Refrigerant Piping Work - Mitsubishi Electric SLZ-A09AR Installation Manual

4. Installing the indoor unit
A
B
A Suspension bolt (Procure locally)
B Ceiling
C Nut (Procure locally)
D Washer (with insulation) (Accessory)
Fig. 4-5
Fig. 4-6
A
B
D
Fig. 4-7

5. Refrigerant piping work

A
(B)
Fig. 5-1
A
ø9.52
ø12.7
Fig. 5-2
A
C
D
E
Min. 30
F
C
G
B
E Mounting plate
F Washer (without insulation) (Accessory)
G Check using the Installation gauge
A Main unit
B Ceiling
C Gauge (Grille accessory)
D Ceiling opening dimensions
A Main unit
B Ceiling
C Installation template (Accessory)
D Screw with washer (Accessory)
C
(A)
A Indoor unit
B Outdoor unit
B
(C)
A Indoor unit
B Outdoor unit
ø6.35
B
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.
5.1. Refrigerant pipe (Fig. 5-1)
s 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
(one way)
SLZ-A09/A12 max. 20 m
SLZ-A18 max. 30 m
• 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
Pipe length
Exceeding 7 m
SLZ-A09/A12 type 30 g × (refrigerant piping length (m) -7)
Refrigerant to
be added SLZ-A18 type
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.
Outside diameter
Model Pipe
mm inch
For liquid 6.35 1/4
SLZ-A09
For gas 9.52 3/8
For liquid
6.35 1/4
SLZ-A12
For gas 9.52 3/8
For liquid 6.35 1/4
SLZ-A18
For gas
12.7 1/2
(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.
(B) Height (C) Number of
difference bends (one way)
max. 12 m max. of 10
max. 15 m max. of 10
No additional charge is required.
Additional charge is required.
(Refer to the table below.)
50 g × (refrigerant piping length (m) -7)
Min wall Insulation Insulation
thickness thickness material
0.8 mm 8 mm
0.8 mm 8 mm
Heat resisting
0.8 mm 8 mm
foam plastic
0.8 mm 8 mm
0.045 specific
0.8 mm 8 mm
gravity
0.8 mm 8 mm
5