Commissioning, Inspection And Maintenance; Steps - Commissioning, Inspection And Maintenance; Select The Gas Type; Commissioning The System - Viessmann Vitocrossal 200 CM2 186 Service Instruction

Commissioning, Inspection and Maintenance

Steps – Commissioning, Inspection and Maintenance

Commissioning the system

WARNING
Failure to ensure that all flue gases have been safely
vented to the outdoors can cause property damage,
severe personal injury, or loss of life. Flue gases may
contain deadly carbon monoxide.
See the control section of the Installation
Instructions and neutralizing system Operating
Instructions.
1. Check the heating system pressure. Permissible boiler
operating pressure: 75 psi.
2. Check the gas supply pressure.
3. Open the gas line shut-off valves.
4. Switch ON the main power (breakers).
5. Switch ON system ON/OFF switch B at the control
unit. If fault indicator A on the control unit illuminates
and burner control unit display C flashes, first press
reset button R D on the burner control unit.
Burner faults can also be acknowledged and reset at the
GW6B boiler control. Refer to the Vitotronic 300 GW6B
Installation and Service Instructions.
Note: The system can enter a fault state during
commissioning if there is insufficient gas in the
supply line (the fault indicator on the control unit
illuminates). Vent the gas supply line again and
reset the burner control unit.
Remove air from the gas line with an approved
gas purge burner or vent outdoors.
10
Vitocrossal 200 CM2 186 to 311 Service
6. Match the coding card at the burner control unit
according to the chart on this page. Also refer to
page 31.
See the control section of the Installation
Instructions and neutralizing system Operating
Instructions.
7. Check the function of the neutralizing system.
Note: Refer to neutralizing system operating instructions.
8. Check all gaskets and plugs, and retighten if necessary
Note: We recommend you check all connections on the
heating water side for leaks after approximately
500 hours run (see page 18).
9. Check the boiler door a few days after commissioning
and retighten all screws.

Select the gas type

1. The boiler is factory set to operate with natural gas.
See the following subsection for conversion instructions
to liquid propane gas.
2. Ensure that the fuel type listed on the boiler rating plate
is the correct type for the installation being attempted.
3. Record the gas type in the "Maintenance Record"
in this manual.
The Vitocrossal 200 CM2 boiler is for use with gases
whose characteristics fall within the following ranges.
Other types of gas such as LNG with different heating
value can be used.
Natural Gas
Heating value
(gross) Btu/ft 3 970 to 1100
Specific gravity 0.57 to 0.70
Ultimate carbon
dioxide (CO ) % 11.7 to 12.2
2
CM2 Burner Coding Card
Model 186
Model 246
Model 311
Liquid Propane Gas
2466 to 2542
1.522 to 1.574
13.73 to 13.82
Part No
7842311
7842312
7842313