7.
Position the replacement burner assembly in place with its tabs penetrating the metal top
plate. Make certain that the white thermal shield at the top of the burner lies under the burner
opening in the metal top plate. Bend the tabs at the top of the burner assembly outward to
hold it in place.
8.
Run all wires through the hole in the top plate below the PCB while lowering the top plate
onto the trap housing. Install the screw in the center of the top plate which secures the top
plate to the vertical rod. Install the metal channel and secure using the eight screws. Be sure
the metal strip retaining the insulation material is in place before the screws are secured.
(Note: Insulation material not present on model MT-125).
9.
Fasten the PCB in place with three nuts and connect the wires to the PCB as follows:
a). Red motor wire to motor terminal marked plus. Black motor wire to motor
terminal marked minus.
b). Red heater wires (2) to terminals marked heater.
c). White valve wires (2) to terminals marked valve.
d). Black AC power wires to the AC terminals at the rear edge of the PCB
e). Wrap thin red and yellow thermocouple wires securely around posts on PCB
with the red wire on post marked plus and the yellow wire on post marked
minus. Make certain these wires are wrapped tightly around their respective
posts. DO NOT SOLDER WIRES TO POST.
10.
Connect the copper tube to the valve at the bottom of the burner.
1 1. Connect the ribbon wire from the underside of the top cover to the PCB taking care to engage
all slots in the plug with corresponding pins in the socket. (Not applicable for MT-1 25).
12.
Install the top cover by spreading the louvers at the rear of the unit to engage the boss at
the rear of the cover and secure with screw. Install the two screws in the front of the unit to
secure the top cover to the metal plate.
13.
Attach electrical plug and gas regulator. Open propane valve on tank, press off/reset button
on switch panel and set mode to 24/7. Unit should start and run in 7-10 minutes as
evidenced by the fan running continuously and the LED lights inside the unit remaining on.
