THIS PROCEDURE MUST BE PERFORMED BY A QUALIFIED TECHNICIAN.
Applicable to 4100 Series units built 2007 or later. For earlier models, see this topic
WARNING
HAZARDOUS VOLTAGE: Risk of electric shock. Can cause injury or death. Heater may be connected to more than one branch circuit. Disconnect power to all circuits before servicing.
Part Numbers
Item #1021035R Blower 2100/4100 240V ReplNOTE: Both core blowers MUST be replaced with same manufacturer for proper operation.
Disconnect Power
Disconnect power to all branch circuits of the heating system and remove the electrical panel cover.
Remove Processor Control Board
Remove the control panel (Figure 5) and set aside.
Figure 5:
Disconnect Transformer Wires
Disconnect the transformer wires from R and C and the two yellow wires from the "Air" terminals on the LV circuit board (Figure 5). Mark wires for re-installation.
Move Transformer
Remove the screws holding the transformer in place and move the transformer to the side.
Remove Center Panel
Remove the screws around the perimeter of the center plate (Figure 5) of the electrical panel. Move the center plate, with circuit boards attached, to the right of the electrical compartment. (See Figure 6)
Figure 6:
NOTE: Use caution to not damage wiring when moving the plates.
Remove Left-Side Electrical Plate
Remove the screws around the perimeter of the left plate (Figure 5) of the electrical panel and set it aside to gain access to the core blowers (See Figure 6).
Disconnect Core Blower Wires
Disconnect core blower line voltage and ground wires. Mark wires for new installation.
Remove Brackets
Remove the two brackets (Figure 7) securing the core blowers.
Figure 7:
Detach Right Core Blower
Slide the right core blower to the right and set in the heater base.
Remove left Core Blower
Slide the left core blower to the right and remove.
Remove Right Core Blower
Remove right core blower from the heater base.
Position New Blowers
When installing the new core blower(s) set one on the right corner of the heater base.
Install New Blowers
Slide the left core blower, with the wheel to the inside of the heater, into place then the right core blower.
Re-Install Brackets
Re-install the two brackets securing both core blowers.
Connect Core Blower Wires
Connect core blower and ground wires.
Re-Install Brackets
Re-assemble the electric panel by securing the left plate first, then secure the center plate. (See Figure 6)
NOTE: Use caution to not damage wiring.
Re-Install Transformer
Re-install the transformer, securing the yellow wire with ring terminal to the left screw. Connect the blue wire to R and the yellow and yellow/black wire to C terminals on the LV circuit board.
Connect Air Terminal Wires
Connect 2 yellow wires to Air terminals on the LV circuit board.
Secure the Electrical Panel
Secure control panel (Figure 5) and electrical panel cover.
Verify Locations
Verify Location 94 (L094) is set to a value of 195. If 208V application Location 28 (L028) must be set to 10. For information on how to access location values, click here.
Complete System Checkout
Complete the system check-out procedure and verify core blower operation.