Refilling Refrigerant; Refrigerant Piping Work - Daikin RX15RMVJU Installation Instructions Manual

6.

Refilling 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.
R410A 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
Stand the cylinder upright when filling.
There is a siphon pipe inside, so the cylinder
need not be upside-down to fill with liquid.
• 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
• Protect the open end of the pipe from dust and moisture.
• 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:
• 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))
Be sure to use insulation that is designed for use with HVAC Systems.
• ACR Copper only.
• Be sure to insulate both the gas and liquid piping and observe the
insulation dimensions as below.
Gas side
Liquid side
• Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
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English
Piping size Minimum bend radius
O.D. 3/8 inch 1-3/16 inch (30mm)
(9.5mm) or more
O.D. 1/2 inch 1-9/16 inch (40mm)
(12.7mm) or more
O.D. 5/8 inch 1-15/16 inch (50mm)
(15.9mm) or more
O.D. 1/4 inch 1-3/16 inch (30mm)
(6.4mm) or more
Filling other cylinders
Turn the cylinder
upside-down when filling.
Rain
Piping thickness Thermal insulation size
I.D. 15/32-19/32 inch
(12-15mm)
0.031 inch (0.8mm)
(C1220T-O)
I.D. 9/16-5/8 inch
(14-16mm)
0.039 inch (1.0mm) I.D. 5/8-13/16 inch
(C1220T-O) (16-20mm)
0.031 inch (0.8mm) I.D. 5/16-13/32 inch
(C1220T-O) (8-10mm)
Gas pipe
Gas pipe
insulation
Wall
Be sure to
place a cap.
If no flare cap is
available, cover
the flare mouth
with tape to keep
dirt and water out.
Thermal insulation
thickness
13/32 inch
(10mm) Min.
Liquid pipe
Liquid pipe
insulation
Finishing tape
Drain hose
8