Notes On Connecting To The Mains Supply; Vitovalor Pt2 In Mains Parallel Mode; Metering Generated Power - Viessmann Vitovalor PT2 Installation And Service Instructions For Contractors

Preparing for installation
4. Prepare electrical connections: See following chap-
ter.
The appliance is delivered fitted with a power cable
(approx. 2 m long).
!
Please note
Switching off by means of an emergency
stop switch for the heating system can dam-
age the appliance.
Remove any emergency stop switches from
the existing heating system.
Accessory cables: Flexible cables with required
number of cores for external connections

Notes on connecting to the mains supply

Vitovalor PT2 in mains parallel mode

During operation of the Vitovalor PT2, any generated
power is fed into the building distribution system and/or
exported to the grid. This operating mode is described
as mains parallel mode. For this, the Vitovalor PT2 is
mechanically coupled to the grid.
Separate guidelines and regulations apply to this mode
of operation which must be taken into account when
making the electrical connection to the mains:
■ TAR medium voltage VDE-AR-N-4110
■ Current technical connection conditions for connec-
tions to the LV grid. These connection conditions
must be obtained from the relevant power supply util-
ity.
■ The applicable DIN VDE guidelines, specifically
DIN VDE 0100, Part 701, DIN VDE 0100-551,
DIN VDE 0126-1-1 and DIN VDE AR-N 4105
Connect the power supply (230 V/50 Hz) via a per-
■
manent connection.

Metering generated power

A net AC meter (Z2) is integrated into the
Vitovalor PT2. This meter captures total electrical
power generated, minus that consumed by the
Vitovalor PT2 itself. This meter is MID-calibrated and is
licensed for statements to DIN VDE AR-N 4105 and
the German CHP Act (KWKG).
The calibration of the integral meter is valid for 8 years.
After expiry of this time, the meter must be recalibrated
or be replaced by a qualified contractor. The power
supply utility must also be notified of any new meter.
(cont.)
■
■
■
Notify the local grid operator before commissioning the
Vitovalor PT2. We recommend you contact the local
grid operator prior to installation and clarify any techni-
cal points as well as the acceptance procedure. Hand
the relevant application forms as per VDE AR-N 4105
[or local regulations] to the relevant grid operator.
Application forms [for German grid operators] are
available at www.viessmann.de.
Note
Different documentation may be required by grid oper-
ators in other regions.
Replace any existing main electricity meter installed in
the LV distribution board (meter cupboard) with a bal-
ancing bidirectional meter if excess power is exported
to the grid [check local regulations]. The change of
meter with all necessary formalities must be under-
taken by an authorised electrician in agreement with
the grid operator.
Preparing for installation
Regulations on safety at work and those of appropri-
ate trade associations
LV connection ordinances as well as supplementary
conditions of the relevant grid operator
Any applicable statutory or local regulations
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