10
I-EEDU (02-21) 150492-A
INSTALLATION—CONTINUED
Pre-Installation Modifications
High CFM Conversion
This unit was factory assembled with the air throughput range listed on the rating plate . If the application requires
a higher CFM than listed on the rating plate, the unit may be converted for lower temperature rise and higher CFM .
The conversion will change the air throughput range as specified in
. Verify the unit size on the heater rating
plate and, after confirming that this conversion is correct for the unit, perform the following procedure:
⚠ DANGER ⚠
• This conversion shall be done by a qualified service agency in accordance with the manufacturer’s
instructions and all applicable codes and requirements of the authority having jurisdiction. If the
information in these instructions is not followed exactly, a fire, an explosion, or the production
of carbon monoxide may cause property damage, personal injury, or loss of life. The qualified
service agency performing this work assumes responsibility for the conversion of this appliance
to provide for higher CFM.
• These instructions are designed to prepare the duct furnace for increased air throughput conversion
prior to installation. If your duct furnace is already installed, for your safety, turn OFF the gas and
electric supply before servicing.
NOTE: Before performing this conversion, determine if airflow is being reversed or if other field-
installed options apply. Perform desired procedure in accordance with
section.
1. Remove heat exchanger baffles (see
):
a . Remove support bracket screws and slide entire baffle assembly out of heat exchanger .
b . Reinstall screws to plug holes .
c . For unit sizes 075–100, conversion is complete . Proceed to step 3 .
Table 7. High Air Throughput
Unit Size
Minimum
Maximum
CFM
075
855
2778
100
1140
3704
125
1425
4630
140
1595
5185
170
1937
6296
200
2279
7407
225
2564
8333
250
2849
9259
300
3175
11,111
350
3704
12,963
400
4233
14,815
