Installing The Heating And Domestic Hot Water Circuit; Installing The Electrical Connections - Vaillant aroTHERM VWL Series Manual

Work step
10 Outdoor unit
► Evacuating the refrigerant circuit
11 Outdoor unit
► Adding additional refrigerant
12 Outdoor unit
► Releasing the refrigerant
4.4

Installing the heating and domestic hot water circuit

→ uniTOWER installation and maintenance instructions, from section 5.1 onwards
→ Accessory set-up instructions
Work step
13 Indoor unit
► Installing the domestic hot and cold water
connection
► Installing heating circuit connections
14 Heating circuit
► Connecting the buffer cylinder
► Connecting the bypass valve
15 Heating circuit
► Connecting the additional expansion vessel
16 DHW circuit
► Connecting the expansion vessel
17 DHW circuit
► Connecting a circulation pump
18 Safety devices
► Installing the safety devices
4.5

Installing the electrical connections

→ aroTHERM installation and maintenance instructions, from section 6.1 onwards
→ uniTOWER installation and maintenance instructions, from section 6.1 onwards
→ multiMATIC installation instructions, from section 4.1 onwards
→ Accessory set-up instructions
Work step
19 System control
► Connecting the system control
20 Outdoor temperature sensor
► Connecting the outdoor temperature sensor
21 Outdoor unit
► Establishing the power supply
0020243831_00 System assistant
System with system control (0020232127) 4
Selected information/measures
► Drain the nitrogen that was poured in.
► Connect a vacuum pump.
► Drain the refrigerant circuit in two rounds of 30 minutes each.
► After each round, check whether the pressure is stable:
–
0.1 kPa (1.0 mbar) absolute pressure
Condition: Basic length of the refrigerant pipe > 15 m
► For each additional metre (above 15 m), add additional refrigerant:
–
30 g/m for an output of up to 5 kW
–
70 g/m for an output of 7 kW or higher
► Turn the isolation valves as far as they will go.
Selected information/measures
► Observe the connection symbols.
→ uniTOWER installation and maintenance instructions, section 3.7
Condition: The dimension of the installed expansion vessel is not sufficient
► Ensure that there is sufficient dimensioning.
► If required, adjust the pre-charge pressure.
► Ensure that all of the required safety device have been installed in the sys-
tem.
Selected information/measures
► Ideally, install the system control in a living room.
Conditions: Installation in the indoor unit's electronics box
► Install a separate humidity sensor.
► Select a correct cable cross-section.
► Comply with the connection conditions for the energy supply company.
► Determine whether an electrical connection 1~/230 V or 3~/400 V (→ data
plate) is required.
► Determine whether the power supply should be set up using a single-tariff
meter or a dual-tariff meter.
Condition: Depending on the installation site
► Install one or two type-B residual-current circuit breakers for the outdoor unit,
depending on the connection type.
15