10
Table 1 — Physical Data 581B (cont)
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 —
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 .104...39
060N .082...45 .082...45 .082...45 —
090N .082...45 .082...45 .082...45 —
120N — .094...42 .094...42 —
Thermostat Heat Anticipator Setting (amps)
208/230/460 v
FirstStage .14 .14 .14 .14
Second Stage .14 .14 .14 .14
GasInput(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 — 80 80 80
071 82 82 82 —
114 80 81 81 —
149 — 80 80 —
060N 80 80 80 —
090N 80 80 80 —
120N — 80 80 —
TemperatureRiseRange 072 15---45 15---45 15---45 15 ---45
115 55---85 35---65 35---65 35 ---65
150 — 50---80 50---80 50---80
071 15---45 15---45 15---45 —
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 —
ManifoldPressure(in.wg)
Natural Gas —Std 3.5 3.5 3.5 3.5
Propane —Alt†† 3.5 3.5 3.5 3.5
Maximum Static Pressure (in. wg) 1.0 1.0 1.0 1.0
Field Gas Connection Size (in.) 1/2 1/2 1/2 1/2
HIGH-PRESSURESWITCH (psig)
Standard Compressor Internal Relief
450 50
Cutout
428
Reset (Auto.)
320
LOSS-OF-CHARGESWITCH/LOW-PRESSURE
(Liquid Line) (psig)
Cutout
7 3
Reset (Auto.)
22 5
FREEZEPROTECTIONTHERMOSTAT
Opens (F)
30 5
Closes (F)
45 5
OUTDOOR-AIR INLETSCREENS
Cleanable. Screen quantity and size varieswith option selected.
RETURN-AIR FILTERS
Throwaway
Quantity...Size(in.)
2...16 x 25 x2 4...16x 16 x 2
LEGEND
Bhp — Brake Horsepower
**60,000 and 72,000Btuh heat input unitshave 2 burners.90,000 and 120,000 Btuh
heat i nput units have 3 burners. 115,000 Btuh heat input units and 150,000 Btuh
Heat input unitshave 3burners.
††A propane kitis available asan accessory.Kitmaybe usedat elevationsas highas
2000 ft. If a propane kit is used with Low NOx units, the Low NOx baffle must be
removed and theunitswill no longerbe classified asLow NOxunits.
ll Three-phase standard models have heating inputs as shown. Single-phase stan-
dard models have one-stage heating with heating inputvalues.
***Californiacompliantthree-phasemodels.
†††California SCAQMD compliantlow NO
x
modelshave combustionproducts that are
controlledto40nanogramsperjouleorless.
581B,C
