12
PHYSICAL DATA (cont)
LEGEND
*Weight of 14-in. roof curb.
†Rollout switch lockout is manually reset by interrupting power to unit or
resetting thermostat.
NOTE:
High-static motor not available on size 150 units.
UNIT SIZE 581B
HEAT
090 102 120 150
FURNACE SECTION
Rollout Switch Cutout Temp†
195 195 195 195
Burner Orifice Diameter
(in. ...drill size)
Natural Gas Std Lo
.120...31 .120...31 .120...31 .120...31
Med
.120...31 .120...31 .120...31 .129...30
Hi
.120...31 .120...31 .129...30 —
Liquid Propane Accy Lo
.096...41 .096...41 .096...41 .096...41
Med
.096...41 .096...41 .096...41 .102...38
Hi
.096...41 .096...41 .102...38 —
Thermostat Heat Anticipator
Setting (amps)
208/230 v and 575 Stage 1
.14 .14 .14 .14
Stage 2
.20 .20 .20 .20
460 v Stage 1
.14 .14 .14 .14
Stage 2
.20 .20 .20 .20
Gas Input (Btuh)Stage1/Stage 2 Lo
125,000/— 125,000/— 120,000/180,000 180,000/224,000
Med
120,000/180,000 120,000/180,000 180,000/224,000 200,000/250,000
Hi
180,000/224,000 180,000/224,000 200,000/250,000 —/—
Efficiency (Steady State) (%)
82 82
82, 80 (in 250,000 Btuh
heat range)
82, 80 (in 250,000 Btuh
heat range)
Temperature Rise Range Lo
20-50 20-50 35-65 35-65
Med
35-65 35-65 35-65 40-70
Hi
45-75 45-75 40-70 —
Manifold Pressure (in. wg)
Natural Gas Std
3.5 3.5 3.5 3.5
Liquid Propane Accy
3.5 3.5 3.5 3.5
Gas Valve Quantity
11 1 1
Gas Valve Pressure Range
Psig
0.180-0.487 0.180-0.487 0.180-0.487 0.180-0.487
in. wg
5.0-13.5 5.0-13.5 5.0-13.5 5.0-13.5
Field Gas Connection
Size (in.) Lo
1
/
2
1
/
2
3
/
4
3
/
4
Med
3
/
4
3
/
4
3
/
4
3
/
4
Hi
3
/
4
3
/
4
3
/
4
—
HIGH-PRESSURE SWITCH (psig)
Standard Compressor
450 ± 50 500 ± 50
Internal Relief (Differential)
Cutout
428 428
Reset (Auto.)
320 320
LOSS-OF-CHARGE (LOW-PRESSURE)
SWITCH (psig)
Cutout
7 ± 3
Reset (Auto.)
22 ± 7
FREEZE PROTECTION
THERMOSTAT (F)
Opens
30 ± 5
Closes
45 ± 5
OUTDOOR-AIR INLET SCREENS
Cleanable
Quantity...Size (in.)
1...20 x 24 x 1
1...16 x 25 x 1
RETURN-AIR FILTERS
Throwaway
Quantity...Size (in.)
4...16 x 20 x 2 4...16 x 20 x 2 4...20 x 20 x 2 4...20 x 20 x 2
Bhp —
Brake Horsepower
