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PHYSICAL DATA — 581B090-150 (cont)
LEGEND
*Single phase/three phase.
†Indicates automatic reset.
**180,000 Btuh heat input units have 2 burners.
224,000 Btuh heat input units and 250,000 Btuh Heat input units have
3 burners.
††An LP kit is available as an accessory.
UNIT SIZE 581B 090 102 120 150
FURNACE SECTION
Rollout Switch Cutout Temp (F)† 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 — Alt††
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)
Stage 1 .14 .14 .14 .14
.14 .14 .14 .14
.14 .14 .14
Stage 2 .14 .14 .20 .20
.20 .20 .20 .20
.20 .20 .20
Gas Input (Btuh) Stage 1
Lo
90,000 90,000 120,000 120,000
Med
120,000 120,000 180,000 180,000
Hi
180,000 180,000 200,000
Stage 2
Lo
125,000 125,000 180,000 180,000
Med
180,000 180,000 224,000 224,000
Hi
224,000 224,000 250,000
Efficiency (Steady State) (%) 82 82 82 82
82 82 82 80
82 82 80
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 — Alt†† 3.5 3.5 3.5 3.5
Field Gas Connection Size (in.)
Lo
.50 .50 .75 .75
Med
.75 .75 .75 .75
Hi
.75 .75 .75
HIGH-PRESSURE SWITCH (psig)
Standard Compressor Internal Relief 450 ± 50
Cutout 428
Reset (Auto.) 320
LOSS-OF-CHARGE SWITCH/LOW-PRESSURE
SWITCH (Liquid LIne) (psig)
Cutout 7 ± 3
Reset (Auto.) 22 ± 7
FREEZE PROTECTION THERMOSTAT
Opens (F) 30 ± 5
Closes (F) 45 ± 5
OUTDOOR-AIR INLET SCREENS Cleanable
Quantity...Size (in.)
1...20 x 25 x 1
1...16 x 25 x 1
RETURN-AIR FILTERS Throwaway
Quantity...Size (in.) 4...16 x 20 x 2 4...20 x 20 x 2 4...20 x 20 x 2 4...20 x 20 x 2
Bhp — Brake Horsepower
581B036-150