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A. INTRODUCTION
The Hot Surface Ignition (HSI) System operates at 24 VAC and is a discrete component based
gas ignition control (HSI module) system which utilizes a Hot Surface Ignitor as an ignition
source. Safe proof of flame is accomplished through flame rectification.
The HSI module has a diagnostic LED (light emitting diode) indicating light which simplifies
troubleshooting in the event of a fault.
Other Features...
• 24 VAC microprocessor based HSI control
• System diagnostic L.E.D. (light emitting diode)
• Automatic reset one (1) hour after lockout
• Multiple tries
• Custom pre-purge and inter-purge timing
• Remote and local sensing
• Flame sense test pins
• Software conforms to UL 1998 requirements
• Design certified to ANSI Z21.20 and CAN/CSA C22.2 No. 199-M89
B. GENERAL SYSTEM INFORMATION
1. HOT SURFACE IGNITION (HSI) SYSTEM COMPONENTS/FUNCTIONS:
a. The HSI MODULE is designed to be the controller of the HSI system. When activated
by the dryers controls, this module constantly monitors and controls the functions of the
1) Failure To Light - LOCKOUT
a) Should the main burner fail to light, or if a flame is not detected during the first
trial for ignition period, the gas valve is de-energized and the HSI module goes
through an inter-purge delay before another ignition attempt. The control will
attempt two (2) additional ignition trials before going into LOCKOUT and the gas
valve will be de-energized immediately.
Hot Surface Ignition (HSI) Module
HSI system (i.e., ignitor activation, gas
valve on/off functions, flame verification,
etc.), can be operated at either 50 Hz or
60 Hz; and has self diagnostic capabilities.
The L.E.D. (indicator light) on the HSI
module simplifies the troubleshooting
procedure in the event of a fault within the
HSI system. If the LED on the HSI module
does not blink constantly, then the system
is functioning properly. A red L.E.D.
(LOCKOUT MODE) indicates that ignition
flame has not been confirmed. Refer to the
TROUBLESHOOTING SECTION of this
manual for specific diagnostic information.