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Lochinvar CW 745 manual

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Table of contents for the manual

  • Page 1

    DE SI GNE R ’ S GUI DE CO P P E R -F I N ® WA T E R H E A T E R 495,000 – 2,065,000 Btu/hr[...]

  • Page 2

    Dear Specifier/Project Manager , At Lochinvar , we have long recognized the importance of innovation to any product or service. Those who enter into business must also accept the challenge of meeting constantly changing needs. The designer ’ s guide you are now holding has been designed to make it more convenient for you to select the perfect Loc[...]

  • Page 3

    Lochinvar D ESI GNER ’ S GUID E COPPE R - FIN W A TER HE A TER 615-889-8900 1 Codes . . . . . . . . . . . . . . . . . . . . . . . . .2 Combustion & V entilation Air . . . . . . . . .5 Contaminants . . . . . . . . . . . . . . . . . . . .6 Determining T otal “Free Area” . . . . . . . .5 Electrical Requirements . . . . . . . . . . . .14 Gas [...]

  • Page 4

    CODES The equipment shall be installed in accordance with those installation regulations in effect in the local area where the installation is to be made. These shall be carefully followed in all cases. Authorities having jurisdiction shall be consulted before installations are made. In the absence of such requirements, the installation shall confo[...]

  • Page 5

    The indoor units must be installed so that the ignition system components are protected from water (dripping, spraying, rain, etc.) during appliance operation and ser vice (circulator replacement, control replacement, etc.). The appliance must be installed on a level, non-combustible floor . Concrete over wood is not considered a non-combustible fl[...]

  • Page 6

    4 Lochinvar D ESI GNER ’ S GUID E COPPE R - FIN W A TER HE A TER 615-889-8900 L o c hinv ar (FIG. 2) W A TER HEA TER EQUIPMENT AND CONTROL ORIENT A TION. RIGHT SIDE FLUE PRODUCTS VENT TERMINAL STRIP HOT W A TER OUTLET COLD W A TER INLET BURNER INSPECTION PORT FRONT GAS CONNECTION HOT W A TER OUTLET COLD W A TER INLET BURNER INSPECTION PORT FRONT [...]

  • Page 7

    Lochinvar D ESI GNER ’ S GUID E COPPE R - FIN W A TER HE A TER 615-889-8900 5 COMBUSTION & VENTILA TION AIR Provisions for combustion and ventilation air must be in accordance with Section 5.3, Air for Combustion and V entilation, of the latest edition of the National Fuel Gas Code, ANSI Z223.1 ; in Canada, the latest edition of CGA Standard [...]

  • Page 8

    6 Lochinvar D ESI GNER ’ S GUID E COPPE R - FIN W A TER HE A TER 615-889-8900 Btu (22 cm 2 per kW) of input, but not less than 100 square inches (645 cm 2 ). If a single combustion air opening is provided to bring combustion air in directly from the outdoors, the opening must be sized based on a minimum free area of one square inch per 3000 Btu i[...]

  • Page 9

    Categor y I double wall vent (or equivalent) connectors and sized according to vent sizing tables (F AN column) in the latest edition of the National Fuel Gas Code . The Categor y I vent and accessories, such as firestop spacers, thimbles, caps, etc., must be installed in accordance with the vent manufacturer’ s listing. The vent connector and fi[...]

  • Page 10

    8 Lochinvar D ESI GNER ’ S GUID E COPPE R - FIN W A TER HE A TER 615-889-8900 must be consistent with the National Fuel Gas Code Z223.1 or in Canada, the latest edition of CGA Standard B149 Installation Code for Gas Burning Appliances and Equipment. VENTING OPTIONS Conventional V enting A conventional venting system utilizes the natural buoyancy [...]

  • Page 11

    For this type of installation, it is best to use a draft control for each water heater located on the riser between the vent outlet and the breeching - Location “A”. When this riser is too short to per mit the installation of a draft control, locate a separate control for each water heater on the main breeching as illustrated in Location “B?[...]

  • Page 12

    10 Lochinvar D ESI GNER ’ S GUID E COPPE R - FIN W A TER HE A TER 615-889-8900 An outdoor unit should not be located so that high winds can deflect off of adjacent walls, buildings or shrubber y causing recirculation. Recirculation of flue products may cause operational problems, bad combustion or damage to controls. The unit should be located at[...]

  • Page 13

    A manual main gas shutoff valve is provided outside the jacket, upstream of the main gas valve. In Canada, derated 1 0% f r o m 2 , 000 - 4,500 ft., o v e r 4 , 500 ft. derate must be in accordance with local authorities. Consult factor y for installations at higher elevations. High Altitude Applications Atmospheric pressure decreases as the height[...]

