Make-Up Air Installation Manual

11/23/2011 1 EI904
General
This is a packaged electric element section, using finned rod elements, with a remote sensing control package
for modulating the electric elements.
The typical installation arrangement is shown in FIGURE 1.
The element power is standard 240-volt, single phase. Control is simply supplying the two control wires
with 24 volts to turn the unit on.
Caution: The control contact mechanism for supplying 24 volts to the yellow and black wires must
have interlocking devices to assure airflow and the proper opening of any motorized dampers. This
unit depends upon an external blower or air moving device providing minimal airflow across the
electric elements before “turning the unit on”. Minimum airflow relates to temperature rise needs or
design, Table 2 – CFM Chart, provides these CFM numbers.
FIGURE 1
Table 1 Electrical Requirements
Model kW* Btu/h
Nameplate
Current*
Duct Collar
EM-WX0212R 2.5 8,500 10.5 8”
EM-WX0515R 5 17,000 21 8”
EM-WX1025R 10 34,000 42 10”
* Based upon full turn-on or 100% modulation.
Table 2 CFM Chart
Temperature Rise Needed 80 70 60 50 40 30
Model number
Watts CFM CFM CFM CFM CFM CFM
EM-WX0212R 2500 99 113 132 158 198 263
EM-WX0515R 5000 198 226 263 316 395 527
EM-WX1025R 10000 395 452 527 632 790 1054