Bedienungsanleitung Vaillant aroTHERM VWL 85-2 (Seite 15 von 52) (Englisch)

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Assembly and installation 5

0020147164_04 aroTHERM Installation instructions 15

1. Insulate the lines (including those running below

ground) with UV-resistant and high-temperature-res-

istant insulation between the product and the heating

installation.

2. In order to avoid transferring vibrations to the surround-

ing buildings, use flexible connection pipes on the

product that have a length of at least 0.75 m.

3. When the product is not installed at the highest point in

the heating circuit, install additional purging valves in

suitable places.

4. Install the following accessories in the heating return.

Installation without decoupling hydraulic module

– Drain cock

– Air separator (if required)

– Dirt filter

– An expansion vessel suitable for the complete hydraulic

installation

– Expansion relief valve 0.3 MPa (3 bar)

– Pressure gauge (recommended)

Note

If you use glycol, you must collect it at the

expansion relief valve to prevent environ-

mental pollution.

0.75 m min.

1 Connection hose in the

heating flow to the building

(on-site)

2 O-ring seal

3 Covering cap

4 Heating flow connection

(diameter 1 1/4") to the

building

5 Heating return connection

(diameter 1 1/4") to the

heat pump

6 Connection hose in the

heating return to the heat

pump (on-site)

7 Insulation (on-site)

5. Remove the covering caps (3) from the product's hy-

draulic connections.

6. Install a dirt filter in the heating circuit return between

two stop valves so that the filter can be cleaned regu-

larly.

7. Install a flexible connection pipe (1) and (6) (to be

provided on-site) with an O-ring and a stop valve to

each of the connections for the heat pump heating flow

and return.

8. Check the connections for tightness.

5.3.2 Installing system diagram 8, variant E

1. Install the system in accordance with system diagram 8,

variant E (→ Page 30).

Note

In this system, the circulation pump of the

heat pump functions as a heating pump. It

is also in operation when only the boiler is in

operation.

2. On start-up, set system diagram 8 on the controller.

3. In order to guarantee operation with two heat generat-

ors, install the flow temperature sensor.

4. Connect the eBUS-compatible boiler using a bus

coupler on the eBUS line.

5.3.3 Installing system diagram 8, variant F

1. Install the system in accordance with system diagram 8,

variant F (→ Page 30).

2. On start-up, set system diagram 8 on the controller.

3. In order to guarantee a minimum circulation water

volume, install a differential-pressure bypass valve.

4. In order to guarantee the product's underfloor protective

circuit, install a limit thermostat.

5. In order to guarantee the hot water generation using the

heat pump, install a cylinder sensor and a 3-way valve.

5.3.4 Installing system diagram 10, variant B

1. Install the system in accordance with system diagram

10, variant B (→ Page 30).

2. On start-up, set system diagram 10 on the controller.

3. In order to guarantee a minimum circulation water

volume, install a differential-pressure bypass valve.

4. In order to guarantee that the unit can be operated with

an auxiliary heating module, install the flow temperature

sensor.

5. In order to guarantee the hot water generation using the

heat pump, install a cylinder temperature sensor and a

3-way valve.

6. In order to guarantee the product's underfloor protective

circuit, install a limit thermostat.

7. Install an auxiliary electric heater on-site.

8. Set the hot water temperature for the pre-heating stage

on the system controller and the desired hot water tem-

perature on the on-site auxiliary heater.

5.3.5 Installing system diagram 12, variant A

1. Install the system in accordance with system diagram

12, variant A (→ Page 30).

2. On start-up, set system diagram 12 on the controller.

3. Connect the area valves.

4. In order to guarantee a minimum circulation water

volume, install a differential-pressure bypass valve.

5. In order to guarantee the product's underfloor protective

circuit, install a limit thermostat.

6. In order to guarantee that the unit can be operated with

an auxiliary heating module, install the flow temperature

sensor.

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