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Installation
EDUS39-605
51
Installation of Outdoor Units
FLARE SHAPE and FLARENUT TIGHTENING TORQUE
Precautions when connecting pipes:
•
When connecting the flare nuts, apply refrigerant oil to the
inside and outside of the flares and turn them three or four
times at first. (Use ester oil or ether oil.)
•
See the following table for tightening torque.
(Applying too much torque may cause the flares to crack.)
•
After all the piping has been connected, use nitrogen to
perform a gas leak check.
•
See the following table for flare machining dimensions:
Not recommended but in case of emergency:
You must
use a torque wrench but if one is not available, use the fol-
lowing installation method:
When tightening the flare nut with a spanner, there is a point
where the tightening torque suddenly increases. From that
position, further tighten the flare nut the angle shown below:
(in.)
After the work is finished, ensure there is no gas leak.
Disposal requirements
Dismantling the unit and treatment of the refrigerant, oil, and
other parts, must be done in accordance with the relevant
local and national regulations.
Pipe insulation
After finishing the leak test and vacuum drying, the piping
must be insulated. Take into account the following points:
•
Be sure to thoroughly insulate the connection piping and
refrigerant branch kits.
•
Be sure to insulate the liquidside, suction gasside and dis-
charge gasside piping for the inter-unit piping and the
refrigerant branch kits. For multiple outdoor units, always
insulate the oil pressure equalizer.
Not insulating piping can cause leaking. The gas piping
can reach temperatures of 250°F so ensure 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 using insulation at least 13/16” thick. Con-
densation may form on the surface of the insulation.
•
Any 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, must be prevented by measures such as
caulking the connections. .
(Refer to
figure 11, page 38)
1.
Liquid line stop valve
2.
Suction gas line stop valve
3.
Discharge gas line stop valve
4.
Outer-to-inner interconnecting piping
5.
Caulking treatment
6.
Heat insulator
7.
Oil-equalizing line stop valve
8.
Oil-equalizing line
CAUTION
•
Be sure to insulate local pipes, as touching them can
cause burns.
Additional refrigerant charge
CAUTION
•
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, Section 6-4.
•
Prevent liquid slugging by never exceeded the maxi-
mum permissable charge when charging a system.
•
Refrigerant containers must be opened slowly.
TO AVOID COMPRESSOR BREAKDOWN, DO NOT
CHARGE THE REFRIGERANT MORE THAN THE SPECI-
FIED AMOUNT FOR RAISING THE CONDENSING PRES-
SURE.
•
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. To ensure normal sys-
tem operation, the refrgerant must be charged in its liquid
state to the liquid pipe.
•
Before filling, check if the tank has a siphon attached.
How to fill a tank with a siphon attached:
Other ways of filling the tank
•
Determine the amount of refrigerant to be added by refer-
ring to the table, write it on the included “Added Refriger-
ant” plate and attach it to the rear side of the front cover.
Note: refer to the example of connection for the amount to
be added.
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
φ
3/8”
60 to 90 degrees
Approx. 7-7/8
φ
1/2”
30 to 60 degrees
Approx. 9-13/16
φ
5/8”
30 to 60 degrees
Approx. 11-13/16
φ
3/4”
20 to 35 degrees
Approx. 17-3/4
R=0.016-0.031
45 ±2
90 ±2
A
There is a siphon tube
inside, so there is no need
to turn the tank upside-down.
Fill with the tank upright.
There is a siphon tube
inside, so there is no need
to turn the tank upside-down.
Fill with the tank upright.