Electric Work, Airtight test/Air purge, etc

5 REFRIGERANT PIPING

6 ELECTRIC WORK

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

Rigid (Clutch type)

Outer diam. of	R410A tool used		Conventional tool used
Outer diam. of
copper pipe	R410A	R22	R410A	R22
	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 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 pipe work to the indoor unit.

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

Gas leak check

Using a leak detector or soapy water, check for gas leaks at the connecting pipe work and the caps on the service valves.

REQUIREMENT

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 pipe work. As detailed in the illustration below.

WARNING

1.Using the specified wires, ensure the wires are connected and securely fixed so that no external force can transmit to the connecting part of the terminals.

Poor connection may cause risk of fire, etc.

2.Ensure connection of earth wire. (Grounding work)

Do not connect the earth wire to a gas pipe, mains water pipe, lightning rod, or the earth wire of a telephone. Incorrect earthing will cause risk of an electric shock.

3.For electrical installation work, strictly follow the Local and national Regulations of each country and the Installation Manual. A designated power supply must be used.

Capacity shortage of the power supply or incomplete installation may cause an electric shock or a fire.

CAUTION

Ensure an earth leakage breaker is installed.

Failure to install, may result in an electric shock.

REQUIREMENT

•For power supply wiring, strictly conform to the Local authorities in each country.

•For wiring of the power supply of the outdoor units, follow to the outdoor unit Installation Manual.

•Never connect 220–240V control wiring to the terminal blocks (U1, U2, A, B) fault will be. (Caused.)

•Arrange the electrical wiring so that they do not come into contact with high-temperature parts of the pipe work; this is to prevent the risk of insulation melting and causing a possible accident.

•After connecting wires to the terminal block. Secure wiring with cable clamp.

•Store wiring install control wiring and refrigerant piping within the same line.

•Do not turn on power of the indoor unit until vacuuming of the refrigerant pipe has finished.

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	18
Ø6.4	(1.4 to 1.8 kgf•m)	(1.8 kgf•m)
	(1.4 to 1.8 kgf•m)	(1.8 kgf•m)

Ø9.5	33 to 42	42
Ø9.5	(3.3 to 4.2 kgf•m)	(4.2 kgf•m)
	(3.3 to 4.2 kgf•m)	(4.2 kgf•m)

Ø12.7	50 to 62	50
Ø12.7	(5.0 to 6.2 kgf•m)	(5.0 kgf•m)
	(5.0 to 6.2 kgf•m)	(5.0 kgf•m)

Ø15.9	68 to 82	68
Ø15.9	(6.8 to 8.2 kgf•m)	(6.8 kgf•m)
	(6.8 to 8.2 kgf•m)	(6.8 kgf•m)

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)
Main unit
	Attached heat insulating pipe

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6 ELECTRIC WORK

• Projection margin in flaring :

B (Unit : mm)

Rigid (Clutch type)

Connection of refrigerant pipe

Airtight test/Air purge, etc.

Open fully valves of the outdoor unit

Gas leak check

REQUIREMENT

Heat insulating process

Fit heat insulation to the gas and liquid pipes separately.

2.Ensure connection of earth wire. (Grounding work)

REQUIREMENT

• Refer to the following table for tightening torque.

REQUIREMENT

MMU-AP0181MH, MMU-AP0071MH, MMU-AP0091MH, MMU-AP0151MH, MMU-AP0121MH specifications