Thermolec Mini Make Up Air - Manual (Page 2)

Please read instructions carefully before installation.
This unit is a complete fresh air make-up package with an integrated damper system, washable fi lter and fan
with adjustable speed control which allows an easy setup with a minimum of connections. Only one power
connection is required to power the entire unit. Please follow the wiring diagram included under the cover for
specifi c electrical wiring. Thermolec FER mini make up air units are available in sizes up to 20 kW of heat at
voltages ranging from 120V single phase to 600V three phase. Collar sizes range from 6” to 12” with fans ca-
pable of up to 600 CFM. Mini make up air models are specifi ed as follows: FER-collar-kW-voltage/phase, e.g.
a 20kW, 240V (single phase) unit with a 12” collar would be FER-12-20-240/1. For small 6” applications up to
3kW at 240/1 take a look at our THERMO-X-AIR units which include a room controller to control the operation
mode of the integrated fan.
Mechanical installation
Thermolec FER heaters are designed to be installed for horizontal airfl ow only (fi g. 1). DO NOT install unit
vertically
(fi g. 2). This unit is equipped with thermal cutouts on both the top and bottom of the unit which al-
lows it to simply be rotated 180º to change the direction of airflow with no modifications to the fan or wiring, as
seen in fig. 3. The direction of airflow from the fan itself is fixed and cannot be reversed. Before mounting the
unit, determine the direction of airflow required and rotate the unit accordingly.
NOTE:
This unit is designed to preheat fresh air and not reheat ambient air.
For proper airflow, a minimum distance between the unit and any elbow must be observed. This distance
increases as the unit size increases. To determine the proper distance, multiply the collar size of the unit by a
factor of 1.5. For example a unit with a 12” collar would require elbows to be installed at a distance of not less
than 18” (fig. 4). Use round insulated duct for the inlet connection and uninsulated for the outlet while minimiz-
ing the use of elbows. When taking air directly from outside, install the inlet duct at an incline such that conden-
sation or melted snow will not flow into the heater.
Thermal cutout
Thermal cutout
fig. 1
fig. 2
fig. 3
O.K
.
Reversable Airflow
Air
Inlet
Air
Inlet
Controls
Controls
FER
fig. 4
D” x 1.5 D” x 1.5