Daikin VRV FXDQ-PDVE, Инженерные данные

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FXDQ-PDVE(T) / FXDQ-NDVE(T) EDFMT391749
42
3P432203-7B
English 7
7. DRAIN PIPING WORK
CAUTION
•
The connection opening on the drain piping may vary
depending on the model, so check the model name and use
the right method for that model.
•
Make sure all water is out before making the duct connection.
(1) Install the drain piping.
• Make sure the drain works properly.
•
The diameter of the drain piping should be greater than or
equal to the diameter of the connecting pipe (vinyl tube; pipe
size: 20 mm; outer dimension: 26 mm).
(not including the riser)
• Keep the drain piping short and sloping downwards at a
gradient of at least 1/100 to prevent air pockets from forming.
(Refer to Fig. 10)
CAUTION
Water accumulating in the drain piping can cause the
drain to clog.
• To keep the drain piping from sagging, space hanging
bracket every 1 to 1.5 m.
•
Use the drain hose (2) and the metal clamp (1). Insert the
drain hose (2) fully into the drain socket and firmly tighten the
metal clamp (1) with the upper part of the tape on the hose
end. Tighten the metal clamp (1) until the screw head is less
than 4 mm from the hose.
(Refer to Fig. 11, 12)
• The two areas below should be insulated because
condensation may form there causing water to leak.
•
Drain piping passing indoors
• Drain socket
Referring the figure below, insulate the metal clamp (1) and
drain hose (2) using the included large sealing pad (5).
(Refer to Fig. 12)
In case of PDVE, NDVE type (with drain pump)
Drain socket
Refrigerant pipes
Service drain hole
(with rubber cap)
600mm or less
Central drain piping
(with a slope of at least 1/100)
Fig. 10
CAUTION
Be sure to insulate any field piping all the way to the piping
connection inside the unit. Any exposed piping may cause
condensation or burns if touched.
• When brazing the refrigerant piping, perform nitrogen
replacement first, or perform the brazing (CAUTION 2) while
feeding nitrogen into the refrigerant piping (CAUTION 1), and
finally connect the indoor unit using the flare connections.
(Refer to Fig. 9)
CAUTION
1. When brazing a pipe while feeding nitrogen inside the
pipe, make sure to set the nitrogen pressure to 0.02 MPa
(0.2 kg/cm
2
) using the pressure reducing valve. (This
pressure is such that breeze is blown to your cheek.)
2. Do not use a flux when brazing the refrigerant pipe joints.
Use phosphor copper brazer (BCuP-2: JIS Z 3264/B-
Cu93P-710/795: ISO 3677) which does not require flux.
(Using a flux containing chlorine may cause the piping to
corrode. Using a welding flux containing fluorine may
cause the refrigerant lubricant to deteriorate, and affect
adversely the refrigerant piping system.)
Not recommendable 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 installation
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, there
is a point where the tightening torque suddenly increases. From
that position, further tighten the flare nut the angle shown below:
Table 2
Pipe size Further tightening angle
Recommended arm
length of tool
φ
6.4 (1/4”) 60 to 90 degrees Approx. 150 mm
φ 9.5 (3/8”) 60 to 90 degrees Approx. 200 mm
φ
12.7 (1/2”) 30 to 60 degrees Approx. 250 mm
φ
15.9 (5/8”) 30 to 60 degrees Approx. 300 mm
Refrigerant piping
Part to be brazed
Taping
Pressure-reducing valve
hands
valve
Nitrogen
Nitrogen
Fig. 9