Reznor SCE 175 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:

E
ericabrownAug 5, 2025
What to do if the Reznor SCE 175 Blower venter motor will not start?
- A
  Alan OrozcoAug 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.
D
Daniel MathewsAug 9, 2025
Why is my Reznor SCE 175 motor turning on and off?
- S
  Sarah DaltonAug 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.
J
Julia HardyAug 14, 2025
What to do if Reznor SCE 175 pilot lights, but the main valve won't open?
- L
  lwoodwardAug 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
Kathryn BennettAug 17, 2025
Why does the Reznor Blower motor cut out on overload?
- E
  erobertsAug 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.
H
heather69Aug 27, 2025
Why is my Reznor SCE 175 not producing enough heat?
- J
  Jason DaltonAug 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.
P
Paul KennedyAug 30, 2025
What to do if the Reznor SCE 175 Blower motor will not run?
- M
  Morgan WadeAug 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 175 Specifications

General

Brand	Reznor
Model	SCE 175
Category	Blower
Language	English

Summary

Important Safety Information

General Safety Warnings

Key safety precautions and warnings for operating the unit.

Installation Procedures

Duct Connection Requirements

Guidelines for connecting supply and return air ductwork to the unit.

Venting and Combustion Air

Requirements for installing the combustion air and vent system.

Specific Venting Pipe Requirements

Details on vent pipe diameter, length, and material requirements.

Venting Joint and Sealing

Step-by-step instructions for sealing vent pipe joints.

Concentric Adapter Box Installation

Instructions for installing the concentric adapter box for venting.

Concentric Adapter Box Pipe Connections

Requirements for connecting pipes to the concentric adapter box.

Venting Options

Horizontal Vent Terminal Kit (Option CC6)

Option CC6 Installation Steps

Detailed steps for installing the horizontal vent terminal and combustion air package.

Vertical Vent Terminal Kit (Option CC2)

Option CC2 Installation Steps

Detailed steps for installing the vertical vent terminal and combustion air package.

Gas Piping and Pressures

Gas Connection Requirements

Specifications and diagrams for connecting the gas supply to the unit.

Manifold Pressure Settings

Checking Valve Outlet Pressure

Electrical Supply and Connections

Combustion Air Proving Switch

Blower Fan Control and Motor Specs

Blower Speed Adjustment

Operating Gas Valve Function

Pilot and Ignition Systems

Pilot Assembly and Flame Sensing

Installation and Startup Checklists

Pre-Startup Installation Checks

Checklist for verifying installation components and safety before startup.

Startup and Post-Startup Procedures

Steps for performing initial startup and post-startup checks.

Service and Maintenance

Operating Gas Valve Maintenance

Procedures for checking and maintaining the unit's gas valve.

Vent/Combustion Air System Maintenance

Burner Rack Maintenance and Cleaning

Cleaning Pilot and Burners

Spark Ignition System Maintenance

Troubleshooting

General Troubleshooting Guide

Table of common symptoms, probable causes, and remedies for unit issues.

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