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PHYSICAL DATA — 581B036-072 (cont)
LEGEND
*Single phase/three phase.
†Indicates automatic reset.
**60,000 and 72,000 Btuh heat input units have 2 burners. 90,000 and
120,000 Btuh heat input units have 3 burners. 115,000 Btuh heat input units
and 150,000 Btuh Heat input units have 3 burners.
††An LP kit is available as an accessory. In order to convert a Low NOx unit to
LP gas, the baffle must be removed. Low NOx units converted to LP gas are
no longer California SCAQMD compliant.
||California compliant three-phase models.
***California SCAQMD compliant low NO
x
models have combustion products that
are controlled to 40 nanograms per joule or less.
UNIT SIZE 581B 036 048 060 072
FURNACE SECTION
Rollout Switch Cutout Temp (F)† 195 195 195 195
Burner Orifice Diameter (in. ...drill size)**
Natural Gas — Std 071/072 .113...33 .113...33 .113...33 .113...33
114/115 .113...33 .113...33 .113...33 .113...33
149/150 — .129...30 .129...30 .129...30
060N .102...38 .102...38 .102...38 —
090N .102...38 .102...38 .102...38 —
120N — .116...32 .116...32 —
Liquid Propane — Alt††
071/072 .089...43 .089...43 .089...43 .089...43
114115 .089...43 .089...43 .089...43 .089...43
149/150 — .102...38 .102...38 .102...38
Thermostat Heat Anticipator Setting (amps)
208/230/460 v
First Stage .14 .14 .14 .14
Second Stage .14 .14 .14 .14
Gas Input (Btuh)
First Stage/Second Stage (3-phase units) 072 50,000/ 72,000 50,000/ 72,000 50,000/ 72,000 50,000/ 72,000
115 82,000/115,000 82,000/115,000 82,000/115,000 82,000/115,000
150 — 120,000/150,000 120,000/150,000 120,000/150,000
071II —/ 72,000 —/ 72,000 —/ 72,000 —
114II —/115,000 —/115,000 —/115,000 —
149II — —/150,000 —/150,000 —
060N*** —/ 60,000 —/ 60,000 —/ 60,000 —
090N*** —/ 90,000 —/ 90,000 —/ 90,000 —
120N*** — —/120,000 —/120,000 —
Efficiency (Steady State) (%)
072 82 82 82 82
115 80 81 81 81
150 —8080 80
071 82 82 82 —
114 80 81 81 —
149 —8080—
060N 80 80 80 —
090N 80 80 80 —
120N —8080—
Temperature Rise Range
072 25-55 25-55 25-55 25-55
115 55-85 35-65 35-65 35-65
150 — 50-80 50-80 50-80
071 25-55 25-55 25-55 —
114 55-85 35-65 35-65 —
149 — 50-80 50-80 —
060N 20-50 20-50 20-50 —
090N 30-60 30-60 30-60 —
120N — 40-70 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
Gas Valve Quantity
1111
Gas Valve Pressure Range (Min-Max Allowable)
Psig 0.180-0.470 0.180-0.470 0.180-0.470 0.180-0.470
in. wg 5.0-13.0 5.0-13.0 5.0-13.0 5.0-13.0
Maximum Static Pressure (in. wg) 1.0 1.0 1.0 1.0
Field Gas Connection Size (in. FPT)
1
/
2
1
/
2
1
/
2
1
/
2
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 ± 5
FREEZE PROTECTION THERMOSTAT
Opens (F) 30 ± 5
Closes (F) 45 ± 5
OUTDOOR-AIR INLET SCREENS Cleanable
Quantity...Size (in.) Varies By Option Selected
RETURN-AIR FILTERS Throwaway
Quantity...Size (in.) 2...16 x 25 x 2 4...16 x 16 x 2
Bhp—
Brake Horsepower
581B036-150