Burner Control Programming Unit; Gas Valve - Viessmann Vitocrossal 200 CM2 500 Service Instructions Manual

Burner Service

Burner Control Programming Unit

Gas Valve

1. Remove the screw and disconnect the electrical plug
(black) from the gas valve.
2. Remove the screw and disconnect the electrical plug
from the gas pressure switch.
3. Remove the screw and disconnect the electrical plug
(white) from the gas pressure switch.
4. Disconnect gas supply line.
5. Remove the four M5 (4 mm hex key) bolts from the
lower gas valve flange and set aside.
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).
38
Vitocrossal 200, CM2 400, 500 and 620 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.
10. Reinstall in reverse order.
Note: Torque the M5 (4 mm hex) bolts to 13 lb.in
(15 Nm).
Note: The burner for the CM2 500 requires a gas
orifice (see the installation instructions).
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.