Installation
EDUS39-605
29
Installation of Outdoor Units
•
After all the piping has been connected, use nitrogen to
perform a gas leak check.
Not recommended but in case of emergency
You must use a torque wrench but if you are obliged to install
the unit without a torque wrench, you may follow the installa-
tion method mentioned below.
After the work is finished, make sure to
check that there is no gas leak.
When you keep on tightening the flare nut with a spanner,
thereis a point where the tightening torque suddenly
increases. From that position, further tighten the flare nut
the angle shown below:
Disposal requirements
Dismantling of the unit, and treatment of the refrigerant,
oil and eventual parts, should be done in accordance with
the relevant local and national regulations.
6-5 Pipe insulation
After finishing the leak test and vacuum drying, the pip-
ing must be insulated. Take into account the following
points:
•
Make sure to insulate the connection piping and refrigerant
branch kits entirely.
•
Be sure to insulate the liquid-side and gas-side piping for
the inter-unit piping and the refrigerant branch kits. For mul-
tiple outdoor units, always insulate the oil pressure equal-
izer.
Not insulating them may cause leaking. The gas piping can
reach temperatures of 248°F. Be sure the insulation used
can withstand such temperatures.
•
If you think the humidity around the cooling piping might
exceed 86°F and RH80%, reinforce the insulation on the
cooling piping ensuring it is at least 13/16” thick. Conden-
sation might form on the surface of the insulation.
•
If there is a possibility that condensation on the shut-off
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, etc., this must be pre-
vented by corking the connections, etc.
Refer to figure 11.
1.
Liquid line stop valve
2.
Gas line stop valve
3.
Outer-to-inner interconnecting piping
4.
Calking treatment, etc.
5.
Heat insulator
6.
Oil-equalizing line stop valve
WARNING
Be sure to insulate local pipes, as touching them can cause
burns.
6-6 Additional refrigerant charge
WARNING
•
To avoid injury always use protective gloves and eye pro-
tection when charging refrigerant.
•
To avoid injury do not charge with unsuitable substances.
Use only the appropriate refrigerant.
NOTE
Refrigerant cannot be charged until field wiring has been
completed.
Refrigerant may only be charged after performing the leak
test and the vacuum drying.
When charging a system, care shall be taken that its max-
imum permissible charge is never exceededto prevent the
danger of liquid hammer.
Refrigerant containers should be opened slowly.
TO AVOID COMPRESSOR BREAKDOWN. DO NOT
CHARGE THE REFRIGERANT MORE THAN THE SPEC-
IFED AMOUNT TO RAISE THE CONDENSING PRESSURE.
•
This outdoor unit is factory charged with refrigerant and
depending on pipe sizes and pipe lengths some systems
require additional charging of refrigerant.
•
Charge the refrigerant to the liquid pipe in its liquid state.
Since R-410A is a mixed refrigerant, its composition
changes if charged in a state of gas and normal system
operation would no longer be assured.
pipe size
(in.)
tightening
torque (ft. Ibf)
A (in.)
flare shape (in.)
φ
3/8”
24.1 - 29.4
0.504 - 0.520
φ
1/2”
36.5 - 44.5
0.638 - 0.654
φ
5/8”
45.6 - 55.6
0.760 - 0.776
Pipe size
Further tightening angle
Recommended arm length of tool
3/8”
60 to 90 degrees
Approx. 7-7/8”
1/2”
30 to 60 degrees
Approx. 9-13/16”
5/8”
30 to 60 degrees
Approx. 11-13/16”
R=0.016-0.031
45 ±2
90 ±2
A
Содержание REYQ72/96MTJU
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