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Filters:

Air filters 

must

 be used in every installation. For side

return installations, air filters 

must

 be installed external to

the furnace casing. An external filter rack kit with filter
(parts No. 20069901 or Cat. No. 68L75 12 / 15½" x 25"
sizes and 20069902 or Cat. No. 68L76 for 15½" / 19" x
25" sizes) is available as an optional accessory.

For bottom (end) return installations, the above

optional external rack may be used, if the unit was not
provided with a internal filter. Minimum filter size and
suggested filter materials are shown in Table 3. (If
different type filter is used, it must be an equivalent high
airflow capacity.)

Table 3 EXTERNAL FILTER RACK SIZE

MODEL

SIDE

RETURN

BOTTOM/END

RETURN

050-3
075-3

15 ½ X 25

12 X 25

075-4
100-3

15 ½ X 25

15 ½ X 25

100-5
125-5

15 ½ X 25

19 X 25

When installing the furnace with cooling equipment for

year round operation, the following recommendations
must be followed for series or parallel air flow:
1.

In series flow applications, the coil is mounted after
the furnace in an enclosure in the supply air stream.
The furnace blower is used for both heating and
cooling airflow.

2.

In parallel flow installation, dampers must be provided
to direct air over the furnace heat exchanger when
heat is desired and over the cooling when cooling is
desired.

IMPORTANT:

The dampers should be adequate to
prevent cooled air from entering the
furnace, and if manually operated, must
be equipped with means to prevent
operation of either the cooling unit or
furnace unless the damper is in the full
cool or full heat position.

The coil 

MUST

 be installed on the air discharge

side of the furnace. Under no circumstances
should the air flow be such that cooled, conditioned
air can pass over the furnace heat exchanger. This
will cause condensation in the heat exchanger and
possible failure of the heat exchanger that could
lead to a fire hazard and/or hazardous conditions
that may lead to bodily harm. Heat exchanger
failure due to improper installation will not be
covered by warranty.

VENTING

Venting for the furnace must be to the outside and in

accordance with local codes or requirements of the local
utility. In the absence of local codes, venting must
conform to the applicable sections of the latest edition of
the (U.S.) National Fuel Gas Code ANSI Z223.1/NFPA54,
and/or CSA  B149.1  Natural  Gas  and  Propane  Installation
Codes, and the vent manufacturers instructions.

This furnace is CSA International certified as a

Category I forced air appliance and 

can not be vented

into a vent system with any Category II, III or IV
appliance

. It must be vented vertically, or nearly

vertically, unless installed with a listed mechanical venter
in accordance with horizontal venting instructions. It must
not be connected to any portion of a mechanical draft
system operating under positive pressure

The 3" (in.) to 4" (in.) vent adaptor coupling (supplied

with unit)

 

MUST BE USED

It must be connected directly

to the outlet of the combustion blower using a field
supplied corrosion resistant sheet metal screw (See
Figure 8).

Figure 8

 

VENT ADAPTOR MOUNTING

Pre-Installation  Vent  System  Inspection:

Before this furnace is installed, it is highly

recommended that any existing vent system be
completely inspected.

For a chimney or "B" vent, this should include the

following:
1.

Inspection for any deterioration in the chimney or "B"
vent. If deterioration is discovered, the chimney must

20541501

 

Issue 0240

 

      Page 12 of 26

Содержание MPGA 050 B3

Страница 1: ...APPLICATION GUIDE GAS FURNACE Fit s All 80 English 02 2004...

Страница 2: ......

Страница 3: ...and liquids in the vicinity of this or any other appliance Installation and service must be performed by a qualified installer service agency or the gas supplier Installation by an unqualified person...

Страница 4: ...or the detection of leaks to check all connections as specified in The Gas Connection section on page 16 of these instructions 6 Always install furnace to operate within the furnace s intended tempera...

Страница 5: ......

Страница 6: ...s in place or A C evaporator in place When operating the furnace in the heating mode the static pressure and the temperature rise supply air temperature minus return air temperature must be within tho...

Страница 7: ...FURNACE WIRING SPECIFICATIONS 20541501 Issue 0240 Page 5 of 26...

Страница 8: ...lson Boulevard Arlington VA 22209 or the Canadian installation codes obtainable from Canadian Standards Association 178 Rexdale Boulevard Etobicoke Ontario Canada M9W 1R3 This furnace is designed for...

Страница 9: ...e furnace is to be installed in a crawl space consult local codes Use of a concrete pad 1 to 2 thick is recommended If the furnace is to be suspended from the ceiling it will be necessary to use steel...

Страница 10: ...on of gas proper venting and maintenance of ambient temperature at safe limits under normal conditions of use The furnace shall be located so as not to interfere with proper circulation of air In addi...

Страница 11: ...000 60 000 80 000 100 000 120 000 140 000 160 000 100 100 100 100 120 140 160 12 12 12 12 13 14 15 EXAMPLE 50 000 Btuh Furnace 10 000 Btuh Water Heater 60 000 Btuh Total Input 12 Dia Round Duct If ve...

