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Lennox Merit MPE36 Service Manual

Merit series
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Service Manual
Lennox Electric Fireplaces
Merit Series
MPE36
MPE33

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Summary of Contents for Lennox Merit MPE36

  • Page 1 Service Manual Lennox Electric Fireplaces Merit Series MPE36 MPE33...

  • Page 2: Table Of Contents

    Removal of glass panel page 5 service personnel working on • Component identification page 7 • Confirm pow er supply page 8 Lennox Electric Fireplaces. • Transformer testing page 9 • Do not attempt to service this • Flame panel removal page 11 electrical appliance if: •...

  • Page 3: Removal Log Grate

    Remove Grate and Log • The grate must be removed before removing the log set. • Remove the two screws that secure the grate in place and remove the grate. • Place your thumbs on the front edge of the ember base approximately 1/3 of the way in from the ends of the log set.

  • Page 4: Changing Ember Bulbs

    Changing ember bulbs • Remove logs and grate (see page 3) • On MPE36R replacement bulbs will be found in a pocket in the log set • Lift at the front of the plastic ember bed to “pop” it up and release it. •...

  • Page 5: Removal Of Glass Panel

    Removal of rear glass panel • Remove logs and grate • Remove ember bed • Remove screws from right and left retaining brackets • Remove screws from top retaining bracket Caution: wear protective gloves when removing or handling the glass panel. Gloves will help prevent cuts and will also prevent the oils from your hands from staining...
  • Page 6 Removal of rear glass panel (continued) • Grasp glass panel at top and tip forward. • With panel loose, grasp on top and bottom edges to remove from fireplace.

  • Page 7: Component Identification

    Components • Control board • Transformer • Remote control receiver • Flame cover panel Fuse location • Motor and Flame cylinder...

  • Page 8: Confirm Pow Er Supply

    Power supply • When the electric fireplace is initially connected to a power supply: – By plugging in the power cord to a receptacle – By turning on the circuit breaker (hard wired connection at the junction box) • The control board will emit two loud “beeps”...

  • Page 9: Transformer Testing

    Testing Transformer • Caution: electrical shock hazard! • This tests confirms that line voltage 120 VAC is available to power the transformer. • Place multimeter leads on control board terminals as shown. • Line voltage should be between 105 VAC – 127 VAC.
  • Page 10 To test the transformer: •Remove the low voltage connector (two red wires) from the control board as shown. On the side of the connector two silver terminals will be visible. •Set your Multimeter to test AC voltage. Touch the probes to the two silver connectors on the transformer wires.

  • Page 11: Flame Panel Removal

    Removal of flame panel • Use wire cutters to clip the plastic wire tie binding the remote control receiver wire. • Use a screwdriver to remove the screws on the right and left edges of the flame cover panel. • The panel may be placed upon the floor in front of the fireplace during...

  • Page 12: Flame Cylinder Bulb Replacement

    Changing bulbs in flame cylinder • Grasp the top of the flame cylinder and squeeze gently disengaging the flame cylinder cover. • Lift the cover off to expose the two flame bulbs. Caution: The edges of the flame cylinder may be sharp! Wear protective gloves to prevent injury...

  • Page 13: Lights: Flame And Ember

    Lights: Flame and Ember • With the flame cylinder cover removed, the two bulbs are visible. • When the flame switch is activated the bulbs should light and the flame wheel should turn. • Use the remote control to brighten and to dim the flame bulbs and the ember bed bulbs.
  • Page 14 If ember and flame lights fail to operate •Check the in-line fuse located to the right of the control board. •Perform a continuity test on the fuse. If the multimeter displays “1” the fuse has blown and must be replaced. •If the bulbs and fuse test “OK”...

  • Page 15: Electrical Junction Box Access

    Access to electrical junction box • Turn off power to the fireplace by either unplugging the power cord or setting the circuit breaker in the home’s electrical panel to the “off” position. • Remove screws in junction box cover. Wire connections to a) factory supplied power cord or b) Romex power supply should be as follows: 120VAC line fireplace...

  • Page 16: Optional W All Thermostat

    Wires for optional controls • The junction box contains two wires that may be used for an optional wall switch to control the flame and/or an optional thermostat to control the heater. • A length of black and white wire is provided for the connection of an optional wall mounted thermostat kit.

  • Page 17: Optional W All Sw Itch

    Electrical junction box • A length of red wire may be bundled in the bottom of the junction box. • This allows operation of the fireplace from an optional wall mounted switch. • See the drawing for proper wiring • Note: to operate the fireplace from...

