LAARS Mighty Max VW (Sizes 320M - 400M) - Installation, Operation and Maintenance Instructions - Manual (Page 2)

Page 2
LAARS Heating Systems
TABLE OF CONTENTS
SECTION 1.
General Information
1.1 Introduction ................................................... 3
1.2 Warranty ....................................................... 3
1.3 Technical Assistance .................................... 3
SECTION 2.
Installation Instructions
2.1 General Information ...................................... 3
2.2 Heater Placement ......................................... 4
2.3 Installation of Outdoor Heaters ..................... 4
2.4 Freeze Protection ......................................... 4
2.5 Installation of Indoor Water Heaters ............. 4
2.6 Gas Supply and Piping ................................. 5
2.7 Water System Piping .................................... 6
2.7.1 Water Chemistry ........................................... 6
2.7.2 Water Piping ................................................. 6
2.7.3 Pressure Buildup in Water System ............... 7
2.7.4 Temperature and Pressure Relief Valve ...... 7
2.7.5 Pump Requirements ..................................... 7
2.7.6 Combined Space Heating/Potable
Water Heating Systems ................................ 8
2.8 Venting and Combustion Air Information ...... 9
2.9 Top-to-Rear Vent Collar Conversion ............ 9
2.10 Venting ......................................................... 9
2.10.1 Vertical Venting - Category I......................... 9
2.10.2 Vertical Venting - Non Category I ................. 9
2.10.3 Horizontal Venting - Non Category I ........... 10
2.10.4 Side Wall Vent Terminal ............................. 10
2.11
Air for Combustion and Ventilation ............. 13
2.11.1 Air From Room ........................................... 13
2.11.2 Ducted Combustion Air .............................. 14
2.11.3 Conversion for Ducted Combustion Air ...... 14
2.11.4 Combustion Air Piping ................................ 14
2.12
Electrical Wiring .......................................... 15
SECTION 3.
Operation
3.1 Start Up Requirements ............................... 17
3.2 Hi-Limit Checkout ....................................... 18
3.3 Venturi and Gas Pressure
Regulator System ....................................... 18
3.3.1 Overall Operation ....................................... 18
3.4 To Start Up System .................................... 18
3.4.1 Setting Temperature Controls .................... 19
3.5 To Shut Down System ................................ 19
3.6 Venturi Adjustment - Natural Gas ............... 19
3.6.1 Pressure Measurement Port ...................... 19
3.6.2 Adjustment Procedure - Natural Gas .......... 19
3.6.3 Venturi Setup Procedure - Natural Gas ...... 21
3.7 Venturi Adjustment - Propane Gas ............. 21
SECTION 4.
Maintenance
4.1 General Instructions ................................... 22
4.2 Heater Exchanger ...................................... 22
4.2.1 Inspection of the Heat Exchanger .............. 23
4.2.1a External Heat Exchanger Inspection .......... 23
4.2.1b Internal Heat Exchanger Inspection ........... 23
4.2.1c Cleaning the Heat Exchanger - External .... 23
4.2.1d Cleaning the Heat Exchanger - Internal ..... 24
4.3
Gas and Electric Controls ........................... 24
4.4 Filter ........................................................... 24
4.4.1 Filter Function ............................................. 24
4.4.2 Filter Service .............................................. 24
SECTION 5.
Troubleshooting
5.1 Sequence of Operation .............................. 24
5.2 Venturi and Gas Pressure Regulator
System ....................................................... 26
5.3 Electrical Components ............................... 26
5.3.1 General Troubleshooting ............................ 26
5.3.2 Electrical Troubleshooting .......................... 27
SECTION 6.
Parts List for Mighty Max VW Heater
6.1 General Information .................................... 27
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PRODUCTION