Luxaire LM8M, LMLM Technical Manual
TECHNICAL GUIDE
80% MODULATING (PSC MOTOR)
GAS-FIRED RESIDENTIAL
MULTI-POSITION GAS FURNACES
STANDARD & Low NOx MODELS
MODELS: LM8M / LMLM
NATURAL GAS
60 - 120 MBH INPUT
EFFICIENCY
RATING
CERTIFIED
ISO 9001
Certified Quality
Management System
Due to continuous product improvement,
specifications are subject to change without notice.
Visit us on the web at www.york.com for the most
up-to-date technical information.
Additional efficiency rating information can
be found at www.gamanet.org.
402697-LTG-B-1008
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.
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.
5-year limited parts warranty.
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.
FOR DISTRIBUTION USE ONLY - NOT TO BE USED AT POINT OF RETAIL SALE
402697-LTG-B-1008
RIGHT SIDE
23”
24.25”
RETURN END
.5”
.5”
LEFT SIDE
28.5”
30.25”
24.38”
B
20”
Vent Connection
Outlet
Electrical
Entry
Gas Pipe
Entry
Thermostat
Wiring
4” Diameter
Vent Connection
Outlet
C
FRONT
A
33”
Electrical
Entry
Vent
Connection
Outlet
Gas Pipe
Entry
Thermostat
Wiring
B
SUPPLY END
Cabinet and Duct Dimensions
Models
Nominal
CFM (m
3
/min)
Cabinet
Size
LM(8,L)M060A12MP11 1200 A 14 1/2 13 1/4 10.3 94
LM(8,L)M080B12MP11 1200 B 17 1/2 16 1/4 11.8 103
LM(8,L)M080C16MP11 1600 C 21 19 3/4 13.6 114
LM(8,L)M100C16MP11 1600 C 21 19 3/4 13.6 118
LM(8,L)M100C20MP11 2000 C 21 19 3/4 13.6 122
LM(8,L)M120C20MP11 2000 C 21 19 3/4 15.8 129
Cabinet Dimensions (Inches)
Operating Weights
A B C Lbs
14”
1.5”
.5”
.5”
Approximate
1”
Ratings & Physical / Electrical Data
Air Temp.
Rise Max
Input
Models
Input
Max/Min
MBH MBH CFM °F °F
Output
Max/Min
AFUE
Nominal
Airflow
Total
Unit
Amps
LM(8,L)M060A12MP11 60/30 47/24 80.0 1200 7.0 35-65 20-50
LM(8,L)M080B12MP11 80/40 62/32 80.0 1200 7.5 40-70 20-50
LM(8,L)M080C16MP11 80/40 62/32 80.0 1600 10.0 40-70 20-50
LM(8,L)M100C16MP11 100/50 78/40 80.0 1600 10.0 40-70 20-50
LM(8,L)M100C20MP11 100/50 78/40 80.0 2000 17.0 35-65 20-50
LM(8,L)M120C20MP11 120/60 95/48 80.0 2000 17.0 45-75 25-55
Models
Max.
Outlet
Blower
Air Temp
°F HP Amps
Blower
Wheel
size
Max
Over-Current
Protect
Min. wire Size
(awg) @ 75 ft
one way
LM(8,L)M060A12MP11 165 1/3 4.8 11 x 8 15 14
LM(8,L)M080B12MP11 170 1/3 4.8 11 x 8 15 14
LM(8,L)M080C16MP11 170 1/2 7.5 11 x 10 15 14
LM(8,L)M100C16MP11 170 1/2 7.5 11 x 10 15 14
LM(8,L)M100C20MP11 165 1 14.5 11 x 11 20 12
LM(8,L)M120C20MP11 175 1 14.5 11 x 11 20 12
Annual Fuel Utilization Efficiency (AFUE) numbers are determined in accordance with DOE Test procedures.
Wire size and over current protection must comply with the National Electrical Code (NFPA-70-latest edition) and all local codes.
Air Temp.
Rise Min
Input
2 Johnson Controls Unitary Products
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