Daikin FTXN09KEVJU Operation Manual page 76

EDUS041111_a
6.
Refilling the refrigerant
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.
1) Before filling, check whether the cylinder has a siphon attached or not. (It should have something like "liquid filling siphon
attached" displayed on it.)
Filling a cylinder with an attached siphon
• Be sure to use the R410A tools to ensure pressure and to prevent foreign objects entering.
7.
Refrigerant piping work
7-1 Cautions on pipe handling
1) Protect the open end of the pipe against dust and moisture.
2) All pipe bends should be as gentle as possible. Use a pipe bender
for bending.
7-2 Selection of copper and heat insulation materials
When using commercial copper pipes and fittings, observe the following:
1) Insulation material: Polyethylene foam
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.
O.D. 3/8 inch
Thickness 0.031 inch (0.8mm) (C1220T-O)
3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
Room Air Conditioners K-Series
Stand the cylinder upright when
filling.
There is a siphon pipe inside, so the
cylinder need not be upside-down to
fill with liquid.
Gas side Liquid side
O.D. 1/4 inch
(9.5mm) (6.4mm)
Minimum bend radius
1-3/16 inch (30mm) or more
Filling other cylinders
Turn the cylinder upside-down
when filling.
Rain
Gas pipe Liquid pipe
thermal insulation thermal insulation
I.D. 0.472-0.591 inch I.D. 0.315-0.393 inch
(12-15mm) (8-10mm)
Thickness 0.393 inch (10mm) Min.
Installation Manual
Wall
Be sure to
place a cap.
If no flare cap is
available, cover
the flare mouth
with tape to keep
dirt or water out.
Inter-unit wire
Gas pipe
Liquid pipe
Gas pipe
Liquid pipe
insulation
insulation
Finishing tape
Drain hose
75