THIS PROCEDURE MUST BE PERFORMED BY A QUALIFIED TECHNICIAN.
Item #1023067R - Relay Expansion 8 Relay Replacement Board
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.
Disconnect Power
Disconnect power to the heating system.
Remove Electrical Panel Cover
Remove the electrical panel cover and locate the relay expansion board(s).
Disconnect Interface Cables
Disconnect the interface cable(s) from the expansion board(s) being replaced.
Disconnect L1 and L2
Disconnect the wires from L1 and L2 240.
Disconnect Element Wires
Disconnect the wires for the elements, labeling their positions on the board.
Remove Relay Expansion Board
Remove the existing relay expansion board(s) by removing the five screws.
Verify Jumpers
Verify J1 and J2 jumpers (Figure 1) are in the correct positions for the application.
- First relay expansion board: J1 and J2 jumpers MUST be OFF.
- Second relay expansion board: J1 jumper MUST be ON and J2 jumper MUST be OFF.
NOTE: Models 3120, 4120, or 5120 only have one relay expansion board; therefore, jumpers 1 and 2 MUST both be OFF.
Models 4130, 4140, 5130, and 5140 have both a first and second relay expansion board. Make sure the top relay expansion board is configured as expansion board one and the bottom relay expansion board is configured as expansion board two.
Mount the New Relay Expansion Board
Mount the new relay expansion board(s) using the screws removed in Step 6.
Connect Wires to L1 and L2
Connect the wires to L1 and L2 240.
Connect Element Wires
Connect the element wires back in the same positions as on the original board.
Connect Interface Cable
Connect the interface cable(s).
Install Cover
Reinstall the electrical panel cover and energize the system.
Complete Checkout
Ensure proper operation by completing the Installer’s Final Check-Out Procedure.
Links:
Verify Location 40
Verify the value in Location 40 (L040).
|
Unit |
L040 Value |
|---|---|
|
3100 Series |
1000°F / 537°C |
|
4100 Series |
1200°F / 648°C |
|
5100 Series |
1200°F / 648°C |