12
Table 2 — Physical Data 581C (cont)
UNIT SIZE 581C
024
036
048
060
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
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
—
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
—
Temperature Rise Range
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
—
Manifold Pressure (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-PRESSURE SWITCH (psig)
Standard Compressor Internal Relief
450
±
50
Cutout
428
Reset (Auto.)
320
LOSS-OF-CHARGE SWITCH/LOW-PRESSUR
E
(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. Screen quantity and size varies with option selected.
RETURN-AIR FILTERS
Throwaway
Quantity...Size (in.)
2...16 x 25 x 2
4...16 x 16 x 2
LEGEND
Bhp —
Brake Horsepower
**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.
††A propane kit is available as an accessory. Kit may be used at elevations as high as
2000 ft. If a propane kit is used with Low NOx units, the Low NOx baffle must be
removed and the units will no longer be classified as Low NOx units.
ll Three-phase standard models have heating inputs as shown. Single-phase stan-
dard models have one-stage heating with heating input values.
***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.
581B
,C