Daikin RZQ71~125B7V3B, Service Manual, Page: 88 / 484

Functional Diagrams ESIE04-01
1–66 Part 1 – System Outline
3
11
4
5
Precautions on
refrigerant piping
P
Do not allow anything other than the designated refrigerant to get mixed into the freezing cycle (air,
moisture,... ). If any refrigerant gas leaks while working on the unit, ventilate the room thoroughly
immediately.
P
Use R410A only when adding refrigerant.
P
Make sure all installation tools are designed for use on R410A refrigerant to withstand the
pressure.
P
Vacuum pump. Use a 2-stage vacuum pump with a non-return valve. Make sure the pump oil does
not flow oppositely into the new system while the pump is not working. Use a vacuum pump which
can evacuate to -100.7 kPa (5 Torr, -755 mmHg).
P
Check welded connections for gas leaks, if the local piping has welded connections.
Notes for Twin,
Triple and Double
Twin
P
Main piping (L1) can be re-used, size up & size down is allowed (see further in this section for
restrictions).
P
Re-use of branch piping is not allowed.
P
Branch piping (L2~L7) can be re-used, but standard pipe size only.
Selection of piping
material
P
Construction material: phosphoric acid deoxidized seamless copper for refrigerant.
P
Temper grade: use piping with temper grade in function of the pipe diameter as listed in table
below.
P
The pipe thickness of the refrigerant piping should comply with relevant local and national
regulations. The minimal pipe thickness for R410A piping must be in accordance with the table
below.
Ο
= Annealed
1/2H = Half hard
H1
L1
H1
H2
L3 L1
L2
H1
H2
L4 L1
L3
L2
H1
H2
L7 L1
L6
L5
L4
L3
L2
Pair Twin Triple Double twin
Pipe
φ
Temper grade of piping material Minimal thickness t(mm)
6.4 / 9.5 / 12.7
Ο
0.80
15.9 O 1
19.1 1/2H 1
RZQ - Final.book Page 66 Wednesday, September 8, 2004 8:40 AM