English
9
REFRIGERANT PIPING WORK
Caution
Be sure to insulate any field piping all the way to the piping connection inside the unit. Any exposed piping may cause
condensation or burns if touched.
Cautions on Pipe Handling
• Protect the open end of the pipe against dust and moisture.
(Tighten both edges with clamp.)
• All pipe bends should be as gentle as possible. Use a pipe bender for
bending.
(Bending radius should be 30 to 40mm or larger.)
Selection of Copper and Heat Insulation materials
When using commercial copper pipes and fittings, observe the following:
• Insulation material: Polyethylene foam
Heat transfer rate: 0.041 to 0.052W/mK (0.035 to 0.045kcal/mh°C)
Refrigerant gas pipe’s surface temperature reaches 110°C max.
Choose heat insulation materials that will withstand this temperature.
• Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as below.
Also, when subject to high humidity, heat insulation of the refrigerant
piping (the unit piping and branch piping) must be further reinforced.
Reinforce the insulation when installing the unit near bathrooms,
kitchens, and other similar locations.
Refer to the following:
• 30°C, more than 75% RH: 20mm Min. in thickness
If the insulation is not sufficient, condensation may form on the surface
of the insulation.
• Use separate thermal insulation pipes for gas and liquid refrigerant
pipes.
Main unit
Wrap the sealing
tape around the
gas pipe.
(accessory)
Measure the length of the gas
pipe as you will have to cover it
with the sealing tape.
Small sealing pad
Main unit
(accessory)
Gas Piping Insulation Procedure
Piping insulation material
(Field supplied)
Clamp
(accessory)
Insulation for fitting
Turn seams up
Flare nut connection
Attach to base
Piping insulation
material (main unit)
Liquid Piping Insulation Procedure
Insulation for fitting
(accessory)
Main unit
Attach to base
Piping insulation
material (main unit)
Piping insulation material
(Field supplied)
Turn seams up
Flare nut connection
Clamp (accessory)
Liquid pipe
Gas pipe
If no flare cap is
available, cover
the flare mouth
with tape to keep
dirt or water out.
Be sure to
place a cap.
Rain
Wall
Thickness 10mm min.
I.D. 8-10mm
O.D. 6.4mm
Thickness 0.8mm
I.D. 14-16mm
I.D. 12-15mm
50/60 class
25/35 class
O.D. 12.7mm
O.D. 9.5mm
50/60 class
25/35 class
Liquid pipe
thermal insulation
Liquid side
Gas pipe thermal insulation
Gas side
Inter-unit wiring
Drain hose
Finishing tape
Liquid pipe insulation
Gas pipe insulation
Liquid pipe
Gas pipe
Содержание FNQ25A2VEB
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