York G8C07516(MU, MD)B12, MD)C12, G8C10016(MU, G8C10020(MU Technical Manual

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TECHNICAL GUIDE

80 AFUE MULTI-POSITION GAS FURNACES

MODELS: G8C SERIES

4-POSITION 50-125 MBH INPUT

3-POSITION 150 MBH INPUT

EFFICIENCY RATING CERTIFIED

ISO 9001

Certified Quality

Management System

270844-YTG-A-0407

DESCRIPTION

These compact units (31-1/2" high) employ induced combustion, reliable electronic ignition and high heat transfer heat exchangers. The units may be factory shipped for upflow/horizontal application and converted for downflow application. These units may also be factory shipped for downflow application and converted for upflow/horizontal applications Note: The 150 MBH input model is upflow/horizontal only and may not be converted to the downflow position. These furnaces are designed for residential installation in a basement, closet, alcove, attic, or garage. All units are factory assembled, wired and tested to assure safe dependable and economical installation and operation. These units are Category I listed and may be common vented with another gas appliance as allowed by the National Fuel Gas Code.

WARRANTY

20-year limited warranty on the heat exchanger.

5-year limited parts warranty.

FEATURES

• 4-position (MU) upflow models allow horizontal-left, horizontal-right, downflow and convertible applications

• 4-position (MD) models allow downflow and convertible upflow/horizontal applications

• 3-position (UH) 150 MBH input model allows upflow, horizontal-left and horizontal-right application

• Reliable, hot surface ignitor

• Integrated control module for simplicity and reliable, economical operation

• Built-in self-diagnostics with fault code display

• 100% shut off main gas valve for added safety

• Rollout safety control

• Low unit amp requirement for easy application

• High quality inducer motor for quiet operation

• 40 VA, fuse protected control transformer

• Terminals for controlling humidifiers and EAC’s

• Easy to connect power and control wiring

• Efficiency ratings of 80 AFUE

• Cooling blower relay supplied for easy installation of addon cooling

• Blower off-delay for cooling SEER improvement

• Multi-speed PSC, direct-drive blower motors to match cooling requirements

• Adjustable fan-off settings to eliminate "cold-blow"

• Compact 31-1/2-in height allows installation in small space confines

• All models are propane convertible with factory kit

• Pre-painted exterior provides attractive, durable finish

• Models are not approved for LoNox applications

FOR DISTRIBUTION USE ONLY - NOT TO BE USED AT POINT OF RETAIL SALE

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270844-YTG-A-0407

DOWNFLOW

BOTTOM VIEW

29-3/4

UPFLOW

31-1/2

16-1/4

29-3/4

BOTTOM VIEW

CABINET AND DUCT DIMENSIONS

BTUH (kW)

Input

G8C05012(MU,MD)B12 G8C07512(MU,MD)B12 G8C07516(MU,MD)C12 G8C10016(MU,MD)C12 G8C10020(MU,MD)D11 G8C12520(MU,MD)D11

G8C15020UHD11

1. 4-position models may be factory configured as upflow (MU) or downflow (MD).

2. 3-position 150 MBH model available only in upflow/horizontal (UH) configuration.

4. Dimensions “B”, “C”, “D”, and “E” are with duct flanges turned up. “F”, “G”, “H”, & “J” are with flanges flat.

3. All models are supplied with 3” (7.62 cm) vent connections. An installer supplied transition to 4” (10.16 cm) or 5” (12.7 cm) must be used where necessary.

Nominal

CFM

1200 B 17 1/2 16 1/2 20 3/8 20.0 16 14 3/4 18 3/4 15 1/8 19.0 3

1200 B 17 1/2 16 1/2 20 3/8 20.0 16 14 3/4 18 3/4 15 1/8 19.0

1600 C 21 20 20 3/8 20.0 19 1/2 18 1/4 18 3/4 18 5/8 19.0

2000 D 24.5 23 1/2 20 3/8 20.0 23 21 3/4 18 3/4 22 1/8 19.0

2000 D 24 1/2 23 1/2 20 3/8 20.0 23 21 3/4 18 3/4 22 1/8 19.0

Cabinet

Size

A(in.) B(in.) C(in.) D(in.) E(in.) F(in.) G(in.) H(in.) J(in.) K Vent (in.)

