NOTE - This information is for older models and is not complete! Please use this as a guide.
I ‐ INTRODUCTION
All Lennox product is now set up with a systematic coding system
for both model numbers and serial numbers. Unit model number
(including any dash numbers) and serial number must always be
used when referring a problem to Lennox in regard to repair
parts,literature,
tion numbers and serial numbers will greatly help in expediting
any material required for these products.
II ‐ MODEL NUMBERS
Each unit manufactured is a duplication of a particular model. The
model is identified by a ”model number“ which is stamped on the
unit nameplate or rating plate. On residential gas and oil furnaces
this identification plate is located on the inside of cabinet near the
vestibule panel. On other Lennox products the plate is mounted
on the outside of units.
The sequence of letters and digits in the Lennox model number
reflect specific information about the unit. Figure 1 analyzes three
typical model numbers.
UP FLOW GAS FURNACE — 14 SERIES
G21Q3‐40‐2
SERIES
TONS OF
COOLING
HEAT
CAPACITY
DASH
NO.
CONDENSING UNIT — 22 SERIES
HS26‐311V‐1P
CAPACITY
DASH
NO.
PHASE EXPANSION
VOLTAGE
VALVE
CHARACTERISTICS
SERIES
GAS HEAT/DX COOLING SINGLE PACKAGE UNIT — 16 SERIES
GCS16H‐261‐50‐3P
SERIES
AIR
FLOW
PHASE
COOLING
CAPACITY
HEAT
CAPACITY
DASH
NO.
VOLTAGE
CHARACTERISTICS
A ‐ Letter Code
Table 1 decodes letters or group letters.
B ‐ Number Code
Numerals denote the following information:
1 ‐ The first one or two numbers indicate the series.
EXAMPLE: G21 — Gas Heat, 14 Series
HS26 — Condensing unit, 22 Series.
2 ‐The number following the letter ”D“ or ”Q“ and preceding the
dash indicates air movement capabilities in tons.
EXAMPLE: G21Q3 — ”Q“ denote cooling drive with 3 tons of
cooling.
HS26‐311V — Condensing unit ”31“ capable of
approximately 31,000 Btuh cooling capacity.
Number following nominal cooling indicates the
electrical phase. ”1“ denotes single phase power.
”3” denotes three phase power. ”0” refers to the
general unit, including both single and three phase.
“V“ denotes expansion valve system for cooling.
3 ‐ The next set of numerals following the dash,
indicates thousands of Btuh heating or cooling
capacity.
EXAMPLE: G21Q3‐40 — Gas heating unit capable of 40,000
Btuh input.
sents a minor engineering change in the series unit.
EXAMPLE: G21Q3‐40‐2 — The unit has a minor change, but
not enough to warrant a new series of gas unit.
C ‐ Voltage Coding
Since 1968 all Lennox equipment which operates on voltage other
than 120 volt/60 hertz/1 phase, is labeled with a letter designation
to indicate primary voltage. This designation is the last letter in the
unit model number. See below for voltage coding.
VOLTAGE
CODE
LETTER
VOLTAGE
PHASE
HERT
Z
A . . . . . . . . . . . 230 . . . . . . . . . . . . . . . 1 . . . . . . . . . . . . . 60
B . . . . . . . . . . . 208 . . . . . . . . . . . . . . . 1 . . . . . . . . . . . . . 60
C . . . . . . . . . 230/240 . . . . . . . . . . . . . 1 . . . . . . . . . . . . . 60
D . . . . . . . . . 208/220 . . . . . . . . . . . . . 3 . . . . . . . . . . . . . 60
E . . . . . . . . . 220/240 . . . . . . . . . . . . . 3 . . . . . . . . . . . . . 60
F . . . . . . . . . 440/480 . . . . . . . . . . . . . 3 . . . . . . . . . . . . . 60
G . . . . . . . . . . . 460 . . . . . . . . . . . . . . . 3 . . . . . . . . . . . . . 60
H . . . . . . . . . 550/600 . . . . . . . . . . . . . 3 . . . . . . . . . . . . . 60
J . . . . . . . . . . . 575 . . . . . . . . . . . . . . . 3 . . . . . . . . . . . . . 60
K . . . . . . . . . 208/230 . . . . . . . . . . . . . 1 . . . . . . . . . . . . . 50
L . . . . . . . . . 208/240 . . . . . . . . . . . . . 3 . . . . . . . . . . . . . 60
M . . . . . . . . . 380/420 . . . . . . . . . . . . . 3 . . . . . . . . . . . . . 50
N . . . . . . . . . 220/240 . . . . . . . . . . . . . 3 . . . . . . . . . . . . . 50
P . . . . . . . . . 208/230 . . . . . . . . . . . . . 1 . . . . . . . . . . . . . 60
Q . . . . . . . . . . . 230 . . . . . . . . . . . . . . . 3 . . . . . . . . . . . . . 60
R . . . . . . . . . . . 208 . . . . . . . . . . . . . . . 3 . . . . . . . . . . . . . 60
S . . . . . . . . . . . 550 . . . . . . . . . . . . . . . 3 . . . . . . . . . . . . . 60
T . . . . . . . . . 220/240 . . . . . . . . . . . . . 1 . . . . . . . . . . . . . 50
U . . . . . . . . . 208/240 . . . . . . . . . . . . . 1 . . . . . . . . . . . . . 60
W . . . . . . . . . 200/220 . . . . . . . . . . . . . 1 . . . . . . . . . . . . . 50
X . . . . . . . . . . . 277 . . . . . . . . . . . . . . . 1 . . . . . . . . . . . . . 60
Y . . . . . . . . . 208/230 . . . . . . . . . . . . . 3 . . . . . . . . . . . . . 60
When the coding system originated
merals
pacity. Those numerals are still used today in model numbers to
ments. This is because of varying evaporator coil condensing unit
match-ups, varyi
fined in more general terms by tons of cooling. The following list
equates nominal cooling tonnage to model numbers.
