SIT-I-O Rev H Installation & Operation Manual Models: SIT030 - SIT119 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. WARNING This manual must only be used by a qualified heating installer / service technician. Read all instructions before installing.
Contents HAZARD DEFINITIONS .................................................... 2 PLEASE READ BEFORE PROCEEDING ........................ 3 1. GENERAL INFORMATION Operating Restrictions ........................................................ 4 Single-Wall Heat Exchanger .............................................. 4 2. PRE-INSTALLATION Locating the Tank............................................................... 5 Recommended Clearances ................................................ 5 3.
Installation & Operation 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. NOTICE Failure to comply with the above could result in severe personal injury, death or substantial property damage.
Installation & Operation Manual 1 General information The Lochinvar SIT 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 & Operation Manual 2 1. Pre-installation 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. Locating the tank 1. Choose a location for your water heater centralized to the piping system. You must also locate the SIT water heater where it will not be exposed to freezing temperatures.
Installation & Operation 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 & Operation Manual 3 Boiler side piping (continued) Figure 3-1 Piping Diagram Zoned with Circulators ZONE #1 PRESSURE REDUCING VALVE PRESSURE GAUGE ZONE #2 ZONE #3 ZONE #4 BACKFLOW PREVENTER ZONE CIRCULATORS (TYPICAL) MAKE UP WATER SYSTEM SUPPLY SENSOR (WHEN USED) AIR SEPARATOR EXPANSION TANK HOT WATER OUT NOT TO EXCEED 4 PIPE DIA.
Installation & Operation Manual 3 Boiler side piping Figure 3-2 Piping Diagram Zoned with Valves ZONE #1 PRESSURE REDUCING VALVE PRESSURE GAUGE ZONE #2 ZONE #3 ZONE #4 BACKFLOW PREVENTER ZONE VALVES (TYPICAL) SYSTEM SUPPLY SENSOR (WHEN USED) MAKE UP WATER DIFFERENTIAL PRESSURE BYPASS VALVE (IF USED) SYSTEM CIRCULATOR AIR SEPARATOR EXPANSION TANK NOT TO EXCEED 4 PIPE DIA.
Installation & Operation Manual 3 Boiler side piping (continued) Figure 3-3 Knight Boiler Primary / Secondary Piping PRESSURE REDUCING VALVE BACKFLOW PREVENTER PRESSURE GAUGE MAKE UP WATER AIR SEPARATOR SYSTEM SUPPLY SENSOR TO SYSTEM BALL VALVE (TYPICAL) FROM SYSTEM SYSTEM CIRCULATOR Y-STRAINER (RECOMMENDED) EXPANSION TANK BOILER CIRCULATOR DOMESTIC HOT WATER CIRCULATOR DRAIN POINT (TYPICAL) ANTI-SCALD MIXING VALVE HOT WATER OUT COLD WATER IN TANK SENSOR/ AQUASTAT CHECK VALVE UNION (TYPICA
Installation & Operation Manual 3 Boiler side piping Figure 3-4 Multiple Tank Connections PRESSURE REDUCING VALVE BACKFLOW PREVENTER PRESSURE GAUGE MAKE UP WATER AIR SEPARATOR TO SYSTEM SYSTEM SUPPLY SENSOR NOT TO EXCEED 4 PIPE DIA.
Installation & Operation Manual 4 Domestic side (tank) piping Basic domestic piping Domestic water piping for distant fixtures Figure 4-2 on page 14 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. In some cases the furthest fixture may be quite distant from the tank. Such an installation would result in an unacceptable delay before hot water reaches these distant fixtures.
Installation & Operation Manual 4 Domestic side (tank) piping 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. ASSE1017 and ASSE1070 certified valves are recommended. Usually, the maximum temperature of the outlet water will stay near the setting of the tank control.
Installation & Operation Manual 4 Domestic side (tank) piping Verify that the combination temperature and pressure relief valve complies with local codes. If the combination temperature and pressure relief valve does not comply with local codes, replace it with one that does. Follow the installation instructions in this section. NOTICE Do not place a valve between the combination T&P relief valve and the tank.
