NuTone FG7S (A and K Series) High Efficiency Upflow/Horizontal and Downflow Gas Furnaces

Technical Specifications

• Model: FG7S (A and K Series)
• Type: High Efficiency Upflow/Horizontal and Downflow Gas
  Furnaces
• Induced Draft
• 80+ AFUE
• Input: 45,000 – 126,000 Btuh

Features and Benefits

• GAS FURNACE COMPONENTS:
  • Blower Assembly
  • Blower Door Switch
  • Burner Assembly
  • Control Board
  • Flame Sensor
  • Gas Manifold
  • Gas Valve
  • Igniter
  • Inducer
  • Insulated Combustion Tube (Downflow Models)
  • Low Voltage Transformer
  • Main Air Limit Switch
  • Pressure Switch
  • Roll-Out Switch(s)

Dimensions

A Series

Model #’s	A Dimension	B Dimension	C Dimension	D Dimension
045-23A	12	12	21	14
054-23A	12	12	15	16
072-24B	15	16	21	14
090-24B	15	16	19	19
072-35C	21	14	19	19
090-35C	21	14	22	23
108-35C	21	19	22	23
126-45D	23	19	22	23

K Series

Model #’s	A Dimension	B Dimension	C Dimension	D Dimension
054-23A	12	12	21	14
072-24B	15	16	21	14
090-24B	15	16	19	19
108-35C	21	14	19	19
126-45D	22	23	19	19

Blower Performance – FG7SA Model Number

Heating Input (Btuh)	Motor Speed	External Static Pressure (Inches Water Column)	0.1	0.2	0.3	0.4	0.5	0.6	0.7	0.8
45,000	High*	1260	1205	1145	1080	1025	960	890	825
	Med-High	955	825
	Med-Low**	950	800

Product Usage Instructions

FAQ

Q: Where can the high-efficiency gas furnace be installed?
A: The high efficiency gas furnace may be installed free standing in a utility room, basement, or enclosed in an alcove or closet.

Q: Is the gas furnace design certified?
A: Yes, the gas furnace design is certified by CSA for application in Canada and the United States.

TECHNICAL SPECIFICATIONS

FG7S (A and K Series)
High-Efficiency Upflow/Horizontal and
Downflow Gas Furnaces
Induced Draft – 80+ AFUE
Input 45,000 – 126,000 Btuh
The high-efficiency gas furnace may be installed free standing in a utility room, basement, or enclosed in an alcove or closet. The rounded corner jacket provides a pleasing “appliance appearance.” Design certified by CSA for application in Canada and the United States.

FEATURES and BENEFITS

• 100% fired and tested: All units and each component are tested on the manufacturing line.
• Best packaging in the industry: Unique corner post design assures product will arrive to the homeowner dent-free.
  • Low Boy Height: Easy to apply in low ceiling applications, works well with taller high SEER coils, easier to handle and install.
  • Tubular primary heat exchanger: Heavy gauge aluminized steel heat exchanger assures a long life.
  • 30 second blower delay at start-up: Assures a warm duct temperature at furnace start-up. Adjustable blower off settings (60, 90, 120 and 180 seconds).
  • 30 second post purge: Increases life of heat exchanger.
  • Hot surface igniter: Innovative application of a silicon nitride igniter. Utilizes proven Smartlite® technology.
  • Color coded wire harness: Designed to fit the components, all with quick-connect fittings for ease of service and replacement.
  • High static blowers: All models equipped with high static blowers.
  • 90 second cooling cycle blower-off delay (TDR): increases cooling performance when matched with a Nortek Global HVAC coil.
  • Flexible category I venting system: May be vented with dedicated venting system or common vented with other category one appliances.
  • High efficiency blower kits: Maximize efficiencies. On select units, a SEER improvement of up to 1 point is realized.
  • Multi-speed direct drive blower: Designed to give a wide range of cooling capacities. Switches on PCB, provide ultra easy motor speed selection.
  • LP convertible: Simple burner orifice and regulator spring change for ease of convertibility.
  • Diagnostic lights for easy troubleshooting without counting flashes: Dedicated light for flame signal strength and 2 lights in combination to indicate all other fault codes with easy to recognize states without counting flashes.
  • Integrated control board: Incorporates connections for electronic air cleaner and humidifier.
  • Two piece door design: Enhances furnace appearance and uses captured screws to prevent loosing door screws.
  • Blower Compartment: Insulated for ultra quiet operation.
  • Furnace Air Leakage: These furnaces comply with Energy Star cabinet air leakage requirement of less than or equal to 2%. Keep the conditioned air flowing to where it’s needed.