  • Page 14

    LOW W A TER TEMPERA TURE DELIVER Y A number of water heating applications may require delivered water temperature in a system below 140°F . Systems such as nursing homes and hospitals would be examples of this type of system. A water heating system that will be operated at less than 140°F must use a mixing valve on the outlet side of the storage [...]

  • Page 15

    Due to pump capacity the following specifications cannot be exceeded when using the standard pump: • Not more than 45 feet of straight pipe. • For ever y elbow and tee in excess of those shown above, DEDUCT 5 FEET from maximum allowable straight pipe in heater-to-tank circulating loop. W A TER TREA TMENT In hard water areas, water treatment sho[...]

  • Page 16

    14 Lochinvar D ESI GNER ’ S GUID E COPPE R - FIN W A TER HE A TER 615-889-8900 Relief V alve This water heater is supplied with temperature and pressure relief valve(s) sized in accordance with ASME Boiler and Pressure V essel Code, Section IV “Heating Boilers.” ELECTRICAL REQUIREMENTS (North America) The appliance is wired for 120 volts. All[...]

  • Page 17

    Lochinvar D ESI GNER ’ S GUID E COPPE R - FIN W A TER HE A TER 615-889-8900 A1 W A TER HEA TER PIPING DIA GRAMS APPENDIX A PIPING DIAGRAM SINGLE HEA TER - SINGLE T ANK BUILDING HOT W A TER SUPPL Y RELIEF VA LV E LOCK-TEMP STORAGE TA N K DRAIN FULL PORT BALL V AL VE SYSTEM PUMP SYSTEM RELIEF V AL VE TEE ELBOW UNION EXP ANSION TA N K CHECK VA LV E [...]

  • Page 18

    A2 Lochinvar D ESI GNER ’ S GUID E COPPE R - FIN W A TER HE A TER 615-889-8900 PIPING DIAGRAM SINGLE HEA TER - TWO T ANK FULL PORT BALL V AL VE SYSTEM PUMP SYSTEM RELIEF V AL VE TEE ELBOW UNION EXP ANSION TA N K CHECK VA LV E THERMOMETER LEGEND BUILDING HOT W A TER SUPPL Y LOCHINV AR W ATER HEA TER COLD W A TER SUPPL Y BUILDING RETURN LOCK-TEMP S[...]

  • Page 19

    FULL PORT BALL V AL VE SYSTEM PUMP SYSTEM RELIEF V AL VE TEE ELBOW UNION EXP ANSION TA N K CHECK VA LV E THERMOMETER LEGEND PIPING DIAGRAM TWO TEMPERA TURE INST ALLA TION - SINGLE HEA TER-SINGLE T ANK HIGH TEMPERA TURE BUILDING RETURN LOW TEMPERA TURE BUILDING RETURN DRAIN INLET RELIEF VA LV E OUTLET COLD W A TER SUPPL Y 140 0 F HOT W A TER SUPPL Y[...]

  • Page 20

    A4 Lochinvar D ESI GNER ’ S GUID E COPPE R - FIN W A TER HE A TER 615-889-8900 PIPING DIAGRAM TWO HEA TERS-SINGLE T ANK FULL PORT BALL V AL VE SYSTEM PUMP SYSTEM RELIEF V AL VE TEE ELBOW UNION EXP ANSION TA N K CHECK VA LV E THERMOMETER REDUCING TEE REDUCING TEE LEGEND LOCHINV AR W A TER HEATERS INLET INLET OUTLET RELIEF VA LV E OUTLET BUILDING R[...]

  • Page 21

    Lochinvar D ESI GNER ’ S GUID E COPPE R - FIN W A TER HE A TER 6 1 5-889-8900 A5 FULL PORT BALL V AL VE SYSTEM PUMP SYSTEM RELIEF V AL VE TEE ELBOW UNION EXPANSION TA N K CHECK VA LV E REDUCING TEE REDUCING TEE LEGEND PIPING DIAGRAM TWO HEA TERS-TWO T ANKS BUILDING RETURN LOCHINV AR W A TER HEA TERS COLD W A TER SUPPL Y LOCK-TEMP STORAGE TA N K S[...]

  • Page 22

    A6 Lochinvar D ESI GNER ’ S GUID E COPPE R - FIN W A TER HE A TER 615-889-8900 PIPING DIAGRAM MUL TI-ST ACK FRAME W/ W A TER HEA TERS AND STORAGE T ANK LIT0396 Heater Heater Inlet/ Manifold Model Outlet Size Pipe Size CW495-745 2 ” 3 ” CW986-2066 2-1/2” 4”[...]

  • Page 23

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  • Page 24

    Loch invar Corporation • Lebanon, TN • 615-889-8900 / Fax: 615-547-1000 www .Lochinvar .com CW -DG-05 (Revised CW-DG-05 1/07) 4/09-Printed in U.S.A.[...]