Hydraulics Installation; Preparing Work On The Refrigerant Circuit; Planning The Routing Of The Refrigerant Pipes - Vaillant aroTHERM VWL 35/5 AS 230V S2 Operating Instructions Manual

4.13.7 Installing the casing sections
1. When installing, carry out the steps for removal in re-
verse.
2. To do this, follow the figures for the removal
(→ Section 4.13.1).
5

Hydraulics installation

5.1

Preparing work on the refrigerant circuit

Danger!
Risk of injury and risk of environmental
damage due to escaping refrigerant.
Touching any escaping refrigerant may
cause injury. Escaping refrigerant leads
to environmental damage if it reaches the
atmosphere.
▶
Only carry out work on the refrigerant cir-
cuit if you have been trained to do so.
Caution.
Risk of material damage when extracting
refrigerant.
When extracting refrigerant, there is a risk of
material damage caused by freezing.
▶
Ensure that heating water flows through
the indoor unit's condenser or it is com-
pletely drained when extracting refrigerant
on the secondary side.
1. The outdoor unit is pre-filled with R410A refrigerant.
Determine whether additional refrigerant is required.
2. Ensure that the two isolation valves are closed.
3. Purchase suitable and appropriate refrigerant pipes in
accordance with the technical data.
4. Ensure that the refrigerant pipes that are used comply
with these requirements:
–
Special copper pipes for the refrigeration techno-
logy
–
Thermal insulation
–
Weather resistance and UV resistance.
–
Protection against rodent bites.
–
Flaring with 90° flare in accordance with the SAE
standard
5. Keep the refrigerant pipes blocked until they are in-
stalled.
6. Purchase the necessary tools and equipment:
Always required
–
Flaring tool for 90° flare
–
Torque spanner
–
Refrigerant fitting
–
Nitrogen cylinder
–
Vacuum pump
–
Vacuum gauge
0020257297_07 Installation and maintenance instructions
May be required
–
Refrigerant cylinder with
R410A
–
Refrigerant scales
5.2

Planning the routing of the refrigerant pipes

5.2.1 Outdoor unit above indoor unit
1
4
3
1 Outdoor unit
2 Indoor unit
The outdoor unit can be installed up to a maximum height
difference H of 30 m above the indoor unit. In this case, a
refrigerant pipe with a maximum length of 40 m is permitted.
Depending on the height difference, oil elevation elbows
must be installed in the hot gas pipe
Height difference H Oil elevation elbow
up to 10 m No oil elevation elbow required
Up to 20 m One oil elevation elbow at 10 m high
Above 20 m One oil elevation elbow at 10 m high,
one additional oil elevation elbow at 20
m high
The oil elevation elbow must comply with these geometric
requirements.
Product Outer diameter,
hot gas pipe
VWL 35/5 and 1/2 "
VWL 55/5
VWL 75/5 to 5/8 "
VWL 125/5
H
2
3 Hot gas pipe
4 Oil elevation elbow
A
R
B
R
A B R
173 40 40
256 40 60
61