American Dryer ADG-530 User Manual

ADG-530

Hot Surface Ignition System

T echnical Manual

American Dryer Corporation

88 Currant Road

Fall River MA 02720-4781 USA

T elephone: [phone] / Fax: [phone]

e-mail: techsupport@amdry .com

www.amdry.com

ADC Part No. 450401- 3

Retain This Manual In A Safe Place For Future Reference

American Dryer Corporation products embody advanced concepts in engineering, design, and safety. If this

product is properly maintained, it will provide many years of safe, efficient, and trouble-free operation.

ONLY properly licensed technicians should service this equipment.

OBSERVE ALL SAFETY PRECAUTIONS displayed on the equipment or specified in the installation/operator's
manual included with the dryer.

THE HSI MODULE IS NOT FIELD REP AIRABLE

and

THE HSI GAS VAL VE IS NOT FIELD REP AIRABLE

We have tried to make this manual as complete as possible and hope you will find it useful. ADC reserves the
right to make changes from time to time, without notice or obligation, in prices, specifications, colors, and material,
and to change or discontinue models.

WARNING: UNDER NO CIRCUMSTANCES should the door switch or the heat circuit devices

ever be disabled.

WARNING: The dryer must never be operated with any of the back guards, outer tops, or

service panels removed. PERSONAL INJURY or FIRE COULD RESULT.

NOTE: The wiring diagram for the dryer is located on the right wall, inside the Left Coin Panel area.

Replacement parts can be obtained from your distributor or the ADC factory . When ordering replacement parts
from the factory, you can FAX your order to ADC at [phone] or telephone your orders directly to the
ADC Parts Department at [phone]. Please specify the dryer model number and serial number in
addition to the part number and part description, so that your order is processed accurately and promptly.

The illustrations on the following pages may not depict your particular dryer exactly. The illustrations are a
composite of the various dryer models. Be sure to check the descriptions of the parts thoroughly before ordering.

INSTRUCTIONS TO BE FOLLOWED IN THE EVENT THE USER

SMELLS GAS MUST BE POSTED IN A PROMINENT LOCATION. THE
INSTRUCTIONS TO BE POSTED SHALL BE OBTAINED FROM THE
LOCAL GAS SUPPLIER.

GAS “HOT SURF ACE IGNITION” (HSI) SYSTEM

MODEL TRITON 2465 (ADC Part No. 128974) 50/60 Hz TYPE ONL Y

PRODUCT INFORMATION and TROUBLESHOOTING GUIDE

NOTE: Failure to read and follow

ALL instructions and information included in this
manual carefully before operating and/or servicing this system, COULD
CAUSE PERSONAL INJURY and/or PROPERTY DAMAGE.

IMPORTANT: We have tried to make this manual as complete as possible and

hope you will find it useful. However, since the time of this
printing, some information contained herein may have been up­dated.

ADC RESERVES THE RIGHT TO MAKE CHANGES FROM TIME TO TIME,
WITHOUT NOTICE or OBLIGATION IN PRICES, SPECIFICATIONS, COLORS,
and MATERIALS, and TO CHANGE or DISCONTINUE MODELS or PARTS.

Table of Contents

A. INTRODUCTION ..........................................................................................................2

B. GENERAL SYSTEM INFORMA TION .......................................................................2

HSI System Components/Functions .........................................................................2

Failure T o Light - LOCKOUT .....................................................................2

Flame Failure Reignition ...............................................................................3

System (basic) Electrical Ratings/Specifications ........................................................5

C. HSI (Hot Surface Ignition) SYSTEM OPERA TION ....................................................5

HSI System Operation.............................................................................................5

HSI System Operation (Flow Chart) ........................................................................6

Normal Operation (summary) ..................................................................................7

D. TROUBLESHOOTING .................................................................................................7

T est Equipment ..................................................................................................................8

HSI Troubleshooting T erms (definitions) ...................................................................8

Troubleshooting/System Diagnosis (detailed) ............................................................9

E. P ARTS LIST (basic) ......................................................................................................14

1

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 dryer’s controls, this module constantly monitors and controls the functions of the
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.

Hot Surface Ignition (HSI) Module

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.

2

(1) Recovery from LOCKOUT requires a manual reset by either resetting the

thermostat or removing the 24 VAC from the HSI module for a period of five
(5) seconds.

(2) If the microprocessor (computer) is still calling for heat after one (1) hour, the

HSI module will automatically reset and attempt to ignite the burner again.

2) Flame Failure Reignition

a) If the established flame signal is lost while the burner is operating, the HSI module

will respond within 0.8 seconds. The gas valve is de-energized, the HSI module
resets and starts a new ignition sequence in an attempt to relight the burner. If the
burner does not light, the HSI module will de-energize the gas valve. The HSI
module will make two (2) more attempts to relight the burner. If the burner does
not relight, the HSI module will go into LOCKOUT. If flame is reestablished,
normal operation resumes.

IMPORTANT: The HSI MODULE is a precision instrument, and should be handled

carefully. ROUGH HANDLING or DISTORTING COMPONENTS
COULD CAUSE THE MODULE TO MALFUNCTION.

W ARNING: THE HSI MODULE IS NOT FIELD REPAIRABLE.

NOTE: To reset the HSI MODULE if it is in the LOCKOUT MODE, open and close the

main door then restart the dryer . If the module repeatedly goes into LOCKOUT ,
refer to the TROUBLESHOOTING SECTION of this manual.

b) The 24 VAC TRANSFORMER is designed to step down the operating (primary)

voltage of the dryer from 120 VAC, 208 VAC, or 240 VAC to the 24 VAC
(secondary voltage) which is necessary to operate the HSI system and in some
cases the controls of the dryer.

The 24 VAC TRANSFORMER has multi-primary taps which allow for one (1) transformer to
be used for any voltage application including...120 volt, 208 volt, or 240 volt. Refer to the
SERVICE INFORMATION SECTION of this manual for specific transformer/wiring
termination information.

24 VAC Transformer

3

c. The HOT SURFACE IGNITOR/FLAME SENSOR ASSEMBLY is located in the

burner flame area and is used to ignite the gas by the use of a HOT SURFACE
IGNITOR. To provide feedback information to the HSI module a FLAME SENSOR
is used to determine whether the burner flame is evident (on).

The HOT SURFACE IGNITOR is a silicon carbide ignitor that upon application of

24 VAC will glow bright orange for the inter-purge time period. The proper

location of the silicon carbide ignitor is very important to achieve optimum system

performance for both ignition and flame sensing.

After the inter-purge period the gas valve will open.

Upon ignition, the resistance in the flame sensor electrode changes and the in­formation is sent to the HSI module via the sensor probe lead connection to the
module. Once the resistance is changed and sensed, the HSI module will sustain
the gas flow (provide 24 VAC power to the gas valve).

Upshot Burner Tube

with Hot Surface Ignitor (HSI)/Flame Sensor Assembly

d . The HSI 24 VAC GAS VALVE(s) used are of the redundant type which means the

gas valve is actually two gas valves in one; one in series with the other. This is a
safety feature which provides protection against gas flow in the event of a failure of
one of the valves to seat properly. Other features are that the gas valves have a
manual shut off, a pressure tap outlet, and are designed for easy conversion to
regulated L.P. gas.

36E Redundant Gas Valve

WARNING: THE HSI GAS VALVES ARE NOT FIELD REPAIRABLE.

IMPORTANT: THERE ARE NO PARTS AVAILABLE FOR FIELD REPAIR. Replace

gas valve only with exact model and/or type number as noted on gas
valve.

4