TECHNICAL GUIDE
LATITUDE
MODELS: GY8S/LY8S
GAS-FIRED
HIGH EFFICIENCY SINGLE STAGE
UPFLOW/HORIZONTAL FURNACES
STANDARD & LoNOx
NATURAL GAS
40 - 130 MBH INPUT
Due to continuous product improvement, specifica-
tions are subject to change without notice.
Visit us on the web at www.york.com for the most
up-to-date technical information.
Additional information can be found at
www.gamanet.org.
EFFICIENCY
RATING
CERTIFIED
This product was manufactured
in a plant whose quality system
is certified/registered as being
in conformity with ISO 9001.
036-21618-002 Rev. A (1004)
FOR DISTRIBUTION USE ONLY - NOT TO BE USED AT POINT OF RETAIL SALE
DESCRIPTION
These high efficiency, compact units employ induced com-
bustion, reliable hot surface ignition and high heat transfer
aluminized tubular heat exchangers. The units are factory
shipped for installation in upflow or horizontal 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 depend-
able 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.
WARRANTY
20-year limited warranty on the heat exchanger.
10-year heat exchanger warranty on commercial applica-
tions.
5-year limited parts warranty.
FEATURES
• Easily applied in upflow, horizontal left or horizontal right
installation with no conversion necessary
• 100% shut off main gas valve for added safety
• Rollout safety control
• Low unit amp requirement for easy application
• High quality inducer motor for quiet operation
• Built-in self diagnostics with fault code display
• “Diamond Tough”™ hot surface igniter
• High velocity filter provided for field installation
• Standard terminals for controlling humidifiers and EAC's
• 40 VA control transformer fuse protected
• Easy to connect power and control wiring
• Efficiency ratings of 80 AFUE attained by using tubular
heat exchangers
• Cooling relay supplied for easy installation of add-on
cooling
• Multi-speed PSC, direct-drive blower motors to match
cooling requirements
• Adjustable fan-off settings to eliminate “cold-blow”
• Compact 40-in height allows installation in small space
confines
• Lo NOx models have been designed to meet specific
code requirements. Lo NOx units may not be converted
to propane.
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