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90
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1.2.2 Range of usage & limitations
Models
Item
151, 201, 251
302~602
802, 1002
Indoor return air temperature
(Upper, lower limits)
Refer to the selection chart
(see page 126)
Please see the next page.
Outdoor air temperature
(Upper, lower limits)
Operating temperature
When used under -5˚C, install a snow hood (option). (302~1002 only)
Indoor unit atmosphere (behind ceiling)
temperature and humidity
Dew point temperature: 28˚C or less, relative humidity: 80% or less
Refrigerant line (one way) length
Max. 40m
Max. 50m
Max. 70m*
Vertical height difference between outdoor unit and
indoor unit
Max. 30m (Outdoor unit is higher)
Max. 15m (Outdoor unit is lower)
Difference in after branch piping lengths between
indoor units
–
Max. 20m
Max. 30m
Difference in height between indoor units
–
Max. 0.5m
Installation site
The outline drawing contains restrictions concerning the installation space. Install the
indoor unit 2.5m or above higher than the fl oor surface.
Power source voltage
Rating ± 10%
Voltage at starting
Min. 85% of rating
Compressor
ON-OFF
Frequency
Cycle Time
7 minutes or more (from OFF to OFF) or (from ON to ON)
Stop Time
3 minutes or more
Note (1) Do not install the unit at the following places.
• Places exposed to oil splashes or steam (e.g. kitchens and machine plants).
• Places where infl ammable gas may leak.
• Places containing a great amount of sulfi de gases (e.g. hot spring area).
• Places directly exposed to sea breeze (e.g. coastal area).
• Places containing acid or alkaline air.
• Places adjacent to equipment generating electromagnetic waves or high-frequency waves.
• Places sucking the exhaust gas from heat exchanger.
• Do not install the unit on an object moistened with water.
• Places where carbon fi ber and metal particles, powder, etc. are fl oating.
• Places where chimney smoke is hanging.
• Places at an elevation of 1000m and above.
• Places splashed with water (laundry room, etc.).
• The indoor unit is not protected against water penetration.
• Do not install indoor units of twin, triple and double-twin specifi cations separately in a room with partition.
(2) If ambient temperature and humidity exceed the above values, please add polyurethane foam insulation to the outer plate (t10 and above).
(3) Please set the lower limit of one-way piping length to 5m and above.
(4)
When
φ
22.22 gas pipe is used for piping lengths with the * mark, let the maximum one-way length be 30m.
