Wiring (For Details, Refer To The Installation Manual Of Each Indoor/Outdoor Unit And Controller.); Caution; Control Box And Connecting Position Of Wiring - Mitsubishi Electric City Multi PUHY-P-THMU-A Installation Manual

Penetrations
[Fig. 10.4.4]
<A> Inner wall (concealed)
A B
<C> Outer wall (exposed)
E
B
I
<E> Roof pipe shaft
G
D
B
H
F
A Sleeve
C Lagging
E Band
G Sleeve with edge
I Mortar or other incombustible caulking
J Incombustible heat insulation material

11. Wiring (For details, refer to the installation manual of each indoor/outdoor unit and controller.)

11.1. 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 [2 in 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 the outdoor unit.
4 Give some allowance to wiring for the electrical part box on the indoor and
outdoor units, because these boxes are 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 burn out.
6 Use 2-core shield cable for the 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.
7 Only the transmission line specified should be connected to the terminal block
for outdoor unit transmission.
Erroneous connection does not allow the system to operate.
8 When connecting a System Controller to outdoor units or performing a group
operation of indoor units that are connected to different outdoor units, a
transmission line for centralized control is required. When using a transmission
line for centralized control, connect the transmission line (non-polar 2 core
wire) to all TB7 terminals between all outdoor units.
9 Grouping is set by operating the remote controller.
14
(Unit: mm [in])
<B> Outer wall
D
C
A B
<D> Floor (waterproofing)
D
F
G
B
<F> Penetrating portion on fire limit and
boundary wall
I
J
A
1000 1000
[39-3/8] [39-3/8]
B Heat insulating material
D Caulking material
F Waterproofing layer
H Lagging material
When filling a gap with mortar, cover the penetration part with steel plate so that
the insulation material will not be caved in. For this part, use incombustible materi-
als for both insulation and covering. (Vinyl covering should not be used.)
• Insulation materials for the pipes to be added on site must meet the following
specifications:
ø6.35 to 25.4 mm [1/4 to 1 in]
10 mm min. [13/32 in min.]
Thickness
Temperature Resistance
* Installation of pipes in a high-temperature high-humidity environment, such as
the top floor of a building, may require the use of insulation materials thicker
than the ones specified in the chart above.
* When certain specifications presented by the client must be met, ensure that
they also meet the specifications on the chart above.

11.2. Control box and connecting position of wiring

1 Outdoor unit
1. Remove the front panel of the control box by removing the 4 screws and push-
ing it up a little before pulling it out.
2. Connect the indoor - outdoor transmission line to the terminal block (TB3) for
the indoor - outdoor transmission line.
If multiple outdoor units are connected in the same refrigerant system, daisy-
chain TB3 (M1, M2, ground terminal
indoor - outdoor transmission line for the outdoor units to TB3 (M1, M2, ground
terminal ) of only one of the outdoor units.
3. Connect the transmission lines for centralized control (between the centralized
control system and the outdoor unit of different refrigerant systems) to the
terminal block for centralized control (TB7). If the multiple outdoor units are
connected to the same refrigerant system, daisy-chain TB7 (M1, M2, S Termi-
nal) on the outdoor units in the same refrigerant system. (*1)
*1: If TB7 on the outdoor unit in the same refrigerant system is not daisy-
chained, connect the transmission line for centralized control to TB7 on
the OC (*2). If the OC is out of order, or if the centralized control is being
conducted during the power supply shut-off, daisy-chain TB7 on the OC,
OS1 and OS2. (In the case that the outdoor unit whose power supply
connector CN41 on the control board has been replaced with CN40 is out
of order or the power is shut-off, centralized control will not be conducted
even when TB7 is daisy-chained.)
*2: OC, OS1 and OS2 of the outdoor units in the same refrigerant system are
automatically identified. They are identified as OC, OS1 and OS2 in
descending order of capacity. (If the capacity is the same, they will be in
ascending order of their address number.)
4. In the case of indoor-outdoor transmission line, connect the shield ground to
the ground terminal . In the case of transmission lines for centralized con-
trol, connect it to the shield terminal (S) on the terminal block for centralized
control (TB7). Furthermore, in the case of the outdoor units whose power
supply connector CN41 is replaced with CN40, short circuit the shield terminal
(S) and the ground terminal in addition to the above.
5. Fix the connected wires securely in place with the cable strap at the bottom of
the terminal block. External force applied to the terminal block may damage it
and may cause a short circuit, ground fault, or a fire.
Pipe size
ø28.58 to 41.28 mm [1-1/8 to 1-21/32 in]
15 mm min. [19/32 in min.]
100°C min. [212°F min.]
) on the outdoor units. Connect the