Product Information; Shut Down Heating System; Check Pressure Relief Rating - Viessmann VITOCROSSAL 300 Service Instructions Manual

General Information

Product Information

High efficiency gas-fired hot water condensing boiler.
For operation with modulating boiler water temperatures
in closed loop, forced circulation hot water heating
systems.
The Vitocrossal 300, CT3 boilers are CSA certified with
Weishaupt and Riello burners which must be used in
conjunction with this boiler series.
The proper burner size must be verified and the burner
must be adjusted so that the maximum input of the
appropriate boiler size is always observed and adjusted.
The gas burner must always be installed according to the
instructions provided by the burner manufacturer.
The boiler model selected should be based on an accurate
heat loss calculation of the building. The boiler selected
must be compatible with the connected radiation.
The Vitocrossal 300 boiler is suitable for a maximum
operating pressure of 30 psig and a maximum boiler water
temperature of 210°F (99°C).
The maximum hydrostatic test pressure is 45 psig.

Shut Down Heating System

Check Pressure Relief Rating

10
Vitocrossal 300, CT3 Series Service
WARNING
Exposing the boiler to pressures and temperatures in
excess of those listed will result in damages, and will
render warranty null and void.
See Installation and Operating Instructions
for Vitotronic controls.
The Vitocrossal 300 boiler series is operated with
a Vitotronic control and microcomputer indoor/
outdoor control system for boiler operation without
low temperature limit. The control system must be
programmed for this type of operation.
This boiler does not require a flow switch.
This boiler is for natural gas or propane gas only.
1. Deactivate main power supply to heating system and
secure against accidental reactivation.
WARNING
There may be more than one electrical disconnect.
2. Disconnect fA plug from burner (where applicable).
3. Close main gas supply valve.
The maximum allowable working pressure is 30 psig.