Mitsubishi Electric PKA-A.HAL Installation Manual download pdf (Page 7)

4. Installing the refrigerant piping

5. Drainage piping work

5.1. Drainage piping work (Fig. 5-1)

• Drain pipes should have an inclination of 1/100 or more.

• For extension of the drain pipe, use a soft hose (inner dia. 15 mm, 19/32 inch)

available on the market or hard vinyl chloride pipe (VP-16/O.D. ø22 mm,

ø55/64 inch PVC TUBE). Make sure that there is no water leakage from the

connections.

• Do not put the drain piping directly in a drainage ditch where sulphuric gas may

be generated.

• When piping has been completed, check that water flows from the end of the

drain pipe.

Caution:

The drain pipe should be installed according to this Installation Manual to

ensure correct drainage. Thermal insulation of the drain pipes is necessary

to prevent condensation. If the drain pipes are not properly installed and

insulated, condensation may drip on the ceiling, floor or other possessions.

A Inclined downwards

B Must be lower than outlet point

C Water leakage

D Trapped drainage

E Air

F Wavy

G The end of drain pipe is under water.

H Drainage ditch

I 5 cm, 1-31/32 inch or less between the end of drain pipe and the ground.

J Drain hose

K Soft PVC hose (Inside diameter 15 mm, 19/32 inch)

Hard PVC pipe (VP-16)

* Bond with PVC type adhesive

Preparing left and left rear piping (Fig. 5-2)

1 Remove the drain cap.

• Remove the drain cap by holding the bit that sticks out at the end of the pipe and

pulling.

A Drain cap

2 Remove the drain hose.

• Remove the drain hose by holding on to the base of the hose a (shown by

arrow) and pulling towards yourself b.

3 Insert the drain cap.

• Insert a screwdriver etc into the hole at the end of the pipe and be sure to push

to the base of the drain cap.

4 Insert the drain hose.

• Push the drain hose until it is at the base of the drain box connection outlet.

• Please make sure the drain hose hook is fastened properly over the extruding

drain box connection outlet.

B Hooks

¡ Storing in the piping space of the indoor unit (Fig. 5-3)

* When the drain hose will be routed indoors, be sure to wrap it with commercially

available insulation.

* Gather the drain hose and the refrigerant piping together and wrap them with the

supplied felt tape 3.

* Overlap the felt tape 3 at one-half of the tape width.

* Fasten the end portion of the wrapping with vinyl tape, etc.

A Gas pipe

B Liquid pipe

C Drain hose

D Indoor/outdoor connection wiring

E Felt tape 3

¡ Check of drainage (Fig. 5-4)

1. Open the front grille and remove the filter.

2. Facing the fins of the heat exchanger, slowly fill with water.

3. After the drainage check, attach the filter and close the grille.

Fig. 5-4

Fig. 5-3

Fig. 5-1

Fig. 5-2

Fig. 4-4

 PKA-A·HA(L)

4.4.1. Storing in the piping space of the unit (Fig. 4-4)

1. Wrap the supplied felt tape in the range of the refrigerant piping which will be

housed within the piping space of the unit to prevent dripping.

2. Overlap the felt tape at one-half of the tape width.

3. Fasten the end portion of the wrapping with vinyl tape, etc.

A Gas pipe

B Liquid pipe

C Indoor/outdoor connection cable

D Felt tape 3

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Mitsubishi Electric PKA-A.HAL Installation Manual Page 7

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