REZNOR SC-100 High CFM Conversion Kit

Specifications

• Model: SC
• CFM Range: 980 CFM – 14,815 CFM
• Conversion Kit PN: 263309
• Components: Limit control, Field conversion label

If the duct furnace is already installed, turn OFF the gas and electric before servicing.

• Revision: SC-HI-CFM (11-24) 263311-B
• Supersedes: SC-HI-CFM (05-22) 263311-A

HIGH CFM CONVERSION KIT INSTALLATION FOR SEPARATED-COMBUSTION INDOOR GAS-FIRED DUCT FURNACE

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, explosion or production of carbon monoxide may result causing 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.

GENERAL INFORMATION

• The instructions in this sheet are designed to prepare a Reznor duct furnace for increased air throughput conversion prior to installation.
• Refer to the installation manual provided with the heater for important safety information.
• The purpose of this kit (PN 263309) is to convert a model SC unit for use in an application that requires a higher CFM than the standard unit. Installation of this kit will allow for use of the furnace with the CFM range listed in Table 1.

Table 1. High Air Throughput
Unit Size	Minimum	Maximum
	CFM
100	980	3700
125	1230	4630
150	1480	5555
175	1725	6480
200	1975	7405
225	2220	8330
250	2465	9255
300	2960	11,110
350	3455	12,900
400	3950	14,815

COMPONENTS

Ensure that all components listed in Table 2 are available before beginning installation.

Table 2. High CFM Conversion Kit (PN 263309) Components
Component	Description	PN (Quantity)
Limit control	145°F, blue label	50418 (1)
Field conversion label	High CFM conversion	263310 (1)

INSTALLATION

Install the high CFM conversion kit as follows:

1. If unit is already installed, turn OFF gas and electric power.
2. Replace limit control (see Figure 1):
   1. Remove control compartment panel, open electrical box, and locate existing limit control
   2. Mark and disconnect limit switch wires, remove screws that secure limit control, and remove control.
   3. Install replacement limit control from kit and secure using existing screws.
   4. Reconnect limit switch wires.
3. Remove heat exchanger baffles (see Figure 2):
   1. Remove support bracket screws and slide entire baffle assembly out of heat exchanger.
   2. Reinstall screws to plug holes.
   3. For unit size 100, conversion is complete. Proceed to step 5.
4. Remove side finger baffles on unit sizes 125–400 (see Figure 3):
   NOTE: DO NOT remove the side finger baffles on unit size 100.
   1. At entering air side of heat exchanger, locate side finger baffles and remove two side finger baffle screws from each baffle.
   2. Remove both side finger baffles.
5. Install field conversion label (see Figure 4):
   1. Fill in field conversion label (PN 263310) from kit.
   2. Adhere label to unit on clean dry surface adjacent to rating plate.
6. Test unit for proper operation ensuring that air throughput is in accordance with Table 1.

Specifications and illustrations subject to change without notice or incurring obligations. Latest version of this manual is available at www.reznorhvac.com.

©2024 Reznor LLC, O’Fallon, MO. All rights reserved. SC-HI-CFM (11-24) 263311-B

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FAQ

Q: What should I do if any components listed in Table 2 are missing?
A: Ensure all components are available before starting the installation process. Contact customer support if any parts are missing.

Q: Can I install the high CFM conversion kit without professional help?
A: It is recommended to seek professional assistance for installing the high CFM conversion kit to ensure proper installation and safety.

Documents / Resources

REZNOR SC-100 High CFM Conversion Kit [pdf] Owner's Manual SC-100, SC-125, SC-150, SC-175, SC-200, SC-225, SC-250, SC-300, SC-350, SC-400, SC-100 High CFM Conversion Kit, SC-100, High CFM Conversion Kit, CFM Conversion Kit

References

• User Manual