Refrigerant Pipe Size And Allowable Pipe Length; Selection Of Piping Material; Refrigerant Pipe Size; Allowable Pipe Length And Height Difference - Rotex RRLQ011CAV3 Manual De Instalación

8. R
EFRIGERANT PIPE SIZE AND ALLOWABLE
PIPE LENGTH
DANGER
■
Piping and other pressure containing parts shall
comply with the applicable legislation and shall be
suitable for refrigerant.
deoxidised seamless copper for refrigerant.
■
Installation shall be done by a licensed refrigerant
technician, the choice of materials and installation
shall comply with applicable legislation. In Europe the
EN378 is the application standard that shall be used.
NOTICE
To persons in charge of piping work:
Be sure to open the stop valve after piping installing and
vacuming is complete. (Running the system with the valve
closed may break the compressor.)
It is forbidden to discharge refrigerant into the atmosphere.
Collect the refrigerant in accordance with the freon
collection and destruction law.

8.1. Selection of piping material

■
Construction material: phosphoric acid deoxidised seamless
copper for refrigerant.
■
Temper grade: use piping with temper grade in function of the
pipe diameter as listed in table below.
■
The pipe thickness of the refrigerant piping should comply with
applicable legislation. The minimal pipe thickness for R410A
piping must be in accordance with the table below.
Temper grade
Pipe Ø of piping material
9.5 O
15.9 O
O=Annealed

8.2. Refrigerant pipe size

The pipes between outdoor unit and indoor unit should have the
same size as the outdoor connections.
Gas pipe
Liquid pipe

8.3. Allowable pipe length and height difference

See the table below concerning allowable lengths and heights. Refer
to figure 2. 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.
For RRLQ
Allowable pipe length
Maximum total one-way piping length
L
Maximum height between indoor and outdoor
H
Chargeless length
L
(a) Parenthesized figure represents the equivalent length.
Installation manual
10
Use phosphoric acid
Minimal thickness t (mm)
0.80
1.00
Refrigerant pipe size (mm)
Ø15.9
Ø9.5
(a)
50 m (70 m)
30 m
10 m
9. 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,
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.
Great caution is needed when passing copper tubes through
walls.
Place Installation period
More than a month
Outdoor unit
Less than a month
Regardless of the
Indoor unit
■
Piping should be mounted so that the flare is not subjected to
mechanical stress.

9.1. Flaring guidelines

■
Flares should not be re-used. New ones should be made in
order to prevent leaks.
■
Use a pipe cutter and flare tool suitable for the refrigerant used.
■
Only use the flare nuts included with the unit. Using different
flare nuts may cause the refrigerant to leak.
■
Please refer to the table for flaring dimensions and tightening
torques (too much tightening will result in splitting the flare).
Piping size Tightening
(mm) torque (N•m)
Ø9.5 33~39
Ø15.9 63~75
■
When connecting the flare nut, coat the flare inner surface with
ether oil or with ester oil and initially tighten 3 or 4 turns by hand
before tightening firmly.
Protection method
Pinch the pipe
Pinch or tape the pipe
period
Flare dimensions A Flare shape
(mm) (mm)
90 ±2
12.8~13.2
A
R=0.4~0.8
19.4~19.7
RRLQ011~016CAV3+W1
Outdoor unit for air to water heat pump
4PW57794-1 – 10.2010