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  5. Operation Manual

A.O. Smith 160M Operation Manual

Manual is about: COMMERCIAL GAS COPPER HEAT EXCHANGER WATER HEATER BURKAY UP-FLOW MODELS

Summary of 160M

  • Page 1

    1 part no. 212626-000 printed in u.S.A. 0905 supersedes part no. 192011- 000 rev. 4 models hw-120m, 160m, 200m, 225m commercial gas copper heat exchanger water heater burkay up-flow models including models with intermittent pilot ignition (i.I.D.) a division of a.O. Smith corporation mcbee, south ca...

  • Page 2: Rough-In-Dimensions

    2 rough-in-dimensions heater performance data note: to compensate for the effects of high altitude areas above 2000 feet, input rating, and therefore recovery ratings, should be reduced approximately 4% for each 1000 feet above sea level. Recovery rating of models shown in chart above are obtained b...

  • Page 3: Foreword

    3 foreword this design complies with the latest edition of the ansi standard z21.10.3 for gas water heaters vol. Iii storage water heaters with input ratings above 75,000 btu per hour circulating and instantaneous. Detailed installation diagrams are in this manual. These diagrams will serve to provi...

  • Page 4

    4 should overheating occur or the gas supply fail to shut off, turn off the manual gas control valve to the appliance. Heater must be protected from freezing downdrafts during shutdown periods. Grounding instructions this water heater must be grounded in accordance with the national electric code an...

  • Page 5: Features

    5 automatic gas shutoff control the automatic gas shutoff control, fig. 1, is an automatic safety device which activates at a water temperature of approximately 195 0 f (90.5°c). This limits the water outlet temperature to a maximum of 200 0 f (87.7°c). The device is wired in series with the gas val...

  • Page 6

    6 4. Discontinues ignition spark when the pilot flame is established. The s-8600 control used on propane gas models provides safety lockout if the pilot fails to ignite within the pilot flame establishing period. The s-8600 control used on natural gas models continues trial for ignition until pilot ...

  • Page 7

    7 caution any part of the paddle must not touch the pipe or any restrictions in the pipe. Screw the flow switch in position so the flat of the paddle is at right angles to the flow. The arrow on the side case must point in the direction of the flow. The safety flow switch may be field adjusted to ob...

  • Page 8: Installation Instructions

    8 installation instructions important strict adherence to installation wiring diagrams shown in this manual is required to prevent constant pump operation when the system temperature control is satisfied, otherwise the warranty is void as stipulated under item 2a (6) of the limited warranty. Require...

  • Page 9

    9 confined space when drawing combustion and dilution air from inside a conventionally constructed building to a confined space, such a space shall be provided with two permanent openings, one in or within 12 inches (30.5cm) of the enclosure bottom. Each opening shall have a free area of at least on...

  • Page 10

    10 your local code authority may have other specific relief valve requirements not covered in this section. The purpose of a relief valve is to avoid excessive pressure or temperature into the steam range, which may cause scalding at fixtures, tank explosion, system or heater damage. To avoid scaldi...

  • Page 11: Piping Diagrams

    11 piping diagrams (use this diagram for straight recovery systems supplying hot water at one temperature only) figure 7 danger temperature setting should not exceed safe use temperature at fixtures. See water temperature control warning on page 19. If higher preheat temperatures are necessary to ob...

  • Page 12

    12 figure 8 danger temperature setting should not exceed safe use temperature at fixtures. See water temperature control warning on page 19. If higher preheat temperatures are necessary to obtain adequate booster output, add an anti-scald valve for hot water supplied to fixtures..

  • Page 13

    13 figure 9 figure 10 danger temperature setting should not exceed safe use temperature at fixtures. See water temperature control warning on page 19. If higher preheat temperatures are necessary to obtain adequate booster output, add an anti-scald valve for hot water supplied to fixtures..

  • Page 14

    14 gas connections warning the inlet gas pressure must not exceed the value specified by the manufacturer on the rating plate (10.5" w.C. - natural gas, 13.0" w.C. - propane gas). Exposure to higher gas supply pressure may cause damage to the gas valve which could result in fire or explosion. If ove...

