LAARS Mighty Therm2 MT2V (Sizes 500–2000 MBTU/h) - 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 Model Identification ............................................. 3
1.3 Warranty ............................................................. 4
1.4 Dimensions ......................................................... 4
1.5 Locating the Appliance........................................ 4
1.6 Locating Pump-Mounted Water Heater
with Respect to Storage Tank(s) ......................... 4
1.7 Locating Pump-Mounted Boiler with Respect
to Return/Supply Header .................................... 5
1.8 Locating Appliance for Correct Horizontal Vent/ ...
Ducted Air Distance from Outside Wall ......................... 5
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......................................... 7
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 ................................................. 8
2.3
Locating Vent & Combustion Air Terminals ......... 9
2.3.1 Side Wall Vent Terminal ...................................... 9
2.3.2 Side Wall Combustion Air Terminal ..................... 9
2.3.3 Vertical Vent Terminal ......................................... 9
2.3.4 Vertical Combustion Air Terminal ...................... 11
2.4
Common Vent Test — Boilers ........................... 11
2.5 Vent Terminals for Outdoor Units ...................... 12
SECTION 3. Gas Supply and Piping
3.1 Gas Supply and Piping ..................................... 12
SECTION 4A. Water Connections — Boiler
4A.1 Heating System Piping:
Hot Supply Connections — Boiler .................... 13
4A.2 Cold Water Make-Up — Boiler ......................... 14
4A.3 Water Flow Requirements — Boiler ................. 14
4A.4 Freeze Protection — Boiler............................... 14
SECTION 4B. Water Connections —
Water Heaters
4B.1 Water System Piping — Water Heater ............. 14
4B.2 Hot Water Supply Piping — Water Heater ........ 15
4B.3 Water Flow Requirements — Water Heater ..... 15
4B.4 Combined Water Heating (potable)
and Space Heating — Water Heater ................ 15
4B.5 Freeze Protection – Water Heater .................... 15
SECTION 5. Electrical Connections
5.1 Main Power ....................................................... 21
5.1.1 Changing Single Circuit to Two Circuits ............ 21
5.2 Field Wiring ....................................................... 21
5.3
External Staging Control Wiring........................ 26
SECTION 6. Operating Instructions
6.1 Sequence of Operation ..................................... 26
6.2 Filling the Boiler System ................................... 27
6.3 Operating Temperature Control ........................ 27
6.4 External Boiler Operations ................................ 28
6.5 Limit Controls .................................................... 28
6.6 Operating the Burner and Set Up ..................... 28
6.6.1 Set Up for 0 to 2500 Feet Altitude..................... 28
6.6.2 High Altitude Adjustment and Set Up ................ 28
6.7
Shutting Down the Mighty Therm2 ................... 29
6.8 To Restart the Mighty Therm2 .......................... 29
SECTION 7. Maintenance
7.1 System Maintenance ........................................ 29
7.2 Appliance Maintenance and
Component Description .................................... 29
7.2.1 Burners ............................................................. 30
7.2.2 Filter .................................................................. 30
7.2.3 Gas Valves ........................................................ 30
7.2.4 Manual Reset High Limit Control ...................... 30
7.2.5 Temperature Control ......................................... 30
7.2.6 Ignition Controls ................................................ 30
7.2.7 Ignitors/Sensor.................................................. 30
7.2.8 Transformer ...................................................... 30
7.2.9 Blowers ............................................................. 31
7.2.10 Flow Switch ....................................................... 31
7.2.11 Heat Exchanger Coil ........................................ 31
SECTION 8. Trouble Shooting
8.1 Resolving Lockouts........................................... 31
8.2 Delayed Ignition — Possible Causes................ 32
8.3 Short Cycling — Boiler...................................... 32
8.4 Short Cycling — Water Heater ......................... 32
8.5 High Gas Consumption..................................... 32
SECTION 9. Replacement Parts
9.1 General Information .......................................... 32
9.2 Parts List . ......................................................... 32