Charging With Refrigerant - Daikin 2MXS52E2V1B Installation Manual

5.
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.
There is a siphon pipe inside, so the
cylinder need not be upside-down to
fill with liquid.
2) Be sure to use the R410A tools to ensure pressure and to prevent foreign objects entering.
6.

Charging with refrigerant

1) If the total length of piping for all rooms exceeds the figure listed below, additionally charge with 20g of refrigerant (R410A)
for each additional meter of piping.
Outdoor capacity class
Total length of piping for all rooms
■ For cooling only
• Cooling only models (3MKS50, 4MKS58) are chargeless. There is no need to charge with refrigerant.
CAUTION
Even though the shut-off valve is fully closed, the refrigerant may slowly leak out; do not leave the flare nut removed for a long
period of time.
7.
Refrigerant piping work
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. (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:
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 dimen-
sions as below.
Pipe size
O.D.: 6.4mm / Thickness: 0.8mm
O.D.: 9.5mm, 12.7mm / Thickness: 0.8mm
O.D.: 15.9mm / Thickness: 1.0mm
3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
■English
Filling other cylinders
2MXS52, 2AMX52, 3MXS52, 3AMX52
30m
Pipe insulation
I.D.: 8–10mm / Thickness: 10mm min.
I.D.: 12–15mm / Thickness: 13mm min.
I.D.: 16–20mm / Thickness: 13mm 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.
Inter-unit wiring
Gas pipe
Gas pipe
insulation
Finishing tape
Wall
Liquid pipe
Liquid pipe
insulation
Drain hose
8