Laars Mighty Therm2 MT2V (Sizes 200, 300, 400) - Install User Manual

WARNINGIf the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of

LAARS Heating SystemsPage 10 WARNINGOperation of appliances with a blocked common vent may lead to serious injury or death. Safetydevices must be im

Mighty Therm2 (200, 300, 400)Page 11 U.S. Installations (see note 1) Canadian Installations (see note 2)A= Clearance above grade, veranda, porch,

LAARS Heating SystemsPage 12gravity inlets or other openings. Whenever possible, locations under windows or near doors should be avoided.4. Locate

Mighty Therm2 (200, 300, 400)Page 132. Product Approved side wall horizontal vented gas fueled equipment installed in a room or structure separate f

LAARS Heating SystemsPage 14spaces of the building. Turn on clothes dryers and any appliance not connected to the common venting system. Turn on any

Mighty Therm2 (200, 300, 400)Page 15Model (Size) Outdoor Vent and Air Terminal Kit200 CA003001300 CA003002400 CA003003Table 6. Vent / Air Kits for O

LAARS Heating SystemsPage 16NOTE: The Mighty Therm2 appliance and all other gas appliances sharing the gas supply line must be firing at maximum cap

Mighty Therm2 (200, 300, 400)Page 17Model (Size)20°F 25°F 30°F 35°Fflow gpmH/L feetflow gpmH/L feetflow gpmH/L feetflow gpmH/L feet200 17 1.6 14 1.0

LAARS Heating SystemsPage 18Figure 5. Hydronic Piping — Multiple Boilers, Low Temperature System.Figure 6. Hydronic Piping — One Boiler, Multi-Tempe

Mighty Therm2 (200, 300, 400)Page 19Figure 7. Hydronic Piping — Primary-Secondary, Reverse-Return.Figure 8. Hydronic Piping — Primary-Secondary, Reve

LAARS Heating SystemsPage 2SECTION 1. General Information1.1 Introduction ... 31.2 Model Identi

LAARS Heating SystemsPage 20SECTION 4B.Water Connections — Mighty Therm2 Water Heater4B.1 Water System Piping — Water HeaterHot water piping sho

Mighty Therm2 (200, 300, 400)Page 21When the system requires water for heating at temperatures higher than required for other uses, an anti-scald mix

LAARS Heating SystemsPage 22Figure 9. Water Heater Piping — One Heater, One Tank.NOTES:5. CAUTION: PUMP SIZING MUST BE BASED UPON WATER HARDNESS ATJ

Mighty Therm2 (200, 300, 400)Page 23Figure 11. Water Heater Piping — One Heater, Multiple Tanks.CAUTION: THIS DRAWING SHOWS SUGGESTEDPIPING CONFIGURA

LAARS Heating SystemsPage 24Figure 15. Wiring Diagram, Boiler or Water Heater.-+ST.16VPUMPSTATUSSWITCHST.26V+-NOCNC1PSENSORP212BLYYYRNOCTB1L1PUMPPUM

Mighty Therm2 (200, 300, 400)Page 25STAGE 2STAGE 1CTLBDGASVALVEGASVALVEIGN CTLVALFLOWSWPRSWBURNERIGN CTLPSWIGN CTLTHCNTRLBDFIELDINTERLOCKTTCNTRLBD24C

LAARS Heating SystemsPage 26 SECTION 6.Operating Instructions6.1 Filling the Boiler System1. Ensure the system is fully connected. Close all bleed

Mighty Therm2 (200, 300, 400)Page 27LEDs State Description1. Power2. Heat – On = call for heat; Flashes for Boiler sensor error3. DHW – On = call for

LAARS Heating SystemsPage 28differential/2.2. Target Max - The boiler target maximum is the point at which the stages will start to turn off to main

Mighty Therm2 (200, 300, 400)Page 29blower off.6.6 Operating the Burner and Set-Up6.6.1 Set-Up for 0 to 2500 Feet AltitudeThe setup must be checked

Mighty Therm2 (200, 300, 400)Page 3SECTION 1.General InformationUSING THIS MANUAL – Because the Mighty Therm2 Boilers and Mighty Therm2 Water Heaters

LAARS Heating SystemsPage 30SECTION 7.Maintenance7.1 System Maintenance1. Lubricate the system water-circulating pump, if required, per the instru

Mighty Therm2 (200, 300, 400)Page 31 h. Pump (if required) i. Relays j. Flow switch k. Gas train l. Control components7.2.1 BurnersClose ma

LAARS Heating SystemsPage 32off the 120-volt power to the appliance. Isolate the boiler or water heater from the system by closing the isolation val

Mighty Therm2 (200, 300, 400)Page 33SECTION 8.Trouble Shooting8.1 Resolving LockoutsThere are many causes of lockouts. The three most common causes

LAARS Heating SystemsPage 34Item Description Model 200 Model 300 Model 400COMBUSTION CHAMBER COMPONENTSSeeFigure201 Base Assembly 2C1000 3C1000 4C

Mighty Therm2 (200, 300, 400)Page 35JACKET COMPONENTSSeeFigure2140 Panel, Front, Jacket R2C3320 R3C3320 R4C332041 Panel, Rear, Jacket 2C3220 3C3220

LAARS Heating SystemsPage 36GAS TRAIN COMPONENTSSeeFigure2380 Weldment, Gas Manifold, Main L0063702 L0063703 L006370481 Manifold, Gas, On/Off L006

Mighty Therm2 (200, 300, 400)Page 3712345678910111213141516171819222324252627282930313131313132202119Figure 20. Combustion Chamber Components.

LAARS Heating SystemsPage 38Figure 21. Jacket Components.4041424851434445464749505253545455

Mighty Therm2 (200, 300, 400)Page 396062636364647365666770687269B69A6171Figure 22. Heat Exchanger Components.

LAARS Heating SystemsPage 41.2 Model IdenticationConsult the rating plate on the unit. The following information describes the model number struct

LAARS Heating SystemsPage 4080818584848687ON/OFF8082838586862STAGEFigure 23. Gas Train Components.

Mighty Therm2 (200, 300, 400)Page 4110210410697Figure 24. Control Panel Components.

LAARS Heating SystemsPage 42H2358000A800.900.9276 • Fax 800.559.1583 (CustomerService,ServiceAdvisors)20 Industrial Way, Rochester, NH 03867 • 60

Mighty Therm2 (200, 300, 400)Page 5Figure 1A. Dimensional Data - Non Pump Mounted.*Air and vent connections may be on top or back of the Mighty Therm

LAARS Heating SystemsPage 6Figure 1b. Dimensional Data - Pump Mounted.*Air and vent connections may be on top or back of the Mighty Therm2, and are

Mighty Therm2 (200, 300, 400)Page 7control replacement, etc.). When vented vertically, the Mighty Therm2 must be located as close as practical to a c

LAARS Heating SystemsPage 8SECTION 2. Venting and Combustion Air WARNINGFor indoor installations, as an additional measure of safety, National Combu

Mighty Therm2 (200, 300, 400)Page 92.1.2 Intake Combustion AirThe combustion air can be taken through the wall, or through the roof. When taken from