Page 2
LAARS HEATING SYSTEMS
TABLE OF CONTENTS
SECTION 1.
General Information
1A.
Introduction ................................................... 3
1B.
Warranty ....................................................... 3
1C.
Technical Assistance .................................... 3
SECTION 2.
Installation Instructions
2A.
General Information ...................................... 4
2B.
Heater Placement ......................................... 4
2C.
Installation of Outdoor Heaters ..................... 4
2D.
Freeze Protection ......................................... 6
2E.
Installation of Indoor Water Heaters ............. 6
2F.
Gas Supply and Piping ................................. 6
2G.
Water System Piping .................................... 7
2G-1.
Water Chemistry ........................................... 7
2G-2.
Water Piping ................................................. 7
2G-3.
Pressure Buildup in Water System ............... 7
2G-4.
Temperature and Pressure Relief Valve ....... 7
2G-5.
Pump Requirements ..................................... 9
2G-6.
Combined Space Heating/Potable
Water Heating Systems ................................ 9
2H.
Venting and Combustion Air Information .... 10
2I.
Top-to-Rear Vent Collar Conversion ........... 10
2J.
Venting ....................................................... 10
2J-1.
Vertical Venting - Category I ....................... 10
2J-2.
Vertical Venting - Non Category I ................ 10
2J-3.
Horizontal Venting - Non Category I ............ 13
2J-4.
Side Wall Vent Terminal ............................. 13
2K.
Air for Combustion and Ventilation .............. 13
2K-1.
Air From Room ........................................... 13
2K-2.
Ducted Combustion Air ............................... 13
2K-3.
Conversion for Ducted Combustion Air ....... 14
2K-4.
Combustion Air Piping ................................ 15
2L.
Electrical Wiring .......................................... 15
SECTION 3.
Operation
3A.
Start Up Requirements ............................... 17
3B.
Hi-Limit Checkout ....................................... 17
3C.
Venturi and Gas Pressure
Regulator System ....................................... 17
3C-1.
Overall Operation ........................................ 17
3C-2.
Venturi Adjustment ..................................... 18
3D.
To Start Up System .................................... 19
3D-1.
Setting Temperature Controls ..................... 19
3E.
To Shut Down System ................................ 19
3F.
Venturi Combustion Flow System ............... 19
3F-1.
Pressure Measurements Ports ................... 20
3F-2.
Venturi Adjustment ..................................... 20
3F-3.
Venturi Setup Procedure ............................. 21
SECTION 4.
Maintenance
4A.
General Instructions .................................... 21
4B.
Heater Exchanger ....................................... 22
4B-1.
Inspection of the Heat Exchanger ............... 22
4B-1a. External Heat Exchanger Inspection ........... 22
4B-1b. Internal Heat Exchanger Inspection ............ 22
4B-2a. Cleaning the Heat Exchanger - External ..... 22
4B-2b. Cleaning the Heat Exchanger - Internal ...... 23
4C.
Gas and Electric Controls ........................... 23
4D.
Filter ........................................................... 23
4D-1.
Filter Function ............................................. 23
4D-2.
Filter Service ............................................... 23
SECTION 5.
Troubleshooting
5A.
Sequence of Operation ............................... 24
5B.
Venturi and Gas Pressure Regulator
System ....................................................... 24
5C.
Electrical Components ................................ 24
5C-1.
General Troubleshooting ............................ 24
5C-2.
Electrical Troubleshooting .......................... 26
SECTION 6.
Parts List for Mighty Max VW Heater
6A.
General Information .................................... 26
Summary of Contents for Mighty Max VW Series
Page 25: ...Mighty Max Volume Water Heater Page 25 Figure 19 Troubleshooting Chart...
Page 27: ...Mighty Max Volume Water Heater Page 27 Front View Right Side View...
Page 28: ...Page 28 LAARS HEATING SYSTEMS Front View Rear View Right Side View Left Side View...
