Carrier 48PG20-28 specifications Physical Data

Table 1 — Physical Data

UNIT 48PG		20			24			28
VOLTAGE		208/230 and 460	575	208/230 and 460		575	208/230 and 460		575
NOMINAL CAPACITY (Tons)		18	18	20		20	25		25
OPERATING WEIGHT (lb)
48 Series (Low Heat) Al/Al*		2480	2480	2588		2588	2773		2773
COMPRESSOR				Fully Hermetic Scroll
Quantity		2	2	2		2	3		3
Number of Refrigerant Circuits		2	2	2		2	2		2
Oil (ounces) Comp A1, A2, B1		85, NA, 85	85, NA, 85	85, NA, 85		85, NA, 85	85, 85, 85		85, 85, 85
REFRIGERANT TYPE				Puron® Refrigerant (R-410A)
Expansion Device		TXV	TXV	TXV		TXV	TXV		TXV
Change Type
Operating Charge (lb)
Circuit A		25.3	25.3	35.7		35.7	49.3		49.3
Circuit B		25.3	25.3	33.5		33.5	24.3		24.3
REFRIGERANT SUBCOOLER
Heat Exchanger Size		B15Hx26x26	B15Hx26x26	B15Hx26x26		B15Hx26x26	B15Hx26x36		B15Hx26x36
Expansion Device		TXV	TXV	TXV		TXV	TXV		TXV
CONDENSER COIL			Enhanced Copper Tubes, Aluminum Lanced Fins
Rows...Fins/inch		2...17	2...17	3...17		3...17	3...17		3...17
Quantity		2	2	3		3	3		3
Length of Tube Sheets (in.)		80.3	80.3	80.3		80.3	80.3		80.3
Width (in.)		60	60	60		60	60		60
Total Face area (sq. ft)		33.46	33.46	33.46		33.46	33.46		33.46
CONDENSER FAN				Propeller
Nominal Cfm (Total, all fans)		14,000	14,000	21,000		21,000	21,000		21,000
Quantity...Diameter (in.)		4...22	4...22	6...22		6...22	6...22		6...22
Motor Hp...Rpm		1/4...1100	1/4...1100	1/4...1100		1/4...1100	1/4...1100		1/4...1100
Watts input (Total)		1400	1400	2100		2100	2100		2100
EVAPORATOR COIL			Enhanced Copper Tubes, Face Split, Aluminum Double-Wavy Fins
Rows...Fins/inch		4...15	4...15	4...15		4...15	4...15		4...15
Length of Tube Sheets (in.)		69.4	69.4	69.4		69.4	69.4		69.4
Width (in.)		48	48	48		48	60		60
Total Face area (sq ft)		23.13	23.13	23.13		23.13	28.92		28.92
EVAPORATOR FAN				Centrifugal, Belt Type
Quantity...Size (in.)		2...15 x 11	2...15 x 11	2...15 x 11		2...15 x 11	2...15 x 11		2...15 x 11
Type Drive		Belt	Belt	Belt		Belt	Belt		Belt
Nominal Cfm		7000	7000	8000		8000	10,000		10,000
Motor Bearing Type		Ball	Ball	Ball		Ball	Ball		Ball
Maximum Allowable Fan Rpm		1400	1400	1400		1400	1400		1400
FURNACE SECTION
Rollout Switch Cutout Temp (F)	Vertical	225	225	225		225	225		225
Burner Orifice Diameter (in. ...drill size)		0.136...29	0.136...29	0.136...29		0.136...29	0.136...29		0.136...29
Gas		Natural	Natural	Natural		Natural	Natural		Natural
Thermostat Heat Anticipator Setting
Stage 1 (amps)		0.98	0.98	0.98		0.98	0.98		0.98
Stage 2 (amps)		0.44	0.44	0.44		0.44	0.44		0.44
Gas Input (Btuh) HIGH HEAT	Stage 1	317,000	317,000	317,000		317,000	317,000		317,000
	Stage 2	400,000	400,000	400,000		400,000	400,000		400,000
Efficiency (Steady State) %	Vertical	82	82	82		82	82		82
Temperature Rise Range		25-55	25-55	25-55		25-55	25-55		25-55
Gas Input (Btuh) MEDIUM HEAT	Stage 1	281,000	281,000	281,000		281,000	281,000		281,000
	Stage 2	365,000	365,000	365,000		365,000	365,000		365,000
Efficiency (Steady State) %	Vertical	81	81	81		81	81		81
Temperature Rise Range		25-55	25-55	25-55		25-55	25-55		25-55
Gas Input (Btuh) LOW HEAT	Stage 1	199,000	199,000	199,000		199,000	199,000		199,000
	Stage 2	250,000	250,000	250,000		250,000	250,000		250,000
Efficiency (Steady State) %	Vertical	82	82	82		82	82		82
Temperature Rise Range		15-45	15-45	15-45		15-45	15-45		15-45
Manifold Pressure
Natural Gas (in. wg)	Vertical	3.00	3.00	3.00		3.00	3.00		3.00
Natural Gas (in. wg)	Horizontal	2.95	2.95	2.95		2.95	2.95		2.95
Gas Valve Quantity		1	1	1		1	1		1
Gas Valve Pressure Range	(in. wg)	5.5-13.0	5.5-13.0	5.5-13.0		5.5-13.0	5.5-13.0		5.5-13.0
Min-Max Allowable	(psig)	.235-.469	.235-.469	.235-.469		.235-.469	.235-.469		.235-.469
Field Gas Connection Size (in...FPT)		3/4	3/4	3/4		3/4	3/4		3/4
HIGH-PRESSURE SWITCHES (psig)
Cutout		630 ± 10	630 ± 10	630 ± 10		630 ± 10	630 ± 10		630 ± 10
Reset (Auto)		505 ± 20	505 ± 20	505 ± 20		505 ± 20	505 ± 20		505 ± 20
OUTDOOR AIR INLET SCREENS
Quantity...Size (in.)		3...20 x 25	3...20 x 25	3...20 x 25		3...20 x 25	3...20 x 25		3...20 x 25
RETURN-AIR FILTERS
Quantity...Size (in.)		9...16 x 25 x 2	9...16 x 25 x 2	9...16 x 25 x 2		9...16 x 25 x 2	9...20 x 25 x 2		9...20 x 25 x 2

LEGEND

TXV — Thermostatic Expansion Valve

*Aluminum evaporator coil/aluminum condenser coil.

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