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CAUTION
CAUTION
1) Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.)
1) Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.)
2) To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R32.)
2) To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R32.)
3) Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.
3) Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.
Align the centres of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fully with the torque wrenches.
Align the centres of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fully with the torque wrenches.
Apply refrigeration oil to the inner surface of the flare.
Apply refrigeration oil to the inner surface of the flare.
Do not apply refrigeration oil to the outer surface.
Do not apply refrigeration oil to the outer surface.
Do not apply refrigeration oil to the flare nut to
Do not apply refrigeration oil to the flare nut to
avoid tightening with excessive torque.
avoid tightening with excessive torque.
1. Cautions on pipe handling
1. Cautions on pipe handling
1) Protect the open end of the pipe against dust and moisture.
1) Protect the open end of the pipe against dust and moisture.
2) All pipe bends should be as gentle as possible.
2) All pipe bends should be as gentle as possible.
Use a pipe bender for bending.
Use a pipe bender for bending.
2. Selection of copper and heat insulation materials
2. Selection of copper and heat insulation materials
When using commercial copper pipes and fittings, observe the following:
When using commercial copper pipes and fittings, observe the following:
1) Insulation material: Polyethylene foam
1) Insulation material: Polyethylene foam
Heat transfer rate: 0.041 to 0.052W/mK (0.035 to 0.045kcal/(mh •˚C)
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.
Refrigerant gas pipe's surface temperature reaches 110˚C max.
Choose heat insulation materials that will withstand this
Choose heat insulation materials that will withstand this
temperature.
temperature.
2) Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as below.
2) Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as below.
Piping size, mm (in)
Piping size, mm (in)
6.4 (1/4")
6.4 (1/4")
9.5 (3/8")
9.5 (3/8")
12.7 (1/2")
12.7 (1/2")
15.9 (5/8")
15.9 (5/8")
19.1 (3/4")
19.1 (3/4")
NOTICE
NOTICE
Do NOT exceed the unit's maximum working pressure (see "Max. Allowable Pressure" on the unit name plate).
Do NOT exceed the unit's maximum working pressure (see "Max. Allowable Pressure" on the unit name plate).
PURGING AIR AND CHECKING GAS LEAKAGE
PURGING AIR AND CHECKING GAS LEAKAGE
• When piping work is completed, it is necessary to purge the air and check for gas leakage
• When piping work is completed, it is necessary to purge the air and check for gas leakage
WARNING
WARNING
1) Do not mix any substance other than the specified refrigerant (R32) into the refrigeration cycle.
1) Do not mix any substance other than the specified refrigerant (R32) into the refrigeration cycle.
2) When refrigerant gas leaks occur, ventilate the room as soon and as much as possible.
2) When refrigerant gas leaks occur, ventilate the room as soon and as much as possible.
3) R32, as well as other refrigerants, should always be recovered and never be released directly into the environment.
3) R32, as well as other refrigerants, should always be recovered and never be released directly into the environment.
4) Use a vacuum pump for R32 exclusively. Using the same vacuum pump for different refrigerants may damage the vacuum
4) Use a vacuum pump for R32 exclusively. Using the same vacuum pump for different refrigerants may damage the vacuum
pump or the unit.
pump or the unit.
• If using additional refrigerant, perform air purging from the refrigerant pipes and indoor
• If using additional refrigerant, perform air purging from the refrigerant pipes and indoor
unit using a vacuum pump, then charge additional refrigerant.
unit using a vacuum pump, then charge additional refrigerant.
• Use a hexagonal wrench (4mm) to operate the stop valve rod.
• Use a hexagonal wrench (4mm) to operate the stop valve rod.
• All refrigerant pipe joints should be tightened with a torque wrench at the specified
• All refrigerant pipe joints should be tightened with a torque wrench at the specified
tightening torque.
tightening torque.
REFRIGERANT PIPING
REFRIGERANT PIPING
[Apply oil]
[Apply oil]
Flare nut
Flare nut
Minimum bend radius
Minimum bend radius
Piping thickness
Piping thickness
30mm or more
30mm or more
0.8mm
0.8mm
30mm or more
30mm or more
(C1220T-O)
(C1220T-O)
40mm or more
40mm or more
50mm or more
50mm or more
1.0mm
1.0mm
(C1220T-O)
(C1220T-O)
50mm or more
50mm or more
Rain
Rain
Thermal insulation size Thermal insulation thickness
Thermal insulation size Thermal insulation thickness
I.D. 8-10mm
I.D. 8-10mm
I.D. 12-15mm
I.D. 12-15mm
I.D. 14-16mm
I.D. 14-16mm
10mm Min.
10mm Min.
I.D. 16-20mm
I.D. 16-20mm
I.D. 20-24mm
I.D. 20-24mm
[Tighten]
[Tighten]
Torque wrench
Torque wrench
Spanner
Spanner
Pipe union
Pipe union
Flare nut
Flare nut
Pipe Size, mm (in)
Pipe Size, mm (in)
Torque, Nm/(ft-lb)
Torque, Nm/(ft-lb)
6.4 (1/4")
6.4 (1/4")
18 (13.3)
18 (13.3)
9.5 (3/8")
9.5 (3/8")
42 (31.0)
42 (31.0)
12.7 (1/2")
12.7 (1/2")
55 (40.6)
55 (40.6)
15.9 (5/8")
15.9 (5/8")
65 (48.0)
65 (48.0)
19.1 (3/4")
19.1 (3/4")
78 (57.6)
78 (57.6)
Be sure to place
Be sure to place
a cap.
a cap.
If no flare cap is available,
If no flare cap is available,
cover the flare mouth
cover the flare mouth
with tape to keep dirt or
with tape to keep dirt or
water out.
water out.
Inter-unit wire
Inter-unit wire
Gas pipe
Gas pipe
Gas pipe insulation
Gas pipe insulation
Finishing tape
Finishing tape
Compound
Compound
Pressure meter
Pressure meter
pressure gauge
pressure gauge
Gauge manifold
Gauge manifold
Hi g h
Hi g h
Low-pressure
Low-pressure
pressure
pressure
valve
valve
val v e
val v e
Charging hoses
Charging hoses
Vacuum pump Service port
Vacuum pump Service port
ENGLISH
ENGLISH
Wall
Wall
Liquid pipe
Liquid pipe
Liquid pipe insulation
Liquid pipe insulation
Drain hose
Drain hose
Valve
Valve
Liquid stop
Liquid stop
caps
caps
valve
valve
Gas stop valve
Gas stop valve
10
10
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