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4. Installing the indoor unit

Suspension bolt (Procure locally)

Ceiling

Nut (Procure locally)

Washer (with insulation) (Accessory)

+5 0

Min. 30

Fig. 4-5

4.5. Unit suspension procedures (Fig. 4-5)

Suspend the main unit as shown in the diagram.
1. In advance, set the parts onto the suspension bolts in the order of the washers

(with insulation), washers (without insulation) and nuts (double).

• Fit the washer with cushion so that the insulation faces downward.
• In case of using upper washers to suspend the main unit, the lower washers (with

insulation) and nuts (double) are to be set later.

2. Lift the unit to the proper height of the suspension bolts to insert the mounting

plate between washers and then fasten it securely.

3. When the main unit can not be aligned against the mounting hole on the ceiling, it

is adjustable owing to a slot provided on the mounting plate. (Fig. 4-6)

• Make sure that step A is performed within 27-32 mm. Damage could result by

failing to adhere to this range.

4.6. Confirming the position of main unit and tighten-

ing the suspension bolts (Fig. 4-7)

• Using the gauge attached to the grille, ensure that the bottom of the main unit is

properly aligned with the opening of the ceiling. Be sure to confirm this, otherwise
condensation may form and drip due to air leakage etc.

• Confirm that the main unit is horizontally levelled, using a level or a vinyl tube filled

with water.

• After checking the position of the main unit, tighten the nuts of the suspension bolts

securely to fasten the main unit.

• The installation template can be used as a protective sheet to prevent dust from

entering the main unit when the grilles are left unattached for a while or when the
ceiling materials are to be lined after installation of the unit is finished.

* As for the details of fitting, refer to the instructions given on the Installation template.

Main unit

Ceiling

Installation template (Accessory)

Screw with washer (Accessory)

Fig. 4-7

5. Refrigerant piping work

5.1. Refrigerant pipe (Fig. 5-1)

Check that the difference between the heights of the indoor and outdoor
units, the length of refrigerant pipe, and the number of bends in the pipe are
within the limits shown below.

Models

(A) Pipe length

(B) Height

(one way)

difference

bends (one way)

SLZ-A09/A12

max. 20 m

max. 12 m

max. of 10

SLZ-A18

max. 30 m

max. 15 m

max. of 10

• Height difference limitations are binding regardless of which unit, indoor or outdoor,

is positioned higher.

• Refrigerant adjustment ... If pipe length exceeds 7 m, additional refrigerant (R410A)

charge is required.
(The outdoor unit is charged with refrigerant for pipe length up to 7 m.)

Up to 7 m

No additional charge is required.

Pipe length

Exceeding 7 m

Additional charge is required.
(Refer to the table below.)

Refrigerant to

SLZ-A09/A12 type 30 g

(refrigerant piping length (m) -7)

be added

SLZ-A18 type

50 g

(refrigerant piping length (m) -7)

(C)

(B)

(A)

Piping preparation

• Refrigerant pipes of 3, 5, 7, 10 and 15 m are available as optional items.

(1) Table below shows the specifications of pipes commercially available.

(2) Ensure that the 2 refrigerant pipes are well insulated to prevent condensation.
(3) Refrigerant pipe bending radius must be 100 mm or more.

Caution:

Using careful insulation of specified thickness. Excessive thickness prevents
storage behind the indoor unit and smaller thickness causes dew drippage.

Pipe

For liquid

For gas

For liquid

For gas

For liquid

For gas

Outside diameter

inch

6.35

1/4

9.52