
Installation, Operation and Maintenance Instructions Document 2095DH2022800DThese instructions are to be stored next to the water heater for reference
LAARS Heating Systems CompanyPage 10Figure 10. Horizontal Vent Terminations.(b) Vent TerminationA side wall vent terminal (hood) must be usedwhen th
Mighty Stack Water HeaterPage 11Figure 12. Location of Parts in Control Box.NOTE: Ensure expansion tank pressure rating issufficient to withstand sy
LAARS Heating Systems CompanyPage 12Figure 13. Connection Diagram.Mighty-StackMODEL TL80H2022500GIF ANY OF THE ORIGINAL WIRE (AS SUPPLIED WITH THE APP
Mighty Stack Water HeaterPage 13Figure 14. Wiring Schematic.H2022500G
LAARS Heating Systems CompanyPage 14SECTION 2.Operating Instructions•Water temperature over 125°F (52°C)can cause severe burns instantly ordeath from
Mighty Stack Water HeaterPage 15NOTE: Safe lighting and other performancecriteria were met with the gas manifold and controlassembly provided on the w
LAARS Heating Systems CompanyPage 16FOR YOUR SAFETY READ BEFORE OPERATINGWARNING: If you do not follow these instructions exactly, a fire orexplosion
Mighty Stack Water HeaterPage 17SECTION 3.Maintenance and ServiceWARNINGFollow local regulations with respect to installationof carbon monoxide (CO) d
LAARS Heating Systems CompanyPage 185. The pilot and main burners will then light, butonly if these conditions are satisfied:• Aquastat closed – indic
Mighty Stack Water HeaterPage 19Figure 17. Troubleshooting Flowchart.YESNOTurn gas supplyoff. Set aquastatto call for heat.Is gas valvepowered? (Shoul
LAARS Heating Systems CompanyPage 2TABLE OF CONTENTSSECTION 1.General Information1A. Introduction ... 3
LAARS Heating Systems CompanyPage 20Figure 18. General View Showing Major Assemblies/Components.3G. Parts Listing
Mighty Stack Water HeaterPage 21Figure 19. Heater Cabinet Components.Part No. Description19 T2008400 Tile, Rear18 T2008300 Tile, Side, Left and Right1
LAARS Heating Systems CompanyPage 22Figure 20. Electrical/Control Components.Part No. Description7 E2078000 Temperature Controller (Aquastat)6 E207450
Mighty Stack Water HeaterPage 23Figure 21. Plumbing/Piping and Pumps.Part No. Description9 A0095600 Bell & Gossett Pump8 20440007 Piping Assembly
LAARS Heating Systems CompanyPage 24Figure 22. Tank and Tank Cabinet.Part No. Description17 P2032500 Drain Boiler Brz 1/2" NPT16 A2003300 Temp /
Mighty Stack Water HeaterPage 25Figure 23. Burner Tray Assembly.Part No. Description7 L0032700 8001-10000 FT - Gas Orifice, Propane7 L0050400 8001-100
LAARS Heating Systems CompanyPage 26Figure 24. Flue Collector Assembly.Part No. Description4 20425402 Outlet Flue Collar3 A2000200 Induced Draft Blowe
Mighty Stack Water HeaterPage 27Figure 25. Heat Exchanger.Part No. Description6 P0027000 Pipe Plug, Brass, 3/4 NPT5 P2023100 Nipple, Brass 1/2 NPT4 P2
H2022800D800.900.9276 • Fax 800.559.1583 (Customer Service, Service Advisors)20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.33551
Mighty Stack Water HeaterPage 3SECTION 1.General InformationWARNINGTo install this unit correctly, you must follow theprocedures listed in this manual
LAARS Heating Systems CompanyPage 4Figure 1. Dimensions.Figure 2. Component Locations.Dimensions shownin inches (mm).
Mighty Stack Water HeaterPage 5Figure 4. Installation in Closet.water will not damage areas below the appliance.If a suitable location can not be fou
LAARS Heating Systems CompanyPage 6Note: When measuring the inlet supply pressure, thewater heater and all other gas appliances sharing thewater heate
Mighty Stack Water HeaterPage 71J. General Venting InstructionsWARNINGThis water heater must be vented in accordancewith Part 7, Venting of Equipment,
LAARS Heating Systems CompanyPage 8• When the water heater and a boiler are to beconnected to the same chimney, each unit musthave its own vent connec
Mighty Stack Water HeaterPage 9Figure 9. Horizontal Venting.Outside wallVent systemWaterheaterThimbleBoiler venting detailCaulk entire jointincluding
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