Mitsubishi Electric CITY MULTI PUMY-P112 Manual De Instalación página 11

4. Installing the refrigerant piping
4.8. Additional refrigerant charge
Additional refrigerant charge
Refrigerant for the extended piping is not included in the outdoor unit when the unit is
shipped from the factory. Therefore, charge each refrigerant piping system with addi-
tional refrigerant at the installation site. In addition, in order to carry out service, enter
the size and length of each liquid pipe and additional refrigerant charge amounts in
the spaces provided on the "Refrigerant amount" plate on the outdoor unit.
Calculation of additional refrigerant charge
• Calculate the additional charge using the liquid pipe size and length of the ex-
tended piping and total capacity of connected indoor units.
• Calculate the additional refrigerant charge using the procedure shown to the right,
and charge with the additional refrigerant.
• For amounts less than 0.1 kg, round up the calculated additional refrigerant
charge.
(For example, if the calculated charge is 6.01 kg, round up the charge to 6.1 kg.)
5. Drainage piping work
Outdoor unit drainage pipe connection
When drain piping is necessary, use the drain socket or the drain pan (option).
Drain socket
Drain pan
6. Electrical work
6.1. Caution
1 Follow ordinance of your governmental organization for technical standard related
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.
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
transmission line, Other : Terminal block TB7 for centralized control)
Erroneous connection does not allow the system to operate.
P112-140
PAC-SG61DS-E
PAC-SH97DP-E
<Additional Charge>
Calculation of refrigerant charge
Pipe size Pipe size
Liquid pipe Liquid pipe
+
ø6.35 ø9.52
(m) × 19.0 (g/m) (m) × 50.0 (g/m)
Included refrigerant amount when shipped from the factory
Included refrigerant amount
4.8 kg
<Example>
Outdoor model : P125
Indoor 1 : P63 (7.1 kW) A : ø9.52 30 m a : ø9.52 15 m
2 : P40 (4.5 kW)
3 : P25 (2.8 kW)
4 : P20 (2.2 kW)
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
The total capacity of connected indoor unit is as follows:
7.1 + 4.5 + 2.8 + 2.2 = 16.6
<Calculation example>
Additional refrigerant charge
19.0 50.0
40 × + 45 × + 3.0 = 6.1 kg (rounded up)
1000 1000
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 connect-
ing 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.
0 When connecting the CONNECTION KIT (PAC-LV11M-J) and an M-series indoor
unit, refer to the installation manual for the CONNECTION KIT.
A When connecting a branch box, be sure to turn on the indoor units and the branch
box before turning on the outdoor unit.
Total capacity of Amount for the
connected indoor units indoor units
+
~ 8.0 kW 1.5 kg
8.1 ~ 16.0 kW 2.5 kg
16.1 kW ~ 3.0 kg
b : ø6.35 10 m At the conditions
c : ø6.35 10 m below:
d : ø6.35 20 m
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