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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.)
• 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.
Selection of copper and heat insulation materials.
7-2
When using commercial copper pipes and fittings, observe the following:
1) Insulation material: Polyethylene foam
Heat transfer rate: 0.041 to 0.052W/mK (0.024-0.030Btu/fth˚F (0.035-0.045kcal/mh˚C))
Refrigerant gas pipe's surface temperature reaches 230˚F (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. 3/8inch (9.5mm)
Minimum bend radius
1-3/16inch (30mm) or more
Thickness 0.031inch (0.8mm) (C1220T-O)
3)
Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
In order to protect the environment, be sure to pump down when relocating or disposing of the unit.
1)
Remove the valve caps from liquid stop valve and gas stop valve.
2) Carry out forced cooling operation.
3) After 5 to 10 minutes, close the liquid stop valve with a
hexagonal wrench.
4) After 2 to 3 minutes, close the gas stop valve and stop
forced cooling operation.
How to force cooling operation mode
Using the indoor unit operation/stop button
Press the indoor unit operation/stop button for at least 5 seconds. (Operation will start.)
• Forced cooling operation will stop automatically after around 15 minutes.
To force a test run to stop, press the indoor unit operation/stop button.
CAUTION
After closing the liquid stop valve, close the gas stop valve within 3 minutes, then stop the forced operation.
Outdoor Unit Installation (3)
Seal the edge of the insulation if
there is a possibility that the
condensation from the shut-off
valve might drip onto the indoor
unit through the gap between the
insulation and the pipe.
Gas pipe thermal
Liquid side
insulation
O.D. 1/4inch (6.4mm)
I.D. 0.472-0.590inch (12-15mm)
Thickness 0.393inch (10mm) Min.
Pump Down Operation
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.
Rain
Piping bundle diagram
Liquid pipe
Liquid pipe insulation
thermal insulation
I.D. 0.315-0.393inch (8-10mm)
Gas stop valve
Filling other cylinders
Turn the cylinder
upside-down when filling.
Be sure to
place a cap.
If no flare cap is
available, cover the
flare mouth with
tape to keep dirt or
water out.
Finishing tape
Inter-unit wiring
Gas pipe
Drain hose
Gas pipe
insulation
Liquid pipe
Close
Liquid stop valve
Wall
Hexagonal
wrench
Valve cap