Wifi Relay Not linked to NodeRed

I have mounted two relay units to control 2 1KW sections of our water heater. I had the one relay controlling from NodeRed but not the second. I changed a setting in node section of NodeRed and have been trying to make it all work without any luck since.
Question is:
What settings are required in CodeRed to communicate with the Wifi MQTT relay in the WQTT out node especially the topic name?
In the Relay Settings I have:
Device ID emonRelay1
Subscribe topin : emon/heating/control/#
Publish topic : emon/heating/status/

Many thanks