Toshiba MMU-AP0071YH Connection of refrigerant pipe, Airtight test/Air purge, etc

• Projection margin in flaring : B (Unit : mm)

Rigid (Clutch type)

Outer diam. of	R410A tool used		Conventional tool used
copper pipe	R410A	R22	R410A	R22
6.4	0 to 0.5	(Same as left)	1.0 to 1.5	0.5 to 1.0
9.5	0 to 0.5	(Same as left)	1.0 to 1.5	0.5 to 1.0
12.7	0 to 0.5	(Same as left)	1.0 to 1.5	0.5 to 1.0
15.9	0 to 0.5	(Same as left)	1.0 to 1.5	0.5 to 1.0

Imperial (Wing nut type)

Outer diam. of copper pipe	R410A	R22
6.4	1.5 to 2.0	1.0 to 1.5
9.5	1.5 to 2.0	1.0 to 1.5
12.7	2.0 to 2.5	1.5 to 2.0
15.9	2.0 to 2.5	1.5 to 2.0

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	Re-tightening
outer dia. (mm)	(N•m)	torque (N•m)
Ø6.4	14 to 18 (1.4 to 1.8 kgf•m)	18 (1.8 kgf•m)
Ø9.5	33 to 42 (3.3 to 4.2 kgf•m)	42 (4.2 kgf•m)
Ø12.7	50 to 62 (5.0 to 6.2 kgf•m)	50 (5.0 kgf•m)
Ø15.9	68 to 82 (6.8 to 8.2 kgf•m)	68 (6.8 kgf•m)

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.

REQUIREMENT

Be sure to use the tool such as charge hose exclusive to R410A.

Do not turn on the power until the airtight test and the vacuuming have finished. (If turning on the power, the incorporated PMV is closed fully and the period until the vacuuming finishes elongates.

Open fully valves of the outdoor unit

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.

REQUIREMENT

Use a leak detector manufactured exclusively for HFC refrigerant (R410A, R134a, etc.).

Heat insulating process

Perform heat insulating for pipes at liquid side and gas side separately.

In cooling time, temperature at both liquid and gas sides becomes lower.

Therefore, perform heat insulating process sufficiently to avoid dewing.

•For heat insulator of pipe at gas side, be sure to use one with heat-resisting temp.120°C or more.

•Using the attached heat insulating pipe, perform heat insulating process securely for pipe connecting part of the indoor units without clearance.

REQUIREMENT

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.)

	Set notching upward.
	Pipe side
Main unit	(Required at the site)
	Attached heat insulating pipe

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