Conversion To Liquid Propane Gas (Lpg) - Viessmann Vitocrossal 200 CM2 186 Service Instruction

Vitocrossal 200 CM2 186 to 311 Service
Steps – Commissioning, Inspection and Maintenance

Conversion to liquid propane gas (LPG)

(The LPG conversion kit is supplied with the burner)
1. Close the gas shut-off valve.
2. Switch OFF the system ON/OFF switch at the boiler
control unit.
3. Switch OFF the main boiler circuit breaker (outside
the boiler room) or the power supply and prevent
unauthorized reconnection.
4. Remove boiler front cover.
5. Undo gas supply fitting A
6. Disconnect compensation tubing B connected
between the venturi tube and the gas valve.
Commissioning, Inspection and Maintenance
(continued)
7. Remove four 8 mm hex nuts. Detach the gas valve
from flange C.
8. Remove and discard O-ring F from gas valve. Install
rubberized cork gasket E onto the gas valve face.
Install the LPG orifice D (with pin). Install second
rubberized cork gasket on top of the LPG orifice.
WARNING
Install LPG orifice with the pin at the top and to the rear.
Wrong installation of the orifice will lead to leakage.
9. Secure gas valve, orifice D and rubberized cork
gaskets E to the flange of the mixing system C.
Torque nuts diagonally with 17.7 lb.in (2.0 Nm).
10. Secure and tighten gas supply fitting A.
11. Reconnect the compensation tubing B (connected
between the venturi tube and the gas valve).
12.Apply:
- Partial rating plate above CSA rating plate located
on top panel (behind the boiler control).
- Label G indicating that this unit is equipped for NG
over the LPG label located on the gas valve.
- Label indicating that this unit has been converted from
LPG to NG next to the CSA rating plate (on the top panel).
- Fill out and fax conversion report.
13.Check all gas fittings for leaks.
WARNING
Escaping gas leads to a risk of explosion.
Check all fittings for gas leaks.
Note: The use of leak detecting spray can result in
incorrect functions. Leak detecting spray must
not come into contact with electrical components.
Gas orifice dimensions (liquid propane gas) for boiler
models 186 to 311
Boiler Model
186
246
311
Dimension a in. (mm)
0.38 (9.7)
0.48 (12.2)
0.54 (13.6)
Pin
11