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MODEL NUMBER NOMENCLATURE
581A155, 180, 181 — 13 to 15 Tons
MODEL NUMBER NOMENCLATURE
581A210-300 — 18 to 25 Tons
*See pages 212 and 213 for cooling capacity tables for 581A181 unit. For all other data,
contact application engineering.
NOTE: All indoor-fan motors 5 hp and larger meet the minimum efficiency requirements
as established by the Energy Policy Act of 1992 (EPACT) effective October 24, 1997.
The example model number: 581AEV180230--CB designates a 15 ton 460-3-60 high
efficiency gas/electric rooftop unit with 230,000 Btuh natural gas input, EconoMi$er IV
and standard, low-medium fan drive static capability.
581A E V 180 230 – – C B
581A – Single Package
High Efficiency Gas/Electric Unit
Nominal Tons
155 – 13 Tons
180
181
–
–
15 Tons
15 Tons with hot gas reheat*
Voltage Designation
E – 460-3-60
P – 208/230-3-60
T – 575-3-60
Fuel and Control Type
V–Natural Gas/Electric Relight Pilot
Fan Drive Position
(Standard Motor)
B–Standard Low-Medium
Fan Drive Static
Capability
D–Alternate High Fan
Drive Static Capability
Factory-Installed Outdoor-Air
and Other Upgrade Options
C–EconoMi$er IV
H–Manual Outdoor-Air Damper
Gas Heat Input (Btuh)
230 – 230,000
275 – 275,000
300 – 300,000
360 – 360,000
Design Series Change
a48-8194