Commissioning, Inspection And Maintenance; Steps - Commissioning, Inspection And Maintenance; Select The Gas Type; Commissioning The System - Viessmann Vitocrossal 200 CM2 500 Service Instructions Manual

Commissioning, Inspection, 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. Permissible gas
pressure 4-14 "w.c.
3. Open the gas line shut-off valves.
4. Switch ON the main power (breakers).
5. Switch ON system ON/OFF switch at the control unit.
If fault indicator on the control unit illuminates and
burner control unit display A flashes, first press
reset button R B on the burner control unit.
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). Purge 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.
12
Vitocrossal 200, CM2 400, 500 and 620 Service
6. Match the coding card at the burner control unit
according to the chart on this page. Also refer to
page 55.
See the control section of the Installation
Instructions and neutralizing system Operating
Instructions.
7. Check the function of the neutralizing system.
Note: 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 initial run (see page 21).
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"
on page 71.
The Vitocrossal 200 CM2 boiler is for use with gases
whose characteristics fall within the following ranges.
Other types of gas such as LPG 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 400
Model 500
Model 620
Liquid Propane Gas
2466 to 2542
1.522 to 1.574
13.73 to 13.82
Part No.
7842314
7842315
7842316