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Installation and Operation Instructions
Installation and Operation
Instructions for
Mighty Therm
These instructions are to be stored in the pocket provided on the boiler.
FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,
qualified in hot water heater installation and maintenance. Improper installation and/or operation could
create carbon monoxide gas in flue gases which could cause serious injury, property damage, or death.
Improper installation and/or operation will void the warranty.
If the information in this manual is not followed exactly, a fire or explosion may result
causing property damage, personal injury or loss of life.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or
any other appliance.
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Immediately call your gas supplier from a nearby phone. Follow the gas supplier's
instructions.
• If you cannot reach your gas supplier, call the fire department.
Installation and service must be performed by a qualified installer, service agency, or gas
supplier.
Volume Water Heaters
Models VW, PW and IW
Sizes 500-1825
WARNING
WHAT TO DO IF YOU SMELL GAS
Document 2040D
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Summary of Contents for Laars IW
- Page 1 FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician, qualified in hot water heater installation and maintenance. Improper installation and/or operation could create carbon monoxide gas in flue gases which could cause serious injury, property damage, or death.
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Page 2: Table Of Contents
Page 2 SECTION 1. General Information Introduction... 3 Heater Identification ... 3 Flow Requirements ... 4 Water Chemistry ... 4 SECTION 2. Installation Heater Placement ... 4 Installation of Indoor Heaters ... 4 2B-1. Combustion Air Supply ... 6 2B-2. Venting ... -
Page 3: General Information
*Model PW water heaters are basically the same as the VW series except that the PW heaters come with integrally mount pumps. *Model IW water heaters are tankless instantaneous heaters, complete with mount pump for use in applications having a suitable diversity in heater load. -
Page 4: Flow Requirements
2, 3, 4 and 5 show common installation on combustible flooring. 2B. Installation of Indoor Heaters Locate the water heater to provide adequate clearance for inspection and service on all sides (see Table I). We recommend minimums of 24" from front (for proper access to and service of controls) and 18"... - Page 5 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 Water of a water heater is a restricted section 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0...
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Page 6: 1. Combustion Air Supply
IMPORTANT: In beauty shops, barber shops, cleaning establishments and self-service laundries with dry cleaning equipment, it is important that the water heater be installed in a location where Heater Each Opening* Model (Square Inches) -
Page 7: Installation Of Outdoor Heaters
Mighty Therm Volume Water Heater maintain clearances and prevent physical damage and separation of joints. Avoid ending heater vents near air conditioning or air supply fans. The fans can pick up exhaust flue products from the heater and return them inside the building, creating a possible health hazard. -
Page 8: Electrical Wiring
Page 8 Figure 8. T-Fitting Sediment Trap Installation. The boiler and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/2 psig. The boiler must be isolated from the gas supply piping system by closing its individual manual gas shutoff valve during any pressure testing of the gas supply... -
Page 9: Water Expansion
Mighty Therm Volume Water Heater Figure 9. Pressure Relief Valve Location. Special attention must be given to relief valve settings in installations where the heater is located on the ground floor of a tall building. The static pressure of the system is elevated and could cause the relief valve to leak. -
Page 10: Pump Performance And Installation
The Model IW heater is designed for use in a system without a hot water storage tank. The hot water supply line to usage point must have a return leg to the heater (see Figure 13, 14 and 15). - Page 11 Mighty Therm Volume Water Heater With Horizontal Tank NOTES: Heavy line indicates Heater to Tank Circulating Loop. Figure 11. Hot Water Supply System (Model VW & PW). Page 11 With Vertical Tank...
- Page 12 2. Pipe size and length must conform to the recommendations for each heater model. 3. A loop circulator is required to maintain forced circulation in the building hot water piping system. Figure 13. Split System Piping Diagram, Model IW. LAARS HEATING SYSTEMS...
- Page 13 1. All water connections 2" N.P.T. models. 2. Drain valve per ASME requirements. 3. A loop circulator is required to maintain forced circulation in the building hot water piping system. Figure 14. Dual Installation Piping Diagram, Model IW. NOTES: 1. All water connections 2" N.P.T. models.
