Indirect Fired Water Heaters Installation and Operating Manual ® C Models: SST150-40 SST250-65 SST300-80 SST450-119 US CAUTION The heat transfer medium must be water or other nontoxic fluid having a toxicity rating or class of 1, as listed in Clinical Toxicology of Commercial Products, 5th edition. The pressure of the heat transfer medium must be limited to a maximum of 30 PSIG by an approved safety or relief valve.
Installation & Operating Manual 2 | Indirect Fired Water Heaters Installation and Operating Manual
Installation & Operating Manual Table of Contents 1 General Information 6 2 Pre-installation 7 3 Boiler Side Piping 8 4 Domestic Side (Tank) Piping 13 5 Wiring 17 6 Start-up and Check-out 18 7 Maintenance 19 8 Performance Data 21 Limited Lifetime Warranty 25 Indirect Fired Water Heaters Installation and Operating Manual |3
Installation & Operating Manual Hazard Definitions The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or to important information concerning the life of the product. DANGER DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. WARNING WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
Installation & Operating Manual Please Read Before Proceeding WARNING Installer – Read all instructions before installing. Perform steps in the order given. Have this indirect water heater serviced/inspected by a qualified service technician, at least annually. Failure to comply with the above could result in severe personal injury, death or substantial property damage.
Installation & Operating Manual 1 General Information The SST series indirect water heater (FIG. 1-1) is designed to generate domestic hot water in conjunction with a hot water boiler using forced boiler water circulation. This indirect water heater consists of a 316L Stainless Steel tank in which a smooth 304L stainless steel coil is located (Table 1A). Boiler water is pumped through the coil and heats the water in the tank.
Installation & Operating Manual 2 Pre-installation 1. The installation must conform to the instructions in this manual and all applicable local, state, provincial, and national codes, laws, regulations, and ordinances. Installations in Canada must conform to B149.2 Installation Code. 2. Be certain the domestic water supply to the tank has physical and chemical characteristics that fall within the limits shown in Table 2A.
Installation & Operating Manual 3 Boiler Side Piping Figures 3-1 thru 3-4 show typical boiler side piping for several common situations. Regardless of which system is used it is imperative that the flow rates called for in Table 3B are developed through the coil. This requires properly sized piping and a properly sized pump.
Installation & Operating Manual AIR SEPARATOR ANTI-SCALD MIXING VALVE HOT WATER OUT GB 142 BOILER COLD WATER IN DHW TANK PUMP SYSTEM SUPPLY SENSOR PRESSURE RELIEF VALVE AIR SEPARATOR TANK SENSOR TO SYSTEM BALL VALVE (TYPICAL) FROM SYSTEM SYSTEM PUMP CHECK VALVE DRAIN POINT Y-STRAINER (RECOMMENDED) EXPANSION TANK SST series tank RECIRCULATION PUMP DRAIN ( FIELD SUPPLY ) Figure 3-1 GB142 Boiler Low Loss Header piping and DHW priority NOTICE Please note that these illustrations are meant to
Installation & Operating Manual ZONE #1 PRESSURE REDUCING VALVE PRESSURE GAUGE ZONE #2 ZONE #3 ZONE #4 BACKFLOW PREVENTER ZONE PUMPS (TYPICAL) MAKE UP WATER AIR SEPARATOR EXPANSION TANK HOT WATER OUT ANTI-SCALD MIXING VALVE GB 142 BOILER COLD WATER IN CHECK VALVE PUMP PRESSURE RELIEF VALVE BALL VALVE DRAIN POINT TANK SENSOR Y-STRAINER (RECOMMENDED) RECIRCULATION PUMP CHECK VALVE SST series tank DRAIN ( FIELD SUPPLY ) Figure 3-2 Piping diagram zoned with circulators and DHW priority NOTIC
