Daikin FTKE35BVMA [178/268] Outdoor unit
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Daikin FTKE35BVMA [178/268] Outdoor unit

Daikin 3MKD75BVMA [178/268] Outdoor unit
ED12-321A Outdoor Units
Installation Manual 173
4
Outdoor Unit
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
Gas pipe
Liquid pipe
Gas pipe
insulation
Liquid pipe
insulation
Finishing tape
Drain hose
Inter-unit wiring
(Cut exactly at
right angles.)
Remove burrs
Check
Flare’s inner
surface must
be flaw-free.
The pipe end must
be evenly flared in
a perfect circle.
Make sure that the
flare nut is fitted.
Set exactly at the position shown below.
A
A
IMPERIAL
RIGID
Die
0.5 mm
1.0 mm
Flaring
7
Flaring the Pipe End
1. Cut the pipe end with a pipe cutter.
2. Remove burrs with the cut surface facing downward
so that the chips do not enter the pipe.
3. Put the flare nut on the pipe.
4. Flare the pipe.
5. Check that the flaring is properly made.
Outdoor unit capacity class
Total length of piping for all rooms
3MXD68
30m
Pipe size
O.D.: 6.4mm / Thickness: 0.8mm
O.D.: 9.5mm, 12.7mm / Thickness: 0.8mm
O.D.: 15.9mm / Thickness: 1.0mm
Pipe insulation
I.D.: 8 – 10mm / Thickness: 10mm min.
I.D.: 12 – 15mm / Thickness: 13mm min.
I.D.: 16 – 20mm / Thickness: 13mm min.
5
Charging with Refrigerant
● If the total length of piping for all rooms exceeds the figure listed below, additionally charge with 20 g of refrigerant
(R-22) for each additional meter of piping.
6
Refrigerant Piping Work
Cautions on Pipe Handling
● 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.
(Bending radius should be 30 to 40 mm or larger.)
Selection of Copper and Heat Insulation materials
When using commercial copper pipes and fittings, observe the following:
● Insulation material: Polyethylene foam
Heat transfer rate: 0.041 to 0.052kW/mK (0.035 to 0.045 kcal/mh°C)
Refrigerant gas pipe’s surface temperature reaches 110°C max.
Choose heat insulation materials that will withstand this temperature.
● Be sure to insulate both the gas and liquid piping and to provide
insulation dimensions as below.
●
Cooling only models (2MKD58, 3MKD58, 3MKD75, 4MKD75) are chargeless. There is no need to charge with
● Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
Even though the shut-off valve is fully closed, the refrigerant may slowly leak out; do not leave the flare nut removed
for a long period of time.
CAUTION
For cooling only
4
Purging Air and Checking Gas Leakage
● When piping work is completed, it is necessary to purge the air and check for gas leakage.
Refer to “Purging Air and Checking Gas Leakage”.

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