Solid State Relay (Ssr) Replacement; Figure 9 Thermocouple - Thermo Scientific BF51841C Operation Manual

2. Remove the back panel of the furnace by removing the appropriate eight hex-
head screws.
3. The thermocouple is located in the upper left hand corner of the rear of the
furnace. Note location and color of the thermocouple and lead wires. Remove
the mounting and connection screws. Carefully pull the thermocouple
assembly out of the furnace chamber.
4. Replace the cylindrical thermocouple section with the new section. Put the
thermocouple assembly back into the furnace chamber. Fasten with the
mounting screws and reconnect wires. Refer to
proper wire connections.
5. Replace the back panel.

Solid State Relay (SSR) Replacement

To replace the solid state relay:
1. Disconnect power to the furnace.
2. Remove the left side panel (facing front) to provide access to the SSR
assembly.
3. Note positions of the wires on the SSR. Disconnect the wires and remove outer
screws. Remove the heatsink and SSR from the furnace.
4. Remove the SSR from the heat sink. Replace with the new SSR and reverse
the above procedure for reassembly.
Thermo Scientific
Figure 9. Thermocouple
Solid State Relay (SSR) Replacement
Figure "Wiring Diagram" for
Maintenance
9-5