Micro-Air, Inc. Page 14 EasyTouch Operations Manual
Rev 3.0 4/3/17
9. FRESH AIR MAKEUP (FAMU) OPERATION
A Fresh Air Makeup (FAMU) system is meant to draw in and condition outside air and drive it into the
interior cabin areas. The air drawn in from the outside is considered the “intake”, and the air discharged
into the cabin is considered the “exhaust”. The FAMU unit must condition the outside air in a single pass
through the system. FAMU systems therefore must incorporate both cooling and electric heating.
EasyTouch supports FAMU operation for both DX and CW systems using the FX2 Control Board, rev J and
newer. Please refer to the FX2 Control Board User Manual for further details on how to wire the FX2
control board to a FAMU system (available on the Micro-Air website at this link).
A FAMU system takes warm and moist intake air at temperature T1, dew point DP1, and relative humidity
%RH1, and will first cool and dry the air to a lower dew point DP2 at a temperature lower than the desired
exhaust set point. Then, the FAMU system will reheat the air, increasing only its dry bulb temperature,
further reducing its relative humidity, to temperature T2 and relative humidity %RH2. Please refer chart
shown in Figure 9 for a Psychrometric analysis and overview of how a FAMU system accomplished this
function.
Figure 9 – Fresh Air Makeup (FAMU) Operation & Psychrometric Overview
To Next Page
Loading...
