English
6
NOTE
Do not use fl ux when brazing refrigerant piping. Therefore,
•
use the phosphor copper brazing fi ller metal (BCuP) which
does not require fl ux.
(Flux has an extremely negative effect on refrigerant piping
systems. For instance, if chlorine based fl ux is used, it will
cause pipe corrosion. Flux containing fl uorine will damage
refrigerant oil.)
DRAIN PIPING WORK
6.
CAUTION
Make sure all water is out before making the duct connection.
•
Install drain piping as described below.
(1)
Perform drain work so that the unit is drained thoroughly.
•
(Be sure to insulate the following 2 locations since
condensation may cause water leakage.)
Drain piping indoors
•
Drain socket
•
The drain pan has connections for a primary and sec-
•
ondary drain (see diagram below).
Use 3/4 PVC pipe for drain pipe connections.
•
Keep pipe runs short with a downward slope of at least
•
1/100 so that there is no air bank.
Be sure to install a drain trap at the drain outlet since
•
the inside of the unit is at negative pressure relative to
atmospheric pressure during operation (see diagram
below).
To keep the piping from becoming clogged with dirt,
•
avoid bends where possible and install so that traps can
be cleaned.
Min. 2 in.
Min. 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.)
At least 4 in.
Concentrated drain piping
(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 pipes 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, so that excessive force
•
is not applied to it.
(This type of treatment may cause leaking.)
After piping work is fi nished, check drainage fl ows
(2)
smoothly.
Gradually insert approximately 1 L of water into the drain
•
pan to check drainage in the manner described below.
INSTALLING THE DUCT
7.
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 in.).
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 option 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.
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 (air fi lters, air inlet grilles, air outlet grilles, etc.).
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.
ELECTRIC WIRING WORK
8.
GENERAL INSTRUCTIONS
8-1
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 BS 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
•
Ω
.
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.
01_EN_3P250363-1.indd 6
01_EN_3P250363-1.indd 6
6/18/2009 2:01:16 PM
6/18/2009 2:01:16 PM
