18
ARI* CAPACITY RATINGS — 581A155,180
LOW HEAT UNITS
HIGH HEAT UNITS
LEGEND
*Air Conditioning and Refrigeration Institute.
NOTES:
1. Rated in accordance with ARI Standards 360 and 270.
2. ARI ratings are net values, reflecting the effects of circulating fan
heat.
3. Ratings are based on:
Cooling Standard: 80 F db, 67 F wb indoor entering-air tempera-
ture and 95 F db air entering outdoor unit.
IPLV Standard: 80 F db, 67 F wb indoor entering-air temperature
and 80 F db outdoor entering-air temperature.
4. All 581A155, 180 units are in compliance with ASHRAE 90.1-
1999 Energy Standard for minimum EER requirements. Refer to
state and local codes or visit the following website: http://bcap-
energy.org to determine if compliance with this standard pertains
to a given geographical area of the United States.

HEATING CAPACITIES AND EFFICIENCIES — 581A155-180

*All units are 2-stage heat.
†Minimum heating cfm must be maintained to ensure proper heating operation.
NOTE: Minimum allowable temperature of mixed air entering the heat exchanger during first stage
heating is 45 F. There is no minimum mixed-air limitation during second-stage heating. For entering
air temperatures below 45 F, both stages of heat must be energized together to minimize conden-
sation issues and ensure proper unit operation. Mixed air below 35 F optional stainless steel heat
exchangers are recommended.

LOW OUTDOOR AIR TEMPERATURE

COOLING OPERATION LIMITS AIR QUANTITY LIMITS (Cooling)

UNIT
581A NOMINAL
TONS
NET COOLING
CAPACITY
(Btuh)
TOTAL
WATTS EER SOUND
RATING
(dB) IPLV
155230 13 134,000 12,209 10.60 88 11.4
180275 15 180,000 17,064 10.50 88 11.4
UNIT
581A NOMINAL
TONS
NET COOLING
CAPACITY
(Btuh)
TOTAL
WATTS EER SOUND
RATING
(dB) IPLV
155300 13 134,000 12,218 10.60 88 11.4
180360 15 180,000 17,179 10.50 88 11.1
dB — Sound Levels (decibels)
db — Dry Bulb
EER — Energy Efficiency Ratio
IPLV — Integrated Part-Load Values
wb — We t Bulb
UNIT 581A HEATING
INPUT (Btuh)
Stage 2/Stage 1*
OUTPUT
CAPACITY
(Btuh)
TEMPERATURE
RISE (F)
AGA STEADY
STATE
EFFICIENCY (%)
MINIMUM HEATING
CFM†
155230 230,000/172,000 186,000 15-45 81.0 3750
155300 300,000/225,000 243,000 30-60 81.0 3830
180275 275,000/206,000 223,000 15-45 81.0 4580
180360 360,000/270,000 292,000 20-50 81.0 5400
UNIT SIZE
581A
TEMPERATURE LIMIT (F)
Standard
Unit Unit With
Low Ambient Kit
Unit With
Motormaster®
Control
155, 180 40 20 –20
UNIT 581A MINIMUM CFM MAXIMUM CFM
155 3900 6500
180 4500 7500