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Water Heater
A.O. Smith
120 trough 500
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BTR TANK TYPE HEATERS
SERVICE HANDBOOK
A.O. Smith Water Products
Service Handbook
Irving, Texas ©2000
Training Department
17
BTR
ELECTRICAL SEQUENCE
100 – 109 Series
Contents
Main
BTR TANK TYPE HEATERS SERVICE HANDBOOK
1
Page
Page
EXTERIOR CLEARANCE
+
Page
Page
Page
INSUFFICIENT MAKE-UP AIR
Page
Page
BTR GAS VALVE
VENTING Atmospheric Multiple Heaters
DRAFT INDUCER
POWER VENT KITS FOR SIDEWALL VENTING
BTR SEQUENCE OF OPERATION
Page
BTR TANK TYPE HEATERS SERVICE HANDBOOK
18
BTR ELECTRICAL SEQUENCE OF OPERATION
TROUBLESHOOTING BTR WATER HEATERS
STEP 1 TEST THE TRANSFORMER
STEP 2 HIGH LIMIT, LEFT TERMINAL TEST
STEP 3 TEST HIGH LIMIT RIGHT TERMINAL
Page
STEP 6 PC BOARD MOTOR TEST
Service Switch
Motor Lead Terminals
STEP 7 THERMOSTAT TEST
STEP 8 DAMPER INPUT TEST
STEP 9 TEST THE DAMPER
STEP 10 TEST DAMPER OUTPUT
EFFIKAL DAMPER
Page
Page
Page
TROUBLESHOOTING THE EFFIKAL STYLE DAMPER (continued)
STEP A3 TEST FOR 24VAC BETWEEN BLACK AND YELLOW
STEP 11 WIRE HARNESS TEST
STEP 12 IID MODULE TEST
STEP 13 PILOT SPARK TEST
STEP 14A PILOT VALVE - OHM TEST
STEP 14B PILOT VALVE TEST BTR 500 ONLY
STEP 15 MAIN BURNER TEST
STEP 16 FLAME RECTIFICATION
STEP 17 IID MODULE TEST
STEP 18A MAIN GAS VALVE CHECK
TH
TR
STEP 18B MAIN GAS VALVE COIL CHECK
BTR WIRING DIAGRAM - NATURAL AND PROPANE GAS
GENERAL SERVICE CHART
GENERAL QUESTIONS AND ANSWERS
Page
Page
PARTS LIST for BTR Models 197 and 198 Series 100 & 101
Item Parts Description BTR 197 BTR 198
Page
Page
PARTS LIST FOR BTR Models 120 Through 500(A) Series 104 Through 109 Series
Item Parts Description BTR-120 BTR-154 BTR-180 BTR-199 BTR-200 BTR-250
Item Parts Description BTR-251 BTR-275 BTR-305 BTR-365 BTR-400 BTR-500
COMPONENT PART INFORMATION
BTR SERVICE CHECKLIST
