Trane 4TXM2318BF300AA Service Manual page 94

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.)
2) Be sure to use the R410A tools to ensure pressure
and to prevent foreign objects entering.
6. Charging with refrigerant
1) This system must use refrigerant R410A.
2) Add refrigerant 20g per meter when the total piping
length exceeds the standard value, but make sure
that the total liquid piping length should be less
than the max. value. 5U45LS1ERA charge 28g/m
refrigerant for extra pipe length
Notes:
1) When using this product, you need not to set the address. But the L/N wires between indoor & outdoor units
must be corresponded, or there will be communication failure.
2) Quiet operation setting. Set the DIP "8" to ON position of SW5, the system will run with lower noise, but the max.
capacity will also reduce slightly.
3) Do not change the settings of other switches, wrong settings can make the system damage or other
malfunctions.
7. Precautions for Laying Refrigerant
• Piping 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(0.035to 0.045kcal/mhoC) Refrigerant gas pipe's surface temperature
reaches 110oC 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 pipe
O.D.:9.52mm,12.7mm Thickness:0.8mm
Liquid pipe
O.D.:6.35mm Thickness:0.8mm
Outdoor unit
liquid piping length
4TXM2318BF300AA
4TXM2324BF300AA
4TXM2330BF400AA
4TXM2336BF500AA
4TXM2342BF500AA
Gas pipe insulation
I.D.:12-15mm,12.7mm Thickness:13mm min.
Liquid pipe insulation
I.D.:18-10mm Thickness:10mm min.
92
Standard total Max. total liquid
piping lenght
30m 30m
30m 50m
40m 50m
40m 80m
40m 80m