GAS FURNACE COMPONENTS

1. Blower Assembly
2.  Blower Door Switch
3.  Burner Assembly
4. Control Board
5. Flame Sensor
6. Gas Manifold
7. Gas Valve
8. Igniter
9. Inducer
10.  Insulated Combustion Tube wnflow Models)
11. Low Voltage Transformer
12. Main Air Limit Switch
13. Pressure Switch
14. Roll-Out Switch(s)

DIMENSIONS

FG7SA 80+ High Efficiency Upflow/Horizontal Series

FG7SK 80+ High Efficiency Downflow Series

BLOWER PERFORMANCE – FG7SA

Model Number	Heating Input (Btuh)	Motor Speed	External Static Pressure (Inches Water Column)
			0.1		0.2		0.3		0.4		0.5		0.6		0.7		0.8
			CFM	Rise	CFM	Rise	CFM	Rise	CFM	Rise	CFM	Rise	CFM	Rise	CFM	Rise	CFM	Rise
		High*	1260	26	1205	28	1145	29	1080	31	1025	33	960	35	890	37	825	40
SA045( )-23A Bottom Return	45,000	Med-High Med-Low**	955 825	35 40	950 800	35 42	940 760	35 44	935 730	36 46	925 690	36 48	860 650	39 51	800 600	42	725 530	46
																–		–
		Low	655	51	630	53	610	55	580	–	550	–	520	–	480	–	435	–
		High*	1350	25	1290	26	1225	27	1155	29	1100	30	1025	33	950	35	885	38
SA045( )-23A Side Return	45,000	Med-High Med-Low**	1025 885	33 38	1015 855	33 39	1005 815	33 41	1000 780	33 43	990 740	34 45	920 695	36 48	855 640	39 52	775 565	43
																		–
		Low	700	48	675	49	655	51	620	–	590	–	555	–	515	–	465	–
		High*	1260	32	1205	33	1145	35	1080	37	1025	39	960	42	890	45	825	48
SA054( )-23A Bottom Return	54,000	Med-High Med-Low**	955 825	42 48	950 800	42 50	940 760	43 53	935 730	43 55	925 690	43	860 650	47	800 600	50	725 530	55
												–		–		–		–
		Low	655	–	630	–	610	–	580	–	550	–	520	–	480	–	435	–
		High*	1350	30	1290	31	1225	33	1155	35	1100	36	1025	39	950	42	885	45
SA054( )-23A Side Return	54,000	Med-High Med-Low**	1025 885	39 45	1015 855	39 47	1005 815	40 49	1000 780	40 51	990 740	40 54	920 695	43	855 640	47	775 565	52
														–		–		–
		Low	700	–	675	–	655	–	620	–	590	–	555	–	515	–	465	–
		High*	1685	32	1640	33	1605	33	1565	34	1515	35	1475	36	1415	38	1345	40
SA072( )-24B Bottom Return	72,000	Med-High Med-Low**	1330 1175	40 45	1295 1155	41 46	1275 1125	42 47	1245 1100	43 48	1215 1075	44 50	1185 1045	45 51	1135 1010	47 53	1070 955	50 56
		Low	930	57	895	60	885	60	850	–	825	–	800	–	770	–	740	–
		High*	1770	30	1720	31	1685	32	1645	32	1590	34	1550	34	1485	36	1415	38
SA072( )-24B Side Return	72,000	Med-High Med-Low**	1400 1235	38 43	1360 1215	39 44	1340 1180	40 45	1310 1155	41 46	1275 1130	42 47	1245 1100	43 48	1190 1060	45 50	1125 1005	47 53
		Low	975	55	940	57	930	57	890	60	865	–	840	–	810	–	775	–
		High*	1610	41	1575	42	1530	44	1485	45	1440	46	1385	48	1340	50	1275	52
SA090( )-24B Bottom Return	90,000	Med- High** Med-Low	1295 1155	51 58	1260 1130	53 59	1235 1100	54 61	1220 1070	55	1175 1035	57	1135 1015	59	1095 965	– –	1015 920	– –
										–		–		–
		Low	880	–	860	–	830	–	800	–	765	–	740	–	675	–	660	–
		High*	1690	39	1655	40	1610	41	1560	43	1510	44	1455	46	1405	47	1340	50
SA090( )-24B Side Return	90,000	Med- High** Med-Low	1360 1215	49 55	1325 1190	50 56	1300 1155	51 58	1280 1125	52 59	1235 1090	54	1190 1065	56	1150 1015	58	1065 965	– –
												–		–		–
		Low	925	–	900	–	870	–	840	–	800	–	775	–	710	–	695	–
		High*	1950	–	1865	–	1790	–	1715	–	1630	–	1550	–	1475	36	1390	38
SA072( )-35C Bottom Return	72,000	Med-High Med-Low**	1860 1300	–	1780 1240	–	1710 1200	–	1635 1160	–	1575 1120	–	1500 1065	36 50	1415 995	38 54	1325 910	40 59
				41		43		44		46		48
		Low	1165	46	1115	48	1060	50	1025	52	985	54	940	57	890	60	825	65
		High*	2030	–	1940	–	1860	–	1785	–	1695	–	1615	–	1535	35	1445	37
SA072( )-35C Side Return	72,000	Med-High Med-Low**	1935 1350	–	1850 1290	–	1780 1250	–	1700 1205	–	1340 1165	40 46	1560 1110	–	1470 1035	36 52	1380 945	39 56
				40		41		43		44				48
		Low	1215	44	1160	46	1105	48	1065	50	1025	52	980	54	925	58	860	62

