Gas Leak Check - Toshiba MMK-AP0072H Installation Manual

8
REFRIGERANT PIPING
• Projection margin in flaring :
B (Unit : mm)
Rigid (Clutch type)
R410A tool used
Outer diam. of
copper pipe
R410A
6.4 0 to 0.5 (Same as left)
9.5 0 to 0.5 (Same as left)
12.7 0 to 0.5 (Same as left)
15.9 0 to 0.5 (Same as left)
Imperial (Wing nut type)
Outer diam. of copper pipe
6.4
9.5
12.7
15.9
Connection of refrigerant pipe
Connect all the refrigerant pipes with flare connecting
work.
• Since the atmospheric pressure only is sealed as the
sealing gas, it is not abnormal that "Pushu..." sound
is not heard when the flare nut is removed.
• Be sure to use a double spanner for pipe connecting
work of the indoor unit.
Work using double spanner
• Refer to the following table for tightening torque.
Connecting pipe Tightening torque
outer dia. (mm)
Ø6.4
(1.4 to 1.8 kgf•m)
Ø9.5
(3.3 to 4.2 kgf•m)
Ø12.7
(5.0 to 6.2 kgf•m)
Ø15.9
(6.8 to 8.2 kgf•m)
Conventional tool used
R22 R410A
1.0 to 1.5 0.5 to 1.0
1.0 to 1.5 0.5 to 1.0
1.0 to 1.5 0.5 to 1.0
1.0 to 1.5 0.5 to 1.0
R410A R22
1.5 to 2.0 1.0 to 1.5
1.5 to 2.0 1.0 to 1.5
2.0 to 2.5 1.5 to 2.0
2.0 to 2.5 1.5 to 2.0
Re-tightening
(N•m) torque (N•m)
14 to 18 18
(1.8 kgf•m)
33 to 42 42
(4.2 kgf•m)
50 to 62 50
(5.0 kgf•m)
68 to 82 68
(6.8 kgf•m)
B
Airtight test/Air purge, etc.
For airtight test, air purge, addition of refrigerant, and
gas leak check, follow the Installation Manual attached
to the outdoor unit.
Open fully valves of the outdoor unit
R22

Gas leak check

Check with a leak detector or soap water whether gas
leaks or not, from the pipe connecting section or cap
of the valve.
Use a leak detector manufactured exclusively for
HFC refrigerant (R410A, R134a, etc.).
11
REQUIREMENT