Toshiba MMD-VN1002HEX1E Installation Manual Download Page 61

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Water supply piping for a humidifier

(VNK type only)

CAUTION

Install the water supply pipes after washing the inside of them with water.

Install a drain valve on the water supply pipe, then drain the water until the drained water runs clear.
Do not to allow cutting fluid or detergent to enter the pipes.
The water quality of the humidifiers supply water should meet public waterworks standards, and have a hardness less
than 100 mg/

ℓ

. If the supply water does not meet these standards, use a deionizer.

NOTE

• If the installation place is subject to freezing, perform anti-freezing work.
• Do not connect the water supply pipe directly to the public water pipe. Use a cistern tank (locally procured).
• Use water which meets the following conditions:

• Water pressure: 2×10

Pa to 49×10

• Water temperature: 5 °C to 40 °C

• Attach a service valve or drain valve (locally procured) near the water intake.

While the humidifier is not in operation, the water inside the pipes and cistern tank does not flow and becomes
stagnant.
If the stagnant water is used for water supply in the initial stages of using the humidifier (heater), a smell may come
out or bacteria may multiply.
If you do not use the humidifier for a long time, drain off water from the pipes and from the cistern tank.
Before the season for using the humidifier (heater) arrives, open the drain / water supply valves to exchange the water
inside the pipes.

• Close the water supply valve when the season for using the humidifier (heater) has passed.
• Prevent corrosive gas, salt, or oil mist from entering the air.
• Clean the strainer for water supply when the season for using the humidifier (heater) arrives.
• Fix the water supply pipes so that excessive force is not applied to them.
• Arrange the pipes so that they do not obstruct opening the maintenance cover for the heat transfer element /

humidification element or removing the humidification element.

• Do not allow cutting fluid from being mixed with the supplying water as it causes the humidifying unit or drain pan to

deteriorate. If cutting fluid sticks to it, wash it immediately in a sufficient amount of water.

• Use 2 wrenches, to connect a pipe to a single union pipe joint or to remove it from the single union pipe joint.
• Drain off water from the cistern tank when the humidifier is not used.

Unit

Heat insulator (for the

water supply pipe)

Water inlet connecting

part size

R1/2

Heat insulator

(for the

strainer)

Service valve

Drain valve

Cap

Installation of ducts

CAUTION

Insulate the ducts to prevent condensation.

Inappropriate installation results in water leaking into the room and furniture may be damaged.
Suction duct length must be longer than 850 mm.



Installing ducts

Insert the duct into the duct connector, then fix the duct using aluminum tape to prevent air from
leaking.

Hang the duct from the ceiling so that excessive force is not applied to the unit.

Leave sufficient space between the room air discharge and the room air intake.

Install 2 ducts to the outside inclined downward between 1/100 and 1/50 so that water does not
enter the ducts.

Insulate 2 ducts to the outside and the SA (supply air) using a heat insulator to prevent
condensation.

(Material of insulator: glass wool, 25 mm thick)

NOTE

• Refrain from the following duct installation works.

• When metallic ducts pass through a wooden construction covered with a metal lath, wire lath, or metal plate, install

the ducts so that they are not electrically in contact with the metal parts of wooden construction.

• Keep the temperature in the ceiling cavity at 5 °C or more; otherwise, freezing and water leakage may occur due to

the built-in humidifier. (VNK type only)

• Even while the unit is not in operation, outside air may enter the room due to a pressure difference between the

outside air and inside air, or outside wind. Using an electric damper is recommended.

• Install a ventilator in the ceiling cavity when it is hot and the humidity is high.
• When the outdoor hood for the air intake is located near a window and small insects gather around the light, they may

get through the pipes and enter the room. Before installation, consider countermeasures such as setting up a filter
box (Locally procured).

• Arrange the pipes so that supply air and exhaust air are not mixed.
• When a vent cap or a round hood for an outdoor hood is used, do not attach the hood to a place where rain may fall

directly. In this case, using a rectangle hood is recommended.

• Stuff the cracks in the pipe penetration part with a noncombustible material such as mortar.

1) Excessive bending

2) Multi-times bending

3) Making the connecting duct

smaller

4) Bending near the exhaust air

duct

Heat insulator

(Insulates the adapter and the aluminium tape)

Outside air intake duct, Air discharge duct

Duct connector