Amana GUIA Series Service Instructions Manual page 98

SYSTEM OPERATION
HEATING TIMING CHARTS FOR WHITE-RODGERS 50A51-235
TWO-STAGE INTEGRATED IGNITION CONTROL OPERATION
High
Air
Low
Circulator
Off
Blower
On
Gas Valve
Off
On
Igniter
Off
PS2 Closed
PS1 Closed
Pressure
Open
Switches
High
Induced Draft
Low
Blower
Off
High
Thermostat
Low
Off
High
Air
Low
Circulator
Off
Blower
High
Low
Gas Valve
Off
On
Igniter
Off
PS2 Closed
PS1 Closed
Pressure
Open
Switches
High
Low
Induced Draft
Off
Blower
High
Low
Thermostat
Off
98
Rev. 1
Example 3: Initial Call For Low Heat, Change In Call To High Heat
0 10 27 28
Example 4: Initial Call For High Heat, Subsequent Call To Low Heat
0 10 27 28
Call Change to High Heat
31 61 91
Time (sec)
Call Change to Low Heat
30 Seconds After Call Change to Low Heat
31 61 91
Time (sec)
0 15 30
0 15 30
60, 90 90, 120,
120, or 150, or
180 210
60, 90 90, 120,
120, or 150, or
180 210