Lennox International Inc Merit Series Gas Furnace installation instructions Fan + Fan Fan + Nat

Page 20

TABLE 5

Vent Connector Capacity

Type B Double−Wall Vents with Type B Double−Wall Connectors

Serving Two or More Category I Appliances

Vent

Connector

 

 

 

Vent and Connector Diameter − D (inches)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Height

Rise

 

3 Inch

 

4 Inch

 

5 Inch

 

6 Inch

 

 

 

 

 

 

 

 

 

 

 

 

H

R

 

 

 

Appliance Input Rating in Thousands of Btu Per Hour

 

 

 

(feet)

(feet)

 

 

 

 

 

 

 

 

 

 

 

 

MIN

 

MAX

MIN

 

MAX

MIN

 

MAX

MIN

 

MAX

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

22

 

37

35

 

66

46

 

106

58

 

164

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

2

23

 

41

37

 

75

48

 

121

60

 

183

 

3

24

 

44

38

 

81

49

 

132

62

 

199

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

22

 

40

35

 

72

49

 

114

64

 

176

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

2

23

 

44

36

 

80

51

 

128

66

 

195

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

24

 

47

37

 

87

53

 

139

67

 

210

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

22

 

43

34

 

78

49

 

123

65

 

189

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10

2

23

 

47

36

 

86

51

 

136

67

 

206

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

24

 

50

37

 

92

52

 

146

69

 

220

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

21

 

50

33

 

89

47

 

142

64

 

220

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15

2

22

 

53

35

 

96

49

 

153

66

 

235

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

24

 

55

36

 

102

51

 

163

68

 

248

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

21

 

54

33

 

99

46

 

157

62

 

246

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

2

22

 

57

34

 

105

48

 

167

64

 

259

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

23

 

60

35

 

110

50

 

176

66

 

271

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

20

 

62

31

 

113

45

 

181

60

 

288

 

 

 

 

 

 

 

 

 

 

 

 

 

 

30

2

21

 

64

33

 

118

47

 

190

62

 

299

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

22

 

66

34

 

123

48

 

198

64

 

309

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TABLE 6

Common Vent Capacity

Type B Double−Wall Vents with Type B Double−Wall Connectors

Serving Two or More Category I Appliances

Vent

 

 

Common Vent Diameter − D (inches)

 

 

 

 

 

 

 

 

 

 

Height

4 Inch

5 Inch

6 Inch

7 Inch

 

 

 

 

 

 

 

 

H

 

 

Appliance Input Rating in Thousands of Btu Per Hour

 

 

(feet)

 

 

 

 

 

 

 

 

FAN + FAN

FAN + NAT

FAN + FAN

FAN + NAT

FAN + FAN

FAN + NAT

FAN + FAN

FAN + NAT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

92

81

140

116

204

161

309

248

 

 

 

 

 

 

 

 

 

8

101

90

155

129

224

178

339

275

 

 

 

 

 

 

 

 

 

10

110

97

169

141

243

194

367

299

 

 

 

 

 

 

 

 

 

15

125

112

195

164

283

228

427

352

 

 

 

 

 

 

 

 

 

20

136

123

215

183

314

255

475

394

 

 

 

 

 

 

 

 

 

30

152

138

244

210

361

297

547

459

 

 

 

 

 

 

 

 

 

