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If there is a pressure drop, check for leaks, make repairs and perform
the air tight test again.
acuum drying
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pipe and liquid pipe stop valve service ports by using a vacuum pump
for more than 2 hours and bring the system to 500 microns or less.
After keeping the system under that condition for more than 1 hour,
check if the vacuum gauge rises or not. If it rises, the system may
either contain moisture inside or have leaks.
NOTE
During the rainy season, moisture might enter the piping. If
working during a rainy season and the work takes long enough
for condensation to form inside the pipes, take the following
precautions:
After evacuating the system for 2 hours, pressurize the system to
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system again using the vacuum pump for 1 hour to 500 microns or
less (vacuum drying).
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repeat the operation of vacuum break and vacuum drying.
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vacuum gauge does not rise.
11. Pipe insulation
NOTE
Pipe insulation thickness provided below are guidelines only. Pipes
must be insulated with the appropriate thickness of insulation per ap-
plicable local/state or national codes.
Insulation of pipes should be done after performing 10. Air tight test
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Always insulate the suction gas pipe, high/low pressure gas pipe,
liquid pipe and pipe connections.
Failing to insulate the pipes may cause leaking or burns.
Be sure to use insulation designed for HVAC equipment.
Reinforce the insulation on the refrigerant piping according to the
installation environment. Condensation might form on the surface of
the insulation. Refer to the below.
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minimum thickness : 9/16 in. (15 mm).
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oo or
If there is a possibility that condensation on the stop valve might
drip down into the indoor unit through gaps in the insulation and
piping because the outdoor unit is located higher than the indoor
unit, this must be prevented by caulking the connections. (Refer to
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3P362438-5N English
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1 Insulation material
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2 Caulking, etc.
3 Liquid pipe stop valve
4 Suction gas pipe stop
valve
5 High/low pressure gas
pipe stop valve
6 Connection pipe
12. Checking of device and installation conditions
Be sure to check the followings.
For those doing electrical work
1 Make sure there is no faulty transmission wiring or loosening of a
nut.
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2 Make sure there is no faulty power wiring or loosening of a nut.
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3 Has the insulation of the main power circuit deteriorated?
Measure the insulation and check the insulation is above regular
value in accordance with relevant local and national regulations.
For those doing pipe work
1 Make sure piping size is correct.
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2 Make sure insulation work is done.
See 11. Pipe insulation.
3 Make sure there is no faulty refrigerant piping.
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13. Ma ing field settings
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some input to the printed circuit board of the unit. This chapter will
describe how manual input is possible by operating the push buttons/
DIP switches on the printed circuit board and reading the feedback
from the 7 segment displays.
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(for this, option 999482P3 is required). The installer can prepare the
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to the system. How to connect the cable is described in
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13.1. Accessing the push buttons on the printed circuit
board
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push buttons on the printed circuit board and read out the 7 segment
display (s).
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see 3 push buttons and 3 seven-segment displays and DIP switches.
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