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14
Vacuum Mode
This function is used for creating vacuum in the system after compres-
sor replacement, ODU parts replacement or IDU addition/replacement.
Vacuum mode setting method
Main PCB
ODU power reset
SW01S
Main PCB
Main PCB DIP switch ON ( No.11,14)
SW02B
Main PCB
Press the black button Main PCB (5 sec.)
SW01V
Vacuum mode setting
ODU V/V OPEN
Main EEV, SC EEV OPEN
IDU EEV OPEN
Vacuum mode cancellation method
Main PCB DIP switch OFF( No.11,14)
Vacuum mode cancellation
CAUTION
!
ODU operation stops during vacuum mode. Compressor can't
operate.
Heat 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.
Power reset
Adhesive + Heat - resistant poly-
ethylene foam + Adhesive tape
Indoor
Vinyl tape
Floor
Water-proof hemp cloth +
exposed
Bronze asphalt
Water-proof hemp cloth +
Outdoor
Zinc plate + Oily paint
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
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
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.)
Ⓐ 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
Outer wall (exposed)
B
A
I
Roof pipe shaft
I
G
D
B
H
A
F
1m
1m
Ⓖ Sleeve with edge
Ⓗ Lagging material
Ⓘ Mortar or other incombustible
caulking
Ⓙ Incombustible heat insulation ma-
terial
E
B
J
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