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.
Boiler Placement ........................................... 4
2C.
Installation of Outdoor Boilers ........................ 4
2D.
Freeze Protection .......................................... 4
2E.
Installation of Indoor Boilers ........................... 5
2E-1.
Combustion Air Supply and Ventilation .......... 5
2E-2.
Removal of Existing Boiler ............................. 5
2F.
Gas Supply and Piping .................................. 6
2G.
Water System Requirements ......................... 8
2G-1.
Flow Requirements ........................................ 8
2G-2.
Variable Water Flow Systems ........................ 8
2G-3.
System Pressure Requirements .................... 9
2G-4.
Hot/Chilled Water Systems ............................ 9
2G-5.
Combined Space Heating/Potable
Water Heating Systems ................................. 9
2H.
Piping of System to Boiler .............................. 9
2I.
Filling the System ........................................ 10
2J.
Venting and Combustion Air Information ..... 10
2K.
Top-to-Rear Vent Collar Conversion ............ 12
2L.
Venting ........................................................ 13
2L-1.
Vertical Venting - Category I ........................ 13
2L-2.
Vertical Venting - Non Category I ................. 13
2L-3.
Vertical Venting - Non Category 1 ................ 13
2L-4.
Side Wall Vent Terminal .............................. 14
2M.
Air for Combustion and Ventilation ............... 14
2M-1.
Air From Room ............................................ 15
2M-2.
Ducted Combustion Air ................................ 15
2M-3.
Conversion for Ducted
Combustion Air ............................................ 15
2M-4.
Combustion Air Piping ................................. 16
2N.
Electrical Wiring ........................................... 16
SECTION 3.
Operating Instructions
3A.
Start Up Requirements ................................ 16
3B.
Hi-Limit checkout ......................................... 18
3C.
Venturi and Gas Pressure
Regulator System ........................................ 18
3C-1.
Overall Operation ......................................... 18
3C-2.
Venturi Adjustment ...................................... 18
3D.
To Start Up System ..................................... 19
3D-1.
Setting Temperature Controls ...................... 20
3E.
To Shut Down System ................................. 20
3F.
Venturi Combustion Flow System ................ 20
3F-1.
Pressure Measurement Ports ...................... 20
3F-2.
Venturi Adjustment ...................................... 20
3F-3.
Venturi Setup Procedure .............................. 22
SECTION 4.
Maintenance
4A.
General Instructions ..................................... 22
4B.
Heat Exchanger ........................................... 22
4B-1.
Inspection of the Heat Exchanger ................ 23
4B-1a. External heat Exchanger Inspection ............ 23
4B-1b. Internal Heat Exchanger Inspection ............. 23
4B-2.
Cleaning the Heat Exchanger ...................... 23
4B-2a. Cleaning the Heat Exchanger - External ...... 23
4B-2b. Cleaning the Heat Exchanger - Internal ....... 23
4C.
Gas and Electric Controls ............................ 23
4D.
Filter ............................................................ 24
4D-1.
Filter Function .............................................. 24
4D-2.
Filter Service ................................................ 24
SECTION 5.
Troubleshooting
5A.
Sequence of Operation ................................ 24
5B.
Venturi and Gas Pressure
Regulator System ........................................ 26
5B-1.
Field Checkout ............................................. 26
5C.
Electrical Components ................................. 26
5C-1.
General Troubleshooting ............................. 26
5C-2.
Electrical Troubleshooting ........................... 26
SECTION 6.
Parts List for Mighty Max HH Boiler
6A.
General Information ..................................... 27
