Bedienungsanleitung Midea MCDD-Serie (Seite 17 von 25) (Englisch)

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CAUTION

-76 c mHg

Lo-lev er

Hi-leve r

Charg e hos e

Vac uum p ump

Lo-lev er

Manifo ld valv e

Multi-m eter

Pressu re meter

Fig.8-7

Additional Refrigerant Charge

8.3

Refrigerant cannot be charged until field wiring has been

completed.

Refrigerant may only be charged after performing the leak

test and the vacuum pumping.

When charging a system, care shall be taken that its

maximum permissible charge is never exceeded, in view of

the danger of liquid hammer.

Charging with an unsuitable substance may cause

explosions and accidents, so always ensure that the

appropriate refrigerant is charged.

Refrigerant containers shall be opened slowly.

Always use protective gloves and protect your eyes when

charging refrigerant.

Ventilate the air if there was any refrigerant leakage

during the installation.

Leaked refrigerant will generate poisonous gas if

meeting fire.

Make sure there is no refrigerant leakage after the

installation.

Leaked refrigerant will generate poisonous gas if

meeting fire.

Allowed Lenght and Drop of Pipes

Requirements are different when installing the outdoor unit,

please refer to outdoor unit installation manual for detailed

information.

Material and Size of the Pipes

Three length(3m,5m,10m)of pipes are available to purchase.

8.2. Refrigerant pipe installation

NOTE

Drainage test Drainage test

Check whether the drainpipe is unhindered.

New built house should have this test done before paving

the ceiling.

Remove the test cover, and stow water of about 2000ml to the

water receiver through the stow tube.

Turn on the power, and operate the air conditioner under the

"COOLING" mode. Listen to the sound of the drain pump.

Check whether the water is discharger well (a lag of 1min is

allowed before discharging, according to the length of the drain

pipe), and check whether water leaks from the joints.

Stop the air conditioner, turn off the power, and reset the test

cover to its original position.

The drain plug is used to empty the water-receiver for

maintenance of the air conditioner. Please stuff it imposition at

all times during operation to avoid leakage.

The body's pump pipe and the drainpipe (especially the

indoor part) should be covered evenly with the out-let pipe

sheath (fittings) and be bound tightly with the constrictor to

prevent condensation caused by entered air.

To prevent water from flowing backwards into the air

conditioner while the air conditioner stops, please lean the

drainpipe down toward outdoor (outlet-side) at a degree of

over 1/ 50. And please avoid any bulge or water deposit.

Do not drag the drainpipe violently when connecting to

prevent the body from being pulled. Meanwhile, one

supportpoint should be set every 1~1.5m to prevent the

drainpipe from yielding.Or you can tie the drainpipe with the

connecting pipe to fix it.

In the case of prolonged drainpipe, you had better tighten its

indoor part with a protection tube to prevent it from loosing.

If the outlet of the drainpipe is higher than the body's pump

joint, the pipe should be arranged as vertically as possible.

And the lift distance must be less than 200mm, otherwise the

water will overflow when the air conditioner stops.

The end of the drainpipe should be over 50mm higher than

the ground or the bottom of the drainage chute, and do not

immerse it in water. If you discharge the water directly into

sewage, be sure to make a U-form aquaseal by bending the

pipe up to prevent the smelly gas entering the house through

the drain pipe.

9. CONNECT THE DRAIN PIPE

Install the drainpipe of the indoor unit

You can use a polyethylene tube as the drainpipe

(out-dia.37-39mm, in-dia.32mm). It could be bought at local

market or from your dealer.

Set the mouth of the drainpipe onto the root of the body's

pump-pipe, and clip the drainpipe and the out-let pipe sheath

(fittings) together firmly with the out-let pipe clasp (fitting).

The outdoor unit is factory charged with refrigerant. Some

systems require additional charging of refrigerant depending

on pipe lengths. The additional refrigerant to be charged

can be calculated from the following formule:

The standard pipe length is vary according to the requirements of

different area. For example, in North America area, the standard

pipe length is 7.5m(25ft). While in the other areas, the standard pipe

length is 5m(16ft).

Fixed-frequency R22 (orifice in the indoor unit):

Liquid side:φ6.35(1/4") (Total pipe length - standard pipe length)x30g(0.32oZ)/m(ft)

Liquid side:φ9.52(3/8") (Total pipe length - standard pipe length)x65g(0.69oZ)/m(ft)

Liquid side:φ12.7(1/2") (Total pipe length - standard pipe length)x115g(1.23oZ)/m(ft)

Fixed-frequency R22 (orifice in the outdoor unit):

Liquid side:φ6.35(1/4") (Total pipe length - standard pipe length)x15g(0.16oZ)/m(ft)

Liquid side:φ9.52(3/8") (Total pipe length - standard pipe length)x30(0.32oZ)/m(ft)

Liquid side:φ12.7(1/2") (Total pipe length - standard pipe length)x60g(0.64oZ)/m(ft)

Fixed-frequency R410A:

Liquid side:φ6.35(1/4") (Total pipe length - standard pipe length)x20g(0.21oZ)/m(ft)

Liquid side:φ9.52(3/8") (Total pipe length - standard pipe length)x40g(0.42oZ)/m(ft)

Liquid side:φ12.7(1/2") (Total pipe length - standard pipe length)x60g(0.64oZ)/m(ft)

Inverter R410A:

Liquid side:φ6.35(1/4") (Total pipe length - standard pipe length)x15g(0.16oZ)/m(ft)

Liquid side:φ9.52(3/8") (Total pipe length - standard pipe length)x30g(0.32oZ)/m(ft)

installation manual

Midea MCDD-Serie Seite 17

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