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100273038_2000529317 Rev_B
Installation & Operation
Manual
Models: SIT040DW - SIT119DW
This manual must only be used by
WARNING
a qualified heating installer / service
technician. Read all instructions
LOW LEAD CONTENT
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.
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Table of Contents
Related Manuals for Lochinvar Squire SIT040DW
Summary of Contents for Lochinvar Squire SIT040DW
- Page 1 100273038_2000529317 Rev_B Installation & Operation Manual Models: SIT040DW - SIT119DW This manual must only be used by WARNING a qualified heating installer / service technician. Read all instructions LOW LEAD CONTENT before installing. Perform steps in the order given. Failure to comply could result in severe personal injury, death, or substantial property damage.
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Page 2: Table Of Contents
Contents HAZARD DEFINITIONS ............ 2 Anti-scald Valves (Mixing Valves) ......12 PLEASE READ BEFORE PROCEEDING ......3 Install Drain Valve ............12 1. GENERAL INFORMATION Temperature and Pressure (T&P) Relief Valve ..12 Operating Restrictions ............4 Table 4A - Minimum Relief Valve (AGA Rating) ... 13 Double-Wall Heat Exchanger .......... -
Page 3: Please Read Before Proceeding
Installation & Operation Manual Please read before proceeding Installer – Read all instructions before • Installation and service must be performed by a qualified WARNING installing. Perform steps in the order given. installer, service agency, or the gas supplier. Have this indirect water heater serviced/ Failure to adhere to the guidelines on this WARNING inspected by a qualified service technician, at... -
Page 4: General Information
Installation & Operation Manual General information Double-wall heat exchanger The Lochinvar SIT DW 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. Uniform plumbing code... -
Page 5: Pre-Installation
Characteristic Min. 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 Chloride (PPM) provided the pump is designed to provide the flow called for in Table 3B - Pressure Drop Values, through the coil. -
Page 6: Boiler Side Piping
Installation & Operation Manual Boiler side piping DHW prioritization Figures 3-1 thru 3-4 show typical boiler side piping for several common situations. Regardless of which system is This piping system is designed to provide direct hot water used it is imperative that the flow rates called for in Table priority over the other zones in the heating system. -
Page 7: Piping Diagrams
Installation & Operation Manual Boiler side piping (continued) Figure 3-1 Piping Diagram Zoned with Circulators ZONE #1 PRESSURE PRESSURE REDUCING VALVE GAUGE ZONE #2 ZONE #3 ZONE #4 BACKFLOW PREVENTER ZONE CIRCULATORS (TYPICAL) MAKE UP WATER SYSTEM SUPPLY SENSOR (WHEN USED) AIR SEPARATOR EXPANSION TANK... - Page 8 Installation & Operation Manual Boiler side piping Figure 3-2 Piping Diagram Zoned with Valves ZONE #1 PRESSURE PRESSURE REDUCING VALVE GAUGE ZONE #2 ZONE #4 ZONE #3 BACKFLOW PREVENTER ZONE VALVES (TYPICAL) SYSTEM SUPPLY SENSOR MAKE UP WATER (WHEN USED) DIFFERENTIAL PRESSURE BYPASS AIR SEPARATOR...
- Page 9 Installation & Operation Manual Boiler side piping (continued) Figure 3-3 Knight Boiler Primary / Secondary Piping PRESSURE REDUCING VALVE BACKFLOW PRESSURE PREVENTER GAUGE MAKE UP WATER SEPARATOR SYSTEM SUPPLY SENSOR FROM SYSTEM SYSTEM SYSTEM BALL VALVE CIRCULATOR Y-STRAINER (TYPICAL) (RECOMMENDED) EXPANSION TANK BOILER...
- Page 10 Installation & Operation Manual Boiler side piping Figure 3-4 Multiple Tank Connections PRESSURE REDUCING VALVE BACKFLOW PREVENTER PRESSURE GAUGE MAKEUP WATER SEPARATOR SYSTEM SUPPLY SENSOR FROM SYSTEM SYSTEM NOT TO EXCEED 4 PIPE DIA. SYSTEM OR A MAXIMUM OF 12” APART CIRCULATOR BALL VALVE Y-STRAINER...
