Toshiba R410A Connecting method of the duct, Supply air side <Round duct>, Square duct, b

Installation reference (Example for RAV-SM801BT model)

The air supply ducting work is classified in two ways, one is branched by the round ducts, and the other is branched by the square ducts. (Be sure to divide the air supply duct into three or more branches.)

<Round duct>

In case of the round duct, use the thermal insulator of thickness 25mm or more and inner diameter 150mm or more to the duct board.

(If the inner diameter is not enough, resistance increase, as the result, air does not flow smoothly and loss of the static pressure increases.) For the thermal insulator, use high-density glass wool of 24kg/m3 or equivalent.

<Square duct> (Reference for square duct)

When using the square duct, change the type of the air supply flange from round type to square flange at the local site.

In case of the square duct, apply the thermal insulator of thickness 25mm or more to the duct board. For the thermal insulator, use high-density glass wool of

25mm or more

Density of thermal insulator (glass wool) is 24 kg/m³ or equivalent.

weight 64kg/m3.

Ø150mm or more

Connecting method of the duct

1. Supply air side <Round duct>

Thermal insulator	Thermal insulator
with sticking material
	at indoor unit side
(50mm-width, 6mm-thickness)
	Stuck already at
Aluminum tape	(shipment from the factory)
(Seal : 50mm-width)

Duct board	Density of thermal
	insulator (glass wool) is
	64 kg/m³ or equivalent.
	25mm or more

<Square duct>

Thermal insulator with	Thermal insulator
sticking material
(50mm-width, 6mm (t))	at indoor unit side
	Stuck already at
Aluminum tape	(shipment from the factory)
(Seal : 50mm-width)

Fit to the arrow direction by pushing.

Round duct
Thermal insulator	Flange
25mm-thickness,
(24kg/m³ or equivalent )

Screws

(6 pieces)

Seal/thermal insulator with sticking material (25mm-width, 6mm (t))

Fit to the arrow direction by pushing.

Attach by pushing to the arrow direction. (Outside corner direction)

Square duct board

(25mm-thickness, )

Screws

(6 pieces)

Indoor unit side

Flange (procured locally)

Seal/thermal insulator with sticking material (25mm-width, 6mm (t))

Fit the seal/thermal insulator (25mm-width, 6mm-thickness) by pushing to the arrow direction so that no gap can be found between the flange and the round duct.

Fig. 2 (a)

64kg/m³ or equivalent

Fig. 2 (b)

CAUTION

Incomplete thermal insulation of the supply air flange and sealing may cause dew drops.

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