Vaillant flexoTHERM exclusive VWF 57/4 230V, Installation And Maintenance Instructions Manual

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0020213395_04 Installation and maintenance instructions
17
6 Carrying out the hydraulics installation
Note
You can find the basic system diagrams in the
→
basic diagram book.
1. Flush the heating installation through thoroughly be-
fore connecting the heat pump in order to remove any
residue which could be deposited in the heat pump and
lead to damage.
2. Install the connection pipes free from mechan-
ical stress in accordance with the dimension and
connection drawings.
–
Position the cable holders for securing the heating
circuit and solar circuit piping so that they are not
too close to the heat pump in order to prevent noise
transmission.
–
If required, instead of cable holders, use cold in-
sulation brackets with additional rubber insulation
and, in some cases, reinforced hoses (armoured
rubber hoses).
–
To prevent excessive pressure losses, do not use
stainless steel flexible hoses.
–
If required, use horizontal or right-angled connec-
tion adapters from the accessories.
Note
The heat pump's compressor has two-fold
vibration insulation. This eliminates vibra-
tions in the refrigerant circuit that are inher-
ent in the system. However, under certain
circumstances, residual vibrations may oc-
cur.
3. Attach automatic purging valves to the heating installa-
tion.
6.1 Requirements for the heating circuit
In all heating installations, the minimum volume of circulat-
ing heating water (35% of the nominal volume flow; see tech-
nical data table) must be guaranteed.
In heating installations that are equipped primarily with ther-
mostatic or electrically controlled valves, a constant and suf-
ficient flow through the heat pump must be ensured.
6.2 Connecting the heat pump to the heating
circuit
Caution.
Risk of damage from magnetite depos-
ition.
In heating installations with steel pipes, static
heating surfaces and/or buffer cylinder sys-
tems, magnetite may form where large water
volumes are involved.
▶
Insert a magnetic filter to protect the pump
inside the product.
▶
Take the pressure loss in the magnetite fil-
ter into account when making your selec-
tion.
▶
You must position the filter in direct prox-
imity to the return line to the heat pump.
1. Install a diaphragm expansion vessel at the heat pump
connection provided.
2. Install an expansion relief valve (at least DN 20, open-
ing pressure of 3 bar) with manometer.
3. Install the expansion relief valve hose in a frost-free
environment and ensure that its routing ends in an
open tundish where it is then visible.
4. Install an air/dust separator in the return of the heating
circuit.
5. Connect the heating flow to the heating flow connection
of the heat pump.
6. Connect the heating return to the heating return con-
nection of the heat pump.
7. Insulate all of the pipes in the heating circuit and the
connections for the heat pump so that they are vapour
diffusion-tight in order to prevent them from falling be-
low the dew point in cooling mode.
6.3 Connecting the heat pump to the brine circuit
29
71
≥100 mm
42a
65
A
B
29 Brine pump
42a Brine expansion relief
valve
65 Brine collecting vessel
71 Brine diaphragm expan-
sion vessel
A From the heat source
to the heat pump (hot
brine)
B From the heat pump to
the heat source (cold
brine)
1. Install a brine diaphragm expansion vessel.
2. Check the pre-charge pressure in the brine diaphragm
expansion vessel and then adjust it if required.
3. Install an expansion relief valve for the brine circuit
(3 bar opening pressure).
4. Install an automatic air separator in the brine circuit.
5. Install a brine collecting vessel.
6. Remove the blind caps from the brine connections.
These are no longer required and can be properly dis-
posed of.
7. Connect the brine lines to the heat pump.
8. Insulate all of the brine lines and the connections of the
heat pump so that they are vapour diffusion-tight.
Note
Vaillant recommends that you install the
Vaillant heat pump brine filling unit (not re-
quired when installing the ground water
module). By doing this, it is then possible
to carry out a preparatory partial bleed of the
brine circuit, e.g. for the flow and return of
the brine circuit up to the product.