Owner`s manual

ManualsBrandsSchwank ManualsFurnaceSET - SETU

SET(U)-F / ITT(U)-F Manual

IM091221

RD: FEB 2014

RL: 8B

Improper adjustment, alteration, service or maintenance can

cause property damage, injury or death. This heater must be

SEQUENCE OF EVENTS (also see DSI Troubleshooting previous page)

22. TROUBLESHOOTING GUIDE - HEATER OPERATION

WARNING

SET THERMOSTAT TO CALL FOR HEAT

APPLY 120 VOLTS

 CHECK 120V TO DSI AT “L1”

 CHECK 120V OUT AT “IND” FROM DSI TO BLOWER

COMBUSTION AIR BLOWER STARTS

AIR PROVING SWITCH HAS CLOSED 24

VOLTS IS PRESENT AT “PSW” AT DSI

CONTROL.

 CHECK TUBING TO SWITCH IS CONNECTED AND

NOT BLOCKED OR KINKED

 CHECK AIR PRESSURE WITH MANOMETER

 CHECK FOR OBSTRUCTION IN THE AIR INTAKE

 REPLACE DEFECTIVE BLOWER

 CHECK INTEGRITY OF SWITCH

 REPLACE DEFECTIVE SWITCH

 CHECK DSI CONTROL FUSE FOR CONTINUITY

 VISIBLY CHECK IF IGNITER IS SHORTING OUT

 CHECK GROUND WIRING

 REMOVE AND INSPECT IGNITER AND LEAD

 CHECK BOOT OF THE IGNITION CABLE FOR SIGNS

OF MELTING OR OVERHEATING

 IF “YES” ... TAKE PROTECTIVE ACTION TO SHIELD

CABLE AND BOOT FROM EXCESSIVE TEMPERA-

TURE; REPLACE ANY DEFECTIVE COMPONENT

 CHECK CERAMIC INSULATOR AND CAP

 CHECK SPARK GAP SETTING IS 3/16” (ADJUST BY

MOVING THE GROUND PRONG ONLY

)

 PERFORM IGNITION LEAD TEST (See SPARK IGNI-

TION CIRCUIT INSTRUCTIONS—Section 22)

 GOOD SPARK.....REPLACE IGNITER

 NO SPARK/OR WEAK.....REPLACE CONTROL

SPARK IGNITER / SENSOR

24V TO GAS VALVE

CONTINUED

YES

 REMEDY 120 VOLTS SUPPLY FAULT

 FAULTY RELAY SWITCH IN DSI — REPLACE DSI

BLOCKED FLUE SWITCH IS CLOSED

24 VOLTS IS PRESENT AT “TH” AT DSI