Model Number	Heating Input (Btuh)	Motor Speed	External Static Pressure (Inches Water Column)
			0.1		0.2		0.3		0.4		0.5		0.6		0.7		0.8
			CFM	Rise	CFM	Rise	CFM	Rise	CFM	Rise	CFM	Rise	CFM	Rise	CFM	Rise	CFM	Rise
SA072( )-35C Side + Bottom or 2 Sides	72,000	High* Med-High Med-Low** Low	2050 1955 1365 1225	– –	1960 1870 1300 1170	– –	1880 1800 1260 1115	– –	1800 1715 1220 1075	– –	1710 1655 1175 1035	– –	1630 1575 1120 985	– –	1550 1485 1045 935	–	1460 1390 955 865	37 38 56 62
																36 51 57
				39 44		41 46		42 48		44 50		45 52		48 54
		High*	1940	–	1860	36	1790	37	1710	39	1625	41	1540	43	1450	46	1355	49
SA090( )-35C Bottom Return	90,000	Med-High** Med-Low	1820 1290	37 52	1760 1245	38 54	1695 1200	39 56	1620 1155	41 58	1545 1110	43 60	1466 1060	45 63	1380 995	48	1280 915	52
																–		–
		Low	1145	58	1110	60	1070	62	1035	64	1000	–	950	–	905	–	835	–
		High*	2020	–	1935	–	1860	36	1780	37	1690	39	1600	42	1510	44	1410	47
SA090( )-35C Side Return	90,000	Med-High** Med-Low	1895 1345	35 50	1830 1295	36 51	1765 1250	38 53	1685 1200	40 56	1610 1155	41 58	1525 1100	44 61	1435 1035	46 64	1330 950	50
																		–
		Low	1190	56	1155	58	1115	60	1075	62	1040	64	980	–	940	–	870	–
SA090( )-35C Side + Bottom or 2 Sides	90,000	High* Med-High** Med-Low Low	2040 1910 1355 1205	–	1955 1850 1310 1165	–	1880 1780 1260 1125	35 37 53 59	1795 1700 1215 1085	37 39 55 61	1705 1625 1165 1050	39 41 57 63	1620 1540 1115 1000	41 43 60	1525 1450 1050 950	44 46 63	1425 1345 960 875	47 50
				35 49 55		36 51 57
																		– –
														–		–
		High*	2205	36	2150	37	2095	38	2030	39	1970	41	1900	42	1830	44	1740	46
SA108( )-35C Bottom Return	108,000	Med-High** Med-Low	2050 1700	39 47	1995 1680	40 48	1955 1645	41 49	1895 1610	42 50	1840 1565	43 51	1775 1525	45 52	1700 1460	47 55	1610 1375	50 58
		Low	1390	58	1370	58	1355	59	1320	61	1300	62	1270	63	1225	65	1175	–
		High*	2295	35	2235	36	2180	37	2110	38	2050	39	1975	41	1900	42	1810	44
SA108( )-35C Side Return	108,000	Med-High** Med-Low	2130 1770	38 45	2075 1750	39 46	2035 1710	39 47	1970 1675	41 48	1915 1630	42 49	1845 1585	43 50	1765 1520	45 53	1675 1430	48 56
		Low	1445	55	1425	56	1410	57	1375	58	1350	59	1320	61	1275	63	1225	65
		High*	2315	35	2260	35	2200	36	2130	38	2070	39	1995	40	1925	42	1825	44
SA108( )-35C Side + Bottom	108,000	Med-High** Med-Low	2155 1785	37 45	2095 1765	38 45	2055 1725	39 46	1990 1690	40 47	1930 1645	41 49	1865 1600	43 50	1785 1535	45 52	1690 1445	47 55
or 2 Sides		Low	1460	55	1440	56	1425	56	1385	58	1365	59	1335	60	1285	62	1235	65
		High*	2255	41	2200	42	2125	44	2065	45	2010	46	1935	48	1855	50	1755	53
SA126( )-45D Bottom only or 2 openings	126,000	Med-High** Med-Low	2075 1720	45 54	2025 1695	46 55	1970 1655	47 56	1940 1630	48 57	1875 1580	50 59	1810 1520	52 61	1750 1455	53 64	1680 1390	56 67
										–	1310	–	1300	–	1260	–	1230	–
		Low	1360	69	1375	68	1365	68	1315
		High*	2230	42	2180	43	2105	44	2045	46	1990	47	1915	49	1835	51	1740	54
SA126( )-45D Side Return	126,000	Med-High** Med-Low	2055 1705	45 55	2005 1680	47 56	1950 1640	48 57	1920 1615	49 58	1855 1565	50 60	1790 1505	52 62	1735 1440	54 65	1665 1375	56 68
		Low	1345	69	1360	69	1350	69	1300	–	1230	–	1290	–	1250	–	1220	–

