Originally Posted by Spotty
You don't need to purge the V3 it does it automatically. It's definitly on the diesel side, The module will not switch over until heat and pressure are present, 5 minutes of idle time is not enough for heat to be present.
Yes and no. It will purge automatically, but the system will try and fail to turn itself on a few times but when it fails to pressurize it will shut off and try again. For first system setup it think it was recommanded in the installation manual to hold the purge switch for 1 min to prime the pump, and switches in the V3 module. Also if you are trying to do an initial pressure test, you can run the system on manual regardless of temp by selecting the down position of the system switch which overides the temp sensor.