Cabinet Dimension

2 Unitary Products Group

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RATINGS & PHYSICAL / ELECTRICAL DATA - UPFLOW MODELS

270844-YTG-A-0407

Models

G8C05012(MU,MD)B12 50 40 1200 17-1/2 8.0 80.0 30-60 G8C07512(MU,MD)B12 75 60 1200 17-1/2 8.0 80.0 35-65 G8C07516(MU,MD)C12 75 60 1600 21 11.4 80.0 30-60 G8C10016(MU,MD)C12 100 80 1600 21 11.4 80.0 40-70 G8C10020(MU,MD)D11 100 80 2000 24 1/2 11.3 80.0 35-65 G8C12520(MU,MD)D11 125 100 2000 24 1/2 11.3 80.0 40-70

G8C15020UHD11 150 120 2000 24 1/2 11.3 80.0 40-70

Models

G8C05012(MU,MD)B12 50 160 1/2 7.0 10 x 8 15 14 112 G8C07512(MU,MD)B12 75 165 1/2 7.0 10 x 8 15 14 118 G8C07516(MU,MD)C12 75 160 1/2 10.4 10 x 10 15 14 129 G8C10016(MU,MD)C12 100 170 1/2 10.4 10 x 10 15 14 135 G8C10020(MU,MD)D11 100 165 1 10.3 (2)10 x 6 15 14 149 G8C12520(MU,MD)D11 125 170 1 10.3 (2)10 x 6 15 14 155

G8C15020UHD11 150 170 1 10.3 (2)10 x 6 15 14 165

Nominal external static pressure is 0.50” w.c. at furnace outlet ahead of cooling coils. Annual Fuel Utilization Efficiency (AFUE) numbers are determined in accordance with DOE Test procedures. Wire size and over current protection must comply with the National Electrical Code (NFPA-70-latest edition) and all local codes.

Input Output Nominal Airflow Cabinet Width

MBH MBH CFM In. Amps °F

Input

MBH °F Hp Amps In. LBS

Max. Outlet

Air Temp

Blower

Size

Total

Unit

Max

Over-current

protect

AFUE

Min.Wire Size (awg) @ 75 ft.

one way

Air Temp.

Rise

Operation

Wt.

Unitary Products Group 3

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270844-YTG-A-0407

BLOWER PERFORMANCE

BTU/H (kW)

Input

G8C05012(MU,MD)B12

G8C07512(MU,MD)B12

G8C07516(MU,MD)C12

G8C10016(MU,MD)C12

G8C10020(MU,MD)D11

G8C12520(MU,MD)D11

G8C15020UHD11

G8C05012(MU,MD)B12

G8C07512(MU,MD)B12

G8C07516(MU,MD)C12

G8C10016(MU,MD)C12

G8C10020(MU,MD)D11

G8C12520(MU,MD)D11

G8C15020UHD11

Cabinet

Size

Speed

Tap

0.10.20.30.40.50.60.70.8

External Static Pressure, Inches WC - CFM

UPFLOW, SINGLE SIDE RETURN (WITHOUT FILTER)

High 1411 1360 1289 1218 1154 1075 983 882 Med 1213 1177 1134 1085 1022 960 880 782 Low 887 884 871 848 814 775 726 656 High 1535 1470 1408 1343 1275 1202 1115 1014 Med 1215 1199 1182 1151 1106 1039 976 887 Low 875 874 864 847 827 799 736 658 High 1792 1724 1630 1552 1462 1367 1264 1152 Med 1597 1555 1496 1444 1372 1287 1190 1086 Low 1115 1140 1167 1183 1149 1093 1023 939 High 1868 1781 1690 1600 1498 1396 1277 1156 Med 1602 1553 1503 1447 1376 1287 1181 1060 Low 1147 1147 1147 1147 1132 1078 1009 918 High

