Before Installation (Relocation); Before Electrical Work; Before Starting The Test Run; Specifications - Mitsubishi Electric PUH-8 Installation Manual

• When installing the unit in a hospital, communication station, or similar
place, provide sufficient protection against noise.
- The inverter equipment, private power generator, high-frequency medical
equipment, or radio communication equipment may cause the air conditioner
to operate erroneously, or fail to operate. On the other hand, the air condi-
tioner may affect such equipment by creating noise that disturbs medical
treatment or image broadcasting.
• Do not install the unit on a structure that may cause leakage.
- When the room humidity exceeds 80 % or when the drain pipe is clogged,
condensation may drip from the indoor unit. Perform collective drainage work
together with the outdoor unit, as required.

1.2. Before installation (relocation)

• Do not wash the air conditioner units.
- Washing them may cause an electric shock.
• Be careful that the installation base is not damaged by long use.
- If the damage is left uncorrected, the unit may fall and cause personal injury
or property damage.
• Install the drain piping according to this Installation Manual to ensure
proper drainage. Wrap thermal insulation around the pipes to prevent
condensation.
- Improper drain piping may cause water leakage and damage to furniture
and other possessions.
• Be very careful about product transportation.
- Only one person should not carry the product if it weighs more than 20 kg.
- Some products use PP bands for packaging. Do not use any PP bands for a
means of transportation. It is dangerous.
- Do not touch the heat exchanger fins. Doing so may cut your fingers.
- When transporting the outdoor unit, suspend it at the specified positions on
the unit base. Also support the outdoor unit at four points so that it cannot
slip sideways.
• Safely dispose of the packing materials.
- Packing materials, such as nails and other metal or wooden parts, may cause
stabs or other injuries.
- Tear apart and throw away plastic packaging bags so that children will not
play with them. If children play with a plastic bag which was not torn apart,
they face the risk of suffocation.

2. Specifications

The units are provided with the following accessories:
[Fig. 2.0.1] (P.2)
Accessory name
1 Connection pipe with flange
2 Packing (Gasket)
3 Conduit mounting plate ø27
4 Conduit mounting plate ø34
5 Tapping screw M4 × 12

3. Selecting an installation site

Consider the requirements below, and choose a suitable location to install the
outdoor unit.
• Place where no direct heat radiation from another heat source.
• Place where no possibility of short cycle operations caused by exhoust heat
from unit.
• Place where the noise from the unit must not disturb neighbors.
• The unit must not be exposed to strong wind.
• Place where no possibility of snow wind.
• The installation location must have enough strength to hold the weight of the
unit.
• Keep in mind that some water flows out of the unit while heating.
• The services and the airway shown in the figures must be available at the
installation location.
In order to prevent a fire, never install the outdoor unit where any inflammable
gas can be generated, flow in, accumulate, or leak.
• Avoid a location where acids and/or sulphurous substance are frequently used.
• If there is a possibility of operating the unit for cooling when the outdoor tem-
perature is 10°C or below, install the outdoor unit where it is not exposed to
direct rain and/or snow, or install an air outlet duct and air inlet duct in order to
stabilize its operation.
• Never use the unit in an environment where there is a lot of oil, steam, and/or
sulphurous gas.
• Place the unit where the piping and wiring connections can be made conven-
iently.

1.3. Before electrical work

Caution:
• Ground the unit.
- Do not connect the ground wire to gas or water pipes, lightning rods, or
telephone ground lines. Improper grounding may result in electric shock.
• The reverse phase of L lines (L
but the reverse phase of L lines and N line can be not be detected.
- The some electric parts should be damaged when power is supplied under
the miss wiring.
• Install the power cable so that tension is not applied to the cable.
- Tension may cause the cable to break and generate heat and cause a fire.
• Install an earth leakage circuit breaker, as required.
- If an earth leakage circuit breaker is not installed, electric shock may result.
• Use power line cables of sufficient current carrying capacity and rating.
- Cables that are too small may leak, generate heat, and cause a fire.
• Use only a circuit breaker and fuse of the specified capacity.
- A fuse or circuit breaker of a larger capacity or a steel or copper wire may
result in a general unit failure or fire.

1.4. Before starting the test run

Caution:
• Turn on the power at least 12 hours before starting operation.
- Starting operation immediately after turning on the main power switch can
result in severe damage to internal parts. Keep the power switch turned on
during the operational season.
• Do not touch the switches with wet fingers.
- Touching a switch with wet fingers can cause electric shock.
• Do not touch the refrigerant pipes during and immediately after opera-
tion.
- During and immediately after operation, the refrigerant pipes are may be hot
and may be cold, depending on the condition of the refrigerant flowing through
the refrigerant piping, compressor, and other refrigerant cycle parts. Your
hands may suffer burns or frostbite if you touch the refrigerant pipes.
• Do not operate the air conditioner with the panels and guards removed.
- Rotating, hot, or high-voltage parts can cause injuries.
• Do not turn off the power immediately after stopping operation.
- Always wait at least five minutes before turning off the power. Otherwise,
water leakage and trouble may occur.
Model (Qty.)
PUH-8, 10
1
1
1
1
4
Caution:
* Choose an installation location where the noise of the outdoor unit does
not disturb neighbors.
- If necessary, build sound barrier walls around the unit or take some other
measures to reduce the noise.
In the case that the unit is installed on a roof or where there is no surrounding
building and it is expected that the unit will be exposed to strong wind, take some
measures to prevent strong wind from directly blowing into the unit's air outlet.
Such strong wind blowing directly into the air outlet can prevent the unit from se-
curing enough airflow that it needs to function correctly.
[Fig.3.0.1] (P.2)
If there is a wall close to the unit, place the air outlet so that it faces the wall and at
a distance of 500 mm or more from the wall.
[Fig.3.0.2] (P.2)
Where the unit is exposed to direct wind and you know the usual direction of the
wind in the season(s) when the unit is operated, position the air outlet at a right
angle to the usual wind direction.
[Fig.3.0.3] (P.2)
Where strong wind from a typhoon, etc. can directly blow into the air outlet, attach
an air outlet guide (Optional part).
, L , L ) can be detected (Error cord: F1),
1 2 3
A Air outlet guide (Optional part)
9