Table 1 — physical data – Bryant SINGLE PACKAGE ROOFTOP ELECTRIC COOLING/GAS HEATING UNITS 581A User Manual
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Table 1 — Physical Data
LEGEND
*Evaporator coil fin material/condenser coil fin material.
†Weight of 14-in. roof curb.
**Circuit 1 uses the lower portion of condenser coil and lower portion of evaporator coils, and
Circuit 2 uses the upper portion of both coils.
††Pulley has 6 turns. Due to belt and pulley, moveable pulley cannot be set to 0 to 1 turns open.
llRollout switch is manual reset.
UNIT 581A
155
180
240
NOMINAL CAPACITY (tons)
12
15
20
OPERATING WEIGHT (lb)
Unit
Al/Al*
1725
1800
1900
Al/Cu*
1875
1950
2050
Cu/Cu*
2005
2080
2180
Economizer
110
110 110
Roof Curb†
200
200
200
COMPRESSOR
Quantity
2
2
2
Number of Refrigerant Circuits
2
2
2
Crankcase Heater Watts
70
70
70
Oil (oz) (Ckt 1, Ckt 2)
60,66
85,60
110,110
REFRIGERANT TYPE
R-22
Expansion Device
TXV
Operating Charge (lb oz)
Circuit 1**
20.7
19.5
18.5
Circuit 2
11.9
13.45
13.3
CONDENSER COIL
Cross-Hatched
3
/
8
-in. Copper Tubes, Aluminum Lanced, Aluminum Pre-Coated, or Copper Plate Fins
Rows...Fins/in.
4...15
4...15
4...15
Total Face Area (sq ft)
21.7
21.7
21.7
CONDENSER FAN
Propeller Type
Nominal Cfm
10,500
10,500
14,200
Quantity...Diameter (in.)
3...22
3...22
2...30
Motor Hp...Rpm
1
/
2
...1050
1
/
2
...1050
1...1075
Watts Input (Total)
1100
1100
3400
EVAPORATOR COIL
Cross-Hatched
3
/
8
-in. Copper Tubes, Aluminum Lanced or Copper Plate Fins, Face Split
Rows...Fins/in.
4...15
4...15
4...15
Total Face Area (sq ft)
17.5
17.5
17.5
EVAPORATOR FAN
Centrifugal Type
Quantity...Size (in.)
2...10 X 10
2...12 x 12
2...12 x 12
Type Drive
Belt
Belt
Belt
Nominal Cfm
5200
6000
8000
Std Motor Hp
2.9
5
7.5
Opt Motor Hp
3.7
Motor Nominal Rpm
1725
1745
1745
Std Maximum Continuous Bhp
3.13
6.13
9.47 (208 v)
10.33
(230 and 460 v)
Opt Maximum Continuous Bhp
4.38
Motor Frame Size
56H
184T
213T
Fan Rpm Range
Low-Medium Static
834-1064
873-1021
1002-1151
High Static
1161-1426
1025-1200
1193-1369
Motor Bearing Type
Ball
Ball
Ball
Maximum Allowable Rpm
1550
1550
1550
Motor Pulley Pitch Dia.
Low-Medium Static
3.1/4.1
4.9/5.9
5.4/6.6
High Static
3.7/4.7
4.9/5.9
5.4/6.6
Nominal Motor Shaft Diameter (in.)
7
/
8
1
1
/
8
1
3
/
8
Fan Pulley Pitch Diameter (in.)
Low-Medium Static
6.0
9.4
9.4
High Static
5.2
8.0
7.9
Nominal Fan Shaft Diameter (in.)
1
3
/
16
1
7
/
16
1
7
/
16
Belt, Quantity...Type... Length (in.)
Low-Medium Static
1...BX...42
1...BX...50
1...BX...54
High Static
1...BX...42
1...BX...48
1...BX...50
Pulley Center Line Distance (in.)
13.5-15.5
13.3-14.8
14.6-15.4
Speed Change per Full Turn of
Movable Pulley Flange (Rpm)
Low-Medium Static
58
37
37
High Static
67
44
44
Movable Pulley Maximum
Full Turns From Closed Position
4††
4††
4††
Factory Speed
3.5
3.5
3.5
Factory Speed Setting (Rpm)
Low-Medium Static
978
965
1095
High Static
1327
1134
1303
FURNACE SECTION
Rollout Switch Cutout Temp (F) ll
190
190
190
Burner Orifice Diameter (in...drill size)
Natural Gas
0.1285...30/ 0.136...29
0.1285...30/ 0.136...29
0.1285...30/ 0.136...29
Thermostat Heat Anticipator Setting
Stage 1 (amps)
0.98
0.8
0.98
0.8
0.98
0.8
Stage 2 (amps)
0.44
0.44
0.44
0.44
0.44
0.44
Gas Input (Btuh) Stage 1
172,000/230,000
206,000/275,000
206,000/275,000
Stage 2
225,000/300,000
270,000/360,000
270,000/360,000
Efficiency (Steady State) (%)
81
81
81
Temperature Rise Range
15-45/30-60
15-45/20-50
15-45/20-50
Manifold Pressure (in. wg)
Natural Gas
3.3
3.3
3.3
Gas Valve Quantity
1
1
1
Gas Valve Pressure Range (in. wg)
5.5-13.5
5.5-13.5
5.5-13.5
(psig)
.235-.487
.235-.487
.235-.487
Field Gas Connection Size (in.-FPT)
3
/
4
3
/
4
3
/
4
HIGH-PRESSURE SWITCH (psig)
Cutout
426
Reset (Auto.)
320
LOW-PRESSURE SWITCH (psig)
Cutout
27
Reset (Auto.)
44
FREEZE PROTECTION THERMOSTAT (F)
Opens
30 ± 5
Closes
45 ± 5
OUTDOOR-AIR INLET SCREENS
Cleanable
Quantity...Size (in.)
2...20 x 25 x 1
1...20 x 20 x 1
RETURN-AIR FILTERS
Throwaway
Quantity...Size (in.)
4...20 x 20 x 2
4...16 x 20 x 2
Al
—
Aluminum
Bhp
—
Brake Horsepower
Cu
—
Copper
TXV
—
Thermostatic Expansion Valve