Daikin Quaternity H-Series Specifications download pdf (Page 38)

EDUS04-906_b Installation Manual

Room Air Conditioners H-Series 37

Outdoor Unit Installation (3)

Pump Down Operation

7. Refrigerant piping work.

7-1 Cautions on pipe handling.

1) Protect the open end of the pipe against dust and moisture.

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 (0.024-0.030Btu/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.

In order to protect the environment, be sure to pump down when relocating or disposing of the unit.

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.

3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.

• Be sure to use the R410A tools to ensure pressure and to prevent foreign objects entering.

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.

Before filling, check whether the cylinder has a siphon attached or not.

(It should have something like “liquid filling siphon attached” displayed on it.)

After closing the liquid stop valve, close the gas stop valve within 3 minutes, then stop the forced operation.

CAUTION

Thickness 0.031inch (0.8mm) (C1220T-O)

Minimum bend radius

1-3/16inch (30mm) or more Thickness 0.393inch (10mm) Min.

O.D. 1/4inch (6.4mm)

I.D. 0.315-0.393inch (8-10mm)

O.D. 3/8inch (9.5mm)

I.D. 0.472-0.590inch (12-15mm)

Gas side Liquid side

Gas pipe thermal

insulation

Liquid pipe

thermal insulation

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.

Filling other cylinders

Turn the cylinder

upside-down when filling.

Wall

If no flare cap is

available, cover the

flare mouth with

tape to keep dirt or

water out.

Be sure to

place a cap.

Rain

Liquid stop valve

Valve cap

Hexagonal

wrench

Gas stop valve

Piping bundle diagram

Finishing tape

Liquid pipe insulation

Inter-unit wiring

Gas pipe

insulation

Gas pipe

Drain hose

Liquid pipe

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.

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Daikin Quaternity H-Series Specifications Page 38

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