1. DL manuals
  2. A.O. Smith
  3. Water Heater
  4. BTI-120
  5. Installation & Operation Manual

A.O. Smith BTI-120 Installation & Operation Manual

Other manuals for BTI-120: Replacement Parts List
Manual is about: COMMERCIAL GAS, GLASS-LINED, TANK-TYPE WATER HEATER

Summary of BTI-120

  • Page 1

    1 models bti 120 thru 400/a commercial gas, glass-lined, tank-type water heater • installation • operation • maintenance • limited warranty place these instructions adjacent to heater and notify owner to keep for future reference. Part no. 195809-000 printed in u.S.A. 0803 supersedes part no.194780-...

  • Page 2: Rough-In-Dimensions

    2 rough-in-dimensions model bti-120 bti-154 bti-180 bti-199 bti-200 bti-250 bti-275 bti-310 bti-366 bti-400 dim. Inches mm inches mm inches mm inches mm inches mm inches mm inches mm inches mm inches mm inches mm a 63 1800 70 1778 70 1778 70 1778 72 1829 72 1829 72 1829 73 1854 73 1854 73 1854 b 4 1...

  • Page 3: Table of Contents

    3 table of contents rough-in-dimensions ................................................ 2 foreword ..................................................................... 3 general safety information .................................. 4 precautions .......................................................

  • Page 4: General Safety

    4 general safety information precautions do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect the appliance and to replace any part of the control system and any gas control which has been under water. If the unit is exposed to the fo...

  • Page 5: Features

    5 • do not apply insulation to the top of the water heater, as this will interfere with safe operation of drafthood. • do not cover the temperature & pressure relief valve. • do not cover the instruction manual. Keep it on the side of the water heater or nearby for future reference. • do obtain new ...

  • Page 6: Installation Instructions

    6 electronic ignition control each heater is equipped with a ignition module. The solid state ignition control (fig. 4), ignites the main burner by utilizing a silicone nitride ignitor. The silicone nitride ignitor shuts off during the heating cycle and the main burner flame is sensed through a remo...

  • Page 7

    7 warning flammable items, pressurized containers or any other potential fire hazardous articles must never be placed on or adjacent to the heater. Open containers or flammable material should not be stored or used in the same room with the heater. When installing the heater, consideration must be g...

  • Page 8

    8 and one in or within 12 inches (30.5cm) of the enclosure bottom. Each opening shall have a free area of at least one square inch per 1000 btuh (2,225mm 2 /kw)of the total input of all appliances in the enclosure, but not less than 100 square inches (645 square cm). If the confined space is within ...

  • Page 9

    9 type b gas vent multiple gas fired tank-type heaters when venting multiple tank type heaters using type b vent pipe, follow the installation diagram (figure 4) and tables below which give sizing and data based upon nfpa 54/ansi z223. 1992. Technical data venting model bti-120 input: 120,000 btu/hr...

  • Page 10

    10 model bti-250 input: 250,000 btu/hr total vent height (feet) vent connector size: 6 inches 6 8 10 15 20 30 50 100 input btuh/hr rise vent connector diameter (inches) 250,000 1 ft 8 8 7 7 7 6 6 6 250,000 2 ft 7 7 7 7 6 6 6 6 250,000 3 ft 7 7 7 7 6 6 6 6 number combined input bti 250 of heaters in ...

  • Page 11

    11 water line connections this manual provides detailed installation diagrams (see pages 15-21 of this manual) for typical methods of application for the water heaters. The water heater may be installed by itself, or with a separate storage tank, on both single and two-temperature systems. When used...

  • Page 12

    12 malfunction of the supply system, the gas valve must be checked for safe operation. Make sure that the outside vents on the supply regulators and the safety vent valves are protected against blockage. These are parts of the gas supply system, not the heater. Vent blockage may occur during ice sto...

  • Page 13

    13 heater wiring all electrical work must be installed in accordance with the latest version of the national electrical code ansi/nfpa no. 70, must conform to all local code authority having jurisdiction. An electrical ground is required to reduce risk of electrical shock or possible electrocution. ...

  • Page 14

    14 installation diagrams-top inlet/outlet usage use of the top inlet water connection requires installation of an inlet dip tube (refer to figure 11). The tube is supplied in the heater. Follow caution labels if applying heat to this fitting. Do not allow pipe dope to contact the plastic tube during...

  • Page 15

    15 vertical storage tank and forced circulation danger temperature setting should not exceed safe use temperature at fixtures. See water temperature control warning on page 25. If higher preheat temperatures are necessary to obtain adequate booster output, add an anti- scald valve for hot water supp...

