Install Manual

04/03/2009 8 EI204
Mechanical Installation
Downflow
For downflow installations, model numbers (EH-D**-*) must be used. Upflow models
(EH-U**-*) cannot
be used in this application.
The basic mechanical installation instructions represented above in the upflow mechanical installation section
apply to this section as well. Reference drawing EA111 located in the back of this guide for correct placement of
the HeatChoice unit in downflow applications.
Install the separately packed temperature sensor tube on the supply side of the HeatChoice. (Reference EA111
for correct placement).
Mechanical Installation
Horizontal
For horizontal installations, model numbers (EH-D**-*) must be used. Upflow models
(EH-U**-*) cannot
be used in this application.
Horizontal installations basically involve a downflow unit (EH-D**-*) turned 90° while the general installation
rules common to the upflow unit apply.
The key is to observe the “AIRFLOW” arrow and allowing for gravity temperature rise, making sure there is a
probability for the hi-limits sensing at an upper point in case of airflow failure. Also, all airflow must pass
uniformly through the elements. Feel free to call the factory for additional assistance with horizontal
applications.
Reference previous upflow installation steps, all requirements for plenum sizing and deflectors apply. This
installation could represent a 15” model or an 18” model; again apply the rules outlined above.
Air conditioning coil – typically we are aware of three physical coil types – flat (90° to horizontal duct), slant
coil, and A-coil turned 90° (with an extended drip pan at the bottom). With these three types, the HeatChoice is
typically installed after the coil or on the “supply” side. Again top and bottom and backside deflectors may be
required depending upon plenum size.
- Flat coil – allow at least 8 inches between coil and HeatChoice.
- Slant coil – installing the HeatChoice at the same angle as the coil is preferred, or insert the
HeatChoice as close as possible to the horizontal plenum bottom (assuming this is the furthest
distance between coil and HeatChoice).
- Turned A-coil – similar to an upflow, the HeatChoice must be inserted in line with the A-coil, with
the HeatChoice deflector centered on the inverted “A” and as close as possible to the coil inverted A
“top”.
Insert the HeatChoice unit making sure the center deflector has its point toward the furnace. Verify that the unit
is completely inserted so the air will flow between the element mounting plate and the front panel. Mount the
unit to the plenum.
Install the supplied temperature sensor tube supplied on the supply side of the HeatChoice.