Make-Up Air Installation Manual

11/23/2011 3 HI309
5. If there is a need to insulate this duct section for moisture condensation or in an unheated
compartment, it is permissible to wrap insulation around the exterior of this metal duct section.
6. The control box must be positioned so it will not receive water dripping or collection of moisture.
7. See next section on duct sensor installation.
BOOST HEAT INSTALLATION
This section applies to any warm air duct or inlet/outlet of an air-to-air (HRV) heat exchanger. Also
can be applied for fresh air inlets such as hood vents, small commercial fresh air, makeup air, etc.
Duct size needs to be approximately the size of the electric element rack. If the duct is more than
approximately 2 inches larger for either depth or width, baffling is required. See drawing HH313 for
the single element product or HH315 for the dual element, 10KW product.
1. Air-to-air heat exchanger – install the electric element rack within the discharge duct of the heat
exchanger.
2. Distribution duct, boost heater – install the electric element rack within the air flow duct,
locating a position to cause a majority of the forced air through the electric elements. If the
distribution duct has a depth of 16” or more, we strongly suggest using the “L” model with the 8”
x 16” element rack.
MAKE-UP AIR
Typically in this application outside air enters the inlet and this module gets used to bring up
the mechanical ventilation temperature. You will probably want to use “C” chip, see next
page. Use the following chart to provide additional temperature rise information.
CFM CHART
Temperature Rise Needed 80 70 60 50 40 30
Model Number
Watts*
CFM
CFM CFM CFM CFM CFM
EM-WC0515H 4800 189 216 252 302 378 504
EM-WC0515L 4800 189 216 252 302 378 504
EM-WC1025L 9600 378 432 504 604 756 1007
*At maximum capacity, duct sensor reduces watts as required.
TEMPERATURE RISE COMMENTS
Typically the maximum temperature rise for this product is 40°F for room air inlet or 20°F for
elevated supply temperature from a typical heat pump.
If it is air make-up, outside air, larger temperature rises are permissible, see table above.
INSTALLATION
1. Locate the appropriate location where this element will temper all the air going to the room
registers or distribution ducting.
2. Cut an 8.5” x 2” slot in the warm air plenum/duct.
3. Control box orientation is not critical.
4. Install duct sensor 2 to 4 air flow feet on the warm side of this module. Select a location where
there is good air mixing.