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Charging with refrigerant
6.
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.
•
Refrigerant piping work
7.
Cautions on pipe handling
Protect the open end of the pipe against dust and moisture.
1)
All pipe bends should be as gentle as possible. Use a pipe bender for bending.
2)
Selection of copper and heat insulation materials
When using commercial copper pipes and
fi
ttings, observe the following:
Insulation material: Polyethylene foam
1)
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
E
joint pipe
connected to the outdoor unit is covered with heat insulation material.
Gas pipe
O.D.: 6.4mm, 9.5mm, 12.7mm / Thickness: 0.8mm (C1220T-O)
O.D.: 15.9mm / Thickness: 1.0mm (C1220T-O)
Liquid pipe
O.D.: 6.4mm / Thickness: 0.8mm (C1220T-O)
Water heater
connecting pipe
O.D.: 12.7mm / Thickness: 0.8mm (C1220T-O)
Gas pipe insulation
Thickness:19mm
Liquid pipe insulation
Thickness:13mm
Water heater connecting pipe insulation Thickness:19mm
Minimum bend radius
O.D.: 6.4mm, 9.5mm / 30mm or more
O.D.: 12.7mm / 40mm or more
O.D.: 15.9mm / 50mm or more
Separate and individually insulate the gas pipe, liquid pipe, water heater supply pipe, and water heater discharge pipe.
3)
Flaring the pipe end
8.
Cut the pipe end with a pipe cutter.
1)
Remove burrs with the cut surface facing downward so that the chips do not enter the pipe.
2)
Put the
fl
are nut on the pipe.
3)
Flare the pipe.
4)
Check that the
fl
aring is properly made.
5)
(Cut exactly at
right angles.)
Remove burrs.
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.
Check
Set exactly at the position shown below.
A
Die
Flare tool for R410A
Conventional
fl
are tool
Clutch-type
Clutch-type
(Rigid-type)
Wing-nut type
(Imperial-type)
A
0
-
0.5mm
1.0
-
1.5mm
1.5
-
2.0mm
Flaring
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.
•
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 wire
Indoor unit connection pipe
Finishing tape
Pipe insulation
Water heater
connecting pipe
Water heater connection pipe
Thermistor wire
for water heater
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