18
0 10 27 31 34 64 0 5 30 60, 90
120, or 180
Air
Circulator
Blower
Gas Valve
Ignitor
Pressure
Switches
Induced Draft
Blower
Thermostat
High
Low
Off
On
Off
On
Off
PS2 Closed
PS1 Closed
Open
High
Low
Off
High
Low
Off
0 10 27 31 34 64 0 5 30 60, 90
120, or 180
Air
Circulator
Blower
Gas Valve
Ignitor
Pressure
Switches
Induced Draft
Blower
Thermostat
High
Low
Off
High
Low
Off
On
Off
PS2 Closed
PS1 Closed
Open
High
Low
Off
High
Low
Off
Example 2: Continuous Call For High Stage Heat Only
Timing Charts For Two Stage Integrated Ignition Control Operation
Example 1: Continuous Call For Low Stage Heat Only