Control Panel; Mounting Of Control Panel; Electrical Connection; General Safety Instructions - Viessmann Vitoflex 300-UF Series Installation And Operating Instructions Manual

Electrical

Control Panel

Mounting of the control panel
A certified electrician shall mount the control panel.
Optimum positioning of the control panel will minimize
the time and costs of the installation.
The control panel should be in an area where the heat
radiation (front side of boiler, rear side of boiler with
flue gas cyclone and flue gas exhaust blower as well as
recirculation line) and the exposure to dust during cleaning
is at a minimum.
The ambient temperature for the control panel approx.
4 in. (100 mm) away from the control cabinet) should not
exceed 104°F (40°C) while the system is in operation.
The minimum temperature must not be less than 50°F
(10°C) In case of doubt, preference should be given to
placing the control panel outside the mechanical room
near the heating room door.

Electrical connection

- Install the control panel according to the field wiring
diagram. The field wiring diagram is supplied with the
control panel.
- In the area of hot parts (flue gas exhaust blower, flue
gas pipe), the lines should be installed in steel pipes at
an appropriate distance so as to be protected from
excessive temperatures. See section Boiler Wiring.
- The cable bushings to the motors and equipment must
be dust-tight and provided with a strain relief.
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Vitoflex 300-UF Installation & Operating

General safety instructions

- Retighten all wire holding screws inside the control
panel before start-up.
- Provide fusible disconnect means according to local
code.
- DHW safety aquastat is to be installed in the tank well.
The aquastat can be installed on the DHW building supply
line if a recirculating DHW pump is used. Please check the
local building code. The DHW safety aquastat does NOT
replace scald protection devices required by local code.
CAUTION
The Viessmann supplied field wiring diagram is not a
complete system drawing. It is the installer's responsibility
to assure that the control is suitable for the respective
installation, and all necessary safety equipment is installed.
CAUTION
The information about wire type, wire number and wire
gauge made in the wiring diagrams is not obligatory.
The final decision of these settings has to be made by
the executing installation company taking into consideration
the local codes and regulations.
CAUTION
Any alteration of the control cabinet will void the warranty.