Installation & Operating Manual ZONE #1 PRESSURE REDUCING VALVE PRESSURE GAUGE ZONE #2 ZONE #3 ZONE #4 BACKFLOW PREVENTER ZONE PUMPS (TYPICAL) MAKE UP WATER AIR SEPARATOR EXPANSION TANK BALL VALVE HOT WATER OUT DHW TANK PUMP ANTI-SCALD MIXING VALVE COLD WATER IN FLOW CHECK VALVE Y-STRAINER (RECOMMENDED) PRESSURE RELIEF VALVE BALL VALVE G115WS/G125BE/GB125BE DRAIN POINT TANK SENSOR RECIRCULATION PUMP CHECK VALVE SST series tank DRAIN ( FIELD SUPPLY ) Figure 3-3 Piping diagram of floor sta
Installation & Operating Manual AIR SEPARATOR HOT WATER OUT GB 142 BOILER ANTI-SCALD MIXING VALVE COLD WATER IN DHW TANK PUMP RECIRCULATION PUMP AIR SEPARATOR CHECK VALVE SYSTEM SUPPLY SENSOR TO SYSTEM BALL VALVE (TYPICAL) PRESSURE RELIEF VALVE (TYPICAL) FROM SYSTEM SYSTEM PUMP DRAIN POINT TANK SENSOR (TYPICAL) Y-STRAINER (RECOMMENDED) EXPANSION TANK SST series tank SST series tank DRAIN ( FIELD SUPPLY ) Figure 3-4 Multiple tank connections in reverse return NOTICE Please note that the
Installation & Operating Manual 4 Domestic Side (Tank) Piping Basic Domestic Piping Figure 4-2 shows typical domestic water piping for a tank. The function of the components shown are as follows: a. Shut-off valves (recommended) - Used to isolate the tank for servicing. b. Backflow Preventer (required by some codes) Used to prevent water from backing out of the tank in the event that inlet water pressure drops. c.
Installation & Operating Manual Anti-scald Valves (Mixing Valves) Anti-scald valves used with water heaters are also called tempering valves or mixing valves. An anti-scald valve mixes cold water in with the outgoing hot water to assure that hot water reaching a building fixture is at a temperature low enough to be safe. Usually, the maximum temperature of the outlet water will stay near the setting of the tank control.
Installation & Operating Manual Do not place a valve between the combination temperature and pressure relief valve and the tank. Standard Installation • Install the T&P relief valve in the connection marked “Relief Valve”. Determine T&P relief valve size by the following specifications, unless they conflict with local codes: T&P Relief Valve Discharge Piping T&P relief valve discharge piping must be: - made of material serviceable for a temperature of 250°F or greater.
Installation & Operating Manual SHOCK ARRESTOR UNION (TYPICAL) SHUTOFF VALVE ANTI-SCALD MIXING VALVE SHUTOFF VALVE SHUTOFF VALVE FROM BOILER SHUTOFF VALVE TO BOILER BACKFLOW PREVENTER EXPANSION TANK TANK SENSOR / AQUASTAT CHECK VALVE RECIRCULATION PUMP SST SERIES TANK DRAIN ( FIELD SUPPLY) Figure 4-2 Recommended domestic water piping NOTICE Please note that these illustrations are meant to show system piping concept only, the installer is responsible for all equipment and detailing required
Installation & Operating Manual 5 Wiring Wiring using boiler sensor: 1. For wiring using boiler sensor, see boiler installation manual. Indirect Water Heater Controlled Using Aquastat and Zone Circulator / Valve: 1. Install Aquastat to tank. Aquastat control (Honeywell L4006 or equivalent) can be ordered from your local distributor. 2. Connect Aquastat to the zone controller for the Indirect Water Heater Zone. 3. Adjust Aquastat to the desired temperature.
Installation & Operating Manual 6 Start-up and Check-out 1. Make sure the system is free of leaks and that air is purged from the system. CAUTION Fix any leaks found before proceeding further. Leakage from the boiler piping can result in severe damage to the boiler. 2. Many soldering fluxes contain Zinc Chloride which can cause severe corrosion damage to stainless steel. After completing all domestic water connections, flush the indirect water heater thoroughly before leaving the installation.
