Reznor SCE 125 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:

S
Steven PalmerAug 5, 2025
What to do if the Reznor SCE 125 Blower venter motor will not start?
- S
  Stephanie SullivanAug 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.
K
kesparzaAug 9, 2025
Why is my Reznor Blower motor turning on and off?
- R
  Richard RamirezAug 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.
S
Sara MillerAug 14, 2025
What to do if Reznor SCE 125 pilot lights, but the main valve won't open?
- T
  Tracy HernandezAug 14, 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.
K
Kim DavisAug 18, 2025
Why does the Reznor Blower motor cut out on overload?
- R
  Rebecca WilliamsAug 18, 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
Brad ParkerAug 27, 2025
Why is my Reznor Blower not producing enough heat?
- G
  Glenn SantiagoAug 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
Matthew BeardAug 30, 2025
What to do if the Reznor SCE 125 Blower motor will not run?
- M
  Michael AriasAug 31, 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 125 Specifications

General

Model	SCE 125
Heating Capacity	125, 000 BTU/hr
Phase	1
Efficiency	80%
Airflow	1200 CFM
Gas Type	Natural Gas
Motor HP	1/2 HP

Summary

IMPORTANT SAFETY INFORMATION

INSTALLATION

CLEARANCES

Specifies minimum safe distances to combustible materials for safe operation.

DUCT CONNECTIONS

VENTING AND COMBUSTION AIR

Instructions for installing the combustion air and exhaust vent system.

Horizontal Vent Terminal/Combustion Air Package Kit (Option CC6)

Installation instructions for the horizontal venting option.

Vertical Vent Terminal/Combustion Air Package Kit (Option CC2)

Installation instructions for the vertical venting option.

GAS PIPING AND PRESSURES

Guidelines for gas supply connections, pressure testing, and manifold pressure.

ELECTRICAL SUPPLY AND CONNECTIONS

Requirements for wiring, voltage, and electrical connections to the unit.

CONTROL THERMOSTAT

BLOWER FAN CONTROL

OPERATING VALVE

Information on the function and safety of the unit's operating gas valve.

PILOT AND IGNITION SYSTEMS

Details on the pilot system, ignition, and flame sensing.

BURNERS, BURNER ORIFICES, AND CARRYOVER SYSTEM

INSTALLATION AND STARTUP CHECKLISTS

PRE-STARTUP CHECKLIST: INSTALLATION CHECKS

Pre-startup checks related to unit installation, suspension, and clearances.

PRE-STARTUP CHECKLIST: ELECTRICAL CHECKS

Pre-startup verification of electrical supply, wiring, and circuit protection.

PRE-STARTUP CHECKLIST: GAS SUPPLY CHECKS

Pre-startup checks for gas piping leaks, pressure, and air bleeding.

STARTUP CHECKLIST

POST-STARTUP CHECKLIST

SERVICE AND MAINTENANCE

OPERATING GAS VALVE MAINTENANCE

VENT/COMBUSTION AIR SYSTEM MAINTENANCE

CLEANING PILOT AND BURNERS

SPARK IGNITION SYSTEM MAINTENANCE

TROUBLESHOOTING

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