Irving, Texas Printed in the U.S.A. 596 4575 Series 226-227 Part No. TC-034 FPS/FPSE/FPD TECHNICAL TRAINING AND SERVICE WORKBOOK WORKBOOK INTRODUCTION Purpose The information contained in this workbook is designed to answer situations commonly encountered in the operation of the POWER SHOT and SEALED SHOT Product and is not meant to be all inclusive. If you are experiencing a problem not covered in this workbook, please contact the A.O. Smith Technical Information Department at (800)527-1

Turn the switch on the blower off when inserting the jumper wire. Then turn the switch back on. Use extreme caution as you may be working with 120 VAC. ©1995 A.O. Smith Technical Information Water Products Co. 24 Irving, Texas FPS/FPSE/FPD TECHNICAL TRAINING AND SERVICE WORKBOOK FPS 40 and 50 SERVICE AND OPERATION cont Troubleshooting cont PRELIMINARY THERMOSTAT TEST SET UP THE TEST - Place top Knob on gas valve to "OFF" position, - remove pressure tap set screw from bottom of gas valv

Then turn the switch back on. Use extreme caution as you may be working with 120 VAC. ©1995 A.O. Smith Technical Information Water Products Co. 51 Irving, Texas FPS/FPSE/FPD TECHNICAL TRAINING AND SERVICE WORKBOOK Troubleshooting cont BLOWER RUNS CONSTANTLY (No call for heat) cont. BLOWER TEST SET UP THE TEST - Disconnect the 4 wire cab e from the blower contro box as shown RESULTS If: then: the blower continues to run, replace the blower. the blower stops, go to Step 2. FPSE 40 an

Smith Technical Information Water Products Co. 78 Irving, Texas FPS/FPSE/FPD TECHNICAL TRAINING AND SERVICE WORKBOOK FPS 75 SERVICE AND OPERATION cont. Trouble- shooting cont BLOWER RUNS CONSTANTLY (CALLING FOR HEAT, NO PILOT) First make the Preliminary Checks (see page 71) then perform each of the following tests until cause of the failure is determined: 1. Air Pressure Switch Test 2. Vent High Limit Test 3. Blower Test 4. Cable Test 5. High Limit Test 6. TH Wire Test 7. PV - MV

The relief valve is set to open at 30 psi. If the valve is replaced, the replacement must have a relief capacity in excess of the DOE heating capacity for the boiler. Pipe the discharge of the relief valve to a location where water or steam will not create a hazard or cause property damage if the valve opens. The end of the discharge pipe must terminate in an unthreaded pipe. If the relief valve discharge is not piped to a drain, it must terminate at least 6 inches above the floor. Do not run re

No duplication or reproduction of this book may be made without the express written authorization of the A.O. Smith Water Products Company. The following text and illustrations will provide you with a step by step procedure to verify proper installation, operation, and troubleshooting procedures. Additional quick reference data is included to assist you in servicing this product. The information contained in this handbook is designed to answer common questions encountered in the operation of the

3. Disconnect the electric connection by unplugging the transformer from the wall outlet (Figure 58). 4. Remove the manifold cover/ outer door from the unit by depressing on the lower portion and pulling outward. 5. Unplug the 3-wire pressure switch/fan/sensor electrical connection of the wiring harness from the gas control valve/thermostat by depressing the lower portion of the snap clip to open and pulling down the connector (Figure 59). 6. Unplug the electric flag terminals and air pressure t

B. If the reading taken is less than 1.7 million ohms, and the wiring from the control to the sensor is good, replace the lower control. 12. “FV-SENSE” and “SHORT” Flashing Flammable Vapor Sensor is shorted 1. Check all wiring to the flammable vapor sensor. 2. Remove the connectors from the flammable vapor sensor and measure the resistance of the sensor with an ohmmeter. A. If the reading taken is less than 2000 ohms, replace the flammable vapor sensor. B. If the reading taken is more than 2000