  • Page 15

    15 electrical wiring diagrams for the hw-120m, 160m, 200m and 225m water heaters i.I.D. System (natural) figure 11 a minimum gas supply pressure of 4.5" w.C. (1.12kpa) for natural gas and 11" w.C. (1.74kpa) for propane gas is required for purposes of input adjustment. Electrical information all elec...

  • Page 16

    16 electrical wiring diagrams for the hw-120m, 160m, and 200m water heaters i.I.D. System (propane) figure 12 notes:.

  • Page 17: Operation

    17 operation important only qualified personnel shall perform the initial firing of the heater. At this time the user should not hesitate to ask the start-up technician any questions regarding the operation and maintenance of the unit. Lighting and operating instructions are included with this manua...

  • Page 18

    18 operating instructions for i.I.D. Models the i.I.D. Models have an automatic intermittent spark ignition system, figure 3, mounted on the jacket at the front of the heater which ignites the pilot gas whenever system controls call for heat. Start the unit in accordance with the instructions on the...

  • Page 19

    19 danger hot water temperatures required for automatic dishwasher and laundry use can cause scald burns resulting in serious personal injury and/ or death. The temperature at which injury occurs varies with the person’s age and time of exposure. The slower response time of children, aged or disable...

  • Page 20: Service Information

    20 service information the installer may be able to observe and correct certain problems which may arise when the unit is put into operation. However, it is recommended that only qualified service personnel, using appropriate test equipment, be allowed to service the heater. Any safety devices used ...

  • Page 21

    21 pilot burner used on i.I.D. Systems figure 15 protector switch (coil high limit - all heaters) if the protector switch, fig 2, should shut off unit, check for the following conditions: 1. No water in heater. 2. Restricted water flow through the heater. 3. Excessive liming. 4. Improper wiring (aut...

  • Page 22: Preventive Maintenance

    22 preventive maintenance recommended procedure for periodic removal of lime deposits from coil type commercial water heaters the amount of calcium carbonate (lime) released from water is in direct proportion to water temperature and usage, see fig. 17. Caution do not use a nylon brush or other stat...

  • Page 23

    23 the usage of water softening equipment greatly reduces the hardness of the water. However, this equipment does not always remove all of the hardness (lime). For this reason it is recommended that a regular schedule for deliming be maintained. The time between cleaning will vary from weeks to mont...

  • Page 24: Checkout

    24 chart 1 - cer-temp 80 recovery system checkout procedure (use this checkout for cer-temp 80 recovery systems) checkout the checkout sequence should be used as an on-the-job trouble- shooting guide to identify the cause of incorrect system operation and suggest a remedy for its correction. Because...

  • Page 25

    25 chart 2 s8600 (natural gas and lp gas) intermittent pilot system troubleshooting no spark at pilot burner turn gas supply off. Is voltage (24 vac) across the 24 v terminals on “call for heat”? Is voltage (24 vac) across the pv & mv/pv terminals on “call for heat”? Note: (for lp models only) pilot...

  • Page 26

    26 chart 2 s8600 (natural gas and lp gas) intermittent pilot system troubleshooting ensure all manual shutoff valves are fully open; all filters are clean; all gas connections are gas tight; pilot tubing is not damaged, obstructed or kinked; and pilot orifice is unclogged. Check for air in gas line,...

  • Page 27

    27 chart 2 s8600 (natural gas and lp gas) intermittent pilot system troubleshooting pilot burner lights but main burner does not light does the pilot flame cover 3/8” to 1/2” of igniter/sensor rod? Does spark stay on for more than 30 seconds after the pilot is “proven” (lit)? Is the pilot burner ign...

  • Page 28

    28 model hw limited warranty a. O. Smith corporation, the warrantor, extends the following limited warranty to the owner of this water heater. 1. If within five years after initial installation of this water heater, a heat exchanger, coil or gas burner shall prove upon examination by the warrantor t...