Laars Mighty Therm 2 MT2H Installation And Operation Instructions Manual Download Page 36

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LAARS Heating Systems

Page 36

GAS TRAIN COMPONENTS

See Figure 23

Weldment, Gas Manifold, Main

L0063702

L0063703

L0063704

Manifold, Gas, On/Off

L0063414

L0063416

L0063418

Manifold, Gas, 2 Stage Left Bank

L0063404

L0063413

L0063414

Manifold, Gas, 2 Stage Right Bank

L0063402

L0063403

L0063405

Orifice, Nat. Gas

L0062900

Orifice, LP Gas

L0063000

Spacer, Gas Orifice

F2022400

Gas Valve, Combination, Nat. (DSI) 3/4" NPT x

3/4" NPT

V0079400

Gas Valve, Combination, LP (DSI) 3/4" NPT x

3/4" NPT

V0079500

Cover, Gas Inlet, Air Box

2C2018

Item

Description

Model 200

Model 300

Model 400

CONTROL PANEL COMPONENTS

See Figure 24

Bracket, Mounting, Hi-Limt/Pressure Switch

2C7004

Switch, Pressure, Diaphragm, SPST

E0255500

Switch, Pressure, Diaphragm, SPDT

RE0240900

Switch, Limit, High Temperature, Hydronic

E2304800

Switch, Limit, High Temperature, Volume Water

E2324200

Transformer, 24, 120 V, 50VAC

E0180500

PCB, TCM

MT2H

MT2V

RE2344300

RE2344301

Switch, Toggle, SPDT

R2007700

Tray, Control Panel

2F7001

3F7001

4F7001

101

Relay, 24VAC, DPDT

E2327800

102

Ignition Control

E0253400

103

Switch, Rocker, 15A, 125 VAC, 1/2 HP

RE2322700

104

Terminal Block

E2327700

105

Cover, Transformer

2C7005

106

Label, Terminal Block

H2356600

108

Stablilzer, Control Panel

2C7006

not shown

Harness, Main

E2348700

Item

Description

Model 200

Model 300

Model 400

Summary of Contents for Mighty Therm 2 MT2H

Page 1: ...r installation and or operation will void the warranty For indoor installations as an additional measure of safety Laars strongly recommends installation of suitable Carbon Monoxide detectors in the v...

Page 2: ...16 SECTION 4B Water Connections Water Heater 4B 1 Water System Piping Water Heater 20 4B 2 Hot Water Supply Piping Water Heater 20 4B 3 Water Flow Requirements Water Heater 20 4B 4 Combined Water pota...

Page 3: ...da the Canadian Electrical Code Part 1 CSA STD C22 1 and all applicable local codes as required by the AHJ This appliance must be electrically grounded in accordance with the applicable codes and stan...

Page 4: ...e installer Shipping costs are not included in the warranty coverage Some accessory items are shipped in separate packages Verify receipt of all packages listed on the packing slip Inspect everything...

Page 5: ...ions may be on top or back of the Mighty Therm2 and are field convertible Model A Combustion Air Connection B Vent Connection C Horizontal Cat III Vent Pipe Size in cm in cm in cm in cm 200 20 5 52 4...

Page 6: ...may be on top or back of the Mighty Therm2 and are field convertible Model A Combustion Air Connection B Vent Connection C Horizontal Cat III Vent Pipe Size in cm in cm in cm in cm 200 20 5 52 4 10 5...

Page 7: ...Material Recommended Service Access Clearance inches cm inches cm Left Side 1 2 5 24 61 Right Side 1 2 5 24 61 Top 1 2 5 12 30 Back 1 2 5 12 30 Front 1 2 5 36 91 Vertical Category 1 Vent 6 15 2 Horiz...

Page 8: ...e outdoors or when communicating to the outdoors through vertical ducts each opening shall have a minimum free area of 1 square inch per 4000 Btu hr 5 5 square cm kW of total input rating of all equip...

Page 9: ...ting it may be considered a Category I or a Category III appliance In general a vertical vent system will be a Category I system However in rare instances a Mighty Therm2 s vertical vent system may be...

Page 10: ...perating instructions on all appliances to be common vented for instructions warnings restrictions and safety requirements If safe operation of all appliances connected to a common vent cannot be assu...

Page 11: ...to non mechanical air supply Direct Vent Only 12 inches 30 cm inlet to building or the combustion air inlet Other Than Direct Vent 4 feet 1 2 m below or 36 inches 91 cm to any other appliance to side...

Page 12: ...addition the installing plumber or gasfitter shall observe that a battery operated or hard wired carbon monoxide detector with an alarm is installed on each additional level of the dwelling building o...

Page 13: ...combustion air terminal so that it cannot be blocked by snow The National Fuel Gas Code requires that it be at least 12 inches 30 cm above grade but the installer may determine it should be higher dep...

Page 14: ...tes et les fen tres du b timent et toutes les portes entre l espace o les appareils toujours raccord s au syst me d vacuation sont install s et les autres espaces du b timent Mettre en marche les s ch...

Page 15: ...sediment trap must be provided upstream of the gas controls 7 All threaded joints should be coated with piping compound resistant to action of liquefied petroleum gas 8 The appliance and its individu...

Page 16: ...coils located in air handling appliances where they may be exposed to refrigerated air circulation must be equipped with flow control valves or other automatic means to prevent gravity circulation of...

Page 17: ...minute H L head loss ft head loss in feet m head loss in meters Maximum temperature rise is 35 F 19 C as shown Head loss is for boiler s heat exchanger only N R not recommended Table 8 Water Flow Requ...

