Laars Mighty Stack MS-080, Operating Instructions Manual

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Laars Heating Systems
Page 2
SECTION 1.
General Information
1.1 Introduction ...................................................... 3
1.2 Model Identification .......................................... 4
1.3 Warranty .......................................................... 4
1.4 Dimensions ...................................................... 4
1.5 Locating the Appliance..................................... 4
1.6 Locating Appliance for Correct Horizontal Vent/
Ducted Air Distance From Outside Wall .......... 6
SECTION 2.
Venting and Combustion Air
2.1 Combustion Air ................................................ 7
2.1.1 Combustion Air From Room ............................ 7
2.1.2 Intake Combustion Air...................................... 8
2.2 Venting ............................................................. 8
2.2.1 Vent Categories ............................................... 8
2.2.2 Category I Vent ................................................ 8
2.2.3 Common Venting Systems .............................. 8
2.2.4 Category III Vent .............................................. 9
2.3 Locating Vent & Combustion Air Terminals ...... 9
2.3.1 Side Wall Vent Terminal ................................... 9
2.3.2 Side Wall Combustion Air Terminal ................ 12
2.3.3 Vertical Vent Terminal .................................... 12
2.3.4 Vertical Combustion Air Terminal ................... 12
2.4 Common Vent Test ........................................ 12
2.5 Vent Terminals for Outdoor Units ................... 13
SECTION 3.
Gas Supply and Piping
3.1 Gas Supply and Piping .................................. 15
SECTION 4.
Water Connections
4.1 Water System Piping ..................................... 16
4.2 Hot Water Supply Piping ................................ 16
4.3 Water Flow Requirements ............................. 16
4.4 Combined Water Heating (potable)
and Space Heating ........................................ 16
4.5 Freeze Protection .......................................... 16
SECTION 5.
Electrical Connections
5.1 Main Power .................................................... 18
5.2 Field Wiring ................................................... 18
SECTION 6.
Operating Instructions
6.1 Filling the Water Heater System .................... 20
6.2 Operating Temperature Control ..................... 20
6.3 External Water Heater Operations ................. 20
6.4 Sequence of Operation .................................. 20
6.5 Ignition Control Reaction to Air Flow/
Blocked Vent Pressure Switch ....................... 20
6.6 Operating the Burner and Set-Up .................. 21
6.6.1 Set-Up for 0 to 2500 Feet Altitude ................. 21
6.6.2 High Altitude Adjustment and Set-Up............. 22
6.7 Shutting Down the Mighty Stack .................... 22
6.8 To Restart the Mighty Stack ........................... 22
SECTION 7.
Maintenance
7.1 System Maintenance ..................................... 23
7.2 Appliance Maintenance and
Component Description ................................. 23
7.2.1 Burners .......................................................... 23
7.2.2 Filter ............................................................... 23
7.2.3 Gas Valve ...................................................... 23
7.2.4 Manual Reset High Limit Control ................... 24
7.2.5 Ignition Control............................................... 24
7.2.6 Ignitor ............................................................. 24
7.2.7 Transformer ................................................... 24
7.2.8 Flow Switch .................................................... 24
7.2.9 Heat Exchanger Coil ...................................... 24
SECTION 8.
Trouble Shooting
8.1 Resolving Lockouts........................................ 26
8.2 Delayed Ignition – Possible Causes .............. 26
8.3 High Gas Consumption.................................. 26
SECTION 9.
Replacement Parts
9.1 General Information ....................................... 27
9.2 Parts List ........................................................ 27
TABLE OF CONTENTS