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2
2.
Install the flow (2) and return (1) for the heating circuit
connections correctly.
Connection symbols (→ Page 207)
5.9
Connecting additional components
You can install the following components:
Note
To guarantee that there are no ignition sources,
components that are not free from ignition
sources, such as SR 920 or SRC 720f/2, must
never be installed on the product.
–
Domestic hot water circulation pump
–
Buffer cylinder for the heating system
–
SR 920 communication unit
–
External current anode
–
8-litre domestic hot water expansion vessel (domestic hot
water does not flow through it)
–
Domestic hot water expansion vessel (domestic hot wa-
ter flows through it)
–
SRC 720 system control
6
Electrical installation
6.1
Preparing the electrical installation
Danger!
Risk of death from electric shock as a res-
ult of an improper electrical connection!
An improper electrical connection may neg-
atively affect the operational safety of the
product and result in material damage or per-
sonal injury.
▶
Only carry out the electrical installation if
you are a trained competent person and
are qualified for this work.
1.
Observe the technical connection conditions for con-
necting to the energy supply company's low-voltage
network.
2.
Use the data plate to determine whether the product
requires a 1~/230V or a 3~/400V electrical connection.
3.
The product is pre-configured at the factory for the
unblocked 1~/230V connection.
4.
Determine whether the power supply for the product
should be set up with a single-tariff meter or a dual-
tariff meter.
5.
Connect the product using a fixed connection and an
all-pole partition with a contact gap of at least 3 mm
8000017440_FT Installation and maintenance instructions
(e.g. fuses or power switches) with full switch-off se-
quence in accordance with overvoltage category III.
1
6.
Use the data plate to determine the product's rated
current. Derive the suitable cable cross-sections for
the electrical wires from this.
7.
In each case, take into consideration the (on-site) in-
stallation conditions.
8.
Ensure that the nominal voltage of the power grid cor-
responds to that of the product's main power supply
cabling.
9.
Make sure that access to the power supply is always
available and is not covered or blocked.
10.
Determine whether the energy supply company lockout
function has been provided for the product, and how
the power supply for the product should be designed,
depending on the type of shutdown.
11.
If the local power supply network operator requires the
heat pump to be controlled using a blocking signal,
install a corresponding contact switch as specified by
the power supply network operator.
12.
Note the connection load for all connected external
actuators (X11, X13, X14, X15, X17) of a max. total
of 2 A.
13.
If the line length exceeds 10 m, prepare the separated
routing of the power supply cable and Modbus cable.
6.2
Requirements for the quality of the mains
voltage
For the mains voltage of the single-phase 230 V network, a
tolerance of +10% to -15% must be provided.
For the mains voltage of the three-phase 400 V network, a
tolerance of +10% to -15% must be provided. For the voltage
difference between the individual phases, a tolerance of +-
2% must be provided.
Note
If you connect the outdoor unit and indoor unit
with 230 V together to one phase, ensure that a
short circuit performance ratio of R
exceeded.
6.3
Requirements for electrical components
Flexible hose lines must be used for the power supply. The
specification must comply with the standard 60245 IEC 57
with the abbreviation H05RN-F as a minimum.
The disconnectors must correspond to overvoltage category
III for full isolation.
For the electrical fuse protection, slow-blow fuses with C
characteristics must be used.
To protect people, type B universal-current-sensitive resid-
ual-current circuit breakers must be used if these are stipu-
lated for the installation site.
66 is not
sce
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