Refrigeran T Piping Work; Drain Piping Work - Daikin RZVF50 Installation Manual

On completion of installation work, check that there is no gas
leakage. Refer to the illustrations on the right hand side and be sure
to perform heat insulation work on the piping joints after gas leakage.
(Refer Fig.8)
Heat insulation procedure for liquid piping
Insulation for fitting (3)(accessory)
Insulation material
Flare nut joint
for piping
(on unit side)
Make sure that
the seam faces
Attached to
upward.
the surface.
Main unit -�t-'--+---------va
Clamp (7)
(accessory)
Insulation material
for piping (field supply)
Gas pipe
Heat insulation procedure for gas piping
Insulation for fitting (4) (accessory)
Insulation material
for piping
(on unit side)
Clamp (7
(accessory)
Insulation material
for piping (field supply)
Fig. 8
• Use the insulation for fitting (3) and (4)provided to
the liquid piping and gas piping,
respectively and conduct heat insulation work.
(Tighten both edges of the insulation for fitting(3)
and (4)for each joint with clamp(?}.
• Make sure that the joint of the insulation for
fitting(4)and(5)for the joint on the liquid piping
and gas pipingside faces upwards.
• Wrap the middle sealing material (6)around the
insulation for fitting (3)and(4)for the joint
(flare nut part).
-----�
Middle sealing pad (6)
(accessory)
Wrap the insulation material
around the portion from the
surface of the main unit to the
upper part of the flare nut joint.
------�
Middle sealing pad (6)
(accessory)
Wrap the insulation material
around the portion from the
surface of the main unit to the
upper part of the flare nut joint.
41
• Before brazing refrigerant piping, have nitrogen flow
through the refrigerant piping and substitute air with nitro­
(Refer to Fig. 9).
gen (NOTE 1)
(NOTE 2).
After all the brazing works are finished, carry out flare
connection with the indoor unit.
Refrigerant piping
Fig.9
NOTE-a-
1. The proper pressure for having nitrogen flow through the
piping is approximately 0.02 MPa, a pressure that makes
one feel like slight breeze and can be obtained through a
pressure reducing valve.
2. Do not use flux when brazing refrigerant piping.
Use phosphor copper brazing filler metal (BCuP-2: JIS Z
3264/B-Cu93P-710/795: ISO 3677) that does not require
flux.
{If chlorinated flux is used, the piping will be corroded and,
in addition if fluorine is contained, the refrigerant oil will
be deteriorated and the refrigerant circuit will be affected
badly.)
3. When carrying out leakage test of refrigerant piping and
the indoor unit after the installation of indoor unit is fin­
ished, confirm the connecting outdoor unit installation
manual for test pressure.
Refer to also the outdoor unit installation manual or techni­
cal document for refrigerant piping.
4. In case of refrigerant shortage due to forgetting additional
refrigerant charge etc., it will result in malfunction such as
does not cool .
Refer to the outdoor unit installation manual or technical
document for refrigerant piping.
-&
CAUTION----------­
Do not use antioxidant when brazing piping.
It may result in malfunction of components and clogging of
piping due to residue.

7. DRAIN PIPING WORK

(1) Carry out drain piping.
Carry out drain piping so that drainage is ensured.
• Select the piping diameter equal to or larger than
(except for riser) that of the connection piping (polyvi­
nyl chloride piping, nominal diameter 25 mm, outside
diameter 32 mm).
• Install the drain piping as short as possible with down­
ward inclination of 1/100 or more and without such that
(Refer to Fig.10)
air may not stagnate.
Then, carry out brazing
(Refer to Fig.
8)
Pressure reducing valve
Taping
Nitrogen