Toshiba RBC-TWP50 INSTALLATION MANUAL

FOR NEW REFRIGERANT R410A

Installation Manual

Branch Pipes

Model RBC-TWP 30•50

Toshiba Carrier Corporation

For “Cautions on Safety”, please read “Cautions on Safety” contained in the installation manual of the air conditioner and follow the precautions.

Important

Read the following cautions carefully before installing your air conditioner.

The two indoor units of TOSHIBA simultaneous twin packaged air conditioning system are the same units. Set and install the main and sub units taking the installation site into consideration. (Be certain to use the new refrigerant R410A in the indoor units.) The indoor unit connected to the remote control switch will be the main unit.

1. Installation

● These branch pipes are for new HFC refrigerant R410A that does not destroy the ozone layer.

1) Compared with the previous refrigerants, pressure of Refrigerant R410A is about 1.6 times higher and is easily affected by impurities such as moisture, oxidized films and oil. The new refrigerant also requires new refrigerating machine oil. Make certain to prevent mixing of moisture, rubbish, old refrigerant and refrigerating machine oil into the refrigeration cycle of the air conditioner with the new refrigerant when installing the air conditioner.

2) The sizes of the air conditioner charge port and connection part of the installation tool are different from those of the previous refrigerant to prevent mixing of the refrigerant and refrigerating machine oil. A special tool dedicated to the new refrigerant R410A is need. (For the complete information, read the installation manual for air conditioner outdoor units.)

3) Use clean, new pipe fittings when connecting the connection pipe. Install the pipe carefully avoiding mixing of moisture and rubbish.

2. Wiring

1) The remote control switch cannot be connected to both of the two indoor units (main and sub units). Connect it only to the indoor unit that will become the main indoor unit (Unit A). Connecting the remote control switch to the sub indoor unit will cause malfunction.

3. Refrigerant Piping (Branch piping system is used for refrigerant piping)

1) Compared with R22, pressure of R410A is about 1.6 times. Unless the piping is installed correctly, gas leak may be caused during operation such as pressure boosting. Conduct a leak test of the pipe connecting parts correctly.

2) In case the actual length of the piping exceeds the standard piping length, accurately add the refrigerant referring to Additional Refrigerant Amount .

3) Thermal insulation materials for the branch pipes are not supplied as accessories. Provide thermal insulation correctly using fitting covers or other materials sold on the market. For further information, read Refrigerant Piping and Piping Thermal Insulation . Improper thermal insulation work will result in a failure and a claim.

Components

The following parts are supplied as accessories of the branch pipes. Check them when opening the carton box.

Part Quantity Shape Use

Installation Instructions 1 This booklet For installation works

Gas side 1

Branch pipe

Liquid side 1

Refrigerant Piping

Tolerance of Pipe Length Tolerance of Pipe Head

Indoor Unit B

Outdoor unit

Indoor Unit A

Branch pipe

Model

(RAV-)

SM1100AT-E SM1400AT-E

Pipe Length (One Direction) Height Defference

Full length

L+a or

L+b

Below 50m

(actual length)

Branch

piping

a, b

Below

15m

(actual

length)

Difference

of branch

piping length

b-a, or a-b

Below 10m

For refrigerant pipe branching and collection

Outdoor Unit -

Indoor Unit

Outdoor

Unit

Installed

Above Indoor

Unit

Below

30m

Outdoor

Unit

Installed

Below

Indoor Unit

Below 15m

Between

Indoor

Units

∆h

Below

0.5m

Remarks

Less

than 10

bends

Refrigerant Piping

Cautions

When planning a layout for Units A and B, comply with the following:

1. The lengths after branching (“a” and “b”) should be equal if feasible. Install Units A and B so that the difference of the branching lengths becomes less than 10m if the lengths cannot be equal due to the branch pipe position.

2. Install Units A and B on the same level. If Units A and B cannot be installed on the same level, the difference in level should be limited to 0.5m or less.

3. Be certain to install Units A and B in the same room. Units A and B cannot be operated independently each other.

Piping Materials and Sizes

● Use copper tube of Type 1220 in JIS H 3300 (Copper and copper alloy seamless pipes and tubes) with 40mg/10m or less in the amount of oil stuck on inner walls of pipe and

0.8mm in pipe wall thickness for diameters 6.4, 9.5 and 12.7mm and

1.0mm, for diameter 15.9mm. Never

Pipe

side

Model

(RAV-)

side

Liquid

side

In parentheses ( ) are wall thickness [unit: mm]

SH1100AT-E SH1400AT-E

Main piping Ø15.9 (1.0) Gas

Branch piping Ø 12.7 (0.8) Ø 15.9 (1.0)

Main piping Ø 9.5 (0.8)

Branch piping Ø 6.4 (0.8) Ø 9.5 (0.8)

use pipes of thin wall thickness such as

0.7mm.

Branch Pipe

Now the refrigerant pipe is installed using branch pipes supplied as accessories.

● Bend and adjust the refrigerant piping so that the branch pipes and pipe after branching become horizontal.

● Fix the branch pipes onto a wall in a ceiling or onto a column.

● Provide a straight pipe longer than 500mm in length as the main piping of the branches.

Horizontal

Inclination

Horizontal

Inclination

500mm or more

Air Purging

For the complete information, read the installation instructions for outdoor units of air conditioner.

● Purge air using a vacuum pump.

Additional Refrigerant Amount

Cautions

● Be certain to write the additional refrigerant amount, pipe length (actual length), head and other specification on the nameplate put on the outdoor unit for recording.

● Seal the correct amount of additional refrigerant in the system.

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