Electrical Work - Mitsubishi Electric City Multi PUMY-P250YBM Installation Manual

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 Use self-extinguishing distribution cables for power supply wiring.
3 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.)
4 Be sure to provide designated grounding work to outdoor unit.
5 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.
6 Never connect the main power source to terminal block of transmission line. If
connected, electrical parts will be burnt out.
7 Use 2-core shield cable for transmission line. If transmission lines of different
systems are wired with the same multiplecore cable, the resultant poor trans-
mitting and receiving will cause erroneous operations.
L1 L2 L3 N
en
TB1
B
A
A Power source
B Power supply for branch box
C Screw on the electrical component box
D Transmission line
K
H
I
J
G Cover panel
H Power supply wire for outdoor unit
I Power supply wire for branch box
J Transmission wire
K Cable clamps
19
E
B1 B2 M1 M2 S M1 M2 S
TB1B TB3 TB7
C
D
F
E Screw on the electrical component box
for ground connection (TB3)
F Screw on the electrical component box
for ground connection (TB7)
G
Fig. 6-1
When connecting wiring to the terminal
block during wiring work, route the wiring
so that it does not come into direct contact
with especially hot parts (such as the 4 way
valve) of the devices inside the outdoor unit.
Fig. 6-2
8 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.
9 In case to connect with centralized 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
connecting to centralized controller, replace the insertion of the short circuit
connector from CN41 of one outdoor unit to CN40.
0 Group is set by operating the remote controller.
6.2. Control box and connecting position of wiring
(Fig. 6-1)
1. Connect the wiring between the outdoor unit and the branch box to the trans-
mission terminal block (TB3) of the outdoor unit.
Connect the wiring between the outdoor unit and the centralized control system
to the transmission terminal block (TB7) of the outdoor unit.
Connect the ground of the shielded wiring to the shield terminal (S) of the
terminal block (TB3) or (TB7).
If the connection of the outdoor unit's transmission power supply connector
has been changed from CN41 to CN42, connect the shield terminal (S) of the
terminal block (TB7) to the screw (F) using the grounding lead wire attached
this manual.
* The shield terminal (S) of the transmission terminal block (TB3) is connected to
the ground (E) when the unit is shipped from the factory.
2. The terminal block (TB1B) is for supplying power to the branch box
(220 V-240 V. max 10A).
3. After removing the knock-out pieces from cover panel G.
Pass the power supply and transmission wires through the knock-out holes.
4. Fix the power supply and transmission wires using clamps K. Refer to Fig. 6-1.
Caution:
Never connect the transmission line for the branch box or the central control
system transmission line to this terminal block (TB1B). If the transmission
lines are connected, the indoor unit terminal block, branch box terminal block
or centralized control terminal block could be damaged.