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MODELS HW/HWB 300, 399, 420, 520, 610, 670
GAS-FIRED COMMERCIAL COPPER BOILERS FOR
HYDRONIC HEATING AND HOT WATER SUPPLY
UP-FLOW MODELS
• INSTALLATION • OPERATION • MAINTENANCE • LIMITED WARRANTY
• INDOOR ONLY
WARNING: If the information in this manual
is not followed exactly, a fire or explosion
may result causing property damage,
personal injury or death.
— Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
— WHAT TO DO I
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ROUGH-IN DIMENSIONS EXTRA OPENING FOR THERMOMETER AND RELIEF VALVE HW/HWB-520, 610 AND HW--670 HW/HWB-610 AND HW-670 NATURAL GAS ONLY TABLE 1 MODELS Prop. Nat. HWB/ HWB/ HWB/ HWB/ HWB/ HWB/ DIMENSIONS IN INCHES HW-300 HW-399 HW-420 HW-520 HW-610/670 HW-610/670 A Overall height 65 (1651) 57-1/8 (1451) 57-1/8 (1451) 68-5/16 (1735) 67 (1702) 64-3/4 (1645) B Height to top of jacket 43-1/4 (1099) 45-1/8 (1146) 45-1/8 (1146) 56-1/4 (1429) 56-1/4 (1429) 56-1/4 (1429) C Floor to
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TABLE 3, RECOVERY CAPACITIES - CANADIAN MODELS ONLY Input Temp. (C) 11 17 22 26 33 39 44 50 56 61 67 72 78 Model (Btu/Hr.) Rise (F) 20 30 40 50 60 70 80 90 100 110 120 130 140 HW-300 300,000 LPH 5,505 3,670 2,753 2,202 1,835 1,573 1,376 1,223 1,001 1,001 918 847 786 GPH 1,455 970 727 582 485 416 364 323 291 264 242 224 208 HW-399 399,000 LPH 7,322 4,882 3,661 2,929 2,441 2,092 1,831 1,627 1,464 1,331 1,220 1,127 1,046 GPH 1,935 1,290 967 774 645 553 484 430 387 352 322 298 276 HW-420 420,000 LP
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FOREWORD the locations indicated in the diagrams as these are necessary for checking CAUTION the operation of the boiler. TEXT PRINTED OR OUTLINED IN RED CONTAINS INFORMATION RELA TIVE TO YOUR SAFETY. PLEASE READ THOROUGHLY BEFORE USING MAKE SURE THE GAS ON WHICH THE BOILER WILL OPERATE IS THE SAME AS THAT SPECIFIED ON THE UNIT RATING PLATE. APPLIANCE. Detailed installation diagrams are in this manual. These diagrams will serve The boiler installation must conform to these instructions and th
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LOCATION WARNING FOR SAFE OPERATION PROVIDE ADEQUATE AIR FOR When installing the boiler, consideration must be given to proper COMBUSTION AND VENTILATION. AN INSUFFICIENT SUPPLY location. Location selected should be as close to the stack or OF AIR WILL CAUSE RECIRCULATION OF COMBUSTION chimney as practicable with adequate air supply and as centralized PRODUCTS RESULTING IN AIR CONTAMINATION THAT MAY BE with the piping system as possible. This location should also be HAZARDOUS TO LIFE. SUCH
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Where an exhaust fan is installed in the same room with a boiler, TABLE 4 sufficient openings for air must be provided in the walls. HWB/HW HWB/HW HWB/HW HWB/HW HWB/HW UNDERSIZED OPENINGS WILL CAUSE AIR TO BE DRAWN INTO 300 399 420 520 610 & 670 THE ROOM THROUGH THE CHIMNEY, CAUSING POOR TOP 28" (711.2) 32" (812.8) 24" (609.6) 24" (609.6) 24" (609.6) COMBUSTION. SOOTING MAY RESULT WITH AN INCREASED SIDES 6" (152.4) 6" (152.4) 24" (609.6) 24" (609.6) 24" (609.6) RISK OF ASPHYXIATION. REAR 6" (15
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1. CONVENTIONAL INSTALLATIONS All modern hydronic type boilers are exceptionally fast heating units. The low water volumes in relation to firing rates require special attention to water flow rates for smooth, efficient operation. These considerations for the A. O. Smith copper heat exchanger boilers are covered below. 0 0 Conventional 10 C (20 F) drop in systems for a fully loaded boiler will maintain the following approximate flow rates: U.S. CANADIAN MODELS MODELS LPM GPM HW-300 HWB-300 87 23
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NO. SUGGESTED ITEMS FOR INSTALLATION 1 Short pipe nipple and pair of boiler loop tees in piping between system supply and return. One set per each group of boilers 2 Boiler pipe loop. See piping sizing data above. 3 Boiler circulator. See pump sizing data above. 4 Thermometer. 5 Theraltimeter. 6 Plug cock to control flow rate. 7 Safety flow switches. For interlock with other systems or instead of low water cutoff. 8 Relief valve. 9 With one -300, -399 or -420 item 9 is - sensing element
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Excessive pressure may develop causing premature tank failure If the boiler is connected to chilled water piping or its heating coils or intermittent relief valve operation. This is not a warranty failure. are exposed to refrigerated air, the boiler piping system must be equipped with flow valves or other automatic means to prevent An expansion tank or a similar device may be required in the inlet gravity circulation through the boiler during the cooling cycle. supply line between the appliance
