Mechanical Installation - Electro Industries EM-WE1025H Installation Manual

NOTE: When installing or mounting this duct heater within four feet of the blower outlet, the following steps
must be followed as detailed and shown in the appropriate drawing. This is necessary because the
airflow from the blower outlet, A-coil, T-Duct, elbows, etc., is very non-uniform. The elements
themselves must be centered over the blower opening width (wheel width) and the element rack must
be in line with the blower outlet outer edge, see Figure 2.
MODELS: EM-WE****H&L
Depending upon access and blower size, there are three possible insert locations. All reference is viewing the
blower wheel end as shown on Figure 3.
These blower arrangements are detailed and shown for UPFLOW and horizontal installations.
1. Blower End, Reference Figure 3 – only use model number last digit "H". As shown on the drawing, the
element rack right edge must line up with the blower outlet right edge. There shall be no opportunity for
air to pass by the element rack on the right. Basically the blower opening or plenum width (area to the
left of the element rack) is of little or no concern. All of the air coming off of the blower wheel is in the
first 4 to 6 inches on the outer scroll of the blower.
The control box back edge must line up with the blower opening edge. This is shown on Figure 3 with
the reference "in line". If the plenum section in which the Electro-Duct is inserted is larger than the
blower opening so that this "in line" cannot take place, do not use this method of installation.
If the plenum depth (area behind the elements) is larger than about 11 inches, a V deflector will be
required in the back of the plenum. See Figure 1 for examples of field constructed V deflector.
2. Insertion Over Blower, Reference Figure 2 – this is the preferred installation method if the blower width
(wheel width) is 8 to 10 inches for the "H" model or 14 to 16 inches for the "L" model. Of greater
concern is the opening depth (element rack length). The element rack must touch the back of the plenum
when inserted.
Again, if the plenum is larger than the blower opening, this method may not work without V deflectors as
shown on Figure 1.
3. Insertion from the Blower Back – this is opposite from Figure 2 where the control box edge would line up
with the blower back outlet edge. Also with this method, the elements are centered on the wheel width
and the hi-limit panel must be in line with the blower edge. Typically the blower opening depth (element
rack length) is of little concern because all the air coming off of the blower wheel is at the scroll outer
edge.
Plenums Larger Than Element Rack – whenever the plenum or duct is larger than the element rack, field
constructed or factory optional starter plenum is available or V deflectors are required to force the air through
the element rack. Figure 1 is to be considered an example. This internal deflector must be complete and
installed as shown. Do not simply use "an angled piece of tin". You must have the top section carried back to
the side of the plenum to prevent eddy currents. Basically the installer is simply providing an internal scoop
with the outer edge lined up with the bottom element. This will direct the air properly through the element rack.
NOTE: The airflow must be in the direction of the decal airflow.
MODEL: EM-WE****C
This model includes starter plenum. Position over the blower outlet with the blower discharge at the plenum
right (facing Electro-Duct control box). In other words, when facing the control box, you will also be looking
at the blower motor end.
06/07/2016

MECHANICAL INSTALLATION

3 EI508