17 6.1d On-Off Series 1500, 1700, 2000 ..... 19 6.1e On-Off IRI Series 1500, 1700, 2000 21 6.2 Auxiliary Control Panel...................... 23 6.2.1 On-Off Auxiliary Control Panel .... 23 Improper use may result in fire or injury. Read instructions/safety manual before installing, operating or servicing boiler. ! WARNING c 1998 HCS, Inc. 800-748-0241 Reorder No. 6020-V2WHPK WARNING! It is essential to read, understand, and follow the recommendations of this manual before installing, operating,

Box 458, East Stroudsburg, PA 18301 Telephone: (877) 728-5351, Facsimile: (570) 476-7247 Modu-Fire® Gas-Fired Boiler Table of Contents 1.0 INTRODUCTION........................................1 2.0 SAFETY......................................................1 2.1 General ....................................................... 1 2.2 Training.......................................................1 2.3 Safety Features .......................................... 1 2.4 Safety Labels ...................

2 3.0 SAFETY ...................................................... 2 3.1 General................................................... 2 3.2 Training................................................... 2 3.3 Safety Features....................................... 3 3.4 SafetyLabels.......................................... 3 3.5 Safety Precautions ..................................3 3.5.1 Electrical Hazards ......................................3 3.5.2 Burn, Fire, and Explosion Hazards.............3