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5

DUCT SYSTEM

INSTALLING OPTIONAL

COOLING COIL

The unit is provided with knock-outs for either right or left-
side connection of the supply and return air plenums.
Refer to the dimensioned drawing on page 2 to locate and
size the plenum entry into the side of the building.
Cover plates are provided to seal the unused knock-outs and
these become convenient access ports for regular service
and maintenance.
Size and install supply and return air duct system using
industry-approved standards that result in a quiet and
low-static system with uniform air distribution. The furnace
access panel must always be in place when the unit is in
operation and it must not allow leaks into the duct system.
Construct a protective covering made of suitable materials to
shield the plenum connections from rain. Rain shield should
be attached to the side of the unit cabinet above the plenum
connections and span the distance to the building wall above
the plenum entry into the structure. Rain shield connections
must be caulked so that they are weather-tight.

If optional cooling coil is to be used, install coil according to
the steps indicated below:
1. Remove Lennox Merit Series

™

Gas Furnace unit rear

panel.

NOTE:

Installation of larger evaporator coils may require

removal of unit top panel as well.
2. Place cooling coil on unit coil deck in cooling

compartment.

3. Using template provided with the coil, cut holes for

refrigeration and drain piping. Align coil with piping holes
in panel. Seal holes around piping.

4. Reinstall Lennox Merit Series

™

panel.

5. Make refrigerant piping connections to condensing unit

per local codes and sound plumbing practices.

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Содержание Merit Series

Страница 1: ...N TABLE OF Contents Lennox Merit Series Furnace Specifications 2 Lennox Merit Series Gas Furnace 3 Shipping and Packing List 3 Requirements 3 General 4 Shipping and Packing List 4 General 4 Location Placement 4 Duct System 5 Installing Optional Cooling Coil 5 Venting 6 General Lennox Merit Series E or EC Series 17 Gas Piping 17 Electrical 18 Filters 19 Duct System 19 Venting 19 Gas Piping 19 Elect...

Страница 2: ...2 80 ML18007036A EC 456 512 80 533 ML18011060C E 544 600 123 ML18011060C EC 544 600 123 438 ML18013560D E 633 690 167 ML18013560D EC 633 690 167 438 LENNOX MERIT SERIES FURNACE SPECIFICATIONS NOTE DUCT CONNECTIONS ARE INTERCHANGEABLE FROM SIDE TO SIDE ...

Страница 3: ...carpeting tile or other combustible material other than wood flooring For installation in a residential garage the furnace must be installed so that the burner s and the ignition source are located no less than 457 mm 18 in above the floor The furnace must be located or protected to avoid physical damage by vehicles When a furnace is installed in a public garage hangar or other building that has a...

Страница 4: ...ther four flexible mounting legs or three flexible legs and one rigid leg The rigid leg is equipped with a shipping bolt and a flat white plastic washer rather than the rubber mounting grommet used with a flexible mounting leg This shipping bolt and flat washer must be removed before the furnace is put into operation Once the shipping bolt and washer are removed the rigid leg will not touch the fa...

Страница 5: ... covering made of suitable materials to shield the plenum connections from rain Rain shield should be attached to the side of the unit cabinet above the plenum connections and span the distance to the building wall above the plenum entry into the structure Rain shield connections must be caulked so that they are weather tight If optional cooling coil is to be used install coil according to the ste...

Страница 6: ...0 1500 300 500 1500 K From a mechanical air inlet including a spa blower 1500 1000 N Vertically below an openable window non mechanical air inlet or any other opening into a building with the exception of sub floor ventilation Space heaters up to 50 Mj h input Other appliances up to 50 Mj h input Appliances over 50 Mj h input and up to 150 Mj h input Appliances over 150Mj h input 150 500 1000 1500...

Страница 7: ...Lift the assembly and ro tate it 90 degrees clockwise or counterclockwise to ei ther the 3 o clock position or to 9 o clock position Re secure with four screws Gasket should be left in place 2 Use tin snips to cut preferred opening on the cabinet for repositioning the flue outlet Use the cut out piece as a cover plate to patch unused opening on cabinet UPFLOW POSITION Left Side Vent Discharge FIGU...

Страница 8: ...he other side of orifice plate and re connect pressure switch hose Re secure pressure switch wires Either pull excess wires through the blower compartment and secure using supplied wire tie or coil excess wire and secure to the gas manifold FLOW AIR Cut combustion air inducer tubing from 225mm to 125mm to avoid interference with inducer motor HORIZONTAL RIGHT POSITION Top Vent Discharge FIGURE 8 R...

