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3.1. Checking the accessories with BC con-

troller

The following items are supplied with each BC controller.

Distance between MAIN BC controller
and farthest indoor unit

Height difference between
MAIN BC controller and
farthest indoor unit (m)

20
10

Distance between MAIN BC controller

and farthest indoor unit (m)

70
60
50
40
30

4.1. Connecting refrigerant pipes

1. Connect the liquid and gas pipes of each indoor unit to the same (correct) end

connection numbers as indicated on the indoor unit connection section of each
BC controller. If connected to wrong end connection numbers, there will be no
normal operation.

2. List indoor unit model names in the name plate on the BC controller control

box (for identification purposes), and BC controller end connection numbers
and address numbers in the name plate on the indoor unit side.

3. If the number of ports is greater than the number of indoor units to be connected,

use any ports.

Seal unused end connections using cover caps just as they were capped when
shipped from the factory. Not replacing on end cap will lead to refrigerant leak-age.

4. When using CMY-Y102S-G2, CMY-Y102L-G2, or CMY-Y202-G2, connect it

horizontally.

5. Be sure to have pipe expansion of indoor unit connecting port by cutting the

piping at the cutting point which depends on the indoor unit capacity.

Note:

Remove burr after cutting the piping to prevent entering the piping.
Check that there is no crack at the pipe expansion part.

[Fig. 4.1.1] (P.5)

Indoor unit connecting port

Cutting point : ø9.52 (Liquid side) or ø15.88 (Gas side)

(Indoor unit model : bigger than P50)

Cutting point : ø6.35 (Liquid side) or ø12.7 (Gas side)

(Indoor unit model : P50 or smaller)

Cut the piping at the cutting point

Have pipe expansion of indoor unit connecting port

Field pipe

4. Connecting refrigerant pipes and drain pipes

3.2. Installing BC controllers

Installing hanging bolts

Install locally procured hanging bolts (threaded rod) following the procedure given
in the figure. The hanging bolt size is ø10 (M10 screw).
To hang the unit, use a lifting machine to lift and pass it through the hanging bolts.
Suspension bracket has an oval hole. Use a large diameter washer.

[Fig. 3.2.1] (P.4)

Hanging method

A: Min.30 mm

Hanging bolt ø10 (field supply)

Washer (field supply)

Be sure to install the BC controller horizontally, using a level. If the
controller is installed at an angle, drain water may leak out. If the controller
is slanted, loosen the fixing nuts on the hanging brackets to adjust its
position.

Caution:

Be sure to install the unit horizontally.

Length

(Unit: m)

Item

Piping portion

Allowable value

F+G+A+B+C

Total piping length

+D+E+a+b

+c+d+e+f

Longest piping length

F(G)+A+C+E+f

Between outdoor unit and

F(G)+A

Below 110

BC controller

Between indoor units and BC controller B+d or C+D+e or C+E+f

Below 40 *2

Between outdoor units

F+G

Below 5

Above outdoor unit

Below 50

Below outdoor unit

H’

Below 40

Between indoor units and BC controller

Below 15

(Below 10)*3

Between indoor units

Below 15

(Below 10)*3

Between BC controller (main or sub)

Below 15

and BC controller (sub)

Between outdoor units

Below 0.1

Dif

ference of elevation

Between

indoor and

outdoor units

Not to exceed the

maximum refriger-

ant piping length *1

165 m or less

(Equivalent length

of 190 m or less)

Notes:

A system that has more than 16 branching points requires 2 to 3 BC control-
lers (main and sub) and 3 pipes to connect the main and the sub BC control-
lers.
*1 Refer to “Restrictions on piping length” on P. 4.
*2 Please refer to the figure “Distance between main BC controller and far-

thest Indoor unit” when the distance between main BC controller and
farthest indoor unit exceeds 40 m. (Not applicable to the P250 model
indoor unit)

*3 The values in the parentheses show the maximum piping length to be

followed when the connection capacity of the indoor unit is 200 or more.

*4 In the system to which indoor units of the P200 model or above are con-

nected, neither a branch joint nor a branch header may be used.

*5 When connecting two sub BC controllers, the total piping length must be

equal to or less than the maximum length as listed in on the left.

*6 When connecting two sub BC controllers, install them in parallel.

*7 In the system to which indoor units of the P100 through P140 models are

connected, merge the two ports before connecting them. (Set DIP SW4-6
on the BC controller to ON.)

*8 It is possible to connect the P100 through P140 models of indoor units to

a single port. (Set DIP SW4-6 to OFF.) Note that the cooling capacity will
somewhat decrease. (The factory setting for DIP SW4-6 is OFF.)

*9 When the outdoor unit is 28-hp (P700 model) or more, use the HA-type

main BC controller. The G-type BC controller cannot be connected to the
models between 16-hp (P400 model) and 26-hp (P650 model), and the G-
and GA-type BC controllers cannot be connected to the 28-hp (P650
model) or more.

*10 For Sub BC controller GB type, the connectable indoor unit capacities

may sum to equal that of a P350 unit or less. However, if two sub control-
lers are used the TOTAL sum of connectable units connected to BOTH
sub controllers must also not exceed that of a P350 unit.
For sub BC controller HB type, the connectable indoor unit capacities
may sum to equal that or a P350 unit or less. However, if two sub control-
lers are used the TOTAL sum of connectable units connected to BOTH
sub controllers must also not exceed that of a P450 unit.

*11 Indoor units that are connected to the same branch joint cannot be si-

multaneously operated in different operation modes.

*12 Do not connect the P200 or P250 models of indoor units and other mod-

els of indoor units at the same port.

3. Installing BC controller

Drain hose

Tie band

Hose band

Refrigerant

connection pipe

Item

Qty