Amana GUIA Series Service Instructions Manual page 96

SYSTEM OPERATION
HEATING TIMING CHARTS FOR WHITE-RODGERS 50A51-225
TWO-STAGE INTEGRATED IGNITION CONTROL OPERATION
Air
High
Circulator
Low
Blower
Off
Gas Valve On
Off
Ignitor On
Off
PS2 Closed
Pressure
PS1 Closed
Switches
Open
Induced High
Draft Low
Blower Off
High
Thermostat
Low
Off
Example 4: Initial Call For High Heat, Subsequent Call To Low Heat
Air
High
Circulator
Low
Blower
Off
High
Gas Valve
Low
Off
Ignitor On
Off
PS2 Closed
Pressure
PS1 Closed
Switches
Open
Induced
High
Draft
Low
Blower Off
High
Thermostat Low
Off
96
Rev. 1
Example 3: Initial Call For Low Heat, Change In Call To High Heat
0 10 27 31
0 10 27 31
Call Change to High Heat
34 64 94
Call Change to Low Heat
30 Seconds After Call Change to Low Heat
34 64 94
0 5 30
0 5 30
60, 90 90, 120,
120, or 150, or
180 210
60, 90 90, 120,
120, or 150, or
180 210