  • Page 18: Control Board

    Control board • Replacement part # H1625 – Contains: – Control Board – Remote Receiver Procedure for replacing control board: • Disconnect Power Supply by unplugging power cord or turning off circuit breaker. • Orient replacement board to match defective board. •...
  • Page 19 Control board wiring 120 VAC to transformer Line voltage to Temperature 24 VAC from Control Panel Switch Heater Elements sensor-heater transformer to board Main Power on/off Black/Black (also to optional wall Flame/Ember on/off switch) switch Red/Red Red/Black...
  • Page 20 Control Board Wiring (Hot) L-FAN: Black wire P-L: Black wire (hot) from junction box- to board- to (hot) to fan motor fusible link L-Light: Yellow wire L-M: Brown wire (hot) to ember lights (hot) to flame motor L-R1 & L-R2: Red wires (hot) to heater element L-Flame: Purple wire(hot) to flame...
  • Page 21 Control board wiring (neutral) N-M: White wire (neutral) from L-N: Not used flame wheel motor N-Flame: White (neutral) from flame wheel lights N-Fan: White wire(neutral) from fan motor N-Power: White wire(neutral) from junction box to control board N-Light: white wire (neutral) from ember lights...
  • Page 22 Transformer/ Sensors/ Switches Temperature sensor Heater switch black/black black/yellow 120 VAC to transformer black/red Main power switch red/red Wire for optional wall thermostat Not used black/white (stored in junction box) Flame/Embers on-off switch red/black Remote control sensor white 24 VAC from transformer red/red...

  • Page 23: Remote Control Sensor

    Remote control sensor...

  • Page 25: Flame Cylinder Motor Replacement

    Replacement of flame cylinder motor • Use wire cutter to remove plastic wire ties as shown • Expose two crimp on wire nuts (white to black) and (brown to black) leading to the motor...
  • Page 26 Motor removal • Cut crimped on wire nuts to allow removal of the motor, • Use a small Phillips head screw driver to loosen the linkage clamp. • Use needle-nose pliers to loosen the nuts securing the motor to its mounting bracket...
  • Page 27 Motor removal • Remove the defective motor.
  • Page 28 Replacement motor • Slide the replacement motor into the rubber linkage and tighten. • Reinstall motor mounting screws and tighten the two hex nuts • With wire strippers strip the ends of the replacement motor wires and also of the brown and white wires as shown.
  • Page 29 Control switches • Top photo: Main power switch (note 4 red wires are connected to this switch to allow for the use of an optional wall switch) • Middle photo: Heater switch (Black and yellow wires) • Lower photo: Flame switch (Red and black wires) •...

  • Page 30: Control Panel Sw Itches

    Continuity test: control panel switches • Earlier production models of the MPE-36R have switches that were soldered to their wires rather than the push on connector that are used on later models. • To test these soldered switches: – See page 21 of the manual for the location of the sw itch connector at the control board.

  • Page 31: Remote Control Does Not Function

    Remote control does not function • Power switches must be correctly set to allow remote control operation. • When the switches are correctly set, a “beep” will be heard whenever a button on the remote control is depressed. • If no sound is heard test in this order: –...

  • Page 32: Heater Sensor

    Heater sensor • The heater sensor measures the air temperature and turns the heater and blower on and off based upon the setting of the remote control. • If the heater does not turn on, the remote may have been set to a temperature lower than the current room temperature.

  • Page 33: Heater Access

    Heater Access • Remove screws to release heater panel • Grasp handle and lower heater to the service position. • The heater will be suspended by two wire cables...

  • Page 34: Testing The Heater/Blow Er

    Testing the heater • Testing the fuse plate assembly • Unplug the fireplace or turn off the power at the circuit breaker. • Remove one black wire lead to the fuse plate assembly as shown • Perform a continuity test with the multimeter set to Ohms.
  • Page 35 Testing the heater (continued) • Continuity test Fuse Plate Assembly • Remove one black lead as shown. • Set multimeter to “Ohms” to measure resistance. • Touch probes to spade connectors on fuse plate assembly as shown. • If multimeter displays “1” the fuse plate assembly has failed and must be replaced.
  • Page 36 To replace “fuse plate assembly” screw screw • Disconnect wires as shown above. • Remove screws from end of fuse plate assembly • Replace with part # H5043...
  • Page 37 Heater element wiring Orange Blue • Heating element wiring: • Orange : Top center terminal • Blue wires N1 & N2: Middle terminals • Red wires (from control board): lower terminals...
  • Page 38 Blower wiring 120VAC From Left: Black White Orange Blue Blue • Note: 120 VAC operation: • Blue wires N1 & N2 run directly from electrical junction box to the heater element. • Orange wire (dummy wire in 120 VAC installation) also runs directly from the electrical junction box to the heater element.
  • Page 39 Blower wiring 240 volt From left: Black White Orange Blue Blue • Note: 240 VAC operation: • Blue wires N1 & N2 run directly from electrical junction box to the heater element. (Blue wires are not used in 240VAC and must not be connected to a power source in the junction box.
  • Page 40 Heater element wiring Orange Blue • To test the heater element: • Turn off all power at the circuit breaker or unplug the power cord (120VAC) • Remove orange wire, both blue wires, and both red wires from the heater element. •...
  • Page 41 Electrical grounding • For safe operation the fireplace must be grounded. • In electrical junction box the green ground wire from the power supply must be firmly connected to the green and yellow wire shown here. Confirm that the ground wire is properly and securely fastened to the ground screw located to the left of the flame wheel motor.

  • Page 42: Junction Box Wiring

    Junction box wiring...
  • Page 43 Wiring diagram 120 Volt...
  • Page 44 Wiring diagram 240 Volt...

  • Page 45: Parts List

    MPE-33R...
  • Page 47 MPE-36R...

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Merit mpe33

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