Страница 9: ... minimum of six inches 152 mm from the furnace vent outlet See figure 10 Venting Using a Masonry Chimney The following additional requirements apply when a lined masonry chimney is used to vent this furnace Masonry chimneys used to vent Category I central fur naces must be either tile lined or lined with a listed metal lining system or dedicated gas vent Unlined masonry chimneys are prohibited See...

Страница 10: ... lined or relined with suitable materials or replaced with a gas vent or chimney suitable for venting the units The chimney passageway must be checked periodically to ensure that it is clear and free of obstructions Do not install a manual damper barometric draft regulator or flue restrictor between the furnace and the chimney Never connect a Category I appliance to a chimney that is servicing a s...

Страница 11: ... listed in the common venting tables should be reduced by 20 the equivalent of two 90 elbows 0 80 x maximum common vent capacity The horizontal length of the offset shall not exceed 1 1 2 feet 46 m for each inch 25 mm of common vent diameter 10 The vent pipe should be as short as possible with the least number of elbows and angles required to com plete the job Route the vent connector to the vent ...

Страница 12: ...Lateral L Vent and Connector Diameter D mm 76mm 100mm 125mm 150mm Appliance Input Rating in Thousands of Btu Per Hour MIN MAX MIN MAX MIN MAX MIN MAX 1 8 2 4 4 5 3 0 6 0 9 0 0 0 78 0 152 0 251 0 375 0 6 13 51 18 97 27 157 32 232 1 2 21 49 30 94 39 153 50 227 1 8 25 46 36 91 47 149 59 223 0 0 84 0 165 0 276 0 415 0 6 12 57 16 109 25 178 28 263 1 5 23 53 32 103 42 171 53 255 2 4 28 49 39 98 51 164 6...

Страница 13: ... 132 171 188 261 36 93 56 190 80 325 116 499 38 69 57 136 80 225 115 337 51 63 75 128 102 216 144 326 NA NA 95 116 128 201 182 308 NA NA NA NA 158 186 220 290 35 96 54 200 78 346 114 537 37 74 56 148 78 248 113 375 50 68 73 140 100 239 141 363 NA NA 93 129 125 223 177 344 NA NA NA NA 155 208 216 325 NA NA NA NA 186 192 254 306 34 99 53 211 76 372 110 584 37 80 55 164 76 281 109 429 49 74 72 157 98...

Страница 14: ... 220 22 53 35 96 49 153 66 235 24 55 36 102 51 163 68 248 6 0 21 54 33 99 46 157 62 246 22 57 34 105 48 167 64 259 23 60 35 110 50 176 66 271 9 0 20 62 31 113 45 181 60 288 21 64 33 118 47 190 62 299 22 66 34 123 48 198 64 309 Common Vent Capacity Type B Double Wall Vents with Type B Double Wall Connectors Serving Two or More Category I Appliances Vent Height H m Common Vent Diameter D mm 100mm 12...

Страница 15: ...2 175 169 278 0 6 51 62 81 115 117 185 177 290 0 9 54 64 85 119 122 193 185 300 NOTE Single appliance venting configurations with zero lateral lengthsare 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 capacit...

Страница 16: ...or other deficiencies which could cause an unsafe condition 3 Closeall building doors and windowsand all doors be tween the space in which the appliances remaining connected to the common venting system are located and other spaces of the building Turn on clothes dry ers and any appliances not connected to the common venting system Turn on any exhaust fans such as range hoods and bathroom exhausts...

Страница 17: ...ating must be considered to avoid excessive pressure drop Unit connection at gas manifold is 1 2 in 12mm Size piping according to gas regulations 3 Gas piping must not run in or through air ducts clothes chutes chimneys or gas vents dumb waiters or elevator shafts 4 Piping should be sloped 6mm per 380mm upward toward the meter from the furnace The piping must be supported at proper intervals 2m us...

Страница 18: ... may operate the blower continuously factory set at low speed through the thermostat FAN ON switch Systems which do not include a cooling sub base require a toggle switch which must be wired between terminals R and G on the thermostat connection terminal strip The blower motor will operate at the designated speed during cooling or heating demand however when demand is satisfied blower speed will r...

Страница 19: ...allation Code AG601 ES5601 for gas piping requirements and gas pipe sizing tables Gas supply piping should not allow more than 125 Pa 0 5 W C drop in pressure between gas meter and unit Supply gas pipe must not be smaller than unit gas connection The Lennox Merit Series Gas Furnace is a fan assisted furnace equipped with an integral mechanical means to either draw or force products of combustion t...

