Hsi System Operation (Flow Chart) - ADC ADG-530 Technical Manual

f. The Hot Surface Ignitor will turn on and after approximately four (4) seconds the Hot
Surface Ignitor will shut off. The Gas Valve will be energized and a burner flame should
be evident for approximately seven (7) seconds and then shut off.
g. The HSI Module will attempt two (2) additional ignition trials after which the HSI
Module will LOCKOUT and the "red" indicator light will flash 3 blinks, wait one (1)
second, and then keep flashing 3 blinks continuously until the HSI Module is reset
manually.
h. Functional check of the HSI (Hot Surface Ignition) Module is complete.

2. HSI SYSTEM OPERATION (Flow Chart)

Hot Surface Ignitor
Starts
To
Glow
Approx. 4 Seconds Later
Gas Valve Opens
Approx. 4 Seconds Later
Hot Surface Ignitor Shuts Off
Ignition Evident?
(FLAM E VERIFIED)
--------------------
YES NO
Normal Heating Cycle
HSI Module Enters
Internal Routine Check
L.E.D. Indicator
Stays On Approx. 4 Seconds
If L.E.D. Indicator
Stays On Continuously
Replace HSI Module
HSI Module Will Wait 15-17 Seconds
And Then Go Into Retry Mode
HSI Module Will Attempt To Retry Twice
Flame Out
FLAM E NOT VERIFIED
6
If L.E.D. Continuously
Blinks Twice in Succession
There Is a Fault In The
Heat Sensing Circuit
Open and Close Main Door
Restart Dryer
HSI Module LOCKOUT
--------------------------
Module L.E.D. Will Continuously
Blink 3 Times In Succession
HSI Module Will Wait 15-17 Seconds
And Then Go Into Retry Mode
HSI Module Will Attempt To Retry 3 Times
Computer
Calls
For Heat
------
Flame Not
Established
After Retrys