Lennox Harmony III User Manual

16
1.13. Minimum CFM in Variable Speed Furnace and Air
Handlers
Harmony lll™ zoning system minimum CFM values for variable speed furnaces are
listed in the following tables.
These apply to furnaces and air handlers with serial numbers indicating they were
built in 2004 or later. With furnaces built before 2004, use the Harmony II zone
system control system minimum air note in the installation instructions or product
specicationforthatfurnaceorairhandler’sairhandlingdata.
These listed CFM numbers are the lowest the blower can run in order not to tripped
gas furnace limits. .
Table 11. MinimumindoorvariablespeedblowerCFMper
model number (Gas furnace models)
Unit Model
Numbers
CFM (min)
Unit Model
Numbers
CFM (min)
EL296DF090XV60C
EL296DF110XV60C
450 SL280UH135V60D 450
ML180UH030V36A
ML180UH045V36A
ML180UH070V36A
ML180UH070V36B
350
SL297UH040NV36B
SL297UH060NV36B
250
ML180UH110V60C 550 SL297UH080NV48C 380
ML180UH070V48B
ML180UH090V48B
400 SL297UH080NV60C 450
SL280DF070V36A 250
SLP98DF070XV36B**
SLP98DF090XV36C**
250
SL280DF090V48B 380 SLP98DF090XV48C** 360
SL280DF090V60C 450
SLP98DF090XV60C**
SLP98DF110XV60C**
450
SL280UH060NV36A 250
SLP98UH070XV36B**
SLP98UH090XV36C**
SLP98UH090XV48C**
250
SL280UH080NV48B 380 SLP98UH090XV60C** 450
SL280UH080NV60C
SL280UH100NV60C
450
SL280UH070V36A
SL280UH090V36B
250
SL280UH090V48B 380
SL280UH090V60C
SL280UH110V60C
450
Table 12. “MinimumindoorvariablespeedblowerCFM
per model number (Air Handlers)
Unit Model
Number
CFM (min)
Unit Model
Number
CFM (min)
CBA25UHV-018
CBA25UHV-024
CBA25UHV-030
CBA25UHV-036
250
CBX32MV-048**
CBX32MV-068**
450
CBA25UHV-042
CBA25UHV-048
CBA25UHV-060
450
CBX40UHV-024**
CBX40UHV-030**
250
CBA38MV-018/024**
CBA38MV-030**
CBA38MV-036**
250 CBX40UHV-036** 380
CBA38MV-042**
CBA38MV-048**
CBA38MV-060**
450
CBX40UHV-042**
CBX40UHV-048**
CBX40UHV-060**
450
CBX25UHV-018
CBX25UHV-024
CBX25UHV-030
CBX25UHV-036
250
CBWMV-24B-040
CBWMV-36B-070
CBWMV-36C-090
250
CBX25UHV-042
CBX25UHV-048
CBX25UHV-060
450 CBWMV-60C-100 450
CBX32MV-018/024**
CBX32MV-024/030**
CBX32MV-036**
250 CBWMV-60C-120 380
NOTE: Three percent duty cycle corresponds to the minimum CFM, and a 97%
duty cycle corresponds to the maximum CFM.
** Listed values in the table correspond to 0% duty cycle of the Harmony III zoning
system control signal. Since the Harmony III zoning system puts 3% at minimum,
actual value may be 10-30 CFM higher.
NOTE: For discontinued air handlers and furnaces, please refer to the individual
product installation instruction. Minimum CFM values for Harmony III will
be listed at the end of the listed CFM tables.
See“7.AirowData”onpage66forsafeoperationsbasedonloadandsystem
minimum, and maximum CFMs when used with Harmony III.

Lennox Harmony III Specifications

General

Brand	Lennox
Model	Harmony III
Category	Control Systems
Language	English