Reznor HIGH CFM CONVERSION KIT INSTALLATION

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.

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

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

COMPONENTS

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

DO NOT DESTROY. PLEASE READ CAREFULLY. KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.

INSTALLATION

Install the high CFM conversion kit as follows:

Step 1: Power Off

If unit is already installed, turn OFF gas and electric power.

Step 2: Replace Limit Control

a. Remove control compartment panel, open electrical box, and locate existing limit control.

b. Mark and disconnect limit switch wires, remove screws that secure limit control, and remove control.

c. Install replacement limit control from kit and secure using existing screws.

d. Reconnect limit switch wires.

Figure 1: Illustration showing the electrical box in the control compartment with the limit control highlighted.

Step 3: Remove Heat Exchanger Baffles

a. Remove support bracket screws and slide entire baffle assembly out of heat exchanger.

b. Reinstall screws to plug holes.

c. For unit size 100, conversion is complete. Proceed to step 5.

Figure 2: Diagram illustrating the removal of heat exchanger baffles, indicating support bracket screws and baffles.

Step 4: Remove Side Finger Baffles (Unit Sizes 125–400)

NOTE: DO NOT remove the side finger baffles on unit size 100.

a. At entering air side of heat exchanger, locate side finger baffles and remove two side finger baffle screws from each baffle.

b. Remove both side finger baffles.

Figure 3: Photograph showing the side finger baffles within the heat exchanger, with screws indicated for removal.

Step 5: Install Field Conversion Label

a. Fill in field conversion label (PN 263310) from kit.

b. Adhere label to unit on clean dry surface adjacent to rating plate.

Figure 4: Image of the field conversion label. The label includes fields for date, maximum and minimum CFM throughput (in English and French: "cfm maximum throughput / pi³/min consommation maximum", "cfm minimum throughput / pi³/min consommation minimum"), the converting company's name and address, and the kit number (263309). It also contains text stating the company accepts responsibility for the conversion (in English and French: "which accepts the responsibility that this conversion has been properly made. / qui accepte la responsabilité que cette conversion a été correctement faite.").

Step 6: Test Unit

Test unit for proper operation ensuring that air throughput is in accordance with Table 1.