Originally Posted by
rbalister
OK, if you've removed alot of the original components look at doing the following.
1. Ground TB3-30. Don't send it to +24V, otherwise you'll have to ground the other side of the relay and reverse the snubber diode across the SER coil. In addition, the indicator diode will no longer function.
2. Apply 24VDC to TB3-4, 12, 13.
3. To close the SER relay, momentarily apply 24V to TB3-17, 18.
This will latch SER closed.
Do you plan on using any of the other relays on the control board? If so, that may change the recommendation above.