Daikin VRV FXKQ32AV16, Installation Manual

Page: 9 / 22

• Before brazing the refrigerant piping, perform nitrogen
replacement first, or charging nitrogen into the refrigerant
piping (Caution 1) during brazing (Caution 2), then
connect with the indoor unit using the flaring.
(Refer to Figure 13)
-Lh
Caution----------------
1. When charging nitrogen into the piping for brazing, set
the pressure to 0.02 MPa (0.2kgf/cm 2 ) using
pressure-reducing valve (as a slight breeze on your
cheek).
2. Do not use flux when brazing the refrigerant piping
connector part. Use the phosphor copper electrode
which does not require flux (BCuP-2:JIS Z 3264 /
BCu93P-710 / 795:ISO 3677). (If the chlorine based
flux is used, it will cause pipe corrosion; if the flux
contains fluorine, it will damage the ester or ether oil
and further adversely affect the refrigerant piping
system.)
3. Make sure to use the following refrigerant piping
Material: Jointless phosphor-deoxidized copper pipe
4. Do not use any anti-oxidants when brazing the piping.
The residual anti-oxidants may clog the piping and
result in malfunction of the parts.
Refrigerant piping
Figure 13
8. Drain piping installation
(1) Install the drain piping.
Refri erant pipin
• Ensure proper drainage of the drain piping installed.
• Diameter of the drain piping must be equal to or greater than
that of the connecting pipes. ( Poly Vinyl Tube ; piping size:
25mm; outer diameter: 32mm)
(Excluding the lifting pipes)
• To prevent the air embolism from being formed, shorten the
drain piping as much as possible and slant it downward. The
gradient should be 1/100 or more.
(Refer to Figure 14)
8
��
Install with the gradient at least 1/100 to prevent the air
embolism from being formed.
Figure 14
-Lh
Caution---------------­
If drain stagnates in the drain piping, the piping may be clogged.
• To prevent the piping from bending and sagging down,
secure them every 1 ~1.5m using slings.
• Use the accessory drain hose
CD
and metal clip ®· The
drain hose
CD
should be inserted till the end of the drain
socket and secured firmly to the marker at the front end of
the hose using the metal clip ®· Tighten the metal clip ®
till the raised distance of the screw head less than 4mm.
(Refer to Figures 15 and 16)
• The following two parts must be insulated to prevent
condensation and dripping.
• Indoor drain hose
• Drain socket
As shown in the figure below, insulate the metal clip ®
and drain hose
CD
with the large insulation material @
(shipped with the unit accessory). tightening torque 1.5±0.1 N.m
(Refer to Figure 16)
Large insulation
material@)
Drain hose CD
Figure 15
Figure 16
<Precautions for installing drainage lifting pipe>
ory)
®
• Make sure the height of the drainage lifting pipe is within
635mm.
• Keep the drainage lifting pipe vertical and maximum 300mm
away from the air conditioner. (Refer to Figure 17)
Adjustable range
(within 635mm)
! Keep level or tilt it upward slightly for installation to
I
' prevent the air from gathering in the drain hose. If the
I
air gathering in, abnormal noise will be caused once
\, t�e drainage flowing back after the drain pump sto�s-)
Figure 17
<Note>
Drain piping connection
• Do not connect it directly to the sewage pipes with
ammonia odour. Ammonia in the sewage pipes may
enter the indoor unit body through the drain piping and
corrode the heat exchanger.
• Do not twist or bend the drain hose
CD,
also do not apply
excessive force. Failure to do so will result in water
leakage.
• To use the converging drain piping, connect in
accordance with Figure 14.
• Select the converging drain piping with proper size in
accordance with the capacity of the unit to be connected.