TECHNICAL GUIDE
80% MODULATING (PSC MOTOR)
GAS-FIRED RESIDENTIAL
MULTI-POSITION GAS FURNACES
STANDARD & Low NOx MODELS
MODELS: YM8M / YMLM
NATURAL GAS
60 - 120 MBH INPUT
Due to continuous product improvement, specifications
are subject to change without notice.
Visit us on the web at www.york.com
Additional rating information can be found at
www.ahridirectory.org
WARRANTY
Lifetime limited warranty on heat exchanger to the original purchaser; a
20-year limited warranty from original installation date to subsequent
purchaser.
10-year warranty on the heat exchanger in commercial applications.
Standard 5-year limited parts warranty.
Extended 10-year limited parts warranty when product is regis-
tered online within 90 days of purchase for replacement or closing
for new home construction.
EFFICIENCY
RATING
CERTIFIED
ISO 9001
Certified Quality
Management System
402695-YTG-C-0409
FOR DISTRIBUTION USE ONLY - NOT TO BE USED AT POINT OF RETAIL SALE
DESCRIPTION
These compact units employ induced combustion, reliable hot
surface ignition and high heat transfer aluminized tubular heat
exchangers. The units are factory shipped for installation in
upflow or horizontal applications and may be converted for
downflow applications.
These furnaces are designed for residential installation in a
basement, closet, alcove, attic, recreation room or garage and
are also ideal for commercial applications. All units are factory
assembled, wired and tested to assure safe dependable and
economical installation and operation.
These units are Category I listed and may be common vented
with another gas appliance as allowed by the National Fuel Gas
Code.
FEATURES
• Modulating heating operation includes:
- Modulating gas valve, inducer and circulating blower.
- Modulating operation from 100% input to 50% input in 1%
increments.
• Easily applied in upflow, horizontal left or right, or downflow
installation with minimal conversion necessary.
• Compact, easy to install, ideal height 33" tall cabinet.
• Blower-off delay for cooling SEER improvement.
• Easy access to controls to connect power/control wiring.
• Built-in, high level self diagnostics with fault code display.
• Low unit amp requirement for easy replacement application.
• All models are convertable to use propane (LP) gas.
• Electronic Hot Surface Ignition saves fuel cost with
increased dependability and reliability.
• 100% shut off main gas valve for extra safety.
• High-efficiency variable speed direct drive motor.
• 24V, 40 VA control transformer and blower relay supplied for
add-on cooling.
• Hi-tech tubular aluminized steel primary heat exchanger.
• Blower door safety switch.
• Solid removable bottom panel allows easy conversion.
• Low NOx models have been designed to meet specific code
requirements.
• Airflow leakage less than 1% of nominal airflow for
ductblaster conditions.
• No knockouts to deal with, making installation easier.
• Movable duct connector flanges for application flexibility.
• Quiet inducer, burner and blower operation.
• Inducer rotates for easy conversion of venting options.
• Fully supported blower assembly for easy access and
removal of blower.
• External air filters used for maximum flexibility in meeting
customers IAQ needs.
• Venting applications - may be installed as a common vent
with other gas-fired appliances.
• Insulated blower compartment for thermal and acoustic
performance.
• 1/4 turn knobs provided for easy door removal.
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