Daikin RXB25B6V1 Installation Manual page 10

Outdoor Unit Installation
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
Stand the cylinder upright when
filling.
• 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 (0.035 to 0.045kcal/(mh •°C))
Refrigerant gas pipe's surface temperature reaches 110°C max.
Choose heat insulation materials that will withstand this temperature.
2) Be sure to insulate both the gas and liquid piping and to provide insulation
dimensions as below.
Gas side
O.D. 9.5mm
Minimum bend radius
Thickness 0.8mm (C1220T-O)
3) Use separate thermal insulation for gas and liquid refrigerant pipes.
7
There is a siphon pipe inside, so the
cylinder need not be upside-down to
fill with liquid.
Liquid side
O.D. 6.4mm
30mm or more
Filling other cylinders
Gas pipe Liquid pipe
thermal insulation thermal insulation
I.D. 12-15mm I.D. 8-10mm
Thickness 10mm Min.
Turn the cylinder upside-down
when filling.
Be sure to
place a cap.
Rain
If no flare cap is
available, cover
the flare mouth
with tape to keep
dirt or water out.
Gas pipe
Gas pipe
insulation
Finishing tape
Wall
Inter-unit wiring
Liquid pipe
Liquid pipe
insulation
Drain hose
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