Control Timings - Bradford White M1TW40S Series Service Manual

Control Timings

Ignition State
Pre-purge
Trial for Ignition
Flame Stabilization Period
Inter-purge
Flame Failure Response Time
Post-purge
PS Fault Delay (failed open/close)
Soft Lockout
TCO Limit Lockout
Verify Resistive Delay
Simulated Resistive Load Lockout
Hardware Error Lockout
2 Seconds
90 Seconds
3 Seconds
15 Seconds
1.5 Seconds (2 second. Maximum; 1 second minimum.)
15 Seconds
Retry after 2 Minutes
Retry after 5 Minutes
Indefinite (See Page 24 to reset)
Retry after 2 Minutes (repeats 5 times)
Indefinite (cycle power to reset)
Indefinite (self clears if fault clears for at least 15 seconds)
Wiring Diagram
Wiring Diagram
Blower Blower
Temperature Temperature
Switch
Switch
Pressure
Pressure
Switch
Switch
Blower
Blower
Housing
Housing
Pilot
Pilot
C
B
C
B
A
A
Simulated
Flammable
Resistive
Vapor
Device
Sensor
Thermal
Thermal
Well
Well
Specifications
Timing
Blower Blower
Motor
Motor
Page 9
Page 9
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