Med-High

Med-Low

Low High

Med-High

Med-Low

NOT ALLOWED

Low High

Med-High

Med-Low

Low

DUAL RETURN (TWO SIDES OR ONE-SIDE & BOTTOM)

High 1507 1433 1371 1300 1223 1132 1040 938 Med 1239 1215 1175 1144 1085 1012 938 838 Low 907 907 891 875 849 800 741 672 High 1634 1562 1484 1417 1340 1238 1154 1030 Med 1243 1228 1214 1184 1133 1079 999 912 Low 886 886 886 886 865 823 777 700 High 1978 1896 1803 1693 1589 1478 1366 1235 Med 1682 1657 1606 1530 1455 1366 1265 1137 Low 1235 1235 1235 1235 1198 1154 1083 987 High 2122 2027 1916 1821 1717 1590 1462 1312 Med 1667 1696 1656 1597 1523 1438 1330 1191 Low 1130 1145 1177 1194 1181 1146 1077 982 High 2350 2248 2129 2015 1876 1745 1596 1425

Med-High 2122 2018 1926 1824 1722 1606 1458 1311

Med-Low 1958 1875 1782 1690 1608 1491 1364 1213

Low 1820 1757 1664 1594 1506 1405 1287 1137 High 2483 2392 2282 2161 2032 1887 1739 1567

Med-High 2198 2123 2039 1930 1830 1708 1550 1413

Med-Low 1999 1916 1859 1778 1684 1576 1451 1315

Low 1832 1775 1709 1642 1556 1450 1335 1209 High 2570 2462 2361 2244 2128 1983 1826 1655

Med-High 2205 2105 2033 1952 1865 1738 1617 1459

Med-Low 1993 1931 1869 1880 1708 1590 1485 1330

Low 1831 1782 1722 1660 1575 1477 1364 1231

4 Unitary Products Group

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BLOWER PERFORMANCE (CONTINUED)

270844-YTG-A-0407

BTU/H (kW)

Input

G8C05012(MU,MD)B12

G8C07512(MU,MD)B12

G8C07516(MU,MD)C12

G8C10016(MU,MD)C12

G8C10020(MU,MD)D11

G8C12520(MU,MD)D11

G8C15020UHD11

1. Return air is through side opposite motor (left side) for one side return (worst case).

2. Airflows above 1800 CFM (50.97 m

3. Airflows expressed in standard cubic feet per minute (CFM) and in cubic meters per minute (m

Cabinet

Size

Speed

Tap

High 1419 1357 1297 1212 1131 1050 942 846 Med 1221 1185 1145 1092 1036 961 879 780 Low 920 902 883 860 818 761 711 639 High 1552 1491 1420 1348 1271 1185 1080 970 Med 1229 1237 1198 1164 1105 1039 956 861 Low 889 892 879 866 846 807 760 689 High 1946 1862 1775 1620 1518 1409 1291 1160 Med 1683 1611 1551 1484 1388 1300 1190 1080 Low 1110 1138 1175 1190 1175 1126 1041 937 High 1997 1920 1822 1723 1620 1500 1355 1211 Med 1728 1679 1635 1556 1465 1359 1249 1117 Low 1131 1156 1181 1190 1171 1126 1049 926 High 2327 2232 2121 1999 1888 1763 1628 1473

Med-High 2050 1967 1868 1757 1658 1525 1403 1260

Med-Low 1911 1839 1758 1675 1593 1468 1340 1189

High 1780 1712 1642 1566 1465 1366 1249 1094 High 2397 2304 2192 2063 1955 1822 1678 1521

Med-High 2151 2063 1977 1881 1774 1652 1528 1377

Med-Low 1972 1906 1838 1748 1660 1551 1419 1282

Low 1845 1794 1721 1646 1559 1451 1344 1208 High 2488 2389 2276 2151 2024 1883 1730 1577

Med-High 2164 2084 2024 1920 1816 1692 1558 1395

Med-Low 1998 1934 1868 1773 1673 1567 1445 1294

Low 1843 1793 1728 1653 1553 1453 1328 1192

/min) require either return from two sides or one side plus bottom

0.10.20.30.40.50.60.70.8

BOTTOM/END RETURN

External Static Pressure, Inches WC - CFM

/min).

