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Lochinvar SIT030 - page 1
Installation & Operation Manual Models: SIT030 - SIT119 This manual must only be used by a qualified heating installer / service technician. Read all instructions before installing. Perform steps in the order given. Failure to comply could result in severe personal injury, death, or substantial property damage. WARNING Save this manual for ...
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Lochinvar SIT030 - page 2
2 Hazard definitions The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk level s or to important information concerning the life of the product. DANGER WARNING CAUTION CAUTION NOTICE DANGER indicates an imminently hazardous situation which, if not avoided, will result ...
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Lochinvar SIT030 - page 3
Installation & Operation Manual Please read before proceeding 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 substan ...
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Lochinvar SIT030 - page 4
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 ...
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Lochinvar SIT030 - page 5
Installation & Operation Manual 5 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 phy ...
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Lochinvar SIT030 - page 6
Installation & Operation Manual 6 Multiple tank connections (boiler side) Multiple tank installations must be done in the “reverse-return” manner. The reason for this is to create the same pressure drop (and therefore, the same flow) through the coil of each tank. The boiler manifold piping must be sized so that each coil has the flow rate ...
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Lochinvar SIT030 - page 7
Installation & Operation Manual 7 SOLUTION BOILER SQUIRE COLD WATE R IN TEMPERATUR E / PRESSURE GAUGE AIR SEPARATO R BALL VALVE (TYPICAL) UNION (TYPICAL) PRESSURE RELIEF VALVE DRAIN PO INT (TYPICAL) MA KE UP WA TE R BOILER CIRCULAT OR BACKFLOW PREVENTER PRESSURE REDUCING VA LVE PRESSURE GAUGE EXPAN SION TANK ZONE CIRCULA TORS (TYPICAL) FLOW CHE ...
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Lochinvar SIT030 - page 8
8 Installation & Operation Manual SOLUTION BOILER ANTI-SCALD MIX ING VALVE COLD WAT ER IN TEMPERATUR E / PRESSURE GAUGE AIR SEPARATO R BALL VALVE (TYPICAL) UNION (TYPICAL) PRESSURE RELIEF VALVE DRAIN POI NT (TYPICAL) MA KE UP WA TE R HOT WATE R OUT BOILER CIRCULATOR BACKFLOW PREVENTER PRESSURE REDUCING VA LVE PRESSURE GAUGE EXPAN SION TANK ZONE ...
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Lochinvar SIT030 - page 9
Installation & Operation Manual 9 KNIGHT BOILER DOMESTIC HOT W ATER CIRCULATOR BACKFLOW PREVENTER PRESSURE REDUCIN G VALVE PRESSURE GAUGE ANTI-SCALD MIXING V ALV E COLD WATE R IN TEMPERATUR E / PRESSURE GAUGE AIR SEPARATOR EXPANSIO N TANK BALL VALVE (TYPICAL) UNION (TYPICAL) PRESSURE RELIEF VA LVE DRAIN POI NT (TYPICAL) MAKE UP WA TER FROM SYST ...
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Lochinvar SIT030 - page 10
Installation & Operation Manual 10 3 Boiler side piping KNIGHT BOILER DOMESTIC HOT W ATER CIRCULATOR TEMPERATURE / PRESSURE GAUGE UNION (TYPICAL) DRAIN DRAIN POINT (TYPICAL) HOT WA TER OUT BOILER CIRCULATOR PRESSURE RELIEF VALVE Y-STRAINER (RECOMMENDED ) COLD WA TER IN ANTI-SCALD MIXING VALVE RECIRCULATION PUMP DRAIN ( FIELD SUPPLY ) RELIEF VAL ...
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Lochinvar SIT030 - page 11
Installation & Operation Manual 11 4 Domestic side (tank) piping Basic domestic piping 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. b. Backflow Preventer (required by some codes) - Used to prev ...
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Lochinvar SIT030 - page 12
12 Installation & Operation Manual 4 Domestic side (tank) piping Temperature & pressure (T&P) relief valve For protection against excessive temperatures and pressure, install temperature and pressure protective equipment required by local codes. This equipment shall not be less than a combination temperature and pressure relief valve ce ...
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Lochinvar SIT030 - page 13
Installation & Operation Manual 13 NOTICE 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 The Lochinvar SIT series wat ...
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Lochinvar SIT030 - page 14
14 Installation & Operation Manual 4 Domestic side (tank) piping EXPAN SION TANK UNION (TYPICAL) SHOCK ARR ESTOR SHUT-OFF VALVE SHUT-OFF VALVE BACKFLOW PREVENTOR SHUT-OFF VALVE SHUT-OFF VALVE ANTI-SCALD MIX ING VALVE DRAIN ( FIELD SUPPL Y) RECIRCULATI ON PUMP TO BOILER FROM BOIL ER CHECK VA LVE TANK SENSOR/ AQUASTAT SQUIRE Figure 4-2 Recommende ...
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Lochinvar SIT030 - page 15
Installation & Operation Manual 5 Wiring Indirect water heater sensor setup (Knight boiler) Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation. CAUTION 1. Install the sensor inside the tank as depicted in FIG. 5-1. 2. Connect the wire leads to the DHW Tank Sensor (AUX) co ...
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Lochinvar SIT030 - page 16
16 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 te ...
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Lochinvar SIT030 - page 17
Installation & Operation Manual 17 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 corros ...
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Lochinvar SIT030 - page 18
18 Installation & Operation Manual 7 Maintenance * Make sure that the rest of the boiler and domestic water piping is free of leaks. * If there is an oil lubricated circulator in the system, make sure it is lubricated as called for by the circulator manufacturer. * Make sure that the boiler is maintained in accordance with the boiler manufactur ...
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Lochinvar SIT030 - page 19
Installation & Operation Manual 19 8 Performance data Squire Indirect Water Heater I=B=R Rating Indirect Water Heater Model Number 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 G ...
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Lochinvar SIT030 - page 20
Installation & Operation Manual 20 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 ...
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Lochinvar SIT030 - page 21
- Installation & Operation Manual 21 First Hour Rating - 180°F Boiler Loop Water (Knight Boiler - Models SIT030 - SIT050) Model SIT030 SIT040 SIT050 Circulator Flow GPM 5 8 12 16 20 5 8 12 16 20 5 8 12 16 20 Domestic Outlet 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 W ...
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Lochinvar SIT030 - page 22
Installation & Operation Manual 22 First Hour Rating - 180°F Boiler Loop Water (Universal Sizing - 45,000 - 295,000 Btu/hr) Model SIT030 SIT040 SIT050 Circulator Flow GPM 5 8 12 16 20 5 8 12 16 20 5 8 12 16 20 Domestic Outlet 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 ...
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Lochinvar SIT030 - page 23
Installation & Operation Manual 23 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 SIT030 SIT040 SIT050 Circulator Flow GPM 5 8 12 16 20 5 8 12 16 20 5 8 12 16 20 Domestic Outlet 115 140 115 140 115 140 115 140 115 140 115 140 115 140 ...
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Lochinvar SIT030 - page 24
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” paragr ...
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