Making The Safety Connection And Checking Tightness - Viessmann Vitoradial 300-T Installation Instructions Manual

Making the safety connection and checking tightness

Installation instructions, safety equipment block
Install the safety lines.
Safety connection for
101 to 201 kW
263 and 335 kW
Permiss. operating
pressure
Test pressure
Low water indicator
According to EN 12828, a special low
water indicator can be omitted for boilers
up to 300 kW (except for attic heating
centres), as the standard boiler control
unit prevents heating when not permit-
ted.
Therm-Control start-up system
A shunt pump for raising the return tem-
perature is generally not required.
Ensure during the start-up phase (e.g.
during commissioning, after night and/or
weekend shutdowns), that the heating
circuit flow rate is reduced via the heat-
ing circuit control or via heating circuit
pumps (speed stages) to a max. of 50 %
(for multi-boiler systems max. 50 % of
the smallest boiler).
The heating circuit control or the heating
circuit pumps are regulated via the per-
manently (factory-)set Therm-Control
temperature sensor.
For further details regarding the Therm-
Control start-up control, see the relevant
technical guide.
For installation, see separate installation
instructions.
Note
Equip boilers with a safety valve which is
type-tested according to TRD 721 [or
R 1¼ local regulations] and which must be
R 1½ marked in accordance with the relevant
system version.
4 bar Install all pipe connections free of load
and torque stresses.
5.2 bar
!
Please note
Unsuitable water quality can
damage the boiler body.
Only fill the boiler with water that
complies with the "Water quality
requirements" (see service
instructions and VDI Directive
2035).
7