background image

11. Set the thermostat to the desired setting.

12. If the furnace will not operate, follow the instructions

in 

"To Turn Off Gas to Furnace"

 and call your

service technician or gas supplier.

To Turn Off Gas to Furnace

 1. Set the thermostat to the lowest setting.

 2. Turn off all electric power to the furnace if service is

to be performed.

 3. Remove the burner compartment access panel.

 4. Move the gas control switch to "OFF" (see Figure 1).

Do not force.

 5. Replace the burner compartment access panel.

Temperature Control

There are many types and styles of thermostats. Yours
may look different from the one pictured in Figure 2,
depending on the type of thermostat and whether cooling
was installed with the system. However, almost all
thermostats perform the same basic functions described
in the following section.

Figure 2

Thermostat Operation

There are two (2) switches located on the thermostat (see
Figure 2). One switch controls the heating and cooling (if
applicable) functions. The other switch is for "FAN"
operation, either continuous or automatic. On the
thermostat is the temperature range for the heating
temperature and the cooling temperature desired.

To put the system into operation, push the switch to
either "HEAT" or "COOL" position. After you have chosen
the type of operation you desire, move the thermostat 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 indoor air.
The fan switch on the thermostat permits you to do this.

With the switch in the "ON" position the fan will operate
continuously. "AUTO" position gives fan operation only
when the unit is in either heating or cooling.

What to do if your unit is not heating properly

If your furnace is operating but fails to provide complete
comfort, check the following before calling for service:

 1. Be sure the thermostat setting is correct.

 2. Check to see if the filter is clean.

 3. Be sure air can circulate freely throughout your home.

Do not block supply registers or return grilles with
furniture or rugs.

And if you also have cooling...

 4. Keep surface of the outdoor coil free from dirt, lint,

paper, or leaves.

 5. Check and clean indoor coil, if necessary. (This

check should be made at the start of each cooling
season by your service technician).

What to do if your unit fails to operate

 1. Be sure the main switch that supplies power to the

furnace is in the "ON" position.

 2. Replace any burned-out fuses or reset circuit

breakers.

 3. Be sure the thermostat is properly set.

 4. If the furnace still does not start, call your service

technician.

Should the gas supply fail to shut off or if
overheating occurs, shut off the gas valve to the
furnace before shutting off the electrical supply.

20541401

 

Issue 0229

 

       Page 3 of 6

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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