i certainly don't mean to be sarcastic, but you've assembled a bicycle without the front tire. without a thermostat connected, the magnum has nothing to 'key' off for temperature control. the recommended starting point for the control box is 4-12-2, and there's also the damper on the combustion blower to adjust to fine tune the stove, along with the feed rate adjuster. do you have a barometric damper installed so a percentage of your heat is not being sucked up the chimney?
once your thermostat is installed, contact your dealer to come out & adjust these variables so your unit is running efficiently.