Thermo Products OH6FA072D48N, OH8FA119DV5R, OH8FA119D60R, OH6FA072D48B, OH6FA072DV4N, OH6FA072DV4R

For PSC systems, the ½ hp motor is equipped with 4 speeds. The unit is set for mid-fire temp rise @ 66ºF. 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							86	91
	72		73	73	73	81
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

33