Instructions For Branching Pipe Set (Dis-Wa1,Wb1,Ta1,Tb1) - Mitsubishi Electric FDT125VNVF Technical Manual

INSTRUCTIONS FOR BRANCHING PIPE SET INSTALLATION FOR TWIN/TRIPLE/ W-TWIN CONFIGURATION SYSTEMS
1.10.5 Instructions for branching pipe set (DIS-WA1, WB1, TA1, TB1)
For R410A
● This set is for R410A refrigerant.
● Select a branching pipe set correctly rated for the combined total capacity of connected indoor units and install it according to this manual.
An improperly installed branching pipe set can cause degraded performance or an abnormal unit stop.
● Provide good heat insulation to the pipes by following instructions contained in this manual.
Improper heat insulation can result in degraded performance or a water leak accident from condensation.
● Please make sure that only parts supplied as accessories or the manufacturer's approved parts are used in installing the unit, because a leak of refrigerant can
result in a lack-of-oxygen accident, if it reaches a concentration beyond the tolerable limit.
This manual explains how to use a branching pipe set that is indispensable in connecting pipes for a twin/triple/W-twin configuration installation (system). For the
details of piping work, unit installation work and electrical installation work, please refer to the installation manuals and installation guides supplied with your outdoor
and indoor units.
1. Branching pipe set specifications
(1) Please make sure that you have chosen the right branching pipe set and the specifications of the parts contained in it by checking with the table below.
(2) Connect pipes as illustrated in the table below. The pipe from an outdoor unit must be brazed to the pipe connection port "①" and the pipes from indoor units to
"②," "③" and "④."
Supported outdoor/indoor unit combinations
Branching pipe set type
Outdoor unit model Indoor unit model
3HP
4HP
DIS-WA1
5HP
(Two-way branching set)
6HP
8HP
DIS-WB1
(Two-way branching set)
10HP
DIS-TA1
6HP
(Three-way branching set)
DIS-TB1
8HP
(Three-way branching set)
(3) To connect pipes for a W-twin installation (involving 4 indoor units), please see 2-7. "W-twin configuration." Double Twin installation (involving 4 indoor units), please see 2-7. "Double Twin configuration."
(4) A branching pipe set must always be installed into the posture as illustrated in the drawing below.
＜Posture to install into＞
Two-way branching
Three-way branching
2. Pipe connecting procedure
Braze the different diameter pipe joint found in the set matching the connected outdoor and indoor unit capacities according to the instructions set out below.
In connecting an indoor unit of which capacity is 1.5HP, 2HP or 2.5HP, always use a φ9.52 liquid pipe to connect to the branching
CAUTION
pipe (branching pipe – indoor unit).
In connecting to an indoor unit (liquid pipe side:φ6.35), use the different diameter pipe joint A supplied with the set and follow the
procedure set out below.
WARNING / CAUTION
Branching pipe set for a liquid pipe Branching pipe set for a gas pipe
1.5HP＋1.5HP
ID9.52
2HP＋2HP
②
1.5HP＋2.5HP
①
2.5HP＋2.5HP
2HP＋3HP
③
ID9.52
3HP＋3HP ID9.52
1 piece
2HP＋4HP
ID9.52
4HP＋4HP
②
①
3HP＋5HP
③
ID12.7
ID9.52
5HP＋5HP
1 piece
ID9.52
②
①
2HP＋2HP＋2HP
③
④
ID9.52
1 piece
ID9.52
②
①
3HP＋3HP＋3HP
③
④
ID9.52
1 piece
Install it to make the
lie parallel to the floor.
Brazing
Liquid connecting pipe (φ9.52) Joint A
-
Part lists
Different diameter pipe joint
ID15.88
ID9.52
②
①
(for indoor unit side connection)
③
ID15.88
ID15.88
OD15.88
1 piece
ID15.88
②
①
OD12.7
③
ID25.4
ID15.88
1 piece
ID12.7
①
ID9.52
② ③ ④
ID15.88 (for indoor unit side connection)
1 piece
ID15.88
ID9.52
Flare joint (for indoor unit side connection)
①
② ③ ④
OD15.88
ID25.4
1 piece
ID12.7
Floor surface
Floor surface
part
Floor surface Floor surface
Flarenutφ6.35
To indoor unit liquid pipe connection port
290
-
'12 • PAC-T-174
PSB012D865
PSB012D865
Heat insulation material
Joint A
2 pieces
Flare joint
Joint B
2 pieces
ID12.7
One each for liquid and gas
Joint C 1 piece
ID9.52
One each for liquid and gas
Joint A
3 pieces
Flare joint
One each for liquid and gas
Joint A
2 pieces
Joint B
1 piece
ID12.7
Joint D
1 piece
One each for liquid and gas
OD9.52
ID stands for inner diameter and OD, outer diameter.
Install it to make the part
lie perpendicular to the floor.
2-1 D
Supp
Outdoor unit
g
F
3HP
4HP
5HP
6HP
Note Wh
use
2-5. Tri
Wh
Outdo
Floor surface
Floor surface