LAARS Mighty Therm LO-NOx PH (Sizes 250/400) - Install and Operating Manual - Manual (Page 2)

LAARS Heating Systems
Page 2
TABLE OF CONTENTS
SECTION 1.
General Information
1.1 Introduction .................................................... 3
1.2 Warranty ........................................................ 3
SECTION 2.
Installation Instructions
2.1 General Information ....................................... 5
2.2 Field Assembly .............................................. 5
2.3 Site Location .................................................. 7
2.3.1 Installation Information .................................. 7
2.3.2 Outdoor Installation ....................................... 8
2.3.3 Flooring - Typical Installation ......................... 8
2.4 Combustion and Ventilation Air Supply ......... 8
2.4.1 Outdoor Air Supply ........................................ 9
2.4.2 Indoor Air Supply ........................................... 9
2.4.3 Exhaust Fans or Vents .................................. 9
2.5 Venting (Category I) ...................................... 9
2.5.1 General Information ....................................... 9
2.5.2 Common Venting System2
Venting Multiple Appliances ........................ 10
2.5.3 Inspection of Commonly Vented
Appliances ................................................... 11
2.6 Water Flow System ..................................... 12
2.6.1 Freeze Protection ........................................ 12
2.6.2 Pump Requirements .................................... 12
2.6.3 Variable Water Flow Systems ..................... 13
2.6.4 System Pressure Requirements .................. 13
2.6.5 Chilled Water Systems ................................ 15
2.6.6 System to Boiler Piping ............................... 14
2.6.7 Filling the System ........................................ 15
2.6.8 Minimum Boiler Temperature ...................... 15
2.7 Gas Supply and Piping
(Natural Gas Only) ...................................... 15
2.7.1 General Instructions .................................... 15
2.8 Electrical Wiring ........................................... 16
SECTION 3.
Operating Instructions
3.1 Start-Up Procedure ..................................... 17
3.2. Setting the Temperature Controls ............... 17
3.3 Hi-Limit Switch Checkout ............................ 17
3.4 Shut-Down Procedure ................................. 17
SECTION 4.
Maintenance
4.1 General Instructions .................................... 24
4.2 Heat Exchanger ........................................... 24
4.2.1 Inspecting the Heat Exchanger ................... 24
4.2.2 Cleaning the Heat Exchanger ..................... 24
SECTION 5.
Troubleshooting and Service
5.1 Gas Pressure Tests ..................................... 25
5.1.1 Checking the Main Line Gas Pressure ........ 25
5.1.2 Checking the Manifold
Regulated Gas Pressure ............................. 26
5.2 Electrical Troubleshooting ........................... 26
5.2.1 Boiler Does Not Come On ........................... 26
5.2.2 Testing the Transformer .............................. 27
5.2.3 Testing the Electrical Power Supply ............ 27
5.2.4 Testing the Manual Reset
Hi-Limit Switch ............................................. 27
5.2.5 Testing the Flow Switch ............................... 27
5.2.6 Testing the Fusible Link
(flame roll-out switch) .................................. 28
5.2.7 Testing the Fuse .......................................... 28
5.2.8 Testing the Ignition Control .......................... 28
5.2.9 Combustion Air Blower ................................ 28
5.2.10 Boiler Will Not Shut Off ................................ 29
SECTION 6.
Replacement Parts
6.1 Ordering Information ................................... 29
6.2 Parts List ..................................................... 29
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