Model Number	Heating Input (Btuh)	Motor Speed	External Static Pressure (Inches Water Column)
			0.1		0.2		0.3		0.4		0.5		0.6		0.7		0.8
			CFM	Rise	CFM	Rise	CFM	Rise	CFM	Rise	CFM	Rise	CFM	Rise	CFM	Rise	CFM	Rise
SK054( )-23A	54,000	High* Med-High Med-Low** Low	1375 1155 790 650	29 35 51	1340 1130 775 640	30 35 52	1300 1110 765 630	31 36 52	1270 1085 750 610	31 37 53	1225 1055 730 590	33 38 55	1175 1015 700 565	34 39	1115 975 665 530	36 41	1035 910 610 480	39 44
														– –		– –		– –
				–		–		–		–		–
SK072( )-24B	72,000	High* Med-High Med-Low** Low	1610 1295 1155 910	33 41 46 59	1590 1275 1135 885	34 42 47 60	1575 1260 1115 860	34 42 48	1560 1250 1095 835	34 43 49	1540 1220 1065 810	35 44 50	1495 1195 1040 785	36 45 51	1460 1170 1015 765	37 46 53	1415 1120 980 735	38 48 54
								–		–		–		–		–		–
SK090( )-24B	90,000	High* Med-High Med-Low** Low	1675 1330 1180 940	40 50 56	1655 1315 1165 925	40 51 57	1640 1300 1150 900	41 51 58	1620 1280 1135 880	41 52 59	1590 1255 1115 850	42 53 60	1560 1230 1090 825	43 54 61	1520 1200 1060 795	44 56 63	1475 1150 1010 760	45 58 66
				–		–		–		–		–		–		–		–
SK108( )-35C	108,000	High* Med-High Med-Low** Low	2395 2190 1785 1145	33 37 45	2335 2135 1770 1110	34 37 45	2285 2115 1740 1070	35 38 46	2230 2080 1725 1035	36 38 46	2200 2030 1685 1000	36 39 47	2140 1975 1645 950	37 41 49	2080 1915 1615 905	38 42 50	2000 1810 1565 835	40 44 51
				–		–		–		–		–		–		–		–
SK126( )-45D	126,000	High* Med-High Med-Low** Low	2445 2195 1795 1480	38 43 52 63	2395 2170 1780 1475	39 43 52 63	2385 2140 1770 1450	39 44 53 64	2330 2120 1760 1440	40 44 53 65	2275 2090 1725 1440	41 45 54 65	2225 2030 1690 1415	42 46 55	2130 1975 1655 1405	44 47 56	2015 1855 1610 1375	46 50 58
														–		–		–

NOTES:
Can be C or N

1. Two openings are required for airflows above 1600 CFM if filter(s) is(are) adjacent to furnace.
2. Factory Set Cooling Speed 2. Temperature rises in the table are approximate. Actual temperature rises may vary.
3. Factory Set Heating Speed 3. Temperature rises shaded in gray are not recommended.

NOTES:

Can be C or N

1. Factory Set Cooling Speed 1. Temperature rises in the table are approximate. Actual temperature rises may vary.
2. Factory Set Heating Speed 2. Temperature rises shaded in gray are not recommended.

