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1. Safety precautions
• When installing or relocating, or servicing the air to water heat pump, use
only the specified refrigerant (R32) to charge the refrigerant lines. Do not
mix it with any other refrigerant and do not allow air to remain in the lines.
If air is mixed with the refrigerant, then it can be the cause of abnormal high
pressure in the refrigerant line, and may result in an explosion and other
hazards.
The use of any refrigerant other than that specified for the system will cause
mechanical failure or system malfunction or unit breakdown. In the worst
case, this could lead to a serious impediment to securing product safety.
• Use only accessories authorized by Mitsubishi Electric and ask a dealer
or an authorized technician to install them. If accessories are incorrectly
installed, water leakage, electric shock, or fire may result.
• Do not alter the unit. It may cause fire, electric shock, injury or water leak-
age.
• The user should never attempt to repair the unit or transfer it to another
location. If the unit is installed incorrectly, water leakage, electric shock, or
fire may result. If the air to water heat pump must be repaired or moved, ask
a dealer or an authorized technician.
• When the refrigeration circuit has a leak, DO NOT execute pump down with
the compressor.
• When pumping down the refrigerant, stop the compressor before discon-
necting the refrigerant pipes. The compressor may burst if air etc. get into it.
• After installation has been completed, check for refrigerant leaks. If refriger-
ant leaks into the room and comes into contact with the flame of a heater or
portable cooking range, poisonous gases will be released.
• Do not use means to accelerate the defrosting process or to clean, other
than those recommended by the manufacturer.
• The appliance shall be stored in a room without continuously operating ig-
nition sources (for example: open flames, an operating gas appliance or an
operating electric heater).
1.1. Before installation
CAUTION:
• Do not use the unit in an unusual environment. If the air to water heat pump
is installed in areas exposed to steam, volatile oil (including machine oil),
or sulfuric gas, areas exposed to high salt content such as the seaside, or
areas where the unit will be covered by snow, the performance can be sig-
nificantly reduced and the internal parts can be damaged.
• Do not install the unit where combustible gases may leak, be produced,
flow, or accumulate. If combustible gas accumulates around the unit, fire or
explosion may result.
1.2. Before installation (relocation)
CAUTION:
• Be extremely careful when transporting or installing the units. Two or more
persons are needed to handle the unit, as it weighs 20 kg or more. Do not
grasp the packaging bands. Wear protective gloves to remove the unit from
the packaging and to move it, as you can injure your hands on the fins or
the edge of other parts.
• Be sure to safely dispose of the packaging materials. Packaging materials,
such as nails and other metal or wooden parts may cause stabs or other
injuries.
1.3. Before electric work
CAUTION:
• Be sure to install circuit breakers. If not installed, electric shock may result.
• For the power lines, use standard cables of sufficient capacity. Otherwise,
a short circuit, overheating, or fire may result.
• When installing the power lines, do not apply tension to the cables. If the
connections are loosened, the cables can snap or break and overheating or
fire may result.
• Do not pierce or burn.
• Be aware that refrigerants may not contain an odour.
/ Pipe-work shall be protected from physical damage.
• The installation of pipe-work shall be kept to a minimum.
• Compliance with national gas regulations shall be observed.
• Keep any required ventilation openings clear of obstruction.
/ Do not use low temperature solder alloy in case of brazing the refrigerant
pipes.
/ When performing brazing work, be sure to ventilate the room sufficiently.
Make sure that there are no hazardous or flammable materials nearby.
When performing the work in a closed room, small room, or similar location,
make sure that there are no refrigerant leaks before performing the work.
If refrigerant leaks and accumulates, it may ignite or poisonous gases may
be released.
/ The appliance shall be stored in a well-ventilated area where the room size
corresponds to the room area as specified for operation.
/ Keep gas-burning appliances, electric heaters, and other fire sources (igni-
tion sources) away from the location where installation, repair, and other air
to water heat pump work will be performed.
If refrigerant comes into contact with a flame, poisonous gases will be re-
leased.
/ Do not smoke during work and transportation.
/ Do not add the refrigerant more than maximum amount each outdoor units.
If it exceeds the maximum amount of refrigerant, it could result in a fire
when the refrigerant leaks.
• The outdoor unit produces condensation during the heating operation.
Make sure to provide drainage around the outdoor unit if such condensa-
tion is likely to cause damage.
• When installing the unit in a hospital or communications office, be prepared
for noise and electronic interference. Inverters, home appliances, high-
frequency medical equipment, and radio communications equipment can
cause the air to water heat pump to malfunction or breakdown. The air to
water heat pump may also affect medical equipment, disturbing medical
care, and communications equipment, harming the screen display quality.
• The base and attachments of the outdoor unit must be periodically checked
for looseness, cracks or other damage. If such defects are left uncorrected,
the unit may fall down and cause damage or injuries.
• Do not clean the air to water heat pump unit with water. Electric shock may
result.
• Tighten all flare nuts to specification using a torque wrench. If tightened too
much, the flare nut can break after an extended period and refrigerant can
leak out.
• Be sure to ground the unit. Do not connect the ground wire to gas or water
pipes, lightning rods, or telephone grounding lines. If the unit is not prop-
erly grounded, electric shock may result.
• Use circuit breakers (ground fault interrupter, isolating switch (+B fuse),
and molded case circuit breaker) with the specified capacity. If the circuit
breaker capacity is larger than the specified capacity, breakdown or fire
may result.
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