Thermal Insulation Of Refrigerant Piping; Wiring; Caution; Wiring And Fitting Capacities - Mitsubishi Electric PUH-P10MYA Installation Manual

8.4. Thermal insulation of refrigerant piping

Be sure to give insulation work to refrigerant piping by covering liquid pipe and gas
pipe separately with enough thickness heat-resistant polyethylene, so that no gap
is observed in the joint between indoor unit and insulating material, and insulating
materials themselves. When insulation work is insufficient, there is a possibility of
condensation drip, etc. Pay special attention to insulation work to ceiling plenum.
[Fig. 8.4.1] (P.3)
A Steel wire
C Asphaltic oily mastic or asphalt
E Outer covering B
Heat Glass fiber + Steel wire
insulation
Adhesive + Heat - resistant polyethylene foam + Adhesive tape
material A
Indoor Vinyl tape
Outer
Floor exposed Water-proof hemp cloth + Bronze asphalt
covering B
Water-proof hemp cloth + Zinc plate + Oily
Outdoor
paint
Note:
• When using polyethylene cover as covering material, asphalt roofing shall
not be required.
• No heat insulation must be provided for electric wires.

9. Wiring

9.1. 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 Set up the outdoor unit so that the wiring for the remote controller and the M-
NET (MELANS) wiring do not produce electrical interference with the power
supply cable. (Do not route them together 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 In the indoor/outdoor connection wiring, the power and signals wiring are con-
tained in the same multiconductor cable. Since the cable is polarized, be sure
the connection is according to the terminal number.
6 For detailed information about the power supply cable, see the manual sup-
plied with the indoor unit.

9.2. Wiring and fitting capacities

(1) PUH-P8, 10
Main power supply wire thickness and switch capacities.
Power supply thickness *1
Overcurrent protector *2
Thickness of wires for remote control-
ler and indoor unit *1
Thickness of wire between indoor and
outdoor unit
Thickness of wire between outdoor and
outdoor unit (connecting with PEH-P16, 20)
Ground wire thickness
Notes:
*1: "Power supply thickness" indicates the thinnest allowable metal wire.
*2: "Overcurrent protector" indications are for when class B fuse are used.
*3: These wires are supplied with optional remote controller and branch pip-
ing.
*4: Power supply codes of parts of appliances for outdoor use shall not be
lighter than polychloroprene sheathed flexible cord (design 245 IEC 57).
*5: A switch with at least 3 mm contact separation in each pole shall be pro-
vided by the Air conditioner installation.
B Piping
D Heat insulation material A
PUH-P8 PUH-P10
mm 2 4 or more 6 or more
A 32 40
mm 2 0.8 or more *3
mm 2 1.5 or more
mm 2
0.75 or more
2
mm 4 or more 6 or more
[Fig. 8.4.2] (P.3)
A Liquid pipe B Gas pipe
D Finishing tape E Insulater
[Fig. 8.4.3] (P.3)
Penetrations
[Fig. 8.4.4] (P.3)
<A> Inner wall (concealed)
<C> Outer wall (exposed)
<E> Roof pipe shaft
<F> Penetrating portion on fire limit and boundary wall
A Sleeve
C Lagging
E Band
G Sleeve with edge
I Mortar or other incombustible caulking
J Incombustible heat insulation 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 mate-
rials for both insulation and covering. (Vinyl covering should not be used.)
Warning:
Always use the designated cable for wiring, and connect it correctly. Secure
it so that the cable applies no external pressure to the terminal connection. If
the connection is faulty or the cable is not fully secured, overheating or fire
could result.
Caution:
• Depending on the location of the unit, a current leakage breaker may be
required. If a current leakage breaker is not installed, electric shock could
result.
• Do not use breakers or fuses with a capacity different from the correct
one. If large-capacity fuses, wire, or copper wiring are used, accident or
fire may result.
Table above is an example. The selection of other capacities should be deter-
mined in accordance with the relevant standards.
Types of cable/cord
• Vinyl cab tire round cord: VCTF
• Vinyl insulating vinyl sheath cable round type: VVR
• Vinyl cab tire flat cord: VCTFK
• Vinyl insulating vinyl sheath cable flat type: VVF
• Vinyl insulating vinyl sheath cable for control: CVV
• 600 V vinyl cab tire cable: VCT
• Vinyl insulating vinyl sheath cable for control: CVS
Warning:
Be sure to use specified cables and connect them firmly so that no external
wiring force is exerted on terminal connections. Loose connections may cause
heat or fire.
Caution:
• Some installation sites may required installation of an earth leakage
breaker. Failure to install it may result in an electric shock.
• Always use an earth leakage breaker and fuse with the specified capac-
ity. Use of a fuse with a capacity larger than that specified, or use of a
piece of wire or copper wire may cause breakdown or fire.
C
Electric wire
<B> Outer wall
<D> Floor (fireproofing)
B Heat insulating material
D Caulking material
F Waterproofing laye
H Lagging material
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