Burner Control Programming Unit; Gas Valve (Ng) - Viessmann Vitocrossal 200 CM2 186 Service Instruction

Burner Service

Burner Control Programming Unit

Gas Valve (for NG)
32
Vitocrossal 200 CM2 186 to 311 Service
1. Loosen the two programming unit screws.
2. Lift the programming unit off the burner control
sub-base and disconnect the cable plug and replace.
3. Reinstall in reverse order.
1. Remove the screw and disconnect the electrical plug
(black) from the gas valve.
2. Remove the screw and disconnect the electrical plug
(white marked GDW2) from the gas pressure switch.
3. Remove the screw and disconnect the electrical plug
(white) from the gas pressure switch.
4. Remove the four M5 (4 mm hex key) screws from the
lower gas valve flange and set aside.
5. Disconnect gas supply line.
6. Disconnect compensation tubing from gas valve.
7. Remove tube support from gas valve and set aside.
8. Remove four M5 (8 mm hex) nuts from the gas
manifold and set aside.
Note: Clean surface area of manifold and replace O-ring.
9. Replace gas valve.
Note: Install M5 studs to the gas valve to reconnect
the manifold and torque to 17 lb.in (2 Nm).
10. Reinstall in reverse order.
Note: Torque the M5 (4 mm hex) screws to 132 lb.in
(15 Nm).
Note: Torque the M5 (8 mm hex) nuts to 17 lb.in
(2 Nm).
WARNING
Gas leakage may lead to explosion. Leak test the
reconnected gas line and gas valve connections.
CAUTION
Usage of leak detection spray may lead to malfunction.
Avoid contact between leak detection spray and
electric contacts.