Installation & Operating Manual 7 Maintenance The SST series indirect water heater is an extremely simple device and as such requires very little maintenance. There are, however, several items which should be checked out on an annual or as needed basis to ensure a reliable supply of hot water: 5. • Make sure that the rest of the boiler and domestic water piping is free of leaks. 1. • The indirect water heater depends upon the boiler for a source of heat and is therefore only as reliable as the boiler.
Installation & Operating Manual as listed in the “Clinical Toxicology of Commercial Products”. A maximum 50/50 mixture of inhibited propylene glycol is recommended. Follow the antifreeze manufacturer’s instructions. WARNING Do not use automotive, ethylene glycol or petroleum-based antifreeze. These types of antifreezes are toxic and could cause severe personal injury or death if leakage into the domestic hot water supply occurs. Do not use any undiluted antifreeze.
Installation & Operating Manual 8 Performance Data Indirect Water Heater I=B=R Rating Table 8A Potable Water Volume Gal. Heat Source Water Volume Gal. Standby Heat Loss F/hr Continuous Draw Rating Gal/hr First Hour Rating Gal/hr Minimum Heat Output Rate from Heat Source Btu/hr Minimum Heat Source Flow Rate GPM Tank Heat Source Friction Loss Feet W.C SST150-40 40.0 1.6 0.9 181 208 115,000 14.0 4.5 SST250-65 67.0 1.9 0.7 263 327 154,000 14.0 5.7 SST300-80 81.5 2.1 0.
Installation & Operating Manual How to Properly Size Your Indirect Water Heater Use the First Hour Rating (FHR) to properly size your Indirect Water Heater. The First Hour Rating is the amount of hot water in gallons the heater can supply per hour (starting with a tank full of hot water), depending on tank capacity, source of heat, and the size of the burner. Estimate your peak hour demand as follows: • Determine what time of day (morning, noon, evening) you use the most hot water in your home.
Installation & Operating Manual First Hour Rating - 180°F Boiler Loop Water (Universal Sizing - 45,000 - 295,000 Btu/hr) Model SST150-40 Circulator Flow (GPM) Boiler Heating Capacity Domestic Outlet 5 8 SST250-65 12 115 140 115 140 45,000 122 97 122 60,000 150 118 75,000 179 95,000 115,000 115 140 20 115 5 140 8 12 140 115 140 97 153 128 153 128 150 118 183 149 183 149 138 179 138 213 170 213 170 217 165 217 165 217 165 252 197 252 217 165 252
Installation & Operating Manual First Hour Rating - 180°F Boiler Loop Water (Universal Sizing - 45,000 - 295,000 Btu/hr) Model SST300-80 Circulator Flow (GPM) Boiler Heating Capacity Domestic Outlet 5 8 SST450-119 12 115 140 115 140 45,000 163 138 163 60,000 193 159 75,000 222 95,000 115 140 20 140 8 12 115 140 138 197 172 197 172 193 159 226 193 226 193 180 222 180 255 213 255 213 261 207 261 207 261 207 294 241 294 115,000 300 235 300 235 300
Installation & Operating Manual Limited Lifetime Warranty For Domestic Hot Water Stainless Steel Tank Installed In A Residential Application MODELS COVERED This limited warranty is provided by Bosch Thermotechnology Corp. (BTC) and covers indirect stainless steel storage tanks installed in a one or two family residential dwelling (hereinafter referred to as “Tank”).
Installation & Operating Manual Additional Terms And Conditions Of The Limited Warranties For Domestic Hot Water Stainless Steel Tanks (For All Applications) ITEMS NOT COVERED The warranty for Commercial and Residential Domestic Hot Water Tanks does not cover the following circumstances: 1. Components or parts not provided by BTC. 2. Serviceable items and normal maintenance as required per the Installation Manual. 3. The workmanship of any installer.
Installation & Operating Manual Indirect Fired Water Heaters Installation and Operating Manual | 27
United States and Canada Bosch Thermotechnology Corp. 50 Wentworth Avenue Londonderry, NH 03053 Tel: 603-552-1100 Fax: 603-584-1681 www.bosch-climate.us BTC 471003301 B / 06.
