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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 poly-
ethylene, so that no gap is observed in the joint between indoor unit
and insulating material, and insulating materials themselves. When in-
sulation work is insufficient, there is a possibility of condensation drip,
etc. Pay special attention to insulation work to ceiling plenum.
Heat insulation
material
Outer
covering
Ⓐ Heat insulation material
Ⓑ Pipe
Ⓒ Outer covering(Wind the connection part and cutting part of heat in-
sulation material with a finishing tape.)
NOTE
!
When using polyethylene cover as covering material, asphalt roof-
ing shall not be required.
Bad example
• Do not insulate gas or low pressure pipe and liquid or highpres-
sure pipe together.
A
C
D
E
• Be sure to fully insulate connecting portion.
A
Ⓐ These parts are not insulated.
Good example
C
Power lines
D
D
A
B
E
Adhesive + Heat - resistant poly-
ethylene foam + Adhesive tape
Indoor
Vinyl tape
Floor ex-
Water-proof hemp cloth +
posed
Bronze asphalt
Water-proof hemp cloth +
Outdoor
Zinc plate + Oily paint
Ⓐ Liquid pipe
Ⓑ Gas pipe
ⓒ Power lines
ⓓ Finishing tape
ⓔ Insulating material
ⓕ Communication lines
Communication lines
Ⓐ Liquid pipe
Ⓑ Gas pipe
ⓒ Power lines
ⓓ Insulating material
ⓔ Communication lines
Separation
Penetrations
Inner wall (concealed)
Outer wall
D
C
A
B
Floor (fireproofing)
Penetrating portion on fire
limit and boundary wall
D
F
G
B
Ⓐ Sleeve
Ⓑ Heat insulating material
Ⓒ Lagging
Ⓓ Caulking material
Ⓔ Band
Ⓕ Waterproofing layer
Ⓖ Sleeve with edge
Ⓗ Lagging material
Ⓘ Mortar or other incombustible caulking
Ⓙ 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 incom-
bustible materials for both insulation and covering. (Vinyl covering should not
be used.)
ELECTRICAL WIRING
Caution
- Follow ordinance of your governmental organization for technical
standard related to electrical equipment, wiring regulations and guid-
ance of each electric power company.
WARNING
!
Be sure to have authorized electrical engineers do the electric
work using special circuits in accordance with regulations and this
installation manual.
If power supply circuit has a lack of capacity or electric work defi-
ciency, it may cause an electric shock or fire.
- Install the Outdoor Unit communication cable away from the power
source wiring so that it is not affected by electric noise from the power
source. (Do not run it through the same conduit.)
- Be sure to provide designated grounding work to Outdoor Unit.
CAUTION
!
Be sure to correct the outdoor unit to earth. Do not connect ground
wire to any gas pipe, liquid pipe, lightening rod or telephone earth
line. If earth is incomplete, it may cause an electric shock.
- 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.
- Never connect the main power source to terminal block of communi-
cation cable. If connected, electrical parts will be burnt out.
- Use 2-core shield cable for communication cable.(O mark in the figure
below) If communication cable of different systems are wired with
the same multiplecore cable, the resultant poor transmitting and re-
ceiving will cause erroneous operations. (
below)
- Only the communication cable specified should be connected to the
terminal block for Outdoor Unit communication.
Outer wall (exposed)
E
B
A
I
Roof pipe shaft
I
G
D
B
H
A
1m
1m
mark in the figure
21
B
J
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