Страница 12: ...n of rectangular air ducts must not be less than 3 inches Each opening must have a free area of not less than one square inch per 2 000 Btu per hour of total input of all appliances within the Confine...

Страница 13: ...re should be at least one 90 air turn between blower and return grille Further reduction in sound can be accomplished by installing acoustical air turning vanes and or lining the inside of the duct wi...

Страница 14: ...ace Under no circumstances should the air flow be such that cooled conditioned air can pass over the furnace heat exchanger This will cause condensation in the heat exchanger and possible failure of t...

Страница 15: ...use of one of the following auxiliary draft inducer kits Table 4 AUXILIARY DRAFT INDUCERS Vent Kit MFR Model Furnace Input Field Controls Co SWG 4G 50000 75000 100000 or 125000 Tjernlund Products Inc...

Страница 16: ...ssure switch tubing from the combustion blower 3 Remove the four 4 screws that secure the combustion blower adaptor plate to the flue collector box taking care to support the blower assembly so that i...

Страница 17: ...ny other gas fired burning appliance to their previous conditions of use ELECTRICAL CONNECTIONS When installed the furnace must be electrically grounded in accordance with local codes or in the absenc...

Страница 18: ...ifically for the detection of leaks to check all connections A fire or explosion may result causing property damage personal injury or loss of life The furnace and its individual shutoff valve must be...

Страница 19: ...20541501 Issue 0240 Page 17 of 26 THEORY OF OPERATION...

Страница 20: ...g completed and the furnace has been properly vented the unit should be started and adjusted for proper operation Check off the following steps as they are completed 1 Be sure all electrical power is...

Страница 21: ...of gas flow by using the formula provided below or Table 5 Cubic Ft Hr Number of Dial Revolutions x Cubic Foot Revolution x 3600 Time in seconds Required for Number of Timed Revolutions TABLE 5 Gas R...

Страница 22: ...ifold pressure The appropriate manifold pressures based on the elevation and the heating value can be found in Table 7 TABLE 7 High Altitude Manifold Pressure Derate with standard 42 orifice Natural 5...

Страница 23: ...h The furnace should be allowed to cool off before attempting to reset the switch Failure to follow these instructions could result in injury due to burns The switch located behind the burner access p...

Страница 24: ...SEQUENCE OF OPERATION Direct ignition system control 20541501 Issue 0240 Page 22 of 26...

Страница 25: ...This will expose both the burner and flue openings of the primary heat exchangers 6 Vacuum the length of each heat exchanger tube using a straight attachment into the burner openings and the flue ope...

Страница 26: ...2 screws located in the blower compartment that secure the blower legs to the blower partition panel 7 Slide the blower forward about two 2 inches This will disengage the rear of the blower legs from...

Страница 27: ...TROUBLE SHOOTING With LED Indicator Assistance 20541501 Issue 0240 Page 25 of 26...

Страница 28: ...WIRING DIAGRAM 20541501 Issue 0240 Page 26 of 26...

Страница 29: ...he CSA International symbols on each nameplate is your assurance that your furnace design meets nationally recognized standards for safety and performance Do not store or use gasoline or other flammab...

Страница 30: ...dor of gas is present Use only your hand to adjust the gas control switch never use tools If the switch will not move by hand don t try to repair it call a qualified service technician Force or attemp...

Страница 31: ...tat dial or lever to select the temperature you would like the system to maintain Fan Operation You may wish to increase your comfort by setting your system for continuous air circulation of the indoo...

Страница 32: ...flashlight will be useful for these inspections Make one inspection prior to the beginning of the heating season and another during the middle Should you observe unusual amounts of any of the followi...

Страница 33: ...and place back in furnace To clean a permanent filter shake filter to remove excess dirt and or use a vacuum cleaner Wash filter in soap or detergent water and replace after filter is dry Permanent fi...

Страница 34: ...ner Blower Motor Blower Door Shield Top Bottom Blower Wheel Orifice Capacitor Ignitor Blower Support Leg Gas Control Sensor ELECTRICAL GROUP HEAT EXCHANGER GROUP INDUCER GROUP Access Door Primary Heat...

Страница 35: ...FURNACE MARKINGS IN FRENCH CONSULT WITH YOUR DEALER OR LOCAL DISTRIBUTOR HAVE AVAILABLE THE MODEL NO AND SERIAL NO LOCATED ON THE UNIT RATING PLATE TO INSURE THE CORRECT FRENCH INSTRUCTION PACKET POUR...

Страница 36: ......

Страница 37: ...510 88 111 Fax 420 2 579 10 393 e mail janka janka cz LENNOX DISTRIBUTION MOSCOW Tel 7 095 933 29 55 Fax 7 095 926 56 50 e mail lennox dist moscow co ru LENNOXSLOVENSKOs r o Tel 421 7 44 87 19 27 Fax...

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