Thermo Products OH8FA119D60R, OH8FA119DV5R, OH6FA072D48N, OH6FA072DV4N, OH6FX072DV4R, OH8FA119DV5B

For PSC systems, the ½ hp motor is equipped with 4 speeds. The unit is set for mid-fire temp rise @ 65ºF. See table for proper blower motor set up:

OH6FA072D48

ALTERATIONS REQ’D FOR A/C @ DESIGN EXTERNAL STATIC PRESSURE

	COOLING UNIT	HTG Speed by Input			Recommended CLG Speed
		Low	Mid	High
		Fire	Fire	Fire
24,000		Low	ML	MH	Low
30,000		Low	ML	MH	Med Low
36,000		Low	ML	MH	Med High
42,000		Low	ML	MH	Med High
48,000		Low	ML	MH	High

Speed Tap\ Static			Furnace Airflow (CFM) vs. External Static pressure (in. WC.)
Pressure	0.1		0.2	0.3	0.4		0.5	0.6	0.7
Low	930		915	912	910		822	774	730
ML	1155		1152	1130	1126		1085	1042	920
MH	1442		1432	1418	1382		1334	1293	1230
High	1802		1762	1705	1635		1569	1493	1428
	Furnace Motor Current Draw (Amps) vs. External Static pressure (in. WC.)
Low	3.3		3.1	3.0	2.9		2.6	2.5	2.4
ML	4.2		4.0	3.9	3.7		3.6	3.3	3.0
MH	5.4		5.2	5.0	4.7		4.4	4.2	4.0
High	6.6		6.4	6.0	5.7		5.5	5.2	5.0
Speed Tap\ Static		High Fire Temperature Rise vs. External Static pressure (in. WC.)
Pressure	0.1		0.2	0.3	0.4		0.5	0.6	0.7
Low	90		91	91	92		101	108	114
ML	72		72	74		74	77	80	91
MH	58		58	59		60	62	64	68
High	46		47	49	51		53	56	58
Speed Tap\ Static		Mid Fire Temperature Rise vs. External Static pressure (in. WC.)
Pressure	0.1		0.2	0.3	0.4		0.5	0.6	0.7
Low	72		73	73		73	81	86	91
ML	58		58	59		59	61	64	72
MH	46		47	47	48		50	52	54
High	37		38	39	41		42	45	47
Speed Tap\ Static		Low Fire Temperature Rise vs. External Static pressure (in. WC.)
Pressure	0.1		0.2	0.3	0.4		0.5	0.6	0.7
Low	60		61	61		61	68	72	76
ML	48		48	49	49		51	53	60
MH	39		39	39	40		42	43	45
High	31		32	33	34		35	37	39

Figure 19A: Heating speed by input

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