Desert Aire SA Series, Installation And Operation Manual

Page: 18 / 80

18
contacts to control the field-supplied exhaust blower. Figure 8 shows typical ducting for
an outdoor SelectAire™ unit configured for Outdoor Air with Damper and Filter.
Figure 8 - Outdoor Dehumidifier with Filter and Damper Module
The outdoor air duct used for options 1 and 2 must be insulated to prevent condensation
from forming on it during the winter. Since cold outdoor air can cause moisture to
condensate and freeze on surfaces when it mixes with the warm, humid return airstream,
you must preheat the outdoor air whenever possible.
2.2.2 Units with Exhaust Air Energy Recovery
There are two possible configurations for units containing Exhaust Air Energy Recovery:
1. An indoor SA unit with Exhaust Air Energy Recovery contains a module which handles
outdoor makeup air and exhaust air. This factory-installed module includes filters,
dampers, actuators, and an exhaust blower. This module has flanged openings for the
outdoor and exhaust air ducts. The ductwork and louvers must be field-supplied. The
humid exhaust air may form an icy fog when it blasts outside during the winter. Install the
outlet grille in a location where this fog will not damage the building or create a safety
hazard. Figure 9 shows typical ducting for an indoor SelectAire™ unit configured for
Exhaust Air Energy Recovery.
Desert Aire - SA Manual