Installation, Operation and Maintenance Instructions Document 2095D Installation, Operation and Maintenance Instructions for Mighty-Stack™ Gas-Fired Water Heater with Storage Tank Model TL80-199 These instructions are to be stored next to the water heater for reference purposes. FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician, qualified in hot water heater installation and maintenance.
LAARS Heating Systems Company Page 2 TABLE OF CONTENTS SECTION 1. General Information SECTION 2. Operating Instructions 1A. 1B. 1C. 1D. 1E. 1F. 1G. 1H. 1I. 1J. 1K. 1L. 1M. 1N. 1P. 2A. 2B. Introduction .................................................. 3 Warranty Information .................................... 3 Unpacking .................................................... 3 Heater Identification ..................................... 3 Dimensions ..................................................
Mighty Stack Water Heater SECTION 1. General Information Page 3 installation date and the name of the installer. Shipping costs are not included in the warranty coverage. 1C. Unpacking WARNING To install this unit correctly, you must follow the procedures listed in this manual. If you do not do this, the warranty offered by Laars will be voided. Follow the requirements of the local jurisdiction which has authority over the installation.
Page 4 LAARS Heating Systems Company Dimensions shown in inches (mm). Figure 1. Dimensions. Figure 2. Component Locations.
Mighty Stack Water Heater Page 5 water will not damage areas below the appliance. If a suitable location can not be found, install a drain pan under the appliance. Make sure the drain pan is properly piped to an adequate drain. 2. Place the water heater as close as possible to the vent or chimney. 3. For minimum clearances around the water heater, refer to Table 2. Maintain the minimum distances from all combustible surfaces (see Figure 4). The unit can be installed in a closet.
LAARS Heating Systems Company Page 6 Figure 5. Gas Supply Piping. 6. If you will be testing at a pressure greater than 1/2" psig (3.5 kPa) – Disconnect the gas line before the water heater and before the shutoff valve for the water heater. If you will be testing at a pressure equal to or less than 1/2 psig (3.5 kPa) – Turn off the manual shut off valve ahead of the water heater gas controls. Provide gas to the water heater at the pressure shown in Table 4.
Mighty Stack Water Heater Page 7 1J. General Venting Instructions For installation in U.S.A.: Water Heater Size 199 Outside Air Area† 50 sq in. 323 sq cm Inside Air Area†† 199 sq in. 1284 sq cm The area indicated is for one of two openings; one at floor level and one at ceiling, so the total net free area would be double the figures indicated. For special conditions, refer to NFPA54 ANSI Z223.1. † †† Outside air supply – Combustion air is supplied directly through an outside wall.
Page 8 LAARS Heating Systems Company the latest edition of ANSI Z223.1/NFPA 54. See “Sizing of Category I Venting Systems” and “Appendix G.” In Canada, follow the instructions in the CAN/CGA-B149 installation code. An unused chimney can be used as a raceway for a single-wall vent pipe (see Figure 7). Never run a vent pipe through a flue that has another appliance attached to it. (b) Vent Termination A listed vent terminal must complete the vertical run where it exits the chimney.
Mighty Stack Water Heater Page 9 Figure 8. Vertical Vent Termination. For best results, a horizontal vent system should be as short and straight as possible. The materials used in the vent connectors should be as listed in Table 7. Description High Temperature RTV 2" (51 mm) wide aluminum foil tape, backed with adhesive 2" (51 mm) wide aluminum foil tape backed with adhesive Manufacturer Product Dow Corning Trade Mate Venture Product #3243 3M Product #433 Table 6. Vent Sealing Material.
LAARS Heating Systems Company Page 10 Dimensions shown in feet (m). Figure 10. Horizontal Vent Terminations. (b) Vent Termination A side wall vent terminal (hood) must be used when the water heater is vented through a side wall. Use Laars Part Number D2004300, 4" (102 mm) dia. The vent hood provides a means of installing vent pipe through the building wall, and must be located in accordance with ANSI Z223.1/NFPA 54, or in Canada CAN/CGA-B149 and local applicable codes (see Figure 9).
Mighty Stack Water Heater Page 11 NOTE: Ensure expansion tank pressure rating is sufficient to withstand system operational pressure. 1N. Electrical Wiring 1. Check the voltage, frequency, and phase of the wiring to the water heater and pump. This unit is designed to operate on 115V AC, 60 Hz, single phase. (The controls and switches on this unit operate on 24V AC. This voltage is produced by a transformer and draws less than 12 amps.) 2.
Page 12 LAARS Heating Systems Company IF ANY OF THE ORIGINAL WIRE (AS SUPPLIED WITH THE APPLIANCE) MUST BE REPLACED, IT MUST BE REPLACED WITH APPLIANCE WIRING SUITABLE FOR 105°C OR ITS EQUIVALENT. Mighty-Stack MODEL TL80 H2022500G Figure 13. Connection Diagram.
