AXMP45~280MA-W
Gas driven heat pump air conditioners
Indoor unit
Installation manual
2
CAUTION
IMPORTANT REMINDER
Make sure that a separate power supply circuit is
provided for this unit and that all electrical work is
carried out by qualified personnel according to local
laws and regulations and this installation manual.
An insufficient power supply capacity or improper electrical
construction may lead to electric shocks or fire.
Be sure to install a secure earth connection.
Do not earth the unit to a utility pipe, arrester, or
telephone earth.
Incomplete earth may cause electrical shock, or fire.
A high surge current from lightening or other sources may
cause damage to the indoor unit.
Be sure to install an earth leakage breaker.
Failure to do so may result in electric shocks, or fire.
Never turn on the unit before finishing the installation
work.
Failure to do so could cause electrical shock or damage to
the indoor unit.
When clamping the wirings, be sure to clamp wires
appropriately not to apply any excessive power to the
wire connections.
Improper clamping could damage the wires and may result
in electric shocks, fire or the terminals overheating.
Make sure that the remote controller wiring, and the
transmission wiring between the unis, and other
electrical wiring do not pass through the same locations
outside the unit separating as followings:
- Outside the unit; at least 50 mm
- Inside the unit; at least 25 mm
Failure to do so could cause an electrical noise (external
static) and result in mistaken operation or breakage.
When wiring the power supply and connecting the
remote controller wiring and transmission wiring,
position the wires so that the switch box lid can be
securely fastened. When attaching the service lid, make
sure no wirings get caught in the edges.
Improper positioning of the switch box lid may result in
electric shocks, fire or the terminals overheating.
Never connect the power supply wiring to the terminal
board for transmission wiring.
This mistake could damage the entire system.
When performing field settings or test operation, do not
touch the drain pump.
This may cause electric shock.
Be sure to stop operation and turn the power switch off
before touching the electrical parts.
Failure to do so could result in an electrical shock or unit
malfunction.
Do not touch the switch with wet hands.
This may cause electric shock.
Be sure to handle with care for transporting the unit.
Some of the units are covered with the PP band for
strapping. Be sure not to grab straps when handling.
Be sure to dispose all of the packing materials after
taking out the unit.
Nails and wooden crates may cause a serious injury from
sticking. Plastic sheet covering the unit may result in an
asphyxia if a child play with it. Tear the plastic sheet before
disposing.
Locate the indoor and outdoor units, power supply
wiring and connecting wires at least 1 meter away from
televisions or radios in order to prevent image
interference or noise.
Depending on the radio waves, a distance of 1 meter may
not be sufficient enough to eliminate the noise.
Do not install the indoor unit in the following locations:
(a) where a mineral oil mist or an oil spray or vapor is
produced, for example in a kitchen
Plastic parts may deteriorate and fall off or result in
water leakage.
(b) where corrosive gas, such as sulfurous acid gas,
is produced
Corroding copper pipes or soldered parts may result in
refrigerant leakage.
(c) where flammable gases may leak, where there are
carbon fiber or ignitable dust suspensions in the
air, or where volatile flammables such as thinner or
gasoline are handled.
Operating the unit in such conditions may result in fire.
Do not install the unit tilted. The indoor unit is equipped
with a built-in drain pump and float switch.
If the unit is tilted against condensate flow, the float switch
may malfunction and cause water to drip.
Be sure to insulate any field piping all the way to the
piping connection inside the unit.
Any exposed piping may cause condensation or burns if
touched.
While following the instructions in this installation
manual, install drain piping in order to ensure proper
drainage and insulate piping in order to prevent
condensation.
Improper drain piping may result in water leakage and
property damage to furniture and belongings.
Be sure not to touch the heat exchanger fin.
Failure to do so may result in serious injury.
Be sure to wait for at least five minutes before turning
off the power switch after stopping the operation.
Failure to do so may cause water leakage or other problem.
• Remote controller (wireless kit) transmitting distance can result
shorter than expected in rooms with electronic fluorescent lamps.
(inverter or rapid start types)
Install the indoor unit as far away from fluorescent lamps as
possible.
• Electromagnetic waves may disturb the operation of the control
system and result in a malfunction of the unit. Do not install the
unit near machinery emitting electromagnetic waves.
• Be sure not to install the indoor unit into locations where the air
contains high levels of salt such as that near the ocean, where
the voltage fluctuates greatly such as that in a factories. Also in
vehicles and vessels.
• Do not use flux when brazing refrigerant piping. Therefore, use
the phosphor copper brazing filter metal (BCup-2: JIS Z 3264/B-
Cu93P-710/795/: ISO 3677) which does not require flux.
(Flux has extremely harmful influence on refrigerant piping
systems. For instance, if the chlorine based flux is used, it will
cause pipe corrosion or, in particular, if the flux contains fluorine,
it will damage the refrigeranl oil.)
• Do not use any antioxident sold on the market. It may have an
adverse effect on the refrigerant and compressor oil, resulting in
equipment breakdown.
• Be sure to prevent spatter generated by welding process from
coming in contact with the unit or entering into the unit. It may
damage the drain pan and result in equipment breakdown.
• Do not connect the drain piping directly to sewage pipes that
smell of ammonia. The ammonia in the sewage might enter the
indoor unit through the drain pipes and corrode the heat
exchanger. Keep in mind that it will become the cause of getting
drain pipe blocked if water collects on drain pipe.
• Do not remove the air filter except when cleaning. Unnecessary
handling may damage the filter.
