The small drum-shaped lamp housing is a cold light. You set the enlarger to the 5x4 lamp position to use that one for all formats. If you use variable contrast paper expect some limits on your grade range. The standard condenser head needs to be set to the right height for the format. It looks like the scale is missing on the chassis in the picture - it screws in to the right front of the lamp stage. You can get the height for smaller formats by raising the lamp, focusing the image, and repeat until the light circle is just larger than the frame. For 35mm it should be about fully extended.
I retired my cold light a few years ago.