Refrigerant Pipe Size And Allowable Pipe Length; Selection Of Piping Material; Refrigerant Pipe Size; Allowable Pipe Length And Height Difference - Rotex RRRQ011AAV1 Installationsanleitung

Installation
For installation of the indoor unit, refer to the indoor unit
installation manual.
Refer to the Engineering Data Book for the complete list of
technical and electrical specifications.
Never operate the unit with the discharge pipe thermistor (R2T),
suction pipe thermistor (R3T) and pressure sensors (S1NPH,
S1NPL) removed. Such operation may burn out the compressor.
Be sure to confirm the model name and the serial no. of the
outer (front) plates when attaching/detaching the plates to avoid
mistakes.
When closing the service panels, take care that the tightening
torque does not exceed 4.1 N•m.
5. R
EFRIGERANT PIPE SIZE AND ALLOWABLE
PIPE LENGTH
Piping and other pressure containing parts shall
comply with the applicable national and international
regulations and shall be suitable for refrigerant. Use
phosphoric acid deoxidised seamless copper for
refrigerant.
Installation shall be done by a licensed refrigerant
technician, the choice of materials and installation
shall comply with
regulations. In Europe the EN378 is the application
standard that shall be used.
To persons in charge of piping work:
Be sure to open the stop valve after piping installing
and vacuuming 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.

5.1. Selection of piping material

Foreign materials inside pipes (including oils for fabrication)
must be ≤30 mg/10 m.
Construction material: phosphoric acid deoxidized 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
relevant local and national regulations. The minimal pipe
thickness for R410A piping must be in accordance with the table
below.
Temper grade
Pipe size (mm) of piping material
Ø9.5
Ø15.9
O = Annealed
In case the required pipe sizes (inch sizes) are not available, it is
also allowed to use other diameters (mm sizes), taken the
following into account:
select the pipe size nearest to the required size.
use the suitable adapters for the change-over from inch to
mm pipes (field supply).
Installation manual
6
national and international
Minimal thickness
(mm)
O 0.80
O 1,00

5.2. Refrigerant pipe size

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

5.3. Allowable pipe length and height difference

See the table below concerning lengths and heights. Refer to
figure 1. 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 (m)
Maximum total one-way piping length
Maximum height between indoor and outdoor
Chargeless length
(a) Parenthesized figure represents the equivalent length.

5.4. Guidelines for necessity of a trap

Since there is fear of the oil held inside the riser piping flowing back
into the compressor when stopped and causing liquid compression
phenomenon, or cases of deterioration of oil return, it will be
necessary to provide a trap at an appropriate place in the riser gas
piping.
A B
E
C
D
A trap is not necessary when the outdoor unit is installed in a higher
position than the indoor unit.
Refrigerant pipe size (mm)
Ø15.9
Ø9.5
(a)
L 50 (95)
H 30
≤10
L
A Outdoor unit
B Indoor unit
C Gas piping
D Liquid piping
E Oiltrap
H Install trap at
each difference in
height of 10 m.
RRRQ011~016AAV1+Y1
Outdoor unit for air to water heat pump
4PW55782-1