  • Page 16

    16 danger temperature setting should not exceed safe use temperature at fixtures. See water temperature control warning on page 25. If higher preheat temperatures are necessary to obtain adequate booster output, add an anti- scald valve for hot water supplied to fixtures. Two temperature - one heate...

  • Page 17

    17 installation diagrams-side inlet/outlet usage danger temperature setting should not exceed safe use temperature at fixtures. See water temperature control warning on page 25. If higher preheat temperatures are necessary to obtain adequate booster output, add an anti- scald valve for hot water sup...

  • Page 18

    18 one or two temperature - one heaters, high temperature storage with or without recirculation heater with or without mixing valve heater with mixing valve and recirculated sanitizing loop note 1: toggle switch controls 180°f (82°c) water circulation. Install on or close to dishwashing machine. Tog...

  • Page 19

    19 two temperature - two pre-heaters with mixing valve or booster heater with or without building recirculation two pre-heaters with mixing valve two pre-heaters with booster heater danger temperature setting should not exceed safe use temperature at fixtures. See water temperature control warning o...

  • Page 20

    20 medium temperature - one heater with auxiliary storage tank forced circulation with or without building recirculation vertical storage tank horizontal storage tank danger temperature setting should not exceed safe use temperature at fixtures. See water temperature control warning on page 25. If h...

  • Page 21: Manifold Kits

    21 model dimension “a” bti-120 63” bti-154 70” bti-180 70” bti-199 70” bti-200/a 72” bti-250/a 72” bti-275/a 72” bti-310/a 73” bti-366/a 73” bti-400/a 73” manifold kits two unit manifold kit (part no. 195686) three unit manifold kit (part no. 195687) four unit manifold kit (part no. 195688).

  • Page 22: Operation

    22 table 8 approximate time required to consume 1 cu. Ft. Of gas at full capacity time req’d input type btuh to consume rate of per 1 cu. Ft. (btuh) gas cu. Ft. Of gas 120,000 natural 1050 31.5 sec. (35kw) propane 2500 75.0 sec. 154,000 natural 1050 24.5 sec. (45kw) propane 2500 58.4 sec. 180,000 na...

  • Page 23: Sequence of Operation

    23 sequence of operation the following information will describe the sequence of operation for this appliance. 1. Switch power on to unit. 2. Thermostat calls for heat. 3. Ignition control board performs diagnostic check on system components. 4. On completion of diagnostics check, the ignition contr...

  • Page 24

    24 a. This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the burner. Do not try to light the burner by hand. B. Before operating smell all around the appliance area for gas. Be sure to smell next to the floor because some gas is heavier than air a...

  • Page 25: Preventive Maintenance

    25 water temperature control danger this water heater is equipped with an adjustable thermostat to control water temperature. 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 in...

  • Page 26

    26 note: 1. Remove main burners from unit. 2. Check that burner venturi and ports are free of foreign debris. 3. Clean burners with bristle brush and/or vacuum cleaner - do not distort burner ports or pilot location. 4. Reinstall burners in unit. Make sure front and rear of burners are installed cor...

  • Page 27

    27 if the appliance installation includes other relief valves, such as in “remote” storage tanks etc., check their relief valve operation with the same frequency. Warning the water passing out of the valve during this checking operation may be extremely hot. Avoid contact and discharge safely to pre...

  • Page 28

    28 4. Remove lime, scale, or sediment using care not to damage the glass lining. 5. Inspect cleanout plate gasket, if new gasket is required, replace with a. O. Smith part no. 99038. 6. Install cleanout plate. Be sure to draw plate up tight by tightening screws securely. 7. Replace outer jacket cove...

  • Page 29: Service

    29 7. Lower container, you may have to place the container on its empty carton to prevent the un•lime from flowing back into the container. 8. Let un•lime remain in the heater for 5 minutes and then lower the container to the "drain" position, see figure 16. 9. Deliming activity is indicated by foam...

  • Page 30

    30 sequence of operation flow chart description of this flow chart can be found in the “sequence of operation” section found on page 23. Switch power on to unit. Thermostat calls for heat. Ignition control board performs diagnostic check on components ignition control board sends power to exhaust in...

  • Page 31

    31 remedy complaint cause user serviceman *water not hot enough. Thermostat set too low. Set thermostat dial to a higher temperature. Thermostat out of calibration. Call serviceman recalibrate thermostat. If thermostat cannot be recalibrated, replace. *insufficient hot water thermostat set too low. ...

  • Page 32

    32 model bti limited warranty a. O. Smith corporation, the warrantor, extends the following limited warranty to the owner of this water heater. 1. The tank if the glass-lined tank in this water heater shall prove upon examination by the warrantor to have leaked due to natural corrosion from potable ...