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Reznor SCE 400 - User Manual

Reznor SCE 400
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Revision: I-SCE (09-18) PN207697R9
SEPARATED-COMBUSTION,
PACKAGED FURNACE/BLOWER,
MODEL SCE
INSTALLATION/OPERATION/MAINTENANCE
 ⚠ WARNING ⚠ 
FIRE OR EXPLOSION HAZARD
• Failure to follow safety warnings exactly could result in serious injury, death, or
property damage.
• Be sure to read and understand the installation, operation, and service instructions
in this manual.
• Improper installation, adjustment, alteration, service, or maintenance can cause serious
injury, death, or property damage.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of
this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any phone in your building.
• Leave the building immediately.
• Immediately call your gas supplier from a phone remote from the building. Follow the
gas suppliers instructions.
• If you cannot reach your gas supplier, call the fire department.
Installation and service must be performed by a qualified installer, service agency, or
the gas supplier.
DO NOT DESTROY. PLEASE READ CAREFULLY. KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.
Supersedes: I-SCE (5-15) PN207697Rev8
TABLE OF CONTENTS
IMPORTANT SAFETY INFORMATION .................................................................. 2
GENERAL INFORMATION ............................................................................ 3
Installation Codes ................................................................................. 3
Special Installations (Aircraft Hangars/Garages) .......................................................... 3
Warranty ........................................................................................ 4
INSTALLATION ..................................................................................... 4
Dimensions ...................................................................................... 4
Uncrating/Unpacking ............................................................................... 5
Clearances ....................................................................................... 6
Location ......................................................................................... 6
Weights ......................................................................................... 6
Suspension ...................................................................................... 6
Mounting ........................................................................................ 7

Table of Contents

Questions and Answers

  • C
    craigwilliamsAug 5, 2025
    What to do if the Reznor SCE 400 Blower venter motor will not start?
    • C
      cardenasjoshuaAug 5, 2025
      If the venter motor on your Reznor Blower isn't starting, here are a few things you can check: * First, make sure the power to the furnace is on and check the supply fuses or circuit breaker. * Next, verify that there is 24-volt power to the venter relay. Turn up the thermostat and check the control transformer output. Also, check for any loose or improper wire connections. * If power is available and the connections are good, the venter relay, motor, or capacitor might be defective and need replacement.
  • C
    Crystal RyanAug 9, 2025
    Why is my Reznor Blower motor turning on and off?
    • A
      Amanda WatsonAug 9, 2025
      If your Reznor Blower motor is turning on and off, it could be due to the motor overload device cycling. Verify the motor load against the motor rating plate. If necessary, replace the motor or overload device. Also, if you have a 3-phase motor, ensure it is rotating in the correct direction by interchanging two legs of the supply connections.
  • E
    evillegasAug 13, 2025
    What to do if Reznor Blower pilot lights, but the main valve won't open?
    • C
      Caleb SmithAug 13, 2025
      If the pilot light is on but the main valve of your Reznor Blower won't open, try the following: * Ensure the manual valve is open. * Check for defective valve. If 24-volt power is measured at the valve connections and valve remains closed, replace the valve. * Inspect and tighten all wiring connections. * Make sure the flame sensor lead is not grounded and that the insulation or ceramic is not cracked; replace as required. * If all checks indicate no other cause, replace the ignition controller.
  • C
    Cindy BaileyAug 17, 2025
    Why does the Reznor SCE 400 Blower motor cut out on overload?
    • A
      Ashley BarrettAug 17, 2025
      If the motor on your Reznor Blower cuts out on overload, it could be due to a few reasons: * The motor pulley may not be properly adjusted. * There might be improper static pressure on the duct system, so adjust the dampers. * Also, check the power supply for low voltage.
  • B
    Brian RossAug 27, 2025
    Why is my Reznor Blower not producing enough heat?
    • W
      William DiazAug 27, 2025
      If your Reznor Blower isn't providing sufficient heat, consider the following: * Dirty filters in the blower system can restrict airflow, so clean or replace them. * Limit control cycling can also affect heating performance, so check the air throughput. * Ensure that wiring connections are in accordance with the wiring diagram. * The fan control could be defective and require replacement. * If the blower is set for too low a temperature rise, decrease the blower speed or increase static pressure.
  • M
    Michael HoltAug 30, 2025
    What to do if the Reznor SCE 400 Blower motor will not run?
    • A
      Amanda SpencerAug 30, 2025
      If the motor in your Reznor Blower isn't running, check the following: * Inspect the wiring and connections for any open circuits. * Replace the fan control if it's inoperative. * Ensure that wiring connections are in accordance with the wiring diagram. * Replace the contactor if it is inoperative. * If none of the above steps work, the motor may be defective and require replacement.
  • A
    Adam RomeroNov 21, 2025
    Why won't the pilot light on my Reznor SCE 400 even with the venter operating?
    • R
      Robert ClarkNov 21, 2025
      If the pilot light on your Reznor Blower won't light even when the venter is operating, consider these potential causes: * Ensure the manual valve is open. * Bleed the gas line to remove any air. * Clean the pilot orifice with compressed air or solvent to remove any dirt. * Check for kinked pilot tubing and replace if necessary. * If 24-volt power is available at the pilot valve and it doesn't open, replace the valve. * Make sure all wire connections are solid. * Ensure that 24-volt power is available by checking for transformer failure. * Maintain the spark gap at 0.100 inch. * Replace the spark cable if it's shorted to ground. * Replace the pilot if the ceramic spark electrode is cracked or grounded. * Ensure all panels are in place and tightly secured to prevent d...

Summary

Safety Information and Warnings

Fire or Explosion Hazard

Critical safety warning regarding fire and explosion risks associated with the appliance.

Gas Leak Procedures

Step-by-step instructions for handling gas leaks.

Hazardous Atmospheres Warning

Appliance is not designed for hazardous atmospheres, including flammable vapors or dust.

General Information and Installation Overview

General Information and Codes

Unit details and installation code compliance.

Physical Specifications

Unit dimensions, clearances, weights, suspension, and mounting.

Venting and Ducting

Duct Connections

Guidance on connecting and installing ductwork.

Venting and Combustion Air

Vent system installation, hazards, and adapter box details.

Venting Options

Details on horizontal and vertical venting configurations.

Gas and Electrical Systems

Gas Piping and Pressure Requirements

Gas supply, pressure testing, connections, and sizing.

Electrical Supply and Connections

Wiring, supply, and connection requirements.

Controls, Operation, and Maintenance

Control Systems and Operation

Thermostats, switches, valves, blower, and modulation controls.

Burner and Ignition Systems

Burner operation, pilot, and ignition system details.

Service and Maintenance Procedures

Guidelines for routine maintenance of key components.

Startup, Troubleshooting, and Record

Installation and Startup Checklists

Pre-startup, startup, and post-startup procedures.

Troubleshooting Guide

Diagnostic steps for common unit issues.

Installation Record

Installer details and installation notes.

Reznor SCE 400 Specifications

General IconGeneral
BrandReznor
ModelSCE 400
CategoryBlower
LanguageEnglish

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