Installation & Operation Manual 4 Domestic side (tank) piping Figure 4-2 Recommended Domestic Water Piping SHOCK ARRESTOR UNION (TYPICAL) SHUT-OFF VALVE ANTI-SCALD MIXING VALVE SHUT-OFF VALVE SHUT-OFF VALVE TO BOILER FROM BOILER SHUT-OFF VALVE BACKFLOW PREVENTOR EXPANSION TANK TANK SENSOR/ AQUASTAT CHECK VALVE RECIRCULATION PUMP SQUIRE NOTICE 14 DRAIN ( FIELD SUPPLY) Please note that these illustrations are meant to show system piping concept only, the installer is responsible for all equ
Installation & Operation Manual 5 Wiring Indirect water heater sensor setup (Knight boiler) CAUTION NOTICE Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. The sensor supplied contains an Auto Reset High Limit (194°F). Install tank sensor Connect tank sensor The tank sensor is a dual sensor which controls the temperature of the tank from the boiler(see FIG. 4-1).
Installation & Operation Manual 5 Wiring Indirect water heater controlled using Aquastat and zone circulator / valve 1. Install Aquastat to tank. Aquastat control (TST20016) can be ordered from your local Lochinvar distributor. 2. Connect Aquastat to the zone controller for the Indirect Water Heater Zone. 3. Adjust Aquastat to the desired temperature.
Installation & Operation 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 & Operation Manual 7 Maintenance The Lochinvar SIT 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: * Make sure that the rest of the boiler and domestic water piping is free of leaks. Homeowner monthly maintenance to include: 1. Close the water heater drain valve by turning the knob clockwise.
Installation & Operation Manual 8 Performance data Table 8A IBR Chart Squire Indirect Water Heater I=B=R Rating Indirect Water Heater Model Number Potable Water Volume Gal. Heat Source Water Volume Gal. SIT030 27.0 1.1 1.5 160 183 99,000 14.0 3.9 SIT040 40.0 1.6 0.9 181 208 115,000 14.0 4.5 SIT050 51.6 1.7 0.8 209 255 133,000 14.0 5.3 SIT065 67.0 1.9 0.7 263 327 154,000 14.0 5.7 SIT080 81.5 2.1 0.6 266 347 160,000 14.0 5.7 SIT119 113.4 3.2 0.
Installation & Operation Manual 8 Performance data 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.
Installation & Operation Manual - 8 Performance data (continued) Table 8B First Hour Rating - 180°F Boiler Loop Water (Knight Boiler) First Hour Rating - 180°F Boiler Loop Water (Knight Boiler - Models SIT030 - SIT050) Model Circulator Flow GPM Boiler Heating Capacity Domestic Outlet SIT030 5 8 12 SIT040 16 20 5 8 12 SIT050 16 20 5 8 12 16 20 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 WB050 108 83 108 83 1
Installation & Operation Manual 8 Performance data (continued) Table 8C First Hour Rating - 180°F Boiler Loop Water (Universal Sizing) First Hour Rating - 180°F Boiler Loop Water (Universal Sizing - 45,000 - 295,000 Btu/hr) Model Circulator Flow GPM Boiler Heating Capacity Domestic Outlet SIT030 5 8 12 SIT040 16 20 5 8 12 SIT050 16 20 5 8 12 16 20 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 45,000 108 83 108
Installation & Operation Manual 8 Performance data (continued) Table 8D First Hour Rating 200°F Boiler Loop Water (Universal Sizing) First Hour Rating - 200°F Boiler Loop Water (Universal Sizing - 45,000 - 295,000) Model Circulator Flow GPM Boiler Heating Capacity Domestic Outlet SIT030 5 8 12 SIT040 16 20 5 8 12 SIT050 16 20 5 8 12 16 20 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 45,000 105 84 105 84 118 9
Revision Notes: Revision A (ECO C05265) initial release. Revision B (ECO C05399) reflects the addition of the Pressure Drop Chart and updates made to the Performance Data Charts. Revision C (ECO C05587) reflects the update of tables 3A and 3B (Pressure Drop charts) on page 6, table 4A on page 13, the update of the “Domestic water piping” paragraph on page 11, and the update of Performance data table 8A on page 19. Revision D (ECO C05788) reflects new images for section 3 “Boiler Side Piping” FIG.
