Duct Work - Daikin VAM-FA Technical Data Manual

13 Installation

13 - 7 Duct Work

13 - 7 - 1Caution
• Do not install ducts as shown below.
1
(1) Extreme bend
Do not bend the duct over 90
13
(3) Reduce the diameter of the duct to be connected.
Do not reduce the duct diameter halfway.
1. To prevent air leakage, wind aluminum tape round the section
after the duct connecting flange and the duct are connected.
2. Install the opening of the indoor air intake as far as from the
opening of the exhaust suction.
3. Use the duct applicable to the model of unit used (Refer to the
outline drawing.)
4. Install the two outdoor ducts with down slope (slope of 1 / 50 or
more) to prevent entry of rain water. Also, provide insulation for
both ducts to prevent dew formation. (Material: Glass wool of 25
mm thick)
Body
Aluminum tape
(Field supply)
5. If the level of temperature and humidity inside the ceiling is always
high install a ventilation equipment inside the ceiling.
6. Insulate the duct and the wall electrically when a metal duct is to
be penetrated through the metal lattice and wire lattice or metal
lining of a wooden structure wall.
13 - 7 - 2Going through the external wall
1. Hole diameter
Duct dia. + 50 or 75
(I.D. depends on the core drill specification)
<e.g.>
Duct diameter
φ 100 + 50
54
• Heat reclaim ventilation • VAM-FA/FB
(2) Multi bend
°
C.
(HC0077)
(HC0078)
Insulator
(Field supply)
Slope: Over 1 / 50
Duct connecting flange
(HC0079)
Hole diameter
φ 150
• Ventilation • Heat reclaim ventilation
φ 150 + 50
2. Drilling the hole
Ideally it is better to grade in the same procedure as refrigerant
piping.
In the case of a square duct
Grade a wood frame of a duct stay.
In the case of a round duct
Drill a hole horizontally because the hole cannot be made with the
tool graded.
3. Preventing wind and rain from entering
Most of a space between the duct and the external wall is
protected by mortar. Coated wall is filled with a caulking material.
(See fig. 1)
Image picture
Fig. 1
Indoor External
wall
1 / 100 – 1 / 50
Spiral duct
(A flexible duct is not used in the
through part of the external wall)
4. How about the building which has already been built?
Same as the newly-built building.
• Only hole diameter 100 is instructed in a drawing by a drawing
company, so a detailed work is executed by the judgement of an
installation company.
φ 200
(HC0080)
Outdoor
Mortar
Hood
Caulking material
(Sealing material)
Spiral duct
(HC0081)