SDT-SET-I-O Rev C Installation & Operation Manual Models: SDT/SET065 - 119 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.
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.
SDT/SET Installation & Operation Manual Please read before proceeding WARNING NOTICE 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.
SDT/SET Installation & Operation Manual 1 General Information The Lochinvar SDT/SET series indirect water heater (FIG. 1-1) is designed to generate domestic hot water in conjunction with a solar panel using forced circulation with a backup heat source. This indirect water heater consists of a 316L Stainless Steel tank in which a smooth 304L stainless steel coil is located (Table 1A). Solar heating fluid is pumped through the coil and heats the water in the tank.
SDT/SET Installation & Operation Manual 2 1. 2. 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. 1. Choose a location for your water heater centralized to the piping system. You must also locate the SDT/SET water heater where it will not be exposed to freezing temperatures.
SDT/SET Installation & Operation Manual 3 Boiler Side Piping (SDT models) 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 3C are developed through the coil. This requires properly sized piping and a properly sized pump.
SDT/SET Installation & Operation Manual 3 Boiler Side Piping (SDT models) Table 3A Pressure Drop Chart SDT/SET065-080 (continued) Table 3B Pressure Drop Chart SDT/SET119 Table 3A Pressure Drop Chart SDT/SET065-080 Table 3B Pressure Drop Chart SDT/SET119 SDT / SET065 - 080 FRICTION LOSS SDT / SET119 FRICTION LOSS 10.00 10.00 SOLAR COIL SOLAR COIL 12.00 10.00 8.00 8.00 BOILER BOILER COILCOIL 6.00 6.00 4.00 4.00 BOILER COIL 8.00 FT/HD FT/HD FT/HD SOLAR COIL 6.00 4.00 2.00 2.00 2.00 0 0.
SDT/SET Installation & Operation Manual 3 Boiler Side Piping (SDT models) Figure 3-1 Piping Diagram Zoned with Circulators ZONE #1 PRESSURE REDUCING VALVE ZONE #2 PRESSURE GAUGE 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 (SDT models) (continued) Figure 3-2 Piping Diagram Zoned with Valves ZONE #1 ZONE #2 PRESSURE REDUCING VALVE PRESSURE GAUGE BACKFLOW PREVENTER MAKE UP WATER ZONE #4 ZONE #3 ZONE VALVES (TYPICAL) SYSTEM SUPPLY SENSOR (WHEN USED) DIFFERENTIAL PRESSURE BYPASS VALVE (IF USED) SYSTEM CIRCULATOR AIR SEPARATOR EXPANSION TANK HOT WATER OUT NOT TO EXCEED 4 PIPE DIA.
SDT/SET Installation & Operation Manual 3 Boiler Side Piping (SDT models) Figure 3-3 Knight Boiler Primary / Secondary Piping PRESSURE REDUCING VALVE BACKFLOW PREVENTER PRESSURE GAUGE MAKE UP WATER SYSTEM SUPPLY SENSOR AIR SEPARATOR TO SYSTEM BALL VALVE (TYPICAL) NOT TO EXCEED4 PIPE DIA.
SDT/SET Installation & Operation Manual 3 Boiler Side Piping (SDT models) (continued) Figure 3-4 Multiple Tank Connections PRESSURE REDUCING VALVE BACKFLOW PREVENTER MAKE UP WATER PRESSURE GAUGE AIR SEPARATOR SYSTEM SUPPLY SENSOR TO SYSTEM BALL VALVE (TYPICAL) NOT TO EXCEED 4 PIPE DIA.
SDT/SET Installation & Operation Manual 4 Domestic Side (Tank) Piping Basic Domestic Piping Domestic Water Piping for Distant Fixtures Figure 4-2 on page 15 shows typical domestic water piping for a tank. The function of the components shown are as follows: 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.
SDT/SET 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.
SDT/SET 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 temperature and pressure relief valve and the tank.
SDT/SET Installation & Operation Manual 4 Domestic Side (Tank) Piping (continued) Figure 4-2 Recommended Domestic Water Piping SDT/SET models SHOCK ARRESTOR UNION (TYPICAL) SHUTOFF VALVE ANTI-SCALD MIXING VALVE SHUTOFF VALVE FROM BOILER SHUTOFF VALVE TO BOILER (SDT MODELS ONLY) SHUTOFF VALVE NOTE: UPPER COIL REPLACED WITH ELEMENT ON SET MODELS BOILER TANK SENSOR/ AQUASTAT BACKFLOW PREVENTOR EXPANSION TANK BOILER BACKUP HEAT EXCHANGER ( SDT MODELS ONLY ) SOLAR SENSOR FROM SOLAR RECIRCULATION
SDT/SET Installation & Operation Manual 5 Wiring Electrical Connection (Squire solar water heater with electric back up only -- SET models only) WARNING Tank must be full before unit is turned on! The heating element will be damaged if energized for even a short period of time while tank is dry! CAUTION Be sure to ground the water heater. The preferred way to ground is to use rigid metal conduit between the main panel and the water heater junction box with approved end fittings.
