Toshiba Carrier MMD-AP0184SPH2UL Installation Manual - Page 13

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• Use the tightening torque levels as listed in the

following table.

Outer dia. of connecting

Tightening torque

pipe (in (mm))

(ft•lbs (N•m))

1/4" (6.4)

10 to 13 (14 to 18)

3/8" (9.5)

24 to 31 (33 to 42)

1/2" (12.7)

37 to 46 (50 to 62)

• Tightening torque of flare pipe connections.

Pressure of R410A is higher than that of R22.

(Approx. 1.6 times) Therefore, using a torque

wrench, tighten the flare pipe connecting sections

which connect the indoor and outdoor units of the

specified tightening torque.

Incorrect connections may cause not only a gas leak,

but also an error of the refrigeration cycle.

CAUTION

Tightening with an excessive torque may crack the nut

depending on installation conditions.

Airtight test / air purge, etc.

For air tightness test, adding refrigerant, refer to the

Installation Manual attached to the outdoor unit.

CAUTION

Do not supply power to the indoor unit until the airtight

test and vacuuming are completed. (If the indoor unit is

powered on, the pulse motor valve is fully closed, which

extends the time for vacuuming.)

Open the valve fully

Open the valve of the outdoor unit fully.

23-EN

Heat insulation process

Apply heat insulation for the pipes separately at liquid

side and gas side.

• For the heat insulation to the pipes at gas side, use

the material with heat-resisting temperature 248 °F

(120 °C) or higher.

• To use the attached heat insulation pipe, apply the

heat insulation to the pipe connecting section of the

indoor unit securely without gap.

REQUIREMENT

• Apply the heat 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.)

• Wrap heat insulator with its slits facing up (ceiling

side).

• Apply heat insulating materials to both the gas side

and liquid side as shown:

To cover the pipe and the

indoor unit with a heat

insulator, do not make a

gap between them.

Indoor unit

Flare nut

Heat insulator

Union

of the pipe

Wrap the insulator

Banding band

with adhesive tale.

(Accessory)

(locally procured)

Electrical connection

WARNING

1. Use predefined wire and connect them certainly.

Keep the connecting terminal free from external

force.

Improper wire connection or clamping may result in

exothermic, fire or malfunction.

2. Connect ground wire. (grounding work)

Incomplete grounding cause an electric shock.

Do not connect ground wires to gas pipes, water

pipes, lightning rods or ground wires for telephone

wires.

3. Install appliance in accordance with national

wiring regulations.

Capacity shortage of circuit breaker or incomplete

installation may cause an electric shock or a fire.

CAUTION

• Consult local building codes, NEC (National Electrical

Code) or CEC (Canadian Electrical Code) for special

requirements.

• If incorrect / incomplete wiring is carried out, it will

cause an electrical fire or smoke.

• Install circuit breaker is not tripped by shock waves.

If circuit breaker is not installed, an electric shock may

be caused.

• Use the cord clamps attached to the product.

• Do not damage or scratch the conductive core and

inner insulator of power and control wires when

peeling them.

• Use the power cord and control wire of specified

thickness, type, and protective devices required.

• Do not connect 208 / 230 V power to the terminal

blocks (U1, U2, A, B etc.) for control wiring.

(Otherwise, the system will fail.)

• Perform the electric wiring so that it does not come to

contact with the high-temperature part of the pipe.

The coating may melt resulting in an accident.

• Do not turn on the circuit breaker of the indoor unit

until vacuuming of the refrigerant pipes completes.

REQUIREMENT

• For power supply wiring, strictly conform to the Local

Regulation in each country.

• Run the refrigerant piping line and control wiring line in

the same line.

– 12 –

Power supply wire and

control wires specifications

Power supply wire and control wires are locally

procured.

For the power supply specifications, follow to the table

below. If capacity is little, it is dangerous because

overheat or seizure may be caused.

Indoor unit power supply

For the power supply of the indoor unit, prepare the

exclusive power supply separated from that of the

outdoor unit.

▼ Power supply

Power supply

208 / 230-1-60

Control wiring, Central control wiring

• 2-core with non-polarity wires are used for the

control wiring between indoor unit and outdoor unit

and Central control wiring.

• To prevent noise trouble, use 2-core shielded wire.

• The length of the communication line means the total

length of the control wire length between indoor and

outdoor units added with the central control wire

length.

24-EN