Toshiba MMU-AP0071MH Manuel D'installation page 16

5
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 the flare
connection method
• As the unit is sealed to atmospheric pressure.
It is not abnormal that no "Push...." sound will be
heard upon the removal of the flare nut.
• Ensure use of two spanners for the connecting of the
pipework to 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 carrying out airtight test, air purge, gas leak check
and addition of refrigerant refer to the Installation
Manual supplied with the outdoor unit.
Open fully valves of the outdoor unit
R22
Gas leak check
Using a leak detector or soapy water, check for gas
leaks at the connecting pipework and the caps on the
service valves.
Use a leak detector designed specifically for HFC
refrigerant (R410A, R134a, etc.).
Heat insulating process
Fit heat insulation to the gas and liquid pipes
separately.
During cooling mode, the temperature of the liquid and
the gas pipes are reduced. Therefore ensure sufficient
insulation is fitted to prevent dew condensation.
• On the gas side ensure that the heat insulation used
is heat resistant to a minimum temperature of 120°C
• Using the supplied heat insulation. Insulate the
interconnecting parts of the indoor unit, ensuring that
there is no exposure of any refrigerant pipework.
As detailed in the below illustration.
Apply the thermal insulation to the pipe connecting
section of the indoor unit securely up to the root
without exposure of the pipe. (The pipe exposed to
the outside causes water leak.)
Main unit
13
REQUIREMENT
REQUIREMENT
Set notching upward.
Pipe side
(Required at the site)
Attached heat insulating pipe