Toshiba MMU-AP0091H Installation Manual page 21

[2] Branch header
Branching Header
Select and install the socket that matches the
diameter of a pipe to be connected to the indoor unit.
<Gas-side branch header>
Pipe in use on the site
To outdoor unit
Socket
<Liquid-side branch header>
Pipe in use on the site
To outdoor unit
• If the number of indoor units to be connected is
fewer than the maximum number of units that can
be connected to the branch header, attach a sealed
pipe to the unused connectors.
<Gas-side branch header>
B
A
<Liquid-side branch header>
D
C
• Install the branch header so that it branches
horizontally. It cannot be used in a vertical position.
CAUTION
1. On the inlet side of a Y-type branch joint or branch header, allow for at least 300mm of straight pipe.
2. A Y-type branch joint can be installed so that it branches either vertically or horizontally; if branching
horizontally, it should be within an angle of ±15°.
3. A branch header should be installed so that it branches horizontally.
4. Do not use T-type branch joints.
CAUTION
In the multi air conditioning system, because the refrigerant pipes congregate at the rooftop pipeshaft outlet
in the vertical pipeshaft, it is necessary to attach "labels" to each pipe in order to make clear to which system
a given pipe belongs so as to prevent pipes from being connected incorrectly.
Socket
Pipe in use on the site
To indoor unit
Socket
Pipe in use
on the site
To indoor unit
Socket
Outlet sealed pipe
(Provided with
branch header)
Outlet sealed pipe
(Provided with
branch header)
<Gas-side>
(Horizontal line)
(Horizontal line)
<Liquid-side>
(Horizontal line)
When arranging the branching header at the liquid
side, attach a header sealed pipe on the sealing side
of the header as shown in the fiqure at below.
Be sure to install the branch pipe downward.
Horizontal viewed from D point should be within ± 10
degrees same as view B.
• Supporting branching header
After applying the insulation, set the hanging metals
as support. (in use on the site).
NOTE :
1. Install the branching header so that it branches
horizontally. It cannot be used in a vertical
position.
2. Do not use T-type pipe for the branching section.
Inlet socket
Branching Header
Pipe in use
(D view) Sealing side
on the site
21
Within
± 15 degrees
(A view)
Within
± 10 degrees
(B view)
Within
± 15 degrees
(C view)
Header sealed pipe
Within
± 10 degrees