Daikin REYQ72/96MTJU, Руководство по установке

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Installation EDUS39-605
24 Installation
6. REFRIGERANT PIPING
• After completing installation, be sure to open the valve
as operating the unit with the valve shut breaks the com-
pressor. See Section 6-6,
Additional Refrigerant Charge ,
for details.
• Use only R-410A from the solid pink cylinder.
All field piping must be installed by a licensed refrigeration
technician and must comply with relevant local and national
regulations.
• USE CAUTION WHEN BRAZING REFRIGERANT PIP-
ING
Do not use flux when brazing copper-to-copper refrigerant
piping, particularly HFC refrigerant piping. Instead use
phosphor copper brazing filler metal (B-Cu93P-710/795:
ISO 3677) which does not require flux.
Flux has an extremely negative effect on refrigerant piping
systems and if chlorine-based flux is used, it causes pipe
corrosion. Flux containing fluorine damages refrigerant
oil.
• Installation tools:
Make sure to use installation tools (gauge manifold charge
hose, etc.) that are exclusively used for R-410A installa-
tions to withstand the pressure and to prevent foreign mate-
rials such as SUNISO mineral oils or moisture from mixing
into the system.
Screw thread and dimension specifications for flare nuts,
service valves, and charging ports are different for R-410A
than prior refrigerant types.
Use a 2-stage vacuum pump with a non-return valveand make
sure the pump oil does not flow back into the system while the
pump is not working.
• After completing installation, be sure to open the valve.
Operating the unit with the valve shut breaks the compres-
sor. See Section 6-6, Additional Refrigerant Charge, for
detail
• WHEN BRAZING REFRIGERANT PIPING: Do not use flux
when brazing copper-to-copper refrigerant piping, particu-
larly HFC refrigerant piping. Instead use phosphor copper
brazing filler metal (B-Cu93P-710/795: ISO 3677) which
does not require flux. Flux has an extremely negative effect
on refrigerant piping systems and if chlorine-based flux is
used, it causes pipe corrosion. Flux containing flourine
damages refrigerant oil.
6-1 Selection of piping material
1. Foreign materials inside pipes (including oils for fabrica-
tion) must be 30mg/10m or less.
2. Use the following material specification for refrigerant pip-
ping:
•
construction material: Phosphoric acid deoxidized
seamless copper for refrigerant.
•
size: Determine the proper size referring to Section 6.3
Example of Connection .
•
The wall thickness of the refrigerant piping should com-
ply with relevant local and national regulations.
3. Make sure to use the particular branches of piping that
have been selected referring toSection 6.3
Example of
Connection .
4. Select piping material according to piping size as shown in
the following table:
6-2 Connecting the Refrigerant Piping
1. The local branch piping can be connected either forward, or
to the sides and through the bottom as shown in the follow-
ing figure:
1.
Left-side connection
2.
Front connection
3.
Right-side connectionOne outdoor unit installed
Refer to Figure.
When multiple outdoor units are installed, an optional
multi-piping kit is required to connect piping between units.
Follow the installation manual’s instructions accompanying
the kit.
•
Front connection:
Remove the stop valve cover to connect.
Refer to Figure 6.
•
Side (bottom) connection:
Remove the knockout holes on the bottom frame and route
the piping under the bottom frame.
Refer to Figure 6.
1.
Front connection
2.
Remove the stop valve cover to connect.
3.
Flange
4.
Gas side accessory pipe (1) (2) (3)
5.
Oil-equalizing piping stop valve
6.
No piping work is needed.
7.
Flare nut
8.
Brazing
9.
Liquid side piping (field supply)
10.
Side (bottom) connection
11.
Remove the knockout holes on the bottom frame
and route the piping under the bottom frame.
12.
Knockout hole
13.
Punch the knockout holes.
14.
Gas side piping (field supply)
15.
Oil-equalizing piping (field supply)
NOTE
Be sure to use the attached pipe when carrying out piping
work in the field.
Be sure that the local piping does not touch other pipes,
the bottom panel or side panel. Especially for the bottom
and side connection, be sure to protect the local piping
Piping Size (O/D) Temper grade of Material
φ
15.9 or less O
φ
19.1 or more 1/2 H or H
1 2 3