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•
To keep the piping from becoming clogged with dirt,
avoid bends where possible and install so that traps can
be cleaned.
At least
4 in.
At least
3 in.
•
Observe the following guidelines when installing con-
centrated drain piping. Select the thickness of the
concentrated drain piping to refl ect the capacity of the
machine to which it will be connected. (Install a drain
trap for each indoor unit.) (Refer to Fig. 8)
At least 4 in.
Concentrated drain piping
Fig. 8
(Use a downward slope of at least 1/100.)
CAUTION
•
Water accumulating in the drain piping can cause the drain
to clog.
〈PRECAUTIONS〉
Drain piping connections
•
Do not connect the drain piping directly to sewage piping
that smell of ammonia. The ammonia in the sewage might
enter the indoor unit through the drain piping and corrode
the heat exchanger.
•
Do not twist or bend the drain hose, as excessive force may
cause it to leak.
(2)
After piping work is fi nished, check drainage fl ows
smoothly.
•
Gradually insert approximately 1 quart of water into the
drain pan to check drainage in the manner described
below.
7.
INSTALLING THE DUCT
Exercise care regarding the following when performing duct
work.
•
Verify that duct work does not exceed the unit's setting range
of external static pressure (up to 0.5 Wg at "H" speed).
•
Install canvas ducts at air outlets and inlets so that vibrations
from the main unit are not transmitted to ducts or the fl oor.
Additionally, line the duct with sound-absorbing material
(heat insulation material) as necessary.
•
Be sure to install a optional air fi lter to the product's air inlet
or to a fi eld-supplied air inlet inside the air passage on the
suction side.
•
Perform the curing and other work during duct welding so
that the inside of the product is not exposed to spatter.
English
Air handler
Fig. 7
•
If the metal duct passes through a metal lath, wire lath, or
metal plate of a wooden structure, isolate the duct from the
wall electrically.
•
Be sure to heat-insulate the duct to prevent the formation of
condensation. (Material: Glass wool or polyethylene foam;
thickness: 1 inch.)
•
Explain to the customer how to operate and clean fi eld-
supplied components such as air fi lters, air inlet grilles, air
outlet grilles.
•
To prevent drafts, locate the air outlet grille on the indoor
side so that warm air from the outlet does not come into
direct contact with room occupants.
•
When an electric heater (optional) is installed, use metal
duct and wrap the duct with a glass-wool insulation material.
8.
ELECTRIC WIRING WORK
8-1
GENERAL INSTRUCTIONS
•
Shut off the power before doing any work.
•
All fi eld supplied parts and materials, electric works must
conform to local codes.
•
Use copper wire only.
•
See also the "Wiring Diagram Label" located inside the unit's
fan housing.
•
For details on hooking up the remote controller, refer to the
"REMOTE CONTROLLER INSTALLATION MANUAL"
•
All wiring must be performed by an authorized electrician.
•
This system consists of multiple indoor units. Mark each
indoor unit as unit A, unit B . . . , and be sure the terminal
board wiring to the outdoor unit and Branch Selector unit are
properly matched. If wiring and piping between the outdoor
unit and an indoor unit are mismatched, the system may
cause a malfunction.
•
Install a wiring interrupter or ground-fault circuit interrupter
for the power wiring.
•
Make sure the ground resistance is no greater than 100
•
To avoid short circuiting the power supply wire, be sure to
use insulated terminals.
•
Do not turn on the power supply (wiring interrupter or
ground-fault circuit interrupter) until all other work is done.
DANGER
•
Do not ground units to water piping, telephone wires or
lightning rods because incomplete grounding could cause a
severe shock hazard resulting in severe injury or death, nor
to gas piping because a gas leak could result in an explo-
sion which could lead to severe injury or death.
8-2
LIST OF STANDARD WIRING EQUIPMENT
Power supply wiring
(including ground wire)
Field fuses
Size
Must comply
15A
with local
codes.
Ω.
Transmission wiring
Remote controller wiring
Wire
Size
2-conductor,
stranded, non-
AWG18 – 16
shielded copper/
PVC or vinyl jacket
8
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