8
4.6. Additional refrigerant charge
Refrigerant of 3 kg equivalent to 50 m total extended piping length is already included
when the outdoor unit is shipped. Thus, if the total extended piping length is 50 m or
less, there is no need to charge with additional refrigerant.
Calculation of Additional Refrigerant Charge
• If the total extended piping length exceeds 50 m, calculate the required additional
refrigerant charge using the procedure shown below.
• If the calculated additional refrigerant charge is a negative amount, do not charge
with any refrigerant.
<Example>
Outdoor model : 125
Indoor 1 : 63
A : ø9.52
30 m
a : ø9.52
15 m
2 : 40
b : ø6.35
10 m
3 : 25
c : ø6.35
10 m
4 : 20
d : ø6.35
20 m
The total length of each liquid line is as follows
ø9.52 : A + a = 30 + 15 = 45 m
ø6.35 : b + c + d = 10 + 10 + 20 = 40 m
Therefore,
<Calculation example>
Additional
refrigerant charge = 45
×
0.06 + 40
×
0.024 – 3.0 = 0.7 kg (rounded up)
Refrigerant
amount for
outdoor unit
3.0 kg
Liquid pipe size
Total length of
ø6.35
×
0.024
(m)
×
0.024 (kg/m)
Additional
refrigerant charge
(kg)
Liquid pipe size
Total length of
ø9.52
×
0.06
(m)
×
0.06 (kg/m)
=
+
–
<Additional Charge>
4. Installing the refrigerant piping
5. Drainage piping work
Outdoor unit drainage pipe connection
When drain piping is necessary, use the drain socket or the drain pan (option).
P100-140
Drain socket
PAC-SG61DS-E
Drain pan
PAC-SG64DP-E
6.1. Caution
1
Follow ordinance of your governmental organization for technical standard re-
lated to electrical equipment, wiring regulations and guidance of each electric
power company.
2
Wiring for control (hereinafter referred to as transmission line) shall be (5 cm or
more) apart from power source wiring so that it is not influenced by electric noise
from power source wiring. (Do not insert transmission line and power source wire
in the same conduit.)
3
Be sure to provide designated grounding work to outdoor unit.
4
Give some allowance to wiring for electrical part box of indoor and outdoor units,
because the box is sometimes removed at the time of service work.
5
Never connect the main power source to terminal block of transmission line. If
connected, electrical parts will be burnt out.
6
Use 2-core shield cable for transmission line. If transmission lines of different
systems are wired with the same multiplecore cable, the resultant poor transmit-
ting and receiving will cause erroneous operations.
6. Electrical work
7
Only the transmission line specified should be connected to the terminal block for
outdoor unit transmission.
(Transmission line to be connected with indoor unit : Terminal block TB3 for trans-
mission line, Other : Terminal block TB7 for centralized control)
Erroneous connection does not allow the system to operate.
8
In case to connect with the upper class controller or to conduct group operation in
different refrigerant systems, the control line for transmission is required between
the outdoor units each other.
Connect this control line between the terminal blocks for centralized control. (2-
wire line with no polarity)
When conducting group operation in different refrigerant systems without con-
necting to the upper class controller, replace the insertion of the short circuit
connector from CN41 of one outdoor unit to CN40.
9
Group is set by operating the remote controller.
2
Wiring examples
• Controller name, symbol and allowable number of controllers.
2. M-NET Remote control cables
Kind of remote control cable
Cable diameter
Remarks
Shielding wire MVVS
0.5 to 1.25 mm
2
When 10 m is exceeded, use cable with the
same specifications as transmission line wiring
A
: Power source
B
: Transmission line
Name
Outdoor unit controller
Indoor unit controller
Remote controller
Symbol
OC
IC
RC
(M-NET)
MA
Allowable number of controllers
One to eight controllers for one OC
Maximum of 16 controllers for one
OC
Maximum of two per group
6.2. Control box and connecting position of wiring
(Fig. 6-1)
1. Connect the indoor unit transmission line to transmission terminal block (TB3), or
connect the wiring between outdoor units or the wiring with the centralized con-
trol system to the centralized control terminal block (TB7).
When using shielded wiring, connect shield ground of the indoor unit transmis-
sion line to the earth screw (
) and connect shield ground of the line between
outdoor units and the central control system transmission line to the shield (S)
terminal of the centralized control terminal block (TB7) shield (S) terminal. In
addition, in the case of outdoor units whose power supply connector CN41 has
been replaced by CN40, the shield terminal (S) of terminal block (TB7) of the
centralized control system should also be connected to the ground (
).
2. Conduit mounting plates (ø27) are being provided. Pass the power supply and
transmission wires through the appropriate knock-out holes, then remove the
knock-out piece from the bottom of the terminal box and connect the wires.
3. Fix power source wiring to terminal box by using buffer bushing for tensile force
(PG connection or the like).
6.3. Wiring transmission cables
1
Types of control cables
1. Wiring transmission cables
• Types of transmission cables: Shielding wire CVVS or CPEVS
• Cable diameter: More than 1.25 mm
2
• Maximum wiring length: Within 200 m
Fig. 6-1
At the conditions
below:
M1
S
M2
A
B
M1
S
M2
L1 L2 L3 N
TB3
TB7
3. MA Remote control cables
Kind of remote control cable
Cable diameter
2-core cable (unshielded)
0.3 to 1.25 mm
2