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Page 11: Domestic Side (Tank) Piping Basic Domestic Piping
Installation & Operation Manual Domestic side (tank) piping Basic domestic piping Domestic water piping for distant fixtures Figure 4-2 on page 13 shows typical domestic water piping In some cases the furthest fixture may be quite distant from for a tank. The function of the components shown are as the tank. -
Page 12: Anti-Scald Valves (Mixing Valves)
SIT040/050DW - 3/4" NPT with a minimum CSA Rating of 105,000 Btu/hr. SIT065/080/119DW - 3/4" NPT with a minimum CSA Rating of 200,000 Btu/hr. The Lochinvar SIT DW series water heaters NOTICE will absorb/store less than 200,000 Btu/hr when DRAIN domestic water outlet temperature is 210°F... - Page 13 Installation & Operation Manual Domestic side (tank) piping (continued) T&P relief valve discharge piping MUST NOT be: Table 4A - excessively long. Using more than two (2) elbows or 15 Minimum Relief Valve (CSA Rating) feet of piping can reduce discharge capacity. - directly connected to a drain.
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Page 14: Wiring
Installation & Operation Manual Wiring Indirect water heater sensor setup (Knight boiler) Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and CAUTION dangerous operation. The sensor supplied contains an Auto Reset High Limit (194°F). NOTICE Connect tank sensor Install tank sensor... -
Page 15: Indirect Water Heater Controlled Using Aquastat And Zone Circulator
Indirect water heater controlled using Aquastat and zone circulator / valve 1. Install Aquastat to tank. Aquastat control (100208546) can be ordered from your local Lochinvar distributor. 2. Connect Aquastat to the zone controller for the Indirect Water Heater Zone. -
Page 16: Start-Up And Check-Out
Installation & Operation Manual Start-up and check-out 1. Make sure the system is free of leaks and that air is purged from the system. Fix any leaks found before proceeding CAUTION further. Leakage from the boiler piping can result in severe damage to the boiler. 2. -
Page 17: Maintenance
Installation & Operation Manual Maintenance The Lochinvar SIT DW series indirect water heater is an Homeowner monthly maintenance to include: extremely simple device and as such requires very little Visually check valves, pipes, and fittings for leaks. Call a maintenance. -
Page 18: Performance Data
Installation & Operation Manual Performance data Table 8A AHRI Chart Squire Indirect DW Water Heater AHRI Rating Minimum Heat Potable Heat Source Minimum Tank Heat Indirect Standby Continuous Output Rate Water Water First Hour Heat Source Source Water Heater Heat Loss Draw Rating from Volume... -
Page 19: How To Properly Size Your Indirect Water Heater
Installation & Operation Manual Performance data (continued) 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. -
Page 20: Performance Data Charts
Installation & Operation Manual 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 SIT040DW - SIT050DW) Model SIT040DW SIT050DW SIT065DW Circulator Flow GPM Domestic Outlet 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 52,500 WH/KH55... - Page 21 Installation & Operation Manual 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 - 140,000 Btu/hr) Model SIT040DW SIT050DW SIT065DW Circulator Flow Domestic Outlet 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 45,000...
- Page 22 Installation & Operation Manual Performance data Table 8D First Hour Rating - 200°F Boiler Loop Water (Universal Sizing) First Hour Rating - 200°F Boiler Loop Water (Universal Sizing - 45,000 - 225,000 Btu/hr) Model SIT040DW SIT050DW SIT065DW Circulator Flow Domestic Outlet 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 115 140 45,000 134 109...
- Page 23 Installation & Operation Manual Notes...
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Page 24: Revision Notes
Revision Notes: Revision A (Process #3000001798_Change #500002025) initial release. Revision B (PCP# 3000006451 / CN# 500006731) reflects the addition of the CSA 1-91 logo to the front cover. MM #100273038_DIR #2000529317 Rev B 02/17 - Printed in U.S.A.