Key Points Of Air Conditioner Installation - Toshiba MMU-AP0091H Installation Manual

4. KEY POINTS OF AIR CONDITIONER INSTALLATION

In order to prevent problems before they arise, carefully read (1) the Installation Manual provided with the
equipment, and (2) the Owner's Manual before installing the air conditioner.
4-1. Flow of Air Conditioner Installation Work
[Step]
(Prior to Installation)
Determination of extent
of installation work
Drafting of diagrams
(Installation)
Sleeve/insert installation
Indoor unit installation
Refrigerant pipe installation
Drain pipe installation
Duct installation
Insulation work
Electrical work
(control wires and power wires)
Various switch settings
Outdoor unit base installation
Outdoor unit installation
Outside circulation,
refrigerant pipe installation
Gas-leak test
Vacuum suction
Addition of refrigerant
Ceiling panel installation
Test operation and adjustment
Owner's Manual transfer
The procedure described above presents only the general sequence of steps; the sequence of steps may have
to be altered according to the circumstances of any specific installation job.
Clearly determine the extent of the installation work.
Draft :
• Control wiring system diagram
• Refrigerant line system diagram
• Power wiring system diagram
Pay careful attention to the downward slope of the drain pipe.
Be sure to check the name of the model in order to avoid any
installation mistakes. If the model has an installation pattern, attach
the pattern to the ceiling to mark the position of the ceiling openings
and to keep dust away.
Make sure that the pipe system is dry, clean, and airtight.
When brazing pipes, blow out the system with nitrogen gas.
Do not forget the system indications.
(to outdoor outlet)
Pipes should have downward slope (of at least 1/100).
Make sure the duct is large enough to carry the desired volume of air.
Be careful not to make any errors in the external static pressure
calculations.
Be especially careful to close off all gaps where connections are
made to the indoor unit, and at joints in the branching kit. Do not
forget the drain pipes.
Use two-core shielded wires for the control wires, and use separate
power supplies for the indoor and outdoor units.
Set the switches correctly, as indicated in the control wiring system
diagram.
Make sure that the base is level.
Provide for adequate air flow and service space around the outdoor
unit. Indicate the system names clearly.
From outside outlet to outdoor unit.
In the final test, the system must be pressurized at 3.73MPa (38kg/
cm²G) for 24 hours with no decrease in pressure.
Use a vacuum pump with reverse flaw prevention adaptor with a
large output volume and that can achieve a high level of vacuum.
Record the amount of refrigerant that was added to the system on
both the outdoor unit and on the pre-test operation checklist.
Make sure that the ceiling panel is attached to the ceiling material
tightly, with no gaps.
Operate the indoor units one by one, making sure that all wiring and
pipes are connected correctly, and fill out the checklist.
Explain how to operate the system clearly and concisely.
[Key Points]
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