Page 20

Image 20
Contents Installation Instructions ML180UH Table of ContentsUnit Dimensions − inches mm TOP ViewParts Arrangement Shipping and Packing List Safety InformationML180UH Gas Furnace Use of Furnace as Construction Heater GeneralCombustion, Dilution & Ventilation Air Equipment in Confined Space ALL AIR from Inside Equipment in Confined Space Setting Equipment Return Air Plenum End Bottom Horizontal Application Installation Clearances Top LeftRight Filters Duct SystemVenting Upflow PositionTop Vent Discharge Left Side Vent DischargeSide Vent Discharge Horizontal Left PositionHorizontal Right Position Vent Connection Upflow and Horizontal Position Common Venting Using Metal−Lined Masonry Chimney −1/2 Cated or common venting system, you must inspect 18 − The common vent diameter must always be at least asFeet FAN + FAN FAN + NAT 112 175 169 278 Carbon Monoxide Poisoning Hazard Ers or straps. Install a drip leg in vertical pipe runs to − In some localities, codes may require the installationGas Piping Every 8 to 10 feet 2.44 to 3.01 m with suitable hangRight−Side Air Discharge Horizontal ApplicationLeft−Side Air Discharge Electrostatic Discharge ESD Interior MAKE−UP BOX InstallationElectrical Thermostat Designations ML180UH Schematic Wiring Diagram and Sequence of Operation Typical ML180UH Field Wiring Diagram Integrated ControlFor Your Safety Read Before Lighting Unit Start−UpHigh Altitude Gas Pressure AdjustmentProper Combustion Other Unit Adjustments Manifold Pressure Settings at all AltitudesHeat FAN-OFF Time in Seconds No Jumper453 900 750680 885Single Side Return Air − Air volumes in bold require field 1391860 653Service Electrical SHOCK, Fire Or Explosion HazardML180UH BURNER, Combustion AIR Inducer Assembly Heat Exchanger Removal−090, −110 −135 units −045 and −070 unitsPage Planned Service Repair Parts ListIntegrated Control Diagnostic Codes DescriptionTroubleshooting Heating Sequence of Operation Normal Heating Mode Abnormal Heating ModeHeating Sequence Troubleshooting Cooling Sequence of Operation Normal Cooling Mode Abnormal Cooling ModeTroubleshooting Continuous Fan Sequence of Operation Continuous Heat Speed FAN Sequence of Operation

Merit Series Gas Furnace specifications

Lennox International Inc. is a leading name in the heating and cooling industry, and their Merit Series Gas Furnace embodies the commitment to quality and efficiency that the company is known for. The Merit Series is designed to provide reliable heating in a sustainable manner, making it an excellent choice for homeowners seeking comfort without excessive energy bills.

One of the standout features of the Merit Series Gas Furnace is its efficiency ratings. The units in this series typically boast Annual Fuel Utilization Efficiency (AFUE) ratings of up to 95%. This level of efficiency means that the furnace converts a significant portion of the fuel it uses into heat, ultimately lowering operating costs. Such energy-efficient performance is not only beneficial for the wallet but also promotes environmental sustainability.

The Merit Series also incorporates advanced technologies that enhance its operation. The inclusion of a multi-speed blower motor is a notable feature that provides thoughtful airflow management throughout the home. By adjusting the speed according to the heating needs, the furnace optimizes comfort levels while minimizing noise and energy consumption. Homeowners can enjoy a warm environment without the disruptive sounds often associated with traditional furnaces.

Moreover, the Merit Series comes equipped with durable construction materials designed to withstand the test of time. From the robust heat exchanger to the heavy-gauge cabinet, Lennox focuses on longevity and reliability. This ensures that homeowners can trust their furnace to operate effectively even in the harshest winter conditions.

Safety features are also integral to the design of the Merit Series Gas Furnace. With an integrated Flame Sensor and a built-in safety shut-off system, the furnace ensures that any irregularities in operation are promptly detected and addressed. Such measures provide peace of mind for families using the heating system throughout the cold months.

Installation and maintenance are further simplified with the Merit Series. Its design facilitates easier access for HVAC professionals, allowing for quicker installations and routine service, ensuring that homeowners spend less time and money on upkeep.

In conclusion, Lennox International Inc.'s Merit Series Gas Furnace combines efficiency, advanced technology, and robust construction, making it a top choice for families looking to enhance their home's heating system. With its energy-saving innovations and commitment to reliability, the Merit Series stands as an exemplary option in today’s market.