—18 = 1 ton
—21 = 1.5 tons
—26 = 2 tons
—28 = 2 tons
—31 = 2.5 tons
—41 = 3 tons
—46 = 3.5 tons
—51 = 4 tons
—65 = 5 tons
—81 = 6 tons
—95 = 7.5 tons
—135 = 10 tons
—160 = 12.5 tons
—185 = 15 tons
—255 = 18.5 tons
—275 = 20 tons
—300 = 25 tons
—360 = 30 tons
—415 = 33 tons
—600 = 45 tons
There cooling capacity figures also appear in model numbers for
cording to the face area or square inches of the coil. This coding
ries 4 evaporator coil, up‐flow, 495 square inches coil face area.
Form No. 000392
III ‐ SERIAL NUMBERS
Each unit is sent with an individual serial number. Early model
units (before 1968) were date coded with three or four numbers.
The first two indicate the year, with the last numbers indicating the
month of the year. Example: 65‐3 would have been produced in
1965 on the third month.
Units produced between 1969 and 1976 had the serial number
stamped on an identification plate mounted next to the unit name­
plate. Units manufactured prior to 1969 may have the serial num­
ber stamped directly onto the unit nameplate.
Current production has the serial number stamped on a sticker
which is usually located adjacent to the unit nameplate or rating
plate. a duplicate serial numbering system for current Lennox pro­
duction. Each manufacturing facility will start each calendar
month with 00001. This procedure eliminates any two different
products from one manufacturing plant from having the dame seri­
al number.
Each production lot or shop order is to be assigned to consecutive
series of numbers to cover the number of units to be produced in
that particular run.
A record will be kept showing: shop order number, date produced,
and the starting and the ending serial number used on each partic­
ular shop order.
SERIAL NUMBERING SYSTEM
Manufacturing
Site(51)
Year(78) Month(M)
Serial No.
SERIAL NUMBER
5178M 99989
Industries Inc.
MANUFACTURING SITE
Columbus . . . . . . . . 51
Des Moines . . . . . . . 53
Ft. Worth . . . . . . . . . 54
Heatcraft . . . . . . . . . 55
Stuttgart . . . . . . . . . . 56
Marshalltown . . . . . 58
Toronto . . . . . . . . . . 63
MONTH
January . . . . . . . . . . . .
February . . . . . . . . . . .
March . . . . . . . . . . . . .
April . . . . . . . . . . . . . . .
May . . . . . . . . . . . . . . .
June . . . . . . . . . . . . . . .
July . . . . . . . . . . . . . . .
August . . . . . . . . . . . . .
September . . . . . . . . .
October . . . . . . . . . . . .
November . . . . . . . . . .
December . . . . . . . . . .
A
B
C
D
E
F
G
H
J
K
L
M
LETTERS
EXPLANATION
A
B
Aluminized heat exchanger
Blower
C
D
E
LETTERS
EXPLANATION
CAC
Clean air case (high efficiency air filter)
Evaporator coil (up‐flow)
CHA
CHP
Packaged cooling unit
Packaged heat pump
Direct drive blower generally for heating only
CPH
Heat pump coil (horizontal)
Two meanings:
1) Electric heating unit
2) electric ignition (on gas Units)
CMZ
Canadian multizone system manufactured in Canada
DMS
Direct multizone system
F
Filter box
DSS
Direct single zone system
G
Gas heating unit
EAC
Electronic air cleaner
H
Horizontal air flow
ECB
Add‐on electric heat for CB units
M
Mobile home unit
ECH
Add‐on electric heat for CHA and CHP units
O
Oil heating unit
EMD
Economizer damper
Q
Direct drive blower generally for both heating & cooling
FMP
Fuel master plus heat pump auxiliary fossil fuel control
Two meanings:
GCS
Packaged cooling unit with gas heat
GHP
Packaged heat pump with gas heat
R
1) Down flow
2) residential
S
Stowaway unit (horizontal‐flow)
GSR
Gas furnace horizontal or down‐flow
HSW
High side or condensing unit (wall mounted)
V
3 meanings: 1) Expansion valve system cooling units.
