I recently acquired an Omega D-II enlarger for free from a very kind man who offered it up to a good home. The enlarger came with an Aristo Cold Light head (which im assuming has v54 lamp due to it working very well with VC paper) installed and I'm wonder about the usage of the heater part of the unit.
Aristo mentions keeping it running 5-10minutes before usage, and that it "should be left on continuously for the duration of any day or working session."
The wording on that line is a bit confusing to me, 'duration of any day'.
Does this imply it is better or safer to leave it on even when its not in use or expected to be used? While thats not my main question it leads me to what I really wanted to ask:
Is it safe (or suggested?) to leave the heater running overnight or for periods of time I do not expect to use the head? There are times I can imagine accidently leaving the unit plugged in..
What are your habits of use with this function? Any problems or issues youd care to share relating to the thermostat?
As of right now I've been plugging the heater unit in as I mixed chemicals, filled trays found negatives to print etc.. about 10 minutes, did my printing session (usually 2 or 3 hours) then unplugging the heater unit.