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Installation and Operation Instructions
Installation and Operation
Instructions for
Mighty Therm
Hydronic Boilers
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 boiler 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.
Models HH and PH
Sizes 500-1825
WARNING
WHAT TO DO IF YOU SMELL GAS
Document 1049E
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Summary of Contents for Laars Mighty Therm HH 500
- Page 1 Installation and Operation Instructions Document 1049E Installation and Operation Instructions for Mighty Therm Hydronic Boilers Models HH and PH Sizes 500-1825 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 boiler installation and maintenance.
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Page 2: Table Of Contents
LAARS Heating Systems Page 2 TABLE OF CONTENTS SECTION 1. SECTION 4. General Information Maintenance Introduction ........... 3 ..............14 Boiler Identification ........3 Flow Requirements ........3 SECTION 5. Variable Water Flow Systems ....... 4 Troubleshooting and Analysis of... -
Page 3: General Information
Laars Experience has shown that most problems are caused warranty. If field conditions require such by improper installation not system design. -
Page 4: Variable Water Flow Systems
This can result in an excessive proper application of staged or modulated firing water temperature rise and unstable boiler operation. systems. Consult the factory or local Laars If the system water flow is variable, it must not be representative for assistance with such systems. -
Page 5: Warning Regarding Chilled Water Systems
Mighty Therm Hydronic Boiler Page 5 Figure 2. Typical Schematic for a Primary-Secondary System. enough for the water to warm up to at least 70°F 1E. Warning Regarding Chilled (21°C) before the water is allowed to flow into the Water Systems boiler. -
Page 6: Installation
LAARS Heating Systems Page 6 2B-1. Combustion Air Supply SECTION 2. Installation The boiler location must provide sufficient air supply for proper combustion and ventilation of the surrounding area as outlined in the latest 2A. Boiler Placement edition of ANSI standard Z223.1 and/or in... - Page 7 Mighty Therm Hydronic Boiler Page 7 Figure 7. Typical Boiler Installation on Roof Using a 4 x 4 Stringer. Figure 4. Base for Combustible Floors. Figure 8. Installation on Concrete Blocks or Tile. Figure 5. Typical Boiler Installation on Concrete Slab. (b.) In Canada, consult local building and safety codes or, in the absence of such requirements, follow CGA requirements and/or CAN 1 - B149...
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Page 8: 2. Venting
When the installation of a draft fan is necessary the boiler from firing unless the blower is in connecting a venting system to a Laars boiler, operating. the installation should be engineered by... -
Page 9: Installation Of Outdoor Boilers
Verify that the boiler is fitted for the proper type using the appropriate tables in Appendix G of gas by checking the rating plate. Laars boilers in the National Fuel Gas Code, are normally equipped to operate below a 2000 ANSI Z223. -
Page 10: Electrical Wiring
LAARS Heating Systems Page 10 Distance from Gas Meter supply pressure. Low gas pressure could be an or Last Stage Regulator indication of an undersized gas meter and/or obstructed gas supply line. Size 0-100' 100-200' 200-300' (0-30.5m) (30.5-61m) (61-91.4m) The correct burner manifold gas pressure is stamped on the rating plate. -
Page 11: Water Piping Of System
Mighty Therm Hydronic Boiler Page 11 The pump and boiler must be electrically Check piping diagrams with local applicable interlocked so the boiler cannot come on unless plumbing, heating and building safety codes. the pump is running. A boiler installed above radiation level must be All field installed electrical safety devices and provided with a low water cutoff device either as all field installed devices (draft switches, relays,... -
Page 12: Operation
LAARS Heating Systems Page 12 13. Check gauge for correct water pressure and also Operating Controls: check water level in system. If the height Electrically Operating Controls: indicated above the boiler insures that water is at Single, two-stage, four-stage or modulating... -
Page 13: Initial Start-Up
Mighty Therm Hydronic Boiler Page 13 Flow Switch: interrupted. The signal interruption can be detected either with a test light or a voltmeter. The response Standard on all models: Models HH and time should never exceed one second. PH, the switch is mounted in the outlet “tee”... -
Page 14: To Turn Off Boiler
(NOTE: After greater than the specified minimum input rating installation and first start-up, check the heat as shown on the appliance rating plate. Laars’ exchanger for fouling after the following periods boilers use gas valves which are factory set to... - Page 15 Mighty Therm Hydronic Boiler Page 15 If cleaning is required, shut off all With a wire brush, remove soot and loose scale electrical and gas supply to the heater. from heat exchanger. Clean fallen debris from bottom of heater. Make sure burner ports are clear and pilot To expose the heat exchanger: assembly is free of debris.
- Page 16 LAARS Heating Systems Page 16 SECTION 5. 3. BOILER WILL NOT FIRE. Troubleshooting and Analysis of Possible Cause What To Do Service Problems A. Electric power is off. A. Check to see that main power For proper service and problem diagnosis of the switch is “ON.”...
- Page 17 Mighty Therm Hydronic Boiler Page 17 5. BOILER IS POUNDING, KNOCKING OR EMITTING 6. SOOT IN FLUEWAYS OR IN TUBES, STEAM FROM RELIEF VALVES. OR NOXIOUS FUMES INDICATIVE OF BAD COMBUSTION. Possible Cause What To Do Possible Cause What To Do A.
- Page 18 LAARS Heating Systems Page 18 SECTION 6. Parts Descriptions and Order Numbers...
- Page 19 Mighty Therm Hydronic Boiler Page 19 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 1010 thru 1430 - 3 Dry Wells 1670 thru 1825 - 4 Dry Wells B.
- Page 20 LAARS Heating Systems Page 20...
- Page 21 Mighty Therm Hydronic Boiler Page 21 Figure 20. Tile Assemblies.
- Page 22 LAARS Heating Systems Page 22...
- Page 23 Mighty Therm Hydronic Boiler Page 23...
- Page 24 LAARS Heating Systems Page 24...
- Page 25 Mighty Therm Hydronic Boiler Page 25 Figure 21. Outdoor Parts.
- Page 26 LAARS Heating Systems Page 26 SECTION 7. Outdoor Parts Descriptions and Order Numbers...
- Page 27 Mighty Therm Hydronic Boiler Page 27...
- Page 28 800.900.9276 • 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. © Laars Heating Systems 0805 Document 1049E...