Daikin REYQ96MTJU, Инструкция по проектированию, установке и испытаниям, Страница: 152 / 236

Refrigerant Piping Si39-406
146 Installation Manual REYQ96MTJU
6. Refrigerant Piping
CAUTION After completing installation, be sure to open the valve.
(See
6-6 Additional refrigerant charge for details) (Operating the unit with the valve shut will
break the compressor.)
Use R410A to add refrigerant. (The R410A refrigerant cylinder has a pink stripe painted around it.)
All field piping must be installed by a licensed refrigeration technician and must comply with
relevant local and national regulations.
CAUTION TO BE TAKEN WHEN BRAZING REFRIGERANT PIPING
Do not use flux when brazing copper-to copper refrigerant piping.
(Particularly for the HFC refrigerant piping) Therefore, use the phosphor copper brazing filter
metal(BCuP) which does not require flux.
(Flux has extremely harmful influence on refrigerant piping systems.
For instance, if the chlorine based flux is used, it will cause pipe corrosion or, in particular, if the flux
contains fluorine, it will damage the refrigerant oil.)
Note:
„
Installation tools:
Make sure to use installation tools (gauge manifold charge hose, etc.) that are exclusively used
for R410A installations to withstand the pressure and to prevent foreign materials (e.g. mineral
oils such as SUNISO and moisture) from mixing into the system.
(The screw specifications differ for R410A.)
Vacuum pump (use a 2-stage vacuum pump with a non-return valve):
1. Make sure the pump oil does not flow oppositely into the system while the pump is not
working.
2. Use a vacuum pump which can evacuate to -14.6 psi.
6.1 Selection of Piping Material
1. Foreign materials inside pipes (including oils for fabrication) must be 9mg/10ft or less.
2. Use the following material specification for refrigerant pipping:
• construction material: Phosphoric acid deoxidized seamless copper for refrigerant.
• size: Determine the proper size referring to chapter “Example of connection”.
• The wall thickness of the refrigerant piping should comply with relevant local and national
regulations.
3. Make sure to use the particular branches of piping that have been selected referring to chapter
“Example of connection”.
6.2 Connecting the Refrigerant Piping
1. The local branch piping can be connected either forward or to the sides (taken out of the
bottom) as shown in the figure.
1 2 3
1. Left-side connection
2. Front connection
3. Right-side connection