Bryant 581B Furnace Section, Loss-Of-Charge Switch/Low-Pressure, Freeze Protection Thermostat

Table 1 — Physical Data — 581B036-072 (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	—
Liquid Propane — Alt††	071/072	.089...43	.089...43	.089...43	.089...43
	114/115	.089...43	.089...43	.089...43	.089...43
	149/150	—	.102...38	.102...38	.102...38
	060N	.082...45	.082...45	.082...45	—
	090N	.082...45	.082...45	.082...45	—
Thermostat Heat Anticipator Setting (amps)	120N	—	.094...42	.094...42	—
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	82.8	82.8	82.8	82
	115	80	81	81	81
	150	—	80.4	80.4	80
	071	82	82	82	—
	114	80	81	81	—
	149	—	80	80	—
	060N	80.2	80.2	80.2	—
	090N	81	81	81	—
	120N	—	80.7	80.7	—
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	—
Manifold Pressure (in. wg)	120N	—	40-70	40-70	—
Natural Gas — Std		3.5	3.5	3.5	3.5
Liquid 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)			450 ± 50
Standard Compressor Internal Relief
Cutout			428
Reset (Auto.)			320
LOSS-OF-CHARGE SWITCH/LOW-PRESSURE
SWITCH (Liquid LIne) (psig)			7 ± 3
Cutout
Reset (Auto.)			22 ± 5
FREEZE PROTECTION THERMOSTAT			30 ± 5
Opens (F)
Closes (F)			45 ± 5
OUTDOOR-AIR INLET SCREENS			Cleanable
Quantity...Size (in.)			1...20 x 24 x 1
RETURN-AIR FILTERS			Throwaway		4...16 x 16 x 2
Quantity...Size (in.)			2...16 x 25 x 2

LEGEND

Bhp — Brake Horsepower

*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. If an LP kit is used with low NOx units, one low NOx baffle must be removed and the units will no longer be classified as low NOx units.

California compliant three-phase models.

***California SCAQMD compliant low NOx models have combustion products that are controlled to 40 nanograms per joule or less.

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