Rheem CLASSIC 90 PLUS User Manual

FORM NO. G11-502 REV. 1
Supersedes Form No. G11-502
GAS FURNACES
RGTC- SERIES
Models with Input Rates
from 45,000 to 105,000 BTU/HR
[13.19 to 30.77 kW]
(All Models up to 95% A.F.U.E.✝)
CLASSIC
®
90 PLUS
95% A.F.U.E.
DOWNFLOW/
HORIZONTAL
GAS FURNACES
The Rheem Classic
®
90 Plus High Efficiency line of down-
flow/horizontal gas furnaces are designed for utility rooms,
closets, alcoves, attics or crawl spaces. The RGTC is
shipped in the downflow configuration and is easily con-
verted for horizontal left-hand airflow applications.
The design is certified by CSA.
Features
■ Heat exchanger is constructed of all stainless steel for
maximum corrosion resistance and thermal fatigue
reliability.
■ Low profile “34 inch” design is lighter and easier to han-
dle and leaves room for optional accessories.
■ Top electrical connections, left or right gas and conden-
sate drainage connections on downflow models.
■ Condensate drain for horizontal application provided
standard.
■ Integrated control board manages all operational func-
tions and provides hookups for humidifier and electronic
air cleaner.
■ An insulated blower compartment, a slow-opening gas
valve and a specially designed inducer system make it
one of the quietest furnaces on the market today.
■ Pre-paint galvanized steel cabinet.
■ Molded permanent filters.
■ Optional indoor or outdoor combustion air.
■ Transformer and control fuse protection.
■ Control board diagnostics.
A variety of cooling coils and plenums designed to use with
the Classic
®
90 Plus gas furnaces are available as optional
accessories for air conditioning models.
✝A.F.U.E. (Annual Fuel Utilization Efficiency) calculated in accordance with Department
of Energy test procedures.
“Visit www.Rheem.com
for complete details.”

Rheem CLASSIC 90 PLUS Specifications

General

Fuel Type	Natural Gas
Ignition System	Direct Spark Ignition
Heat Exchanger Material	Aluminized Steel
Stages	Single Stage
Blower Motor	Multi-Speed
Blower Motor Type	PSC
Heating Capacity	40, 000 - 120, 000 BTU/h
Warranty	10-Year Limited Warranty on Heat Exchanger, 5-Year Limited Warranty on Parts

Summary

Rheem Classic 90 Plus Features

Stainless Steel Heat Exchanger

High-grade stainless steel for superior corrosion resistance and thermal reliability.

Low Profile and Compact Design

34-inch height facilitates easier handling and installation, providing space for accessories.

Flexible Connection Options

Top electrical connections, with left/right gas and condensate ports on downflow models.

Integrated Control and Diagnostics

Manages furnace functions and includes control board diagnostics for troubleshooting.

Quiet and Efficient Operation

Features insulated blower compartment and inducer system for reduced noise.

Durable Cabinet and Filter System

Pre-painted galvanized steel cabinet and molded permanent filters for longevity.

Optional Air and Protection Features

Includes options for combustion air and protection like transformer/fuse.

Standard and Optional Equipment

Included Standard Components

Details the comprehensive list of standard equipment integrated into the furnace.

Optional Equipment and Conversions

Covers optional accessories and conversion kits, including LP gas operation.

Product Specifications and Warranty

Model Identification System

Explains the alphanumeric coding used to identify different furnace models.

Limited Warranty Terms

Outlines the warranty periods for heat exchangers and parts based on registration.

Downflow Model Dimensions and Clearances

Downflow Installation Clearances

Specifies minimum required clearances for installing the furnace in a downflow configuration.

Horizontal Model Dimensions and Clearances

Horizontal Installation Clearances

Specifies minimum required clearances for installing the furnace in a horizontal configuration.

Blower Performance and Accessories

RGTC Blower Performance Data

Table detailing CFM and static pressure for various RGTC models and blower speeds.

Downflow Accessory Kits

Lists essential accessories like vent kits, plenum adapters, filter racks, and floor bases.

Specialty Kits and Notes

Includes fossil fuel kits, high altitude notes, and alternate condensate drain kits.