Before execution
Execution
Execution zone decision
Confirmation of refrigerant used
Preparation of execution drawings
Confirmation of installation site
Preparations before execution
Execution procedure and precautions Reason
01-01
1-1 EXECUTION PROCEDURE AND EXECUTION PRECAUTIONS
1. TEST RUN
Sleeve and insert work
Indoor unit installation
Refrigerant piping work
Drain piping work
Duct work
Heat insulation work
Electrical work
Foundation work for products
Refrigerant piping connection work
Air tightness test
Vacuum drying
Check the characteristics of the refrigerant used and grasp the
special features of the refrigerant. If refrigerant must be charged,
always charge the refrigerant specified for the product.
Confirm the product design pressure.
R410A 609psi (4.20MPa)
Use new refrigerant piping of the thickness specified by the
D&T manual.
Since R410A dedicated tools are necessary, prepare them
in advance.
Absolutely avoid use of existing piping. If use of existing
piping is unavoidable, the piping must be cleaned.
Use of a refrigerant other than the
specified refrigerant will invite
equipment trouble.
Secure the necessary pressure
resistance.
Use pipe that is not dirty inside.
When the pipe is left standing, protect it.
Finish flaring exactly.
Confirm the width across flats dimension and shape of flare nuts.
Always blow nitrogen while brazing.
Perform flushing before connecting the equipment.
Always make the downward slope of the drain pipe 1/100 or
greater and make the horizontal length within 66ft.(20m).
Use hard polyvinylchloride pipe as the drain pipe.
Support the drain pipe between
59-1/16 in(1.5m) to 6-3/4 in ( 2.0m).
Use pipe of 1 rank up (VP30 or greater) as central piping.
Prevention of water leakage
Foreign matter, water, etc. in the
piping will cause faulty cooling and
compressor trouble.
Refrigerant leakage will cause low
performance and abnormal stopping.
Prevention of water leakage
Prevention of water leakage
Refrigerant leakage will cause low
performance and abnormal stopping.
Refrigerant leakage will cause low
performance and abnormal stopping.
Mixing in of vacuum pump oil by
reverse flow will cause equipment
trouble.
Prevents degradation of the oil by
completely removing water and air.
Always use a level and keep the indoor unit level.
If the equipment is tilted toward the drain port, install it so that the tilt is
within 10mm. Excessive tilt will cause water leakage.
When performing piping work, observe the following items so that the
inside of the piping is clean and air tight.
Select the size of the heat insulating material according to the ambient
temperature and relative humidity of the refrigerant.
Use a heat insulating material having a heat conductivity of 0.043W/
(m
.
k) or less.
When making flare connections always use a torque wrench and
tighten the flare nut positively to the specified torque.
Pressurize the product with nitrogen gas up to the design pressure
and conduct a 24Hr air tightness test.
Install a vacuum pump with reverse flow check mechanism or a
reverse flow check adaptor to a conventional vacuum pump and
use.
Pump down sufficiently.
Approximately 1 hour or longer after
500 micron (-100.7kPa) reached.
Allow to stand for approximately 1 hour after stopping the vacuum
pump and confirm that the needle does not return.
Air purging using refrigerant is strictly prohibited.
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Vacuuming mode
This function is used for vacuuming the indoor unit and the connection piping.
When the [vacuuming mode] is set, <Push switch setting, F3:21>
EEV of connected all indoor units opens.
So, the vacuuming indoor unit and piping becomes easier.
When the vacuuming ends, please turn off the power supply for all of the indoor units, RB units
and outdoor unit, [vacuuming mode] is released.
*
recommend the vacuuming
mode
*
Products installation work
*Refer to warning or caution in the attached
installation manual of each products
Note: For starting Vacuuming mode, the refrigerant address setting has to be finished.
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