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IT IS IMPORTANT TO GUARD AGAINST GAS VALVE FOULING FROM 2A.SIZING GAS SUPPLY LINE (For single boiler installations and CONTAMINANTS IN THE GAS WAYS. SUCH FOULING MAY CAUSE for installations of multiples of two or three of same size boilers). IMPROPER OPERATION, FIRE OR EXPLOSION. Use table 6, or CAN/CSA B149.1-00 (latest recent edition) to size IF COPPER SUPPLY LINES ARE USED THEY MUST BE iron pipe or equivalent gas supply line. Table 6 is based on a CERTIFIED FOR GAS SERVICE. pressure drop of
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• In table 6, select the row showing the distance to the most TABLE 7 remote outlet or the next longer distance if the table does not MULTIPLIERS TO BE USED WITH TABLE 6 WHEN APPLYING give the exact length. This is the only distance used in THE GRAVITY FACTOR TO OTHER THAN .60 SPECIFIC GRAVITY determining the size of any section of gas piping. If the gravity Specific Specific factor is to be applied, the values in the selected row of table 6 Gravity Multiplier Gravity Multiplier are multiplied
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7. Set primary system temperature control dial (thermostat) to Vent connectors serving appliances vented by natural draft shall desired setting. not be connected into any portion of mechanical draft systems operating under positive pressure. WARNING The minimum distance from adjacent public walkways, adjacent DO NOT INCREASE GAS PRESSURE ABOVE THAT SPECIFIED buildings, openable windows and building openings shall not be ON THE RATING PLATE, AS OVERFIRING WILL RESULT IN less than those values s
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Where a continuous or intermittent back draft is found to exist the After it has been determined that each appliance remaining cause must be determined and corrected. A special vent cap may connected to the common venting system properly vents when be required. If the back draft cannot be corrected by the normal tested as outlined above, return doors, windows, exhaust fans, methods or if a suitable draft cannot be obtained, a blower type fireplace dampers and any other gas burning appliance to
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TABLE 9, COMBINED VENT SIZING TABLES MODEL HW/HWB-300 BOILER MODEL HW/HWB-610 BOILER Input: 300,000 Btuh Draft Hood Outlet 8" Input: 610,000 Btuh Draft Hood Outlet 12" Required Connector or Smoke Pipe Diameter Required Connector or Smoke Pipe Diameter Connector Total Vent Height(Measured in Feet Above Draft Hood) Connector Total Vent Height(Measured in Feet Above Draft Hood) Rise in 10 15 20 30 40 50 60 80 100 Rise in 10 15 20 30 40 50 60 80 100 Feet Connector Diameter (in Inches) Feet
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VENTING MAINTENANCE - STANDARD VENTING gas vent properly by passing a lighted match or taper around the edge of the relief opening of the draft hood. If the chimney or It is recommended that the heating surfaces and vent piping of gas vent is drawing properly, the match flame will be drawn into the appliance be checked every six months for dust, deterioration the draft hood. If not, the combustion products will tend to and carbon deposits. Remove all soot or other obstructions from extinguish
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The boiler, when installed, must be electrically bonded to ground The storage tank temperature and pressure (T & P) relief valve must comply with the applicable construction provisions of the in accordance with the requirements of the authority having Standard for Relief Valves and Automatic Gas Shutoff Devices for jurisdiction or, in the absence of such requirements, with the Hot Water Supply Systems, Z21.22 and/or CAN1-4.4. The T & P National Electrical Code, ANSI/NFPA 70 and/or the Canad
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CONNECTION DIAGRAM HWB & HW-300, -399, -420, -500 & -610 (NATURAL GAS) ® SINGLE STAGE I.I.D. - ROBERTSHAW GAS VALVE HWB & HW-300, -399, -420, -520, -610 (NATURAL GAS ONLY) - CANADIAN MODELS FIGURE 10 ® Robertshaw is a registered trademark of Fulton Controls Corp. 17 17 17 17 17
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CONNECTION DIAGRAM HWB, HW-420,-520, -610 (PROPANE GAS) SINGLE STAGE PROPANE - ROBERTSHAW GAS VALVE 24 VOLT -HW, HWB-420, -520, -610 CANADIAN MODELS FIGURE 11 18 18 18 18 18
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CONNECTION DIAGRAM HWB & HW 300, 399 (PROPANE GAS) FIGURE 13 SINGLE STAGE PROPANE ROBERTSHAW GAS VALVE 24 VOLT - HWB, HW-300, 399 CANADIAN MODELS FIGURE 11A 19 19 19 19 19
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HW-300, HW-399, HW-420, HW-500 & HW-670 (NATURAL GAS) SINGLE STAGE I.I.D. - ROBERTSHAW GAS VALVE HW-300, -399, -420, -520 & 670 (NATURAL GAS ONLY) - U.S. MODELS FIGURE 11B 20 20 20 20 20
