Haier AD35S2SM3FA - Page 191

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Disconnect charging hose from gas stop valve's service port, then fully open liquid and gas stop valves. (Do not
attempt to turn valve rod beyond its stop.)
Tighten valve caps and service port caps for the liquid and gas stop valves with a torque wrench at the specied
torques. See "3 Refrigerant piping" on page 23 for details.
5. Relling the Refrigerant
Check the type of refrigerant to be used on the machine nameplate.
Precautions when adding R32.
Fill from the liquid pipe in liquid form.(recommend)
1) Before lling, check whether the cylinder has a siphon attached or not. (It should have something like "liquid
lling siphon attached" displayed on it.) (recommend)
2) Be sure to use the R32 tools to ensure pressure and to prevent foreign objects entering.
6. Charging with Refrigerant
1) This system must use refrigerant R32.
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.
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 ttings, observe the following:
1) Insulation material: Polyethylene foam
Heat transfer rate: 0.041 to 0.052W/mK (0.035 to 0.045kcal/mh
o
C) Refrigerant gas pipe's surface temperature
reaches 110
o
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.
Outdoor Unit Standard Total liquid Piping lengrh Max. Total liquid Piping length
3U55S2SR2FA 30m 50m
3U70S2SR2FA 30m 60m
4U75S2SR2FA 40m 70m
4U85S2SR2FA 40m 70m
5U105S2SS2FA 40m 80m
Gas Pipe Gas Pipe Insulation
O.D.: 9.52mm,12.7mm
Thickness: 0.8mm
I.D.: 12-15mm, 12.7mm
Thickness: 13mm min.
Liquid Pipe Liquid Pipe Insulation
O.D.: 6.35mm
Thickness: 0.8mm
I.D.: 18-10mm
Thickness: 10mm min.
Filling a cylinder with an attacged siphon
Filling other cylinders.
Turn the cylinder upside-down
when filing.
Stand the cylinder upright when filling.
There is a siphon pipe inside, so the
cylinder need not be upside-down to
fill with liquid.