Installation Of The Outdoor Unit; Selecting The Assembly Location; Planning The Refrigerant Return; Connection Of The Refrigerant Pipes - Vaillant VAI 6-025 WN Installation Manual

10 Installation of the outdoor unit

10.1

Selecting the assembly location

a WARNING!
Outdoor units must be placed in accessible
areas for subsequent maintenance and repair
operations.
• Vaillant will not be responsible for any costs
derived from incorrect positioning that prevents
easy access.
e DANGER of personal injury and material
damage from explosion!
Danger of burns and eye injuries.
• When brazing or soldering pipe lines, use suitable
protection equipment (protective eye protection
and mask, welding gloves, flame proof clothing).
e DANGER of personal injury and material
damage from collapse!
• Ensure that the ground is smooth and level and
can withstand the weight of the outdoor unit.
WARNING!
a
Danger of corrosion.
• Do not install the unit near to corrosive materials:
- The outdoor unit can only be mounted outdoors, never
inside a building.
- Do not install the unit in such a way that the air discharge
affects the air inlets of other nearby equipment.
- If possible avoid direct sunlight.
- Ensure that the ground has sufficient rigidity to avoid
vibrations.
- Ensure that there is sufficient space to observe the
minimum distances (see Figure 8.1).
- Ensure that neighbours are not disturbed by draughts or
noise.
- If the premises are rented obtain the owner's consent.
- Comply with local regulations: there are considerable
differences dependant on the area.
- Leave enough space to fit the condensed water drainage
pipe (see section 10.4).
VAI 6 WN-I_EN - 06/14 - Vaillant
10.2

Planning the refrigerant return

The refrigerant circuit contains a special oil to lubricate the
outdoor unit compressor. To assist the return of the oil to the
compressor the following is recommended:
- that the indoor unit is located higher than the outdoor unit
and,
- that the suction pipe (the thickest one) is assembled with
a gentle slope towards the compressor.
If the outdoor unit is mounted higher than the indoor unit,
the suction pipe must be mounted in a vertical position. At
heights exceeding 7.5 m (where this is permissible):
- every 7.5 m additionally install an oil trap in which the oil
can be collected and vacuumed back to the outdoor unit,
and
- install an elbow in front of the outdoor unit to facilitate the
return of the lubricant.
10.3

Connection of the refrigerant pipes

i NOTE!
Installation is easier if the gas suction pipe is con-
nected up first. The suction pipe is the thickest one.
• Mount the outdoor unit in the required position.
• Remove the flare nuts and bonnets from the shut off in the
outdoor unit.
• Carefully bend the installed pipe towards the outdoor unit.
a WARNING!
Danger of breakdowns or malfunction.
Danger of damage in the refrigerant pipes.
• Bend the pipe carefully to prevent kinks or
breaks.
• Cut the pipes, leaving enough extra piping hanging over to
enable the unit to be connected at the outdoor unit joins.
• Flare the refrigerant pipe after first placing the flare nut on
the pipe.
• Join the refrigerant pipes to the corresponding outdoor
unit connection.
• Insulate the refrigerant piping correctly and separately. To
do so, cover any joins in the insulation with masking tape
or insulate any bare coolant piping with the corresponding
insulation material suitable for Air to Air heat pumps.
INSTALLATION
EN
13