The Blender Box® mixing box mixes return and outside air streams so the minimum temperature in the plenum is above the freeze-stat set point.
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Problem
A freeze-stat is a low limit thermostat used to protect hydronic coils. If any portion of the device is exposed to a temperature below the set point, typically 35°F to 40°F, the freeze-stat will trip, shutting down the air handler. A typical response to freeze-stat problems is to shut off the outdoor air supply to eliminate cold air in the mixing plenum. Unfortunately, this solution does not allow the proper amount of ventilation air into the building, thereby compromising the indoor air quality.
Mixing: The Solution
By mixing the cold outside air with the return air, the lowest local mixed air temperature can be increased above the level of the freeze-stat set point before coming in contact with the coil. The result is the elimination of maintenance costs associated with nuisance freeze-stat trips and the repair of frozen coils including the water damage cause by the ruptured coils.
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