8
English
Outdoor Unit Installation
Re
fi
lling the refrigerant
6.
Check the type of refrigerant to be used on the machine nameplate.
Precautions when adding R410A
Fill from the liquid pipe in liquid form.
It is a mixed refrigerant, so adding it in gas form may cause the refrigerant composition to change, preventing normal operation.
Before
fi
lling, check whether the cylinder has a siphon attached or not. (It should have something like “liquid
fi
lling
1)
siphon attached” displayed on it.)
Filling a cylinder with an attached siphon
Stand the cylinder upright when
filling.
There is a siphon pipe inside, so the
cylinder need not be upside-down to
fill with liquid.
Filling other cylinders
Turn the cylinder upside-down
when filling.
Be sure to use the R410A tools to ensure pressure and to prevent foreign objects entering.
•
Refrigerant piping work
7.
7-1 Caution on pipe handling
Protect the open end of the pipe against dust and moisture.
1)
All pipe bends should be as gentle as possible. Use a pipe bender for
2)
bending.
Selection of copper and heat insulation materials
7-2
When using commercial copper pipes and
fi
ttings, observe the following:
Insulation material: Polyethylene foam
1)
Heat transfer rate: 0.041 to 0.052W/mK (0.024 to 0.030Btu/fth°F (0.035 to 0.045kcal/mh°C))
Refrigerant gas pipe’s surface temperature reaches 230°F (110°C) max.
Choose heat insulation materials that will withstand this temperature.
2) Be sure to insulate both the gas and liquid piping and to provide insulation
dimensions as below.
Gas side
Liquid side
Gas pipe thermal
insulation
Liquid pipe thermal
insulation
O.D. 1/2 inch
(12.7mm)
O.D. 1/4 inch
(6.4mm)
I.D. 0.551-0.630 inch
(14-16mm)
I.D. 0.315-0.393 inch
(8-10mm)
Minimum bend radius
Thickness 0.393 inch (10mm) Min.
1-9/16 inch (40mm)
or more
1-3/16 inch (30mm)
or more
Thickness 0.031 inch (0.8mm) (C1220T-O)
Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
•
Wall
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
Gas pipe
Liquid pipe
Gas pipe
insulation
Liquid pipe
insulation
Finishing tape
Drain hose
Inter-unit wire
01_EN_3P273470-2.indd 8
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1/6/2011 12:04:46 PM
1/6/2011 12:04:46 PM
