Reznor SCE 400 User Manual

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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.

Reznor SCE 400 Specifications

General

Brand	Reznor
Model	SCE 400
Category	Blower
Language	English

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.

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