LAARS Mighty Therm HH-PH (Sizes 175-400) - Installation, Operation and Maintenance Instructions - Manual (Page 2)

LAARS HEATING SYSTEMS Page 2
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. Field Assembly ............................................. 4
2C. Site Location ................................................. 5
2C-1. Installation Information ................................. 5
2C-2. Outdoor Installation (U.S. Only) .................... 6
2C-3. Flooring - Typical Installation ........................ 6
2D. Combustion and Ventilation
Air Supply ..................................................... 7
2D-1. Outdoor Air Supply ....................................... 7
2D-2. Indoor Air Supply .......................................... 7
2D-3. Exhaust Fans or Vents ................................. 7
2E. Venting of Combustion Products .................. 7
2E-1. General Information ...................................... 7
2E-2. Replacement of Existing Boiler ..................... 8
2F. Water Flow System ...................................... 8
2F-1. Reversible Water Connections ..................... 8
2F-2. Freeze Protection ....................................... 11
2F-3. Pump Requirements ................................... 11
2F-4. Variable Water Flow Systems .................... 13
2F-5. System Pressure Requirements ................. 13
2F-6. Chilled Water Systems ............................... 15
2F-7. System to Boiler Piping .............................. 15
2F-8. Filling the System ....................................... 15
SF-9. Minimum Boiler Temperature ..................... 15
2G. Gas Supply and Piping ............................... 16
2G-1. General Instructions ................................... 16
2G-2. Special Precautions for Propane Gas ........ 16
2H.
Electrical Wiring .......................................... 19
SECTION 3.
Operating Instructions
3A. Setting the Temperature Controls .............. 19
3B. Start-Up Procedure .................................... 20
3C. Adjustment for Minimum Input Rate
(Models with Modulating Gas Valve) .......... 20
3D. Hi-Limit Switch Checkout ........................... 20
3E. Shut-Down Procedure ................................ 21
SECTION 4.
Service Instructions
4A. Regular Inspection ..................................... 21
4B. Replacement of Gas Controls .................... 21
SECTION 5.
Parts List for HH and PH Boilers
5A. General Information .................................... 22
5B. Parts List .................................................... 22