Bryant 581B PHYSICAL DATA cont, Furnace Section, HIGH-PRESSURESWITCH psig, Freeze Protection

PHYSICAL DATA (cont)

UNIT SIZE 581B		HEAT	090	102		120	150
FURNACE SECTION
Rollout Switch Cutout Temp†			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	Accy	Lo	.096...41	.096...41		.096...41	.096...41
		Med	.096...41	.096...41		.096...41	.102...38
Thermostat Heat Anticipator		Hi	.096...41	.096...41		.102...38	—
Setting (amps)
208/230 v and 575 Stage 1			.14	.14		.14	.14
	Stage 2		.20	.20		.20	.20
460 v	Stage 1		.14	.14		.14	.14
	Stage 2		.20	.20		.20	.20
Gas Input (Btuh)Stage1/Stage 2		Lo	125,000/—	125,000/—		120,000/180,000	180,000/224,000
		Med	120,000/180,000	120,000/180,000		180,000/224,000	200,000/250,000
Efficiency (Steady State) (%)		Hi	180,000/224,000	180,000/224,000		200,000/250,000	—/—
			82	82		82, 80 (in 250,000 Btuh	82, 80 (in 250,000 Btuh
						heat range)	heat range)
Temperature Rise Range		Lo
			20-50	20-50		35-65	35-65
		Med	35-65	35-65		35-65	40-70
Manifold Pressure (in. wg)		Hi	45-75	45-75		40-70	—
Natural Gas	Std		3.5	3.5		3.5	3.5
Liquid Propane	Accy		3.5	3.5		3.5	3.5
Gas Valve Quantity			1	1		1	1
Gas Valve Pressure Range
Psig			0.180-0.487	0.180-0.487		0.180-0.487	0.180-0.487
in. wg			5.0-13.5	5.0-13.5		5.0-13.5	5.0-13.5
Field Gas Connection
Size (in.)		Lo	1/2	1/2		3/4	3/4
		Med	3/4	3/4		3/4	3/4
		Hi	3/4	3/4		3/4	—
HIGH-PRESSURE SWITCH (psig)
Standard Compressor				450 ± 50			500 ± 50
Internal Relief (Differential)
Cutout				428			428
Reset (Auto.)				320			320
LOSS-OF-CHARGE (LOW-PRESSURE)
SWITCH (psig)
Cutout					7 ± 3
Reset (Auto.)					22 ± 7
FREEZE PROTECTION
THERMOSTAT (F)
Opens					30 ± 5
Closes					45 ± 5
OUTDOOR-AIR INLET SCREENS						Cleanable
Quantity...Size (in.)					1...20 x 24 x 1
					1...16 x 25 x 1
RETURN-AIR FILTERS						Throwaway
Quantity...Size (in.)			4...16 x 20 x 2	4...16 x 20 x 2		4...20 x 20 x 2	4...20 x 20 x 2

LEGEND

Bhp — Brake Horsepower

*Weight of 14-in. roof curb.

†Rollout switch lockout is manually reset by interrupting power to unit or resetting thermostat.

NOTE: High-static motor not available on size 150 units.

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