rod or a telephone ground
wire. Inappropriate grounding may result in electric shocks.
DO NOT connect the air conditioner with the power supply until the wiring and piping is done.
DO NOT operate your air conditioner in a wet room such as a bathroom or laundry room.
DO NOT install the air conditioner in the following circumstance:
• There are combustible gases present.
• There is salty air surrounding (near the coast).
• There is caustic gas (the sulde, for example) existing in the air (near a hot spring).
• There is excessive vibration, as in a shop or factory.
• In small, hot industrial space such as a server room or commercial kitchen.
• In kitchen where it is full of oil gas.
• There is strong electromagnetic waves existing.
• There are inammable materials or gas.
• There is acid or alkaline liquid evaporating.
• Other special conditions.
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Revised 5/14/2020
• Wiring routing must be properly arranged so that control board cover is xed properly.
If control board cover is not xed perfectly, it can cause heat-up at connection point of
terminal, re or electrical shock.
• If the supply cord is damaged, it must be replaced by the manufacture or its service agent or
a similarly qualied person in order to avoid a hazard.
• An electrical disconnect switch having a contact separation of at least 0.12in in all poles
should be connected in xed wiring.
• When carrying out piping connection, take care to not let air substances go into refrigeration
cycle. Otherwise, it can cause lower capacity, abnormally high pressure in the refrigeration
cycle, explosion and injury.
• Do not share the single circuit with other electrical appliances. Otherwise, it can cause poor
performance, re or electrical shock.
• If the refrigerant leaks during installation, ventilate the area immediately. Toxic gas may be
produced if the refrigerant comes in contact with re.
• The temperature of refrigerant circuit will be high, please keep the interconnection cable
away from the copper tube.
• After completing the installation work, check that the refrigerant does not leak. Toxic gas may
be produced if the refrigerant leaks into the room and comes into contact with a source of
re, such as a fan heater, stove or cooker.
• After completing the installation, make sure that the unit operates properly during the start-
up operation.