– Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. – WHAT TO DO IF YOU SMELL GAS: • Do not try to light any appliance. • Do not touch any electrical switch; do not use any phone in your building. • Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions. • If you cannot reach your gas supplier, call the fire department. – Installation and service must be performed by a qualified installer

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

210737 ..... ... 210737-1 .... ....210737-1 .... ... 210737-1 22 2 .. Panel, Side Jacket Insert................ .......... 211074....... .......211074...... ..... 211074 ..... .....211074...... ......211074 ..... ..... 211074 23 1 .. Panel, Top Jacket........................... .......... 210733....... ..... 210733-1 .... ....210733-2.... ... 210733-3 .... ....210733-4.... ... 210733-5 24 . . . 1 . . . .. Panel, Mid-Jacket Ass'y.................. .....211072...... ......211072 ..... ... 21

SHORT TRIM Versatile Multi-Venting Configurations n Two-pipe direct-venting vertical and /or horizontal sidewall, with all combustion makeup air drawn from outside the building 70 Equivalent Feet Exhaust 70 Equivalent Feet Intake 90 Degree Elbows = 10 Feet 45 Degree Elbows = 5 Feet Boot Tee = 5 Feet n Standard-venting, vertical or horizontal sidewall 100 Equivalent Feet Max 90 Degree Elbows = 10 Feet 45 Degree Elbows = 5 Feet Boot Tee = 5 Feet DIRECT-VENTING SIDEWALL CONVENTIONAL VENTING VENTING

Where the appliance may be installed in a humid atmosphere, make sure air circulation around the module and gas control is adequate to prevent condensation. It is also important to regularly check out the system. A NEMA 4 enclosure may be needed. Corrosive Chemicals Corrosive chemicals can also attack the module and gas control and eventually cause a failure. Where chemicals may be used routinely for cleaning, make sure the cleaning solution cannot reach the controls. Where chemicals are likely

A low water cutoff device of the float type should be flushed every six months. 6 DRAIN VALVE (Not Supplied) Additional drain valves must be obtained and installed on each boiler and tank for draining purposes. SAFETY RELIEF VALVES Your local code authority may have other specific relief valve requirements not covered below. WARNING THE PURPOSE OF A SAFETY RELIEF VALVE IS TO AVOID EXCESSIVE PRESSURE WHICH MAY CAUSE TANK EXPLOSION, SYSTEM OR BOILER DAMAGE. TOAVOID WATER DAMAGE A DRAIN LINE MUST B

Repair or replace any parts that are worn, damaged, or failing to make a good connection. AOS WPC - Tech Training 42 of 72 Ashland City, TN © 2007 Servicing should only be performed by a Qualified Service Agent VF BOILER SERVICE MANUAL ERROR MESSAGES (CONT) DISPLAYED MESSAGE CONDITION/INDICATES CHECK/REPAIR “Display Fail” • Plug UIM comm cable into the other “internal” comm port on the MCB. (see page 32) Communication between the MCB and UIM has • Check comm cable to the UIM. Turn off power been

Smith’s line of Century® Motors. This pocket manual is designed for one purpose — to make it simple for you to install, maintain and troubleshoot Century pool and spa motors. Contrary to what you may be thinking just n o w, your last name doesn’t have to be Edison in order to p roperly service the motors shown in the following pages. All you need are a few basic tools and some helpful hints; the kind that appear throughout this booklet. We’ve included all the information we think you’ll need to