Special Notes - Hitachi FSG1 Series Technical Catalogue

MISCELLANEOUS NOTES
20
/2

20.1 SPECIAL NOTES

1. Provide a service access door near the unit piping
connection part on the false ceiling for the cassette type
units.
2. Consider the air distribution from the unit to the space of
the room, and select a suitable location so that uniform
air temperature in the room can be obtained. Cassette
and Ceiling Types - Avoid unit installation in a room
where the ceiling height (distance between the floor to
the false ceiling) exceeds three meters. If the indoor unit
is installed in a room with a ceiling of higher than 3
meters, it is recommended that an air circulation fan be
installed separately to obtain uniform air temperature in
the room, especially during the heating operation.
3. Check to ensure that the ceiling slab is strong enough
and that the false ceiling is flat and level.
4. Avoid obstacles which may restrict the air intake or the
discharge flow.
5. Do not install the unit in a machinery shop or kitchen
where vapor from oil or its mist can enter to the unit. The
oil will deposit on the heat exchanger, thereby reducing
the unit performance, and may deform, in the worst case,
break the plastic parts of the unit.
6. Pay attention to the following points when the unit is
installed in a hospital or other facilities where
electromagnetic wave is radiated from medical
equipment.
a. Do not install the unit where the electromagnetic wave
is directly radiated to the electrical box, remote control
cable or remote control switch.
b. Install the unit and component as far as practical (at
least three meters) from the electromagnetic wave
radiator.
c. Prepare a steel box and install the remote control
switch in it. Prepare a steel conduit pipe and wire the
remote control cable in it. Then, connect earth wire
with the box and the pipe.
d. Install a noise filter when the power supply emits
harmful noise.
7. Do not install the units in an acid or alkaline environment
due to the corrosive action on the heat exchanger. In the
case that outdoor units are installed near the sea, it is
recommended that optional corrosion - resistant type
outdoor unit be used.
8. Do not install the units in an flammable environment due
to the danger of an explosion.
9. Regarding cassette type indoor units, consider the direct
and reflected sound level, when selecting the unit for
spaces where extremely low sound is required.
10. During heating operation, the outdoor heat exchanger
produces condensate dew or melting water from frost.
Install the outdoor unit where drainage of such water is
convenient, or provide a drain passage.
11. Heating Performance: The heating capacity normally
decreases when outdoor temperatures decrease.
Therefore, provide an auxiliary heating unit if outdoor
temperatures are very low.
12. In the case that an outdoor temperature is low and
humidity is high, the outdoor heat exchanger will covered
with frost, resulting in lower heating capacity. In order to
remove the frost, the unit is automatically changed to the
defrosting mode. During this defrosting operation, the unit
is stopped for approximately 3 to 10 minutes.
13. As this unit is of heat pump type by circulating hot air in
the whole room space, it takes time to heat up the room
temperature.
14. The operating sound data is based on an anechoic
chamber. Therefore, the actual operating sound will be
higher due to reflected sound from the floor and wall.
15. In the case that the unit is operated for a long time
higher than the indoor temperature of 27°C DB or the
humidity of 80%, dewing may occur on the cabinets
resulting in dew drops. If dewing, it is required to add
thermal insulator on the cabinets.
16. Provide snow-protection hoods to prevent the outdoor
heat exchanger from snow clogging. If the unit is
operated in an are where it snows heavily, provide a
base under the outdoor unit which should be 50 cm
higher than the presumable maximum snow height.
17. It is recommended that periodical service and
maintenance be performed by authorized service
engineers before air conditioning seasons, in order to
avoid performance decrease due to dust or dirt.
18. This heat pump air conditioner has been designed for
normal air conditioning for men. Do not apply other
purposes such as for food, animals, plants, high precision
machines or work of art. Also do not apply to vehicles or
vessels. It will results in water leakage or electrical
leakage.
19. It is recommended that the system be installed by
authorized engineers. If not, it may cause water leakage,
electric shock or fire.
20. In a place where fibers or dust are floating, the air filter
or heat exchangers or the drain pipe may be clogged,
resulting in water leakage from the drain pan.