RETURN AIR AND FILTERS

The return air ducts to the furnace must have a total cross sectional area of not less than two square inches per 1000 BTUH of furnace input rating for heating operation. If air con-

ditioning is to be inst alled with th e furnace, or if it may be added at a later time, larger return air ducts may be required, depending on the capacity of the air conditioner and the airflow required.

For applications requiring more than 1800 CFM, it is required to use the bottom return, both side returns or one side plus the bottom return.

• Single side return is not approved on 5 Ton models.

• 18” minimum height for return air box for bottom return only on Heating only applications with furnace in the upflow configuration.

• 24” minimum height for return air box for bottom return only on A/C applications with furnace in the upflow configuration.

FILTER PERFORMANCE

The airflow capacity data published in the “Blower Performance” table listed above represents blower performance WITHOUT filters. To determine the approximate blower performance of the system, apply the filter drop value for the filter being used or select an appropriate value from the “Filter Performance” table shown. The filter pressure drop values in the “Filter Performance” table shown are typical values for the type of filter listed and should only be used as a guideline. Actual pressure drop ratings for each filter type vary between filter manufacturers.

Unitary Products Group 5

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270844-YTG-A-0407

RECOMMENDED FILTER SIZE

UPFLOW

Side

Return

Models

Input Air Flow MBH CFM in. in.

Cabinet

Size

G8C05012(MU,MD)B12 50 1200 B 25 x 16 25 x 16 G8C07512(MU,MD)B12 75 1200 B 25 x 16 25 x 16 G8C07516(MU,MD)C12 75 1600 C 25 x 16 25 x 20 G8C10016(MU,MD)C12 100 1600 C 25 x 16 25 x 20 G8C10020(MU,MD)D11 100 2000 D (2) 25 x 16 24 x 24 G8C12520(MU,MD)D11 125 2000 D (2) 25 x 16 24 x 24

G8C15020UHD11 150 2000 D (2) 25 x 16 24 x 24

DOWNFLOW

Top Return (Downflow)

Cleanable Air Filters

Models

Input Air Flow MBH CFM in. in.

Cabinet

Size

G8C05012(MU,MD)B12 50 1200 B 14 x 20 (2) 10 x 20 G8C07512(MU,MD)B12 75 1200 B 14 x 20 (2) 14 x 20 G8C07516(MU,MD)C12 75 1600 C 16 x 20 (2) 16 x 20 G8C10016(MU,MD)C12 100 1600 C 16 x 20 (2) 16 x 20 G8C10020(MU,MD)D11 100 2000 D 20 x 20 (2) 20 x 20 G8C12520(MU,MD)D11 125 2000 D 20 x 20 (2) 20 x 20

G8C15020UHD11 150 2000 D N/A N/A

NOTES:

1. Air velocity through throwaway type filters may not exceed 300 feet per minute. All velocities over this require the use of high velocity filters.

2. Air flows above 1800 CFM require either return from two sides or one side plus bottom.

Bottom/End

Return

Top Return (Downflow)

Disposable Air Filters

FILTER PERFORMANCE - PRESSURE DROP INCHES W.C. AND (KPA)

Airflow Range

CFM

Minimum

Opening Size

Disposable Washable Fiber Pleated

In W.C. In W.C. In W.C.

0 - 750 230 0.01 0.01 0.15

751 - 1000 330 0.05 0.05 0.20 1001 - 1250 330 0.10 0.10 0.20 1251 - 1500 330 0.10 0.10 0.25 1501 - 1750 380 0.15 0.14 0.30 1751 - 2000 380 0.19 0.18 0.30

2001 & Above 463 0.19 0.18 0.30

Filter Type

6 Unitary Products Group

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270844-YTG-A-0407

APPLYING FILTER PRESSURE DROP T O DETERMINE SYSTEM AIRFLOW

To determine the approximate airflow of the unit with a filter in place, follow the steps below:

1. Select the filter type.

2. Select the number of return air openings or calculate the return opening size in square inches to determine the proper filter pressure drop.

