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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,