33
33
0 10 30 33 34 64 94 0 15 30 60, 90 90, 120,
120, or 150, or
180 210
Circulator
Blower
Gas Valve
Igniter
Pressure
Switches
Induced Draft
Blower
Thermostat
High
Low
Off
On
Off
On
Off
PS2 Closed
PS1 Closed
Open
High
Low
Off
High
Low
Off
Timing Charts For Normal Heating Operation
Example 1: Continuous Call For Low Stage Heat Only
0 10 30 33 34 64 94 0 15 30 60, 90 90, 120,
120, or 150, or
180 210
Circulator
Blower
Gas Valve
Igniter
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
Time (sec)
Time (sec)
(Call for Heat)
4-second
maximum trial
for ignition
period
{
(Call for Heat)
4-second
maximum trial
for ignition
period
{
