Precautions On Refrigerant Piping - Daikin RZQ100B9V3B Installation Manual

Allowable pipe length and height difference
See the table below concerning lengths and heights. Refer to figures
2, 3, 4 and 5. Assume that the longest line in the figure corresponds
with the actual longest pipe, and the highest unit in the figure
corresponds with the actual highest unit.
Allowable pipe length
Allowable pipe length
Liquid pipe
Maximum total one-way piping length
Pair L1 size-down
standard
size-up
• Twin and triple • L1+L2 size-down
• Double twin • L1+L2+
L4 standard
size-up
Maximum allowable piping length
Twin L1+L2+L3
Triple L1+L2+L3
+L4
Double twin L1+L2+L3
+L4+L5+
L6+L7
Maximum branch piping length
• Twin and triple • L2
• Double twin • L2+L4
Maximum difference between branch lengths
Twin L2–L3
Triple L2–L4
Double twin • L2–L3
• L4–L5
• L6–L7
• (L2+L4)–
(L3+L7)
Maximum height between indoor and outdoor
All H1
Maximum height between indoors
Twin, triple and H2
double twin
Chargeless length
All L1+L2+L3 size-down
+L4+L5+
standard
L6+L7
size-up
(a) Parenthesized figure represents the equivalent length.
RZQ71~125B9V3B + RZQ100~140B8W1B
Split System air conditioners
4PW23691-1A
Model
size 71 100 125
10 m (15 m)
50 m
75 m (95 m)
(70 m)
25 m
35 m (45 m)
(35 m)
10 m (15 m)
50 m
75 m (95 m)
(70 m)
25 m
35 m (45 m)
(35 m)
(a)
60 m
75 m
—
—
—
— 20 m
10 m
10 m
—
—
—
— 30 m
— 0.5 m
≤10 m
≤30 m
≤15 m
Existing or pre-installed piping can be used
1. Piping must comply with the criteria below.
• Pipe diameter must comply with the limitations as indicated in
paragraph
• Piping length must be within limits of the allowable piping length
as in paragraph
page 6.
• Piping must be designed for R410A. See paragraph
piping material" on page
140
2. Piping can be reused without cleaning when:
• Total 1-way piping length: <50 m.
• No compressor breakdown has occured in the history of the unit
to be replaced.
• A correct pump down operation can be executed:
- Operate the unit continuously for 30 minutes in cooling
mode.
- Execute a pump down operation.
- Remove the airconditioning units to be replaced.
• Check the contamination inside the existing piping.
If you cannot meet all these requirements, the existing pipes must be
cleaned or replaced after removing the air conditioning units to be
replaced.
3. Prepare the flare connections for higher pressure. See paragraph
"Cautions for flare connection" on page
75 m
P
RECAUTIONS ON REFRIGERANT PIPING
Do not allow anything other than the designated refrigerant to
get mixed into the freezing cycle, such as air, etc. If any
refrigerant gas leaks while working on the unit, ventilate the
room thoroughly right away.
Use R410A only when adding refrigerant
Installation tools:
Make sure to use installation tools (gauge manifold charge hose,
10 m
etc.) that are exclusively used for R410A installations to
withstand the pressure and to prevent foreign materials (e.g.
mineral oils and moisture) from mixing into the system.
Vacuum pump:
Use a 2-stage vacuum pump with a non-return valve
Make sure the pump oil does not flow oppositely into the system
while the pump is not working.
Use a vacuum pump which can evacuate to –100.7 kPa (5 Torr,
–755 mm Hg).
In order to prevent dirt, liquid or dust from entering the piping,
cure the piping with a pinch or taping.
Place
Outdoor unit
Indoor unit
Great caution is needed when passing copper tubes through
walls.
"Refrigerant pipe size" on page
"Allowable pipe length and height difference" on
5.
8.
Installation period
More than a month
Less than a month
Regardless of the
period
5.
"Selection of
Protection method
Pinch the pipe
Pinch or tape the pipe
Installation manual
6