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English
8. DUCT WORK
Pay the utmost attention to the following items and con-
duct the ductwork.
•
Check that the duct is not in excess of the setting range of
external static pressure for the unit. (Refer to the technical
datasheet for the setting range.)
•
Attach a canvas duct each to the air outlet and air inlet so
that the vibration of the equipment will not be transmitted to
the duct or ceiling.
Use a sound-absorbing material (insulation material) for the
lining of the duct and apply vibration insulation rubber to the
hanging bolts.
•
At the time of duct welding, perform the curing of the duct
so that the sputter will not come in contact with the drain
pan for the filter.
•
If the metal duct passes through a metal lath, wire lath, or
plate of a wooden structure, separate the duct and wall
electrically.
•
Be sure to heat insulate the duct for the prevention of dew
condensation. (Material: Glass wool or styrene foam; Thick-
ness: 31/32 in. (25 mm))
•
Be sure to attach the field supply air filter to the air inlet of
the unit or field supply inlet in the air passage on the air suc
-
tion side. (Be sure to select an air filter with a duct collection
efficiency of 50 weight percent.)
•
Explain the operation and washing methods of the locally
procured components (i.e., the air filter, air inlet grille, and
air outlet grille) to the customer.
•
Locate the air outlet grille on the indoor side for the pre-
vention of drafts in a position where indirect contact with
people.
•
The air conditioner incorporates a function to adjust the fan
to rated speed automatically.
(10. FIELD SETTING)
Therefore, do not use booster fans midway in the duct.
Connection method of ducts on air inlet and outlet sides.
•
Connect the field supply duct in alignment with the inner
side of the flange.
•
Connect the flange and unit with the flange connection screw
(3).
•
Wrap aluminum tape around the flange and duct joint in
order to prevent air leakage.
Unit
Insulation material
(field supply)
Canvas duct
(field supply)
Flange on air inlet side
(provided with the unit)
Insulation material
(field supply)
Air inlet
Air outlet
Screws for duct
flanges (3)
(accessory)
Screws
for duct
flanges (3)
(accessory)
Flange on air outlet side
(provided with the unit)
Fig. 20
CAUTION
Connect the flange and unit with the flange connection
screw (3) regardless of whether the duct is connected to
the air inlet side.
9. ELECTRIC WIRING WORK
9-1 GENERAL INSTRUCTIONS
•
Make certain that all electric wiring work is carried out by
qualified personnel according to the applicable legislation
and this installation manual, using a separate dedicated
circuit.
Insufficient capacity of the power supply circuit or improper
electrical construction may lead to electric shocks or a fire.
•
Make sure to install an ground leakage breaker.
Failure to do so may cause electric shocks and a fire.
•
Do not turn on the power supply (branch switch, branch
overcurrent circuit breaker) until all the works are finished.
•
Multiple number of indoor units are connected to one out-
door unit. Name each indoor unit as A-unit, B-unit ….. and
the like. When these indoor units are wired to the outdoor
unit and the Branch Selector unit, always wire the indoor
unit to the terminal indicated with the same symbol on the
terminal block. If the wiring and the piping are connected
to the different indoor units and operated, it will result in
malfunction.
•
Make sure to ground the air conditioner.
Grounding resistance should be according to applicable
legislation.
•
Do not connect the ground wiring to gas or water pipings,
lightning conductor or telephone ground wiring.
•
Gas piping .................
Ignition or explosion may occur if
the gas leaks.
•
Water piping ..............Hard vinyl tubes are not effective
grounds.
•
Lightning conductor or telephone ground wiring .............
Electric potential may rise abnormally if struck by a light-
ning bolt.
•
For electric wiring work, refer to also the “WIRING DIA-
GRAM” attached to the control box lid.
•
Carry out wiring between the outdoor units, indoor units
and the remote controllers according to the wiring diagram.
•
Carry out installation and wiring of the remote controller ac-
cording to the “installation manual” attached to the remote
controller.
•
Do not touch the Printed Circuit Board assembly. It may
cause malfunction.
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