Installation & Operation Manual 5 Wiring (continued) Table 5A Wiring SET065-SET119 SET Wiring (Single Element) * Model Volts / Phase Watts / AMPS Breaker Type *Wire Gage SET065 240 VAC / 1 Ph 4500 / 18.3 25 AMP / DPDT 12 ga. THHW SET080 240 VAC / 1 Ph 4500 / 18.3 25 AMP / DPDT 12 ga. THHW SET119 240 VAC / 1 Ph 4500 / 18.3 25 AMP / DPDT 12 ga.
SDT/SET 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. 5-3).
SDT/SET Installation & Operation Manual 5 Wiring (continued) 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.
SDT/SET 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.
SDT/SET Installation & Operation Manual 7 Maintenance The Lochinvar SDT/SET 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 solar, boiler and domestic water piping is free of leaks.
SDT/SET Installation & Operation Manual 8 Performance Data Table 8A SET Backup Recovery Performance Model Heat Exchanger Volume Gallons Solar Heated Water Volume Gallons Recovery Back Up Minutes * First Draw Gallons 65°F Rise 90°F Rise 115°F 140°F SET065 2.2 28 78 108 34 26 SET080 2.2 35 89 123 44 31 SET119 3.
SDT/SET Installation & Operation Manual 8 Performance Data (continued) Table 8C First Hour Rating - 180°F Boiler Loop Water (Knight and Wall Mount Boilers, Upper Coil SDT Models) First Hour Rating - 180°F Boiler Loop Water (Knight Boiler - SDT065 - SDT119) Model Boiler Supply Water Circulator Flow GPM 5 Domestic Outlet 8 SDT065 SDT080 SDT119 180 180 180 12 16 20 5 8 12 16 20 5 8 117 92 117 92 122 97 122 97 138 113 138 113 K/WB081 72,000 169 129 169 129 174 134 174 134 191 150
SDT/SET Installation & Operation Manual 8 Performance Data Table 8E First Hour Rating 200°F Boiler Loop Water (Universal Sizing, Upper Coil SDT Models) First Hour Rating - 200°F Boiler Loop Water (Universal Sizing - 45,000 - 295,000 Btu/hr / SDT065-119) Model Boiler Supply Water Circulator Flow GPM Boiler Heating Capacity Domestic Outlet SDT065 200 5 8 12 SDT080 200 16 20 5 8 12 SDT119 200 16 5 8 45,000 117 94 117 94 122 99 122 99 135 113 135 113 60,000 146 115 146 115 151 120 151 120
SDT/SET Installation & Operation Manual 9 High Output Piping High Domestic Hot Water Usage Parallel Piping When a large amount of hot water is required by a Domestic Hot Water system, the dual coil indirect water heater can be piped together when given the high volume needed to satisfy the high load demands. This is achieved by piping the boiler coil and solar coil together. This will enable heat transfer to both the heat exchangers at the same time. This is done by series piping or piping in parallel.
SDT/SET Installation & Operation Manual 9 High Output Piping Figure 9-1 Indirect Boiler with Series Piping Table 9A Parallel Configuration PRESSURE REDUCING VALVE BACKFLOW PREVENTER PRESSURE GAUGE MAKE UP WATER AIR SEPARATOR SYSTEM SUPPLY SENSOR TO SYSTEM BALL VALVE (TYPICAL) Model Boiler Flow GPM SDT065 20 180° F 338 396 253,399 SDT080 20 180° F 344 414 257,897 SDT119 20 180° F 466 567 349,360 Y-STRAINER (RECOMMENDED) BOILER CIRCULATOR EXPANSION TANK * Tank temperature was 1
SDT/SET Installation & Operation Manual 9 High Output Piping (continued) Figure 9-2 Indirect Boiler with Parallel Piping Table 9C Series Configuration BACKFLOW PREVENTER MAKE UP WATER AIR SEPARATOR PRESSURE GAUGE SYSTEM SUPPLY SENSOR TO SYSTEM BALL VALVE (TYPICAL) Model Boiler Flow GPM SDT065 20 180° F 380 438 284,886 SDT080 20 180° F 391 461 293,133 SDT119 20 180° F 530 631 397,341 PRESSURE REDUCING VALVE Y-STRAINER (RECOMMENDED) EXPANSION TANK BOILER CIRCULATOR * Tank tem
Revision Notes: Revision A (ECO C05788) initial release. Revision B (ECO C05936) reflects the addition of “High Output Piping” section on pages 25-27, Series and Parallel piping diagrams on pages 26-27, and new friction loss charts for SDT Series and Parallel on pages 26 and 27.
