Lochinvar CG200 User Manual

25

Description of this flow chart can be found in the “SEQUENCE OF OPERATION” section found on page 18.

Switch power on

to unit.

Thermostat calls

for heat.

Ignition Control

Board performs

diagnostic check on

components

Ignition Control

Board sends power

to Exhaust Inducer

Exhaust Inducer

engages Prover

Switch

Ignition Control

Board provides

power to Silicon

Nitride Ignitor

Silicon Nitride

Ignitor

warms up for

20 seconds

Ignition

Control Board

opens Gas

Valve.

Ignition Control 

Board shuts off

Silicon Nitride

Ignitor after

3 seconds

Ignition Control

Board waits 3 more 

seconds to 

monitor Flame

Sensor.

Did Main 

Burner Light?

Ignition Control

Board monitors

units until T’Stat

is satisfied. 

Ignition Control

Board shuts off Gas

Valve and allows the 

Exhaust Inducer to 

purge appliance for 

20 seconds.