Страница 20: ...Right Side Piping Alternate AUTOMATIC GAS VALVE DRIP LEG DRIP LEG MANUAL MAIN SHUT OFF VALVE With 3mm NPT Plugged Tap Shown MANUAL MAIN SHUT OFF VALVE With 3mm NPT Plugged Tap Shown NOTE BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET GROUND JOINT UNION DRIP LEG MANUAL MAIN SHUT OFF VALVE GROUND JOINT UNION DRIP LEG MANUAL MAIN SHUT OFF VALVE GROUND JOINT UNION DRIP LEG MANUAL MAIN SHUT OFF VA...

Страница 21: ...e is provided on the right side of the unit Plug the harness into the IEC receptacle and into a properly sized wall plug Refer to figure 18 schematic wiring diagram 1 Ensure that power connection point is located with 2m of furnace 2 Holes are on both sides of the furnace cabinet to facilitate thermostat wiring 3 Before connecting the thermostat wiring check to make sure the wires will be long eno...

Страница 22: ...ted control Generator Use Voltage Requirements The following requirements must be kept in mind when specifying a generator for use with this equipment The furnace requires 230 volts 10 The furnace operates at 50Hz 5 The furnace integrated control requires both polarity and proper ground Both polarity and proper grounding should be checked before attempting to operate the furnace on either permanen...

Страница 23: ...23 Figure 18 LENNOX MERIT SERIES GAS FURNACE Schematic wiring diagram ...

Страница 24: ...n The Lennox Merit Series units are equipped with an automatic ignition system Do not attempt to manually light burners on these furnaces Each time the thermostat calls for heat the burners will automatically light The ignitor does not get hot when there is no call for heat on units with an automatic ignition system Gas Valve Operation 1 STOP Read the safety information at the beginning of this se...

Страница 25: ...ombustion process continues 6 If flame is not detected after first ignition trial the ignition control will repeat steps 3 and 4 four more times before locking out the gas valve WATCHGUARD flame failure mode The ignition control will then automatically repeat steps 1 through 6 after 60 minutes 7 To interrupt the 60 minute WATCHGUARD period move thermostat from Heat to OFF then back to Heat Heating...

Страница 26: ...cing to ensure proper combustion at higher altitudes Refer to table 4 for manifold pressure and Table 5 for pressure switch change and gas conversion kits For safety shut unit off and remove manometer as soon as an accurate reading has been obtained Take care to replace pressure tap plug IMPORTANT Table 4 Manifold Pressure Settings at all Altitudes Model Input Size Gas 0 610m 0 2000 ft 611 914m 20...

Страница 27: ...position across the five pins on the integrated control The unit is shipped with a factory fan off delay setting of 60 seconds The fan off delay affects comfort and is adjustable to satisfy individual applications Adjust the fan off delay to achieve a supply air temperature between 32 C and 43 C at the moment that the blower is de energised Longer off delay settings provide lower return air temper...

Страница 28: ... pressure After one hour of continuous thermostat demand for heat the Watchguard will break and remake thermostat demand to the furnace and automatically reset the integrated control to begin the ignition sequence ELECTRICAL SHOCK FIRE OR EXPLOSION HAZARD Failure to follow safety warnings exactly could result in dangerous operation serious injury death or property damage Improper servicing could r...

Страница 29: ... furnace 2 Label the wires from gas valve roll out switches primary limit switch and make up box then disconnect them 3 Disconnect gas supply piping Remove the screw securing the burner box cover and remove cover Remove the four screws securing the burner manifold assembly to the vestibule panel and remove the assembly from the unit 4 To clean burners run a vacuum cleaner with a soft brush attachm...

Страница 30: ...30 Page 19 of 26 COIL FITTING INSTRUCTIONS Figure 22 Figure 23 COILING FITTING INSTRUCTIONS ...

Страница 31: ...International nameplate Example ML18007036A E All service must be performed by a licensed professional installer or equivalent service agency or gas supplier Cabinet Parts Upper access panel Blower panel Top cap Control Panel Parts Transformer Integrated control Door interlock switch Circuit breaker Blower Parts Blower wheel Blower housing Motor Motor mounting frame Motor capacitor Blower housing ...

Страница 32: ...32 Figure 25 LENNOX MERIT SERIES EXTERNAL PARTS ARRANGEMENT LENNOX MERIT SERIES EXTERNAL WITH COIL PARTS ARRANGEMENT Figure 26 ...

Страница 33: ...Australia 13 23 50 New Zealand 0800 653 330 Web www lennoxaus com au ...

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