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Installation and Operation Instructions
Note: This document is to be used in conjunction with Document 1080, Installation and Operating
Instructions for Mini-Therm JVi boilers.
Improper installation, adjustment, alteration, service or maintenance can cause injury or property
damage. Refer to this manual. For assistance or additional information consult a qualified installer,
service agency, gas supplier, or call the factory.
Mini-Combo id
Residential Gas-Fired
Space/Water Heater
WARNING
Document 2101B
Installation
and Operation
Instructions for
Model MCH
Induced Draft
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Summary of Contents for Laars MCH
- Page 1 Installation and Operation Instructions Document 2101B Installation and Operation Instructions for Mini-Combo id Model MCH Induced Draft Residential Gas-Fired Space/Water Heater Note: This document is to be used in conjunction with Document 1080, Installation and Operating Instructions for Mini-Therm JVi boilers.
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Page 2: Table Of Contents
LAARS HEATING SYSTEMS Page 2 TABLE OF CONTENTS SECTION 1. SECTION 2. General Information Installation ..........Hazards and Your Safety — Location ............5 Hot Water Can Scald! ........3 Heater Placement ......... 5 Piping ............5 Wiring ............6... -
Page 3: General Information
Mini-Combo id Page 3 • Studies have indicated that dangerous bacteria SECTION 1. can form in potable water distribution system if General Information certain minimum water temperatures are not maintained. Contact local health department for more information. WARNING This manual supplies information on the application, SECTION 2. - Page 4 LAARS HEATING SYSTEMS Page 4 Boiler Flue Collar 4 (102) Check Valve Tank Pump 62.5 (1588) (1521) Tank Relief (19) Valve Domestic 41.5 Hot Water (1054) Outlet 32.5 (826) Tank Aquastat Cold Water (610) (610) Drain Inlet Valve (178) (178) Dimensions shown in inches (mm).
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Page 5: Heater Placement
(see Figure 4) to prevent normal thermal expansion from repeatedly forcing open the T&P relief valve. • T&P relief valve's discharge piping must be directed so that hot water flows away from all Figure 5. MCH Schematic. -
Page 6: Wiring
LAARS HEATING SYSTEMS Page 6 WALL TANK THERMOSTAT AQUASTAT TRANSFORMER (FIELD SUPPLIED) 115/60HZ 115V POWER SUPPLY NEUTRAL TERMINAL ZONE STRIP PUMP GROUNDING RELAY CONDUCTOR SENSOR HIGH AQUASTAT LIMIT (OPTIONAL) PUMP (FIELD SUPPLIED) PRESSURE BLACK TANK SWITCH WHITE PUMP TANK YELLOW... - Page 7 Mini-Combo id Page 7 115 Volts Supply Sequence of Operation Transformer Tank Stat (common) Domestic Demand Heating Demand (N.C.) (N.O.) Tank Pump Heating Pump (energized) (energized) High Limit Switch Inducer Energized Fan Proving Switch Flame Roll-Out Safety Switch Main Gas Valve (energized) Boiler On Figure 7.
- Page 8 LAARS HEATING SYSTEMS Page 8 Figure 8. Parts Identification.
- Page 9 Mini-Combo id Page 9 # Qty Part # Description 20085700 Weldment, Panel, Base 20085600 Weldment, Panel, Top 20086300 Weldment, Panel, Door 20086400 Panel, Side, Right 20127900 Weldment, Panel, Side, Left 20085900 Panel, Rear 20086500 Panel, Access 20084000 Bracket, Mounting, Left 20085400 Bracket, Support, Tank P2019200 Cross, Black Iron, 1¼"...
- Page 10 LAARS HEATING SYSTEMS Page 10...
- Page 11 Mini-Combo id Page 11...
- Page 12 6000 Condor Drive, Moorpark, CA 93021 • 805.529.2000 • FAX 805.529.5934 20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • FAX 603.335.3355 480 S. Service Road West, Oakville, Ontario, Canada L6K 2H4 • 905.844.8233 • FAX 905.844.2635 www.laars.com Litho in U.S.A. © Laars Heating Systems 0005 Document 2101B...