Lennox International Inc Merit Series Gas Furnace installation instructions 112 175 169 278

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TABLE 7

Vent Connector Capacity

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

Serving Two or More Category I Appliances

 

 

 

 

 

Vent and Connector Diameter − D (inches)

 

 

 

Height

Lateral

 

 

 

 

 

 

 

 

 

 

 

 

 

3 Inch

4 Inch

 

 

5 Inch

 

6 Inch

H

L

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Appliance Input Rating in Thousands of Btu Per Hour

 

 

 

(feet)

(feet)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MIN

 

MAX

MIN

 

MAX

MIN

 

MAX

MIN

 

MAX

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

NA

 

NA

NA

 

NA

NA

 

NA

NA

 

NA

6

2

NA

 

NA

NA

 

NA

NA

 

NA

168

 

182

 

3

NA

 

NA

NA

 

NA

121

 

131

175

 

198

 

1

NA

 

NA

NA

 

NA

NA

 

NA

NA

 

NA

8

2

NA

 

NA

NA

 

NA

125

 

126

184

 

193

 

3

NA

 

NA

NA

 

NA

130

 

138

191

 

208

 

1

NA

 

NA

NA

 

NA

119

 

121

182

 

186

10

2

NA

 

NA

84

 

85

124

 

134

189

 

203

 

3

NA

 

NA

89

 

91

129

 

144

197

 

217

 

1

NA

 

NA

79

 

87

116

 

138

177

 

214

15

2

NA

 

NA

83

 

94

121

 

150

185

 

230

 

3

NA

 

NA

87

 

100

127

 

160

193

 

243

 

1

49

 

56

78

 

97

115

 

152

175

 

238

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

2

52

 

59

82

 

103

120

 

163

182

 

252

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

55

 

62

87

 

107

125

 

172

190

 

264

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

47

 

60

77

 

110

112

 

175

169

 

278

 

 

 

 

 

 

 

 

 

 

 

 

 

 

30

2

51

 

62

81

 

115

117

 

185

177

 

290

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

54

 

64

85

 

119

122

 

193

185

 

300

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTE − Single appliance venting configurations with zero lateral lengths are assumed to have no elbows in the vent system. For all other vent configurations, the vent system is assumed to have two 90° elbows. For each additional 90° elbow or equivalent (for example two 45° elbows equal one 90° elbow) beyond two, the maximum capacity listed in the venting table should be reduced by 10 percent (0.90 x maxi- mum listed capacity).

TABLE 8

Common Vent Capacity

Type B Double−Wall Vents with Single−Wall Metal 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

NA

78

NA

113

200

158

304

244

8

NA

87

NA

126

218

173

331

269

10

NA

94

163

137

237

189

357

292

15

121

108

189

159

275

221

416

343

 

 

 

 

 

 

 

 

 

20

131

118

208

177

305

247

463

383

 

 

 

 

 

 

 

 

 

30

145

132

236

202

350

286

533

446

 

 

 

 

 

 

 

 

 

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Contents Table of Contents Installation Instructions ML180UHTOP View Unit Dimensions − inches mmParts Arrangement Safety Information ML180UH Gas FurnaceShipping and Packing List General Use of Furnace as Construction HeaterCombustion, Dilution & Ventilation Air Equipment in Confined Space ALL AIR from Inside Equipment in Confined Space Setting Equipment Return Air Plenum Horizontal Application Installation Clearances Top Left RightEnd Bottom Duct System FiltersUpflow Position VentingTop Vent Discharge Left Side Vent DischargeHorizontal Left Position Horizontal Right PositionSide Vent Discharge Vent Connection Upflow and Horizontal Position Common Venting Using Metal−Lined Masonry Chimney −1/2 18 − The common vent diameter must always be at least as Cated or common venting system, you must inspectFeet FAN + FAN FAN + NAT 112 175 169 278 Carbon Monoxide Poisoning Hazard − In some localities, codes may require the installation Ers or straps. Install a drip leg in vertical pipe runs toGas Piping Every 8 to 10 feet 2.44 to 3.01 m with suitable hangHorizontal Application Left−Side Air DischargeRight−Side Air Discharge Interior MAKE−UP BOX Installation ElectricalElectrostatic Discharge ESD Thermostat Designations ML180UH Schematic Wiring Diagram and Sequence of Operation Integrated Control Typical ML180UH Field Wiring DiagramUnit Start−Up For Your Safety Read Before LightingGas Pressure Adjustment Proper CombustionHigh Altitude Manifold Pressure Settings at all Altitudes Other Unit AdjustmentsNo Jumper Heat FAN-OFF Time in Seconds750 453 900680 8851391 Single Side Return Air − Air volumes in bold require field860 653Electrical SHOCK, Fire Or Explosion Hazard ServiceHeat Exchanger Removal ML180UH BURNER, Combustion AIR Inducer Assembly−090, −110 −135 units −045 and −070 unitsPage Repair Parts List Planned ServiceDescription Integrated Control Diagnostic CodesNormal Heating Mode Abnormal Heating Mode Troubleshooting Heating Sequence of OperationHeating Sequence Normal Cooling Mode Abnormal Cooling Mode Troubleshooting Cooling Sequence of OperationContinuous Heat Speed FAN Sequence of Operation Troubleshooting Continuous 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.