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