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Function module installation locations

Install the function module indoors, in a room other than the bathroom.

Please leave a space of at least 24 inches (600 mm) in front of the equipment so that inspections or
repairs can be made. Also, please do not locate it on a second-story wall or other place without ac-
cess.

Please take the following into consideration when deciding where to place the function module. The
length of the cables to the equipment (pumps and the like) that will be installed with the bathtub are
49 ft (15m).

If the tub installation is downstairs the function module should be
within 23 ft (7 m) of the top of the tub.

If the tub installation is upstairs the function module should be
within 23 ft (7 m) of the top of the tub. In this case the supplied
water pressure should be 29 psi (0.20 MPa) above head pres-
sure.

Be sure to install it on a vertical wall.

The plumbing that is connected to the equipment should be in-
stalled so that there will be no safety problems with respect to
earthquakes, other vibration or physical impact and caulking ma-
terial should be used to seal the points where the hot and cold
water and the power lines pass through the walls.
Precautions when plumbing

If the plumbing materials are specified by the relevant local and national plumbing authorities, com-
ply with those specifications.

Be sure to flush filings, sand and debris from inside the pipes using water before connecting the
function module.

Use a union junction or similar means on the connection port and do not use excessive force.

The diameter of the pipe is not to be less than the diameter of the function module connector (NPT
3/4).

When the water pressure is high, either install a pressure-reducing valve or a device to prevent
"water hammer". (Recommended water pressure: 29 to 108.75 psi (0.20 to 0.75 MPa) However,
limits set by local and national plumbing authorities should not be exceeded.)

Keep the number of unions as small as possible and do not use complicated plumbing. Additionally,
do not plumb in such a way that air can become trapped in the pipes.
Hot and cold water supply plumbing

Install an anti-backwash valve, a shut-off valve or a shut-off valve with an anti-backwash valve near
the hot and cold water supply ports.

In order for the customer to have a pleasant experience using this equipment, a hot and cold water
supply pressure of 29 to 108.75 psi (0.20 to 0.75 MPa) is required. If the water pressure is low, the
equipment will not function properly and could lead to trouble with the customer, so be prepared to
install a booster pump as a countermeasure.
Fill-tub plumbing

The pipes that are used with the fill-tub feature are to have a maximum length of 49 ft (15m) and 10
changes of direction.

Please incline the pipes so that it will be easier to remove water from the pipes when draining water
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