Daikin FDMA125AV16 Installation Manual page 31

.REFRIGERANT PIPING WORK (4/5)
( How to operate the stop valve ) (Refer to Fig. 1 O)
Use hexagonal wrenches 5mm.
To open:
1. Insert one hex-wrench onto the valve rod and turn counter-clockwise.
2. Stop when the valve rod no longer turns. It is now open.
To close:
1. Insert one hex-wrench on the valve rod and turn clockwise.
2. Stop when the valve rod no longer turns. It is now closed.
(PRECAUTIONS FOR HANDLING VALVE CAP)
• A seal is attached to the point indicated by the arrow. Take care not to damage it.
• Be sure to tighten the valve cap securely after operating the valves.
Valve size (mm) Tightening torque(N•m)
Liquid side
09.5
(PRECAUTIONS FOR HANDLING SERVICE PORT)
• Use a push-rod provided charging hose for operation.
• Be sure to tighten the valve cap securely after operation.
Do not use a charging hose of which pressing stick is slipped out from the center.
(S)
Proh;Med (I t may cause refrigerant leakage due to deformation fo the v a lv e stem of the service port)
(PRECAUTIONS FOR CONNECTING PIPING)
• Take caution so that the refrigerant piping between the outdoor and indoor may not touch the compressor bolt and sound proof
cover and the plate as shown Fig 12.
• If installing the outdoor unit higher than the indoor unit, caulk the space around insulation and tubes because condensation on
the stop valves can seep through to the indoor unit side.
(PRECAUTIONS REGARDING INSULATION)
Enhance the insulation of the refrigerant piping according to the
installation conditions. If this is not done, condensation may form on the
surface of the insulation. Please refer to the target values shown below.
• When the temperature and humidity conditions are 30
thickness of the insulation is 15 mm or more.
• When the temperature and humidity conditions are 30
thickness of the insulation is 20 mm or more.
• Be sure to insulate the liquid and gas sides interunit piping.
It may become the cause of refrigerant leakage if it is not insulated.
(Be sure to use insulating material which can resistant.)
Insulation of interunit piping must be carried out up to the
connection inside the casing.
� •
If the piping is exposed to the atmosphere, it may cause sweating
CAUTION or burn due to touching the piping, electric shocks or a fire due to
the wiring touching the piping.
(P RECAUTIONS WHEN TIGHTENING FLARE NUTS )
• Be sure to remove the flare nuts with two spanners.
Then after the piping connection, tighten them using a spanner and torque wrench.
• For the dimension of flared part, see the table 1.
• When making a flare connection. coat ether or ester oil only to the flare inner surface.
Then, turn the nut 3 to 4 times with your hand and screw in the nut.
Pi in connection
• For the tightening torque, see the table 1.
• After all the piping has been connected, use nitrogen to perform a refrigerant leakage test.
Table 1
P I P I N G SI Z E
T I GHTE NI N G TORQUE PROCESSI N G FLARES (mm)
(mm)
06.4
16±2N•m
09.5
22±2N•m
012.7
32±2N•m
015.9
50±2N•m
019.1
70±2N•m
If there is no torque wrench, use table 2 as a rule of thumb. When tightening a flare nut with a spanner harder and harder, there is a
point where the tightening torque suddenly increases. From that position, tighten the nut additionally the angle shown in table 2. After
the work is finished, check securely that there is no gas leakage. If the nut is not tightened as instructed, it may cause slow refrigerant
leakage and result in malfunction(such as does not cool /heat).
�
Valve size (mm) Tightening torque(N•m)
Gas side
22.0 ± 2
Spanner
Tor ue wrench
A DI M E N SI O NS FOR
FLARE SHAPE
8.9 ± 0.2
13.0 ± 0.2
0
16.4 ± 0.2
�
19.5 ± 0.2
�
23.8 ± 0.2
)
<Liquid side>
- - - � - - - - - - - �
015.9 32.0 ± 3
Tightening tor ue(N•m)
32.0 ± 3
°
C and RH 75% or more:
°
C and RH 80% or more:
Perform treatment
such as caulking
Insulation
field su I
Insulation around the piping
section so it is not exposed
and then cover the
insulation with vin I ta e.
Coat the flare inner surface only
Union joint
with Ester oil or ether oil
Flare nut
Table 2
PIPI N G SIZE
(mm)
06.4
09.5
�
012.7
�
015.9
""""'"
Flare shape
019.1
30
Fig.10
<Gas side>
Valve cap
Stop valve (cap attachment)
lnterunit piping for the
indoor and outdoor units
Compressor
Fig.12 Refrigerant piping must be protected
from physical damage. I nstall a plastic
cover or equivalent.
FURTHER TIGHTENI N G RECOMMENDE D ARM
LENGTH OF TOOL
ANGLE
60 to 90 degrees About 150 mm
60 to 90 degrees About 200 mm
30 to 60 degrees About 250 mm
30 to 60 degrees About 300 mm
20 to 35 degrees About 450 mm
Fig.11