2) Vitreous coated gas heat exchanger
3) Variable speed blower motor
HRW
Solar purge coil
LHF
Gas fired rooftop space heater
LHV
Gas fired rooftop heating & ventilating
LLB
Gas fired make‐up air heater
LMU
Gas fired rooftop make‐up air
LSC
Solar collector
LSM
Storage unit
LUF
Oil fired unit heater
OAD
Outdoor air damper
OCS
Packaged cooling unit with oil heat
OHP
Oil burner
PCW
Purge coil water (solar)
RDE
Duct enclosure
RMF
Roof mounting frame
RTD
Step‐down diffuser (combination supply & return)
RTM
Refrigerant transportation module (Zonemaster)
RVZ
Rooftop varizone system
SMS
Solar matched system
SHP
Solar assit heat pump unit
SRT
Supply & return transition
ZDB
Zone damper box—blower operated
W
X
Two meanings:
1) Water coil
2) wide coil cabinet
Gas heating models meet California Nitrogen Oxides
(NOx) Standards
AF
Adapter frame
CB
Coil blower unit
CH
Evaporator coil horizontal‐flow
CP
Heat pump coil
CR
Evaporator Coil down‐flow
DX
Direct expansion (cooling)
ED
Electric duct heater (horizontal or up‐flow)
FC
Full height cabinet cooling coil
FD
Flush diffuser (combination supply & return)
FF
Flared fittings on cooling unit or cooling coil
GH
Gas Furnace horizontal
GS
Gas Furnace horizontal
HP
Heat pump (Outdoor unit)
HS
High side or condensing unit
HW
Hot water coil
IK
Installation kit
LD
Gas duct furnace
LF
Gas space heater
LP
Oil fired industrial heater (horizontal or up‐flow)
MF
Multi‐position air filter
PG
Gas power burner
PV
Power venter
OF
Oil furnace (low boy)
RA
Return air cabinet
RD
Power Saver (damper mixing box)
RL
Relay control center
RP
Readout panel
RY
Duct enclosure
SC
Solar collector
SE
Solar assist electric unit
SG
Solar assist gas unit
SO
Solar assist oil unit
SU
Storage unit
TC
Transport control unit
WD
Drum type humidifier
WS
Spray type humidifier
ZD
Zone damper box
EMDH
Horizontal economizer damper section
HSWC
Water cooled condensing unit
LSHW
LSSH
Solar matched system
LSTM
LSTS
Transport control unit
LSMK
Solar manifold kit
LRDG
Gas fired rooftop duct furnace (hor., gravity vent)
LRDV
Gas fired rooftop duct furnace (hor., power vent)
MCHA
Packaged mobile home cooling unit
MCHP
Packaged mobile home heat pump
REMD
Economizer damper section
U.S. TRADEMARKS/REGISTERED NAMES
NAME
Pulse21
WhisperHeat
POWER SAVER
DIMENSION
EXPLANATION
G21 or GSR21 Gas Furnaces
G20 or G20R Gas Furnaces
Two meanings:
1) HS14 or HP21
2) Outdoor Intake Dampers
HS26 or HP26 Condensing units
FUELMASTER+
FMP Heat pump auxiliary fossil fuel control
HARMONY
Variable Air Volume Zone Control System
FLEXZONE
Dual Zone Control System
Heatwringer
HW2 Reclaim Heat-Water Heater Module
HUMIDIWHEEL
WD1 Power Wheel Humidifier
HUMIDISPRAY
WS1 Spray‐Type Humidifier
DURACURVE
Heat Exchanger for gas Units
RFC
Refrigerant Flow Control
ZONEMASTER
RTM1 with One Two Speed Condensing Unit
supplies Two evaporator units
Compliant Scroll
Copeland Compressor
Aire‐Flo
Breeze Control
Comfort
Craftsman
Duraglass
Duratube
Flame Cushion
Flo‐Vu
Glo‐Ring
Landmark
Nifty Weather
Machines
PS
Perima‐flo
Power Prop
Power Saver
Skymark
Stowaway
Coolmate
Legend
Multi‐Mod
Hi‐Performance
Humiditron
Humidiflo
Humidikleen
Solarmate
Varizone
Conservator
Heatsaver
Powerlite
Outdoor Air
Discriminator
Latent Load
Discriminator
NAME
A.G.A.
A.F.U.E.
ANSI
ARI
EXPLANATION
American Gas Association
Annual Fuel Utilization Efficiency
American National Standards Institute
Air‐Conditioning and Refrigeration Institute
C.O.P.
Coefficient of Performance
C.G.A.
Canadian Gas Association
CSA
Canadian Standards Association
DOE
Department of Energy
EER
Energy Efficiency Ratio
ETL
Electrical Testing Laboratories
FTC
Federal Trade Commission
GAMA
Gas Appliance Manufacturers Association
HSPF
Heating Seasonal Performance Factor
NEC
National Electric Code
SEER
UL
Seasonal Energy Efficiency Ratio
Underwriters Laboratories