3. Determine the External System Static Pressure (ESP) without the filter.

4. Select a filter pressure drop from the table based upon the number of return air openings or return air opening size and add to the ESP from Step 3 to determine the total system static.

5. If total system static matches a ESP value in the airflow table (i.e. 0.20 w.c., 0.60 w.c., etc.,) the system airflow corresponds to the intersection of the ESP column and Model/Blower Speed row.

6. If the total system static falls between ESP values in the table (i.e. 0.58 w.c., 0.75 w.c., etc.), the static pressure may be rounded to the nearest value in the table determining the airflow using Step 5 or calculate the airflow by

Example: For a 75,000 BTUH furnace with 2 return openings and operating on high-speed blower, it is found that total system static is 0.38” w.c. To determine the system airflow, complete the following steps:

Obtain the airflow values at 0.30 w.c. & 0.40 w.c. ESP. Airflow @ 0.30”: 1408 CFM Airflow @ 0.40”: 1343 CFM Subtract the airflow @ 0.30 w.c. from the airflow @ 0.40 w.c.

to obtain airflow difference. 1343 - 1408 = -65 CFM Subtract the total system static from 0.30 w.c. and divide this

difference by the difference in ESP values in the table, 0.40 w.c. - 0.30 w.c., to obtain a percentage.

(0.38 - 0.30) / (0.40 - 0.30) = 0.8 Multiply percentage by airflow difference to obtain airflow

reduction. (0.8) X (-65) = -52 Subtract airflow reduction value to airflow @ 0.30 w.c. to

obtain actual airflow @ 0.38 in. w.c. ESP. 1408 - 52 = 1356

using the following example.

UNIT CLEARANCES TO COMBUSTIBLES

Application Top Front Rear Left Side

Upflow 1 6 0 0 0 6 Combustible Yes Yes Yes No Upflow

B-Vent Horizontal 0 6 0 0 1 6 Combustible No Yes Yes Horizontal

B-Vent Downflow 1 6 0 0 5* 6 Downflow

B-Vent

1. Special floor base or air conditioning coil required for use on combustible floor.

2. Line contact only permitted between lines formed by the intersection of the rear panel and side panel (top in horizontal position) of the furnace jacket and building joists, studs or framing.

Cabinet clearance is "0", vent clearance is required.

1 2 0 0 0 1 Combustible Yes Yes Yes No

1 2 0 0 1 1 Combustible No Yes Yes

12 0 0 01

Right

Side

Flue

Floor /

Bottom

1" (See Note

Closet Alcove Attic

Yes Yes Yes No

)

Yes Yes Yes No

Line

Contact

Yes(See Note Yes(See Note

)

ACCESSORIES

Propane Conversion Kit (Standard) – 1NP0366

This accessory conversion kit may be used to convert natural gas units for propane (LP) operation at altitudes 0-2,000 ft. Conversion must be made by qualified distributor or dealer personnel.

Propane Conversion Kit (High Altitude) – 1PS0467

This accessory conversion kit may be used to convert natural gas units for propane (LP) operation at altitudes from 2,000 to 8,000 ft. Conversion must be made by qualified distributor or dealer personnel.

Natural Gas Conversion Kit (High Altitude) – 1PS0466

This accessory conversion kit may be used to convert natural gas units for high altitude operation at altitudes from 2,000 to 8,000 ft. Conversion must be made by qualified distributor or dealer personnel.

Unitary Products Group 7

Combustible Floor Base

This accessory is used for downflow applications on combustible surfaces.

17-1/2" "B" Cabinets 1FB0318 21" "C" Cabinets 1FB0319 24-1/2" "D" Cabinets 1FB0320

Bottom External Filter Rack

This accessory is used to upflow/bottom return air applications. Packaged and sold in quantities of six (6).

17-1/2" "B" Cabinets 1BR0312BK 21" "C" Cabinets 1BR0316BK 24-1/2" "D" Cabinets 1BR0320BK

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NOTES

Unitary 5005 Norman Products York OK Group Drive 73069