Table of Contents
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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 & Operation
Manual
Models: SIT030 - SIT119
This manual must only be used by
WARNING
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.
Save this manual for future reference.
SIT-I-O Rev H
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Summary of Contents for Lochinvar SQUIRE SIT030
- Page 1 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.
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Page 2: Table Of Contents
To Fill the Water Heater ... 18 To Drain the Water Heater ... 18 8. PERFORMANCE DATA IBR Chart... 19 How to Properly Size Your Indirect Water Heater ... 20 Performance Data Charts ... 21-23 REVISION NOTES ... Back Cover... -
Page 3: Please Read Before Proceeding
Use lowest possible temperature setting. Install some type of tempering device, such as an automatic mixing valve, at hot water tap or water heater. Automatic mixing valve must be selected and installed according to valve manufacturer’s recommendations and instructions. Installation & Operation Manual... -
Page 4: General Information
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). -
Page 5: Pre-Installation
Max. installed in a drain pan suitable for water heaters. Lochinvar shall not be held liable for any such water damage. The tank may be located some distance from the boiler... -
Page 6: Boiler Side Piping
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. -
Page 7: Piping Diagrams
Boiler side piping Figure 3-1 Piping Diagram Zoned with Circulators PRESSURE REDUCING VALVE BACKFLOW PREVENTER MAKE UP WATER SYSTEM SUPPLY (WHEN USED) AIR SEPARATOR EXPANSION TANK NOT TO EXCEED 4 PIPE DIA. OR A MAXIMUM OF 12" APART DRAIN POINT (TYPICAL) BALL VALVE (TYPICAL) - Page 8 Boiler side piping Figure 3-2 Piping Diagram Zoned with Valves PRESSURE PRESSURE REDUCING VALVE GAUGE BACKFLOW PREVENTER MAKE UP WATER AIR SEPARATOR EXPANSION TANK NOT TO EXCEED 4 PIPE DIA. OR A MAXIMUM OF 12" APART DRAIN POINT (TYPICAL) BALL VALVE Y-STRAINER (TYPICAL) BOILER...
- Page 9 Boiler side piping Figure 3-3 Knight Boiler Primary / Secondary Piping PRESSURE REDUCING VALVE BACKFLOW PRESSURE PREVENTER GAUGE MAKE UP WATER SEPARATOR SYSTEM SUPPLY SENSOR SYSTEM SYSTEM BALL VALVE CIRCULATOR (TYPICAL) EXPANSION TANK DRAIN POINT (TYPICAL) (TYPICAL) TEMPERATURE / Please note that these illustrations are meant to show system piping concept only, the installer is responsible NOTICE for all equipment and detailing required by local codes.
- Page 10 Boiler side piping Figure 3-4 Multiple Tank Connections PRESSURE REDUCING VALVE BACKFLOW PREVENTER PRESSURE GAUGE MAKE UP WATER SEPARATOR SYSTEM SUPPLY SENSOR SYSTEM SYSTEM BALL VALVE CIRCULATOR (TYPICAL) EXPANSION TANK DRAIN POINT (TYPICAL) TEMPERATURE / Please note that these illustrations are meant to show system piping concept only, the installer is responsible NOTICE for all equipment and detailing required by local codes.
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Page 11: Domestic Side (Tank) Piping Basic Domestic Piping
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: Shut-off valves (recommended) - Used to isolate the tank for servicing. b. -
Page 12: Anti-Scald Valves (Mixing Valves)
BTU discharge capacity not less than shown in Table 4A. Install the combination temperature and pressure relief valve into the opening provided and marked for this purpose on the water heater. against excessive pressure, install pressure... - Page 13 SIT030/040/050 - 3/4" NPT with a minimum CSA Rating of 105,000 Btu/hr. SIT065/080/119 - 3/4" NPT with a minimum CSA Rating of 200,000 Btu/hr. The Lochinvar SIT series water heaters NOTICE will absorb/store less than 200,000 Btu/ when domestic temperature is 210°F and boiler water...
- Page 14 Domestic side (tank) piping Figure 4-2 Recommended Domestic Water Piping ANTI-SCALD MIXING VALVE TO BOILER FROM BOILER Please note that these illustrations are meant to show system piping concept only, the installer is responsible NOTICE for all equipment and detailing required by local codes. SHOCK ARRESTOR UNION (TYPICAL)
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Page 15: Wiring Indirect Water Heater Sensor Setup (Knight Boiler)
Adjust the tank setpoint program. Knight Installation and Operation Manual for a detailed explanation of the tank setpoint program. Figure 5-1 Indirect Water Heater Controlled Using Tank Sensor INDIRECT TANK Connect tank sensor Turn OFF the power to the unit. Use wire strippers to strip one inch of insulation from the ends of each wire that will be spliced. -
Page 16: Indirect Water Heater Controlled Using Aquastat And Zone Circulator
Wiring Indirect water heater controlled using Aquastat and zone circulator / valve Install Aquastat to tank. Aquastat control (TST20016) can be ordered from your local Lochinvar distributor. Connect Aquastat to the zone controller for the Indirect Water Heater Zone. Adjust Aquastat to the desired temperature. -
Page 17: Start-Up And Check-Out
This is particularly important if the indirect water heater will be unused for an extended period of time after installation. Flush the indirect water heater by drawing at least three times its volume from the tank. 3. Make sure that all electrical connections are made correctly and that no exposed high voltage wiring is present. -
Page 18: Maintenance
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... -
Page 19: Performance Data
Performance data Table 8A IBR Chart Squire Indirect Water Heater Indirect Heat Potable Water Source Water Heater Water Volume Model Volume Gal. Number Gal. SIT030 27.0 SIT040 40.0 SIT050 51.6 SIT065 67.0 SIT080 81.5 SIT119 113.4 • These ratings were obtained with a heat source output and heat source flow rate as listed in the chart using the parameters of the Domestic Cold Water Inlet at 58°F, Domestic Temperature Rise of 77°F, and a Boiler Temperature Output of 180°F. -
Page 20: How To Properly Size Your Indirect Water Heater
First Hour Rating Proceed to pages 21 – 23 of this manual to locate your Indirect Water Heater and Boiler in the sizing charts. Using the First Hour Rating calculated in this worksheet, locate your Indirect Water Heater and Boiler along with your First Hour Rating. - Page 21 Performance data 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 SIT030 Circulator Flow 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 WB050 108 83 108 83 K/WB080...
- Page 22 Performance data 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 SIT030 Circulator Flow 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 45,000 108 83 108 83 60,000...
- Page 23 Performance data Table 8D First Hour Rating 200°F Boiler Loop Water (Universal Sizing) First Hour Rating - 200°F Boiler Loop Water Model SIT030 Circulator Flow 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 45,000 105 84 105 84 60,000...
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Page 24: Performance Data Charts
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”...
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Questions and answers
Just moved into a home with a Squire model number SIT030 - SIT119. I’m getting a “Lockout” message ( attached picture) And I have no hot water. Can you help me resolve this issue? Thank you