MODEL IDENTIFICATION CODE

SPECIFICATIONS

FG7SA MODEL NUMBERS	-045-23A	-054-23A	-072-24B	-090-24B	-072-35C	-090-35C	-108-35C	-126-45D
Input – Btuh (a)	45,000	54,000	72,000	90,000	72,000	90,000	108,000	126,000
Heating Capacity – Btuh	36,000	43,200	57,600	72,000	57,600	72,000	86,400	100,800
AFUE	80.0	80.0	80.0	80.0	80.0	80.0	80.0	80.0
Blower D x W	10 x 6	10 x 6	11x 8	11 x 8	10 x 10	10 x 10	11 x 10	11 x 10
Motor H.P. – Speed – Type	1/3 – 4 – PSC	1/3 – 4 – PSC	1/2 – 4 – PSC	1/2 – 4 – PSC	1/2 – 4 – PSC	1/2 – 4 – PSC	1.0 – 4 – PSC	1.0 – 4 – PSC
Motor FLA	4.80	4.80	8.20	8.20	7.50	7.50	13.75	13.75
Rated Ext. SP – In. W.C.	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5
Temperature Rise Range – ºF	30-60	30-60	35-65	35-65	35-65	35-65	40-70	40-70
Shipping Weights	100lbs	100lbs	110lbs	115lbs	115lbs	120lbs	125lbs	145lbs

FG7SK MODEL NUMBERS	-054-23A	-072-24B	-090-24B	-108-35C	-126-45D
Input – Btuh (a)	54,000	72,000	90,000	108,000	126,000
Heating Capacity – Btuh	43,200	57,600	72,000	86,400	100,800
AFUE	80.0	80.0	80.0	80.0	80.0
Blower D x W	10 x 6	11 x 8	11 x 8	11 x 10	11 x 10
Motor H.P. – Speed – Type	1/3 – 4 – PSC	1/2 – 4 – PSC	1/2 – 4 – PSC	3/4 – 4 – PSC	1.0 – 4 -PSC
Motor FLA	4.80	8.20	8.20	13.75	13.75
Rated Ext. SP – In. W.C.	0.5	0.5	0.5	0.5	0.5
Temperature Rise Range – ºF	30-60	35-65	35-65	40-70	40-70
Shipping Weights	100lbs	110lbs	115lbs	125lbs	145lbs

ACCESSORIES

FG7S (A, K) KITS
Description	SKU
“A” Cabinet fixed speed, high efficiency, FSHE	904872
“B” Cabinet fixed speed, high efficiency, FSHE	904873
“C” Cabinet fixed speed, high efficiency, FSHE	904874
“D” Cabinet fixed speed, high efficiency, FSHE	904875
“A” Cabinet variable speed, high efficiency, VSHE	904876
“B” Cabinet variable speed, high efficiency, VSHE	904877
“C” Cabinet variable speed, high efficiency, VSHE	904878
“D” Cabinet variable speed, high efficiency, VSHE	904879
“A” Cabinet downflow sub base kit	902974
“B”, “C”, “D” Cabinet downflow sub base kit	904911
U.S. LP Conversion kit (0 to 10,000 ft.)	904914
Canada LP Conversion kit (0 to 4,500 ft.)	904915
Bottom return filter 20 per box, “A” cabinet	903088
Bottom return filter 20 per box, “B” cabinet	904916
Bottom return filter 20 per box, “C” cabinet	904917
Bottom return filter 20 per box, “D” cabinet	904918
Side return filter kit	541036

GENERAL TERMS OF LIMITED WARRANTY
Nortek Global HVAC, LLC will furnish a replacement for any part of this product which fails in normal use and service within the terms and conditions of the warranty.
For complete details of the Limited Warranty, including applicable terms and conditions, see your local installer or contact the Nortek Global HVAC, LLC warranty department for a copy.

Before purchasing this appliance, read important energy cost and efficiency information available from your retailer. Specifications and illustrations subject to change without notice and without incurring obligations. Printed in U.S.A (08/2016)

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NuTone® trademark used under license. © Nortek Global HVAC, LLC. All Rights Reserved.

Documents / Resources

NuTone FG7S (A and K Series) High Efficiency Upflow/Horizontal and Downflow Gas Furnaces [pdf] Owner's Manual FG7S A and K Series High Efficiency Upflow Horizontal and Downflow Gas Furnaces, FG7S A and K Series, High Efficiency Upflow Horizontal and Downflow Gas Furnaces, Efficiency Upflow Horizontal and Downflow Gas Furnaces, Upflow Horizontal and Downflow Gas Furnaces, Horizontal and Downflow Gas Furnaces, Downflow Gas Furnaces, Gas Furnaces, Furnaces

References

• User Manual