Mighty Stack Water Heater Page 13 H2022500G Figure 14. Wiring Schematic.
LAARS Heating Systems Company Page 14 SECTION 2. Operating Instructions DANGER • • • • • WARNING Should overheating occur or the gas supply fail to shut off, turn off the manual gas control valve to the appliance. Water temperature over 125°F (52°C) can cause severe burns instantly or death from scalds. Children, disabled and elderly are at highest risk of being scalded. See instruction manual before setting temperature at heating appliance. Feel water before bathing or showering.
Mighty Stack Water Heater NOTE: Safe lighting and other performance criteria were met with the gas manifold and control assembly provided on the water heater when the unit underwent the tests specified in ANSI Standard Z21.10.3. 2B. Starting the System After Extended Shut-Down 1. 2. Hydrogen gas can be produced in a hot water system that has not been used for a long period of time (usually two weeks or more.) Hydrogen gas is extremely flammable.
LAARS Heating Systems Company Page 16 FOR YOUR SAFETY READ BEFORE OPERATING WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury, or loss of life. A. This appliance is equipped with an ignition device which automatically lights the pilot. Do not try to light the pilot by hand. B. BEFORE LIGHTING smell all around the appliance area for gas.
Mighty Stack Water Heater SECTION 3. Maintenance and Service WARNING Follow local regulations with respect to installation of carbon monoxide (CO) detectors. To reduce the risk of CO spillage, follow the maintenance schedule for the water heater. 3A. Regular Maintenance Do this immediately after installation • Inspect the external surfaces of the heat exchanger for fouling. This could indicate a problem with the supply of combustion air.
LAARS Heating Systems Company Page 18 5. The pilot and main burners will then light, but only if these conditions are satisfied: • Aquastat closed – indicates the tank temperature is below the set-point. • High limit switch closed – indicates the water temperature in the heater is below the high limit set-point. If all of these conditions are satisfied, the inducer motor relay turns on the inducer fan. 6. The pressure switch closes, indicating that the inducer fan is running.
Mighty Stack Water Heater Turn gas supply off. Set aquastat to call for heat. Is gas valve powered? (Should be 24V AC) Page 19 NO YES Does igniter warm up and glow red? NO YES Check: • On/Off toggle switch • Line voltage/power • Low voltage transformer • Limit controller • Aquastat • Wiring • Fan proving switch on combustion air blower • Roll-out switch (inside cabinet) Unplug igniter, measure voltage at two bottom terminals of gas valve. Is this 24V AC? YES Replace igniter.
Page 20 3G. Parts Listing Figure 18. General View Showing Major Assemblies/Components.
Mighty Stack Water Heater 19 18 17 16 15 14 13 12 11 Part No. T2008400 T2008300 T2008500 20425802 20442100 20442000 20441800 20441700 20441600 Description Tile, Rear Tile, Side, Left and Right Tile, Front Heat Shield Bracket, Flue Collector / Heat Exchanger Baffle Retainer / Refractory Cover Rail, Support, Outside Right Panel Rail, Support, Right Rail, Support, Left Figure 19. Heater Cabinet Components. Page 21 10 9 8 7 6 5 4 3 2 1 Part No.
LAARS Heating Systems Company Page 22 Figure 20. Electrical/Control Components. 7 6 Part No.
Mighty Stack Water Heater Figure 21. Plumbing/Piping and Pumps. Page 23 9 8 Part No.
LAARS Heating Systems Company Page 24 17 16 15 14 13 12 Part No. P2032500 A2003300 S2006700 A2003200 A2086100 A2078600 Description Drain Boiler Brz 1/2" NPT Temp / Press Relief Valve Gasket, Water Tank “Clean Out” Anode, Water Tank Tank, 80 Gallon Handle, Access Figure 22. Tank and Tank Cabinet. 11 10 9 8 7 6 5 4 3 2 1 Part No.
Mighty Stack Water Heater Page 25 7 7 7 7 7 7 7 6 6 5 5 4 3 2 1 Figure 23. Burner Tray Assembly. Part No.
LAARS Heating Systems Company Page 26 Figure 24. Flue Collector Assembly. 4 3 2 Part No. 20425402 A2000200 20404608 2 2 1 20404612 20404607 20430602 Description Outlet Flue Collar Induced Draft Blower NAT. 5001-10000 FT. Blower Orifice Plate & LP 5001-10000 FT. Blower Orifice Plate LP 0-5000 FT. Blower Orifice Plate NAT. 0-5000 FT.
Mighty Stack Water Heater Page 27 *NOTE: Item 1 includes item 2 through item 6 6 5 4 3 2 1 Figure 25. Heat Exchanger. Part No.
H2022800D 800.900.9276 • Fax 800.559.1583 (Customer Service, Service Advisors) 20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355 1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130 www.Laars.com Litho in U.S.A.