- Page 14 Page 14 Figure 16. Two-Temperature Hot Water Supply System (Model VW or PW). LAARS HEATING SYSTEMS With Horizontal Tank Legend B - Check Valve in Hot Water Supply to Tempering Valve C - Check Valve in Return Line from Building Loop D - Tempering Valve E - Venturi (Suction) Tee H - Throttling Valves in Building Loop...
- Page 15 Mighty Therm Volume Water Heater Legend B - Check Valve C - Check Valve D - Tempering Valve H - Throttling Valves in Building Loop Returns J - Circulating Pump for Return Loop K - Service Valves to Isolate Heater and Pump for Service Figure 17.
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Page 16: Water Pressure
Model IW should be closed until the water pressure has been restored and the lines bled of accumulated air. If the heater fails to fire when it is turned back on, it may be airlocked. -
Page 17: Initial Start-Up
Standard on all models: Models VW and PW, the switch is mounted in the outlet “tee” connection. Model IW, the switch is mounted directly in the header outlet. The flow switch shuts down all burners in case of low water condition or pump failure. -
Page 18: To Start Up System
Page 18 gas supply, the automatic safety shutoff devices must be checked. Before beginning the tests, make sure the main manual gas valve, and any other heater firing valves are in the “OFF” position. Make sure the heater’s power switch is in the “ON”... -
Page 19: To Turn Off Heater
Mighty Therm Volume Water Heater depressed for one minute then release. Once the pilot is lit, the power is supplied through the aquastat to the main gas valve. 2. To set the temperature and high-limit controls: When using a tank aquastat: Set the tank aquastat to the desired tank temperature. -
Page 20: Troubleshooting And Analysis Of Service Problems
Page 20 Lower the front of the burner (to avoid damaging pilot shield) then remove the burner tray. Caution Black carbon or green soot on a dirty heat exchanger can, under certain conditions, be ignited by a random spark or open flame. To prevent this unlikely occurrence, dampen the soot deposits with wet brush or fine water spray before servicing or cleaning the heat... - Page 21 Mighty Therm Volume Water Heater II. HEATER IS POUNDING, KNOCKING OR EMITTING STEAM FROM RELIEF VALVES. Possible Cause A. Low or no water flow. A. This condition is usually caused by lack of adequate water flow through heater. Check the following: 1.
- Page 22 LAARS HEATING SYSTEMS Page 22 SECTION 6. Parts Descriptions and Order Numbers...
- Page 23 Mighty Therm Volume Water Heater Figure 22. Parts Identification. Page 23 NOTE: Temperature Control Wells - Inlet/Outlet Header 1. Firing Mode L, K, & C - 2 Dry Wells 2. Firing Mode H A. Natural Gas Boilers & Heaters 500 thru 850 - 2 Dry Wells...
- Page 24 LAARS HEATING SYSTEMS Page 24...
- Page 25 Mighty Therm Volume Water Heater Page 25 Figure 23. Tile Assemblies.
- Page 26 LAARS HEATING SYSTEMS Page 26...
- Page 27 Mighty Therm Volume Water Heater Page 27...
- Page 28 LAARS HEATING SYSTEMS Page 28...
- Page 29 Mighty Therm Volume Water Heater Page 29 Figure 21. Outdoor Parts.
- Page 30 LAARS HEATING SYSTEMS Page 30 SECTION 7. Outdoor Parts Descriptions and Order Numbers...
- Page 31 Mighty Therm Volume Water Heater Page 31...
- Page 32 SECTION 8. Optional Parts Descriptions and Order Numbers Pump Rotating Sections and Repair Parts Check pump assembly on heater for H.P. rating and find correct Laars part number from table below. Description Pump Rotating Assembly, B&G, 1522 w/3 “ IMP, Bronze, 1P Pump Rotating Assembly, B&G, Series 90 w/3 “...
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