Charging With Refrigerant; Flaring The Pipe End - Daikin 3MWKS80KV1? 3MWKS80LV1 Installation Manual

6.

Charging with refrigerant

• If the total length of the indoor unit connection pipe exceeds 30m, charge the pipe with an additional 20g of refrigerant per 1m.
NOTE
• The length of the water heater connection pipe has no effect.
CAUTION
• Even though the stop valve is fully closed, the refrigerant may slowly leak out; do not leave the fl are nut removed for a long period of time.
7.
Refrigerant piping work
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
When using commercial copper pipes and fi ttings, observe the following:
1) Insulation material: Polyethylene foam
Heat transfer rate: 0.041 to 0.052W/mK (0.035 to 0.045kcal/mh°C)
Refrigerant gas pipe's surface temperature reaches 110°C max.
Choose heat insulation materials that will withstand this temperature.
2) Insulate the gas pipe, liquid pipe, and water heater connecting pipe in accordance
with the following insulation material measurements. Also ensure that the
connected to the outdoor unit is covered with heat insulation material.
Gas pipe
Liquid pipe
Water heater
connecting pipe
Gas pipe insulation
Liquid pipe insulation
Water heater connecting pipe insulation Thickness:19mm
Minimum bend radius
3) Separate and individually insulate the gas pipe, liquid pipe, water heater supply pipe, and water heater discharge pipe.
8.

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 fl are nut on the pipe.
4) Flare the pipe.
5) Check that the fl aring is properly made.
Flare's inner
surface must
be flaw-free.
WARNING
• Do not use mineral oil on fl ared part.
• Prevent mineral oil from getting into the system as this would reduce the lifetime of the units.
• Never use piping which has been used for previous installations. Only use parts which are delivered with the unit.
• Do never install a drier to this R410A unit in order to guarantee its lifetime.
• The drying material may dissolve and damage the system.
• Incomplete fl aring may cause refrigerant gas leakage.
English
O.D.: 6.4mm, 9.5mm, 12.7mm / Thickness: 0.8mm (C1220T-O)
O.D.: 15.9mm / Thickness: 1.0mm (C1220T-O)
O.D.: 6.4mm / Thickness: 0.8mm (C1220T-O)
O.D.: 12.7mm / Thickness: 0.8mm (C1220T-O)
Thickness:19mm
Thickness:13mm
O.D.: 6.4mm, 9.5mm / 30mm or more
O.D.: 12.7mm / 40mm or more
O.D.: 15.9mm / 50mm or more
Check
The pipe end must be evenly
flared in a perfect circle.
Make sure that the
flare nut is fitted.
joint pipe
E
(Cut exactly at
right angles.)
Set exactly at the position shown below.
Flare tool for R410A
A
Clutch-type
Die
A -
0 0.5mm
Be sure to
place a cap.
Rain
If no flare cap is
available, cover
the flare mouth
with tape to keep
dirt or water out.
Indoor unit connection pipe
Inter-unit wire
Gas pipe
Gas pipe
insulation
Finishing tape
Water heater connection pipe
Pipe insulation
Water heater
Finishing tape
connecting pipe
Thermistor wire
for water heater
Remove burrs.
Flaring
Conventional fl are tool
Clutch-type Wing-nut type
(Rigid-type) (Imperial-type)
-
1.0 1.5mm 1.5
Wall
Liquid pipe
Liquid pipe
insulation
Drain hose
-
2.0mm
9