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Contents
1. Safety precautions .............................................. 1
2. Installation location .............................................. 3
3. Installing the outdoor unit ......................................... 4
4. Installing the refrigerant piping ..................................... 5
5. Drainage piping work ............................................ 7
6. Electrical work .................................................. 7
7. Test run ....................................................... 9
8. Special functions ............................................... 10
9. System control (Fig. 9-1) ......................................... 11
10. Low ambient cooling ............................................ 11
1. Safety precautions
► Before installing the unit, make sure you read all the “Safety precau-
tions”.
► Please report to or take consent by the supply authority before connec-
tion to the system.
After installation work has been completed, explain the “Safety precautions,”
use,and maintenance of the unit to the customer according to the information in the
Operation Manual and perform the test run to ensure normal operation. Both the
Installation Manual and Operation Manual must be given to the user for keeping.
These manuals must be passed on to subsequent users.
: Indicates a part which must be grounded.
Warning:
Carefully read the labels afxed to the main unit.
Warning:
• The unit must not be installed by the user. Ask a dealer or an authorized
technician to install the unit. If the unit is installed incorrectly, water leakage,
electric shock, or re may result.
• For installation work, follow the instructions in the Installation Manual and
use tools and pipe components specically made for use with R410A re-
frigerant. The R410A refrigerant in the HFC system is pressurized 1.6 times
the pressure of usual refrigerants. If pipe components not designed for
R410A refrigerant are used and the unit is not installed correctly, the pipes
may burst and cause damage or injuries. In addition, water leakage, electric
shock, or re may result.
• The unit must be installed according to the instructions in order to minimize
the risk of damage from earthquakes, typhoons, or strong winds. An incor-
rectly installed unit may fall down and cause damage or injuries.
• The unit must be securely installed on a structure that can sustain its weight.
If the unit is mounted on an unstable structure, it may fall down and cause
damage or injuries.
• If the air conditioner is installed in a small room, measures must be taken to
prevent the refrigerant concentration in the room from exceeding the safety
limit in the event of refrigerant leakage. Consult a dealer regarding the ap-
propriate measures to prevent the allowable concentration from being ex-
ceeded. Should the refrigerant leak and cause the concentration limit to be
exceeded, hazards due to lack of oxygen in the room may result.
• Ventilate the room if refrigerant leaks during operation. If refrigerant comes
into contact with a ame, poisonous gases will be released.
• All electric work must be performed by a qualied technician according to
local regulations and the instructions given in this manual. The units must
be powered by dedicated power lines and the correct voltage and circuit
breakers must be used. Power lines with insufcient capacity or incorrect
electrical work may result in electric shock or re.
• Use C1220 copper phosphorus, for copper and copper alloy seamless pipes,
to connect the refrigerant pipes. If the pipes are not connected correctly, the
unit will not be properly grounded and electric shock may result.
•
U
se only specied cables for wiring. The wiring connections must be made
securely with no tension applied on the terminal connections. Also, never
splice
the cables for wiring (unless otherwise indicated in this document).
Failure to observe these instructions may result in overheating or a re.
• The terminal block cover panel of the outdoor unit must be rmly attached. If
the cover panel is mounted incorrectly and dust and moisture enter the unit,
electric shock or re may result.
• When installing or relocating, or servicing the air conditioner, use only the
specified refrigerant (R410A) 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 in-
stalled, water leakage, electric shock, or re may result.
• Do not alter the unit. Consult a dealer for repairs. If alterations or repairs are
not performed correctly, water leakage, electric shock, or re may result.
• The user should never attempt to repair the unit or transfer it to another loca-
tion. If the unit is installed incorrectly, water leakage, electric shock, or re
may result. If the air conditioner must be repaired or moved, ask a dealer or
an authorized technician.
• After installation has been completed, check for refrigerant leaks. If refriger-
ant leaks into the room and comes into contact with the ame of a heater or
portable cooking range, poisonous gases will be released.
• When opening or closing the valve below freezing temperatures, refriger-
ant may spurt out from the gap between the valve stem and the valve body,
resulting in injuries.
• Do not perform pump down work when there is a gas leak. The intake of air
or other gases causes abnormally high pressure in the refrigeration cycle,
which may cause explosion or injury.
1.1. Before installation
Caution:
• Do not use the unit in an unusual environment. If the air conditioner is in-
stalled in areas exposed to steam, volatile oil (including machine oil), or sul-
furic 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 signicantly
reduced and the internal parts can be damaged.
• Do not install the unit where combustible gases may leak, be produced, ow,
or accumulate. If combustible gas accumulates around the unit, re or explo-
sion may result.
• The outdoor unit produces condensation during the heating operation. Make
sure to provide drainage around the outdoor unit if such condensation is
likely to cause damage.
Warning:
Describes precautions that must be observed to prevent danger of injury or
death to the user.
Caution:
Describes precautions that must be observed to prevent damage to the unit.
• When installing the unit in a hospital or communications ofce, be prepared
for noise and electronic interference. Inverters, home appliances, high-
frequency medical equipment, and radio communications equipment can
cause the air conditioner to malfunction or breakdown. The air conditioner
may also affect medical equipment, disturbing medical care, and communi-
cations equipment, harming the screen display quality.
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