Page 18: ...LAARS Heating Systems Page 18 Figure 5 Hydronic Piping Multiple Boilers Low Temperature System Figure 6 Hydronic Piping One Boiler Multi Temperature System...

Page 19: ...Mighty Therm2 200 300 400 Page 19 Figure 7 Hydronic Piping Primary Secondary Reverse Return Figure 8 Hydronic Piping Primary Secondary Reverse Return Low Temperature...

Page 20: ...Gas Shutoff Devices for Hot Water Supply Systems ANSI Z21 22 CSA 4 4 of suitable discharge capacity must be installed in the separate storage tank system If the Mighty Therm2 water heater is installed...

Page 21: ...or the water is not able to circulate there is a risk of freezing in the heater or in the pipes in the system When water freezes it expands This can result in bursting of pipes in the system or damag...

Page 22: ...SOFT N NORMAL H HARD 1 THROUGH 7 5 7 6 THROUGH 17 OVER 17 2 3 4 Figure 10 Water Heater Piping Multiple Heaters One Tank SUPPLY RECIRC CWMU CAUTION THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AN...

Page 23: ...ANSION TANK 3 WAY VALVE VALVE PRESSURE REDUCING VALVE PUMP PRV TPRV Figure 12 Water Heater Piping Multiple Heaters Multiple Tanks CAUTION THIS DRAWING SHOWS SUGGESTED PIPING CONFIGURATION AND VALVING...

Page 24: ...BK BL Y R BL W Y BLK BL R W W Y BLK GY V BK GY BK GY BK V W V W BR R BR BK BR BLK BR BLK R BK R BK BR BK BR R Y R G G G G BK W W W POWER BK BK BK BK BK BK BK BK BL R BL R BK STAGE 2 GAS VALVE STAGE 1...

Page 25: ...ral wires are provided for connections inside the boiler jacket Ground wire can be connected to the grounding screw in the box Wiring diagrams are shown in Figures 15 16 5 2 Field Wiring Field Install...

Page 26: ...r insures that water is at the highest point in the circulating loop then the system is ready for operation 14 Refer to local codes and the make up water valve manufacturer s instructions as to whethe...

Page 27: ...DE MUST NOT BE USED UNLESS AT LEAST ONE OF THE FOLLOWING CONDITIONS IS TRUE An external energy management system is installed that reduces the boiler water temperature as the heating load decreases Th...

Page 28: ...ust plenum This switch opens if the pressure is excessive as an indicator of a blocked vent When these two pressure switches are closed voltage is sent to the PSW terminal on the ignition control whic...

Page 29: ...n the Burner Safety Shutoff Device must be tested To test a Close gas shutoff valve with burner operating b The flame will go out and blower will continue to run for the post purge cycle Three attempt...

Page 30: ...when servicing controls Wiring errors can cause improper and dangerous operation Verify proper operation after servicing Attention Lors d entretien ou de r paration des commandes tiquetez tous les c...

Page 31: ...le switch with a remote bulb type sensor Switches for water heaters and low temperature boiler models are set at 200 F Switches for standard boilers are set at 240 F The control is located behind the...

Page 32: ...with sufficient air for complete combustion and black carbon sooting is seldom experienced If sooting is suspected view ports for inspection of the heat exchanger are provided on the side of the boil...

Page 33: ...cling Boiler Boiler short cycling is caused when the load on the boiler system swings rapidly causing frequent cycling between call for heat and satisfied conditions This condition is greatly reduced...

Page 34: ...ent Flue 2C2300 2C2300 2C2300 18 Assembly Air Shutter Blower 2C5000 2C5000 2C5000 19 Assembly Filter Housing 2C3800 2C3800 2C3800 20 Media Filter R2073200 R2073200 R2073200 21 Clip Retaining Filter Me...

Page 35: ...r Copper R2C4100 R3C4100 R4C4100 Assembly Tube Heat Exchanger Copper Nickel R2C4120 R3C4120 R4C4120 61 Header Inlet Outlet 2F4122 2F4122 2F4122 62 Header Return 2C4103 2C4103 2C4103 63 Chamber Header...

Page 36: ...7004 2C7004 2C7004 93 Switch Pressure Diaphragm SPST E0255500 E0255500 E0255500 94 Switch Pressure Diaphragm SPDT RE0240900 RE0240900 RE0240900 95 Switch Limit High Temperature Hydronic E2304800 E2304...

Page 37: ...Mighty Therm2 200 300 400 Page 37 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 22 23 24 25 26 27 28 29 30 31 31 31 31 31 32 20 21 19 Figure 20 Combustion Chamber Components...

Page 38: ...LAARS Heating Systems Page 38 Figure 21 Jacket Components 40 41 42 48 51 43 44 45 46 47 49 50 52 53 54 54 55...

Page 39: ...Mighty Therm2 200 300 400 Page 39 60 62 63 63 64 64 73 65 66 67 70 68 72 69B 69A 61 71 Figure 22 Heat Exchanger Components...

Page 40: ...LAARS Heating Systems Page 40 80 81 85 84 84 86 87 ON OFF 80 82 83 85 86 86 2 STAGE Figure 23 Gas Train Components...

Page 41: ...Mighty Therm2 200 300 400 Page 41 102 104 106 97 Figure 24 Control Panel Components...

Page 42: ...hester NH 03867 603 335 6300 Fax 603 335 3355 1869 Sismet Road Mississauga Ontario Canada L4W 1W8 905 238 0100 Fax 905 366 0130 www Laars com Litho in U S A Laars Heating Systems 1209 Document 1231B D...

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