York G8C07512MDB12, G8C05012MDB12, G8C07516MDC12, G8C10016MUC12, G8C10016MDC12 Technical Manual

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

®

036-21120-002 Rev. A (1102)

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

• 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

036-21120-002 Rev. A (1102)

DOWNFLOW

BOTTOM VIEW

B

29-3/4

C

K

31-1/2

A

F

G

UPFLOW

31-1/2

D

A

J

E

K

16-1/4

14

29-3/4

H

BOTTOM VIEW

FURNACE DIMENSIONS

Model ABCDEFGHJK (Vent)

G8C05012(MU,MD)B12117-1/2 16-1/2 20-3/8 20 16 14-3/4 18-3/4 15-1/8 19 3

G8C07512(MU,MD)B12

G8C07516(MU,MD)C12

G8C10016(MU,MD)C12

G8C10020(MU,MD)D11124-1/2 23-1/2 20-3/8 20 23 21-3/4 18-3/4 22-1/8 19

G8C12520(MU,MD)D11124-1/2 23-1/2 20-3/8 20 23 21-3/4 18-3/4 22-1/8 19

G8C15020UHD11** 24-1/2 23-1/2 20-3/8 20 23 21-3/4 18-3/4 22-1/8 19

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

2. All models are supplied with 3" vent connections. An installer supplied transition to 4" or 5" must be used where necessary.
** 3-Position 150 MBH model available only in upflow/horizontal (UH) configuration.

Dimensions "B", "C", "D" & "E" are with duct flanges turned up. "F", "G", "H" & "J" are with flanges flat.

1

17-1/2 16-1/2 20-3/8 20 16 14-3/4 18-3/4 15-1/8 19

1

21 20 20-3/8 20 19-1/2 18-1/4 18-3/4 18-5/8 19

1

21 20 20-3/8 20 19-1/2 18-1/4 18-3/4 18-5/8 19

2

4

2

4

2

4

2

4

2

5

2

5

RATINGS & PHYSICAL/ELECTRICAL DATA

Heat

Model

Cap.

Input

MBH

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** 150 120 40-70 170 3/4 (2) 10 x 6 10.3 15 14

1. 4-Position models may be factory configured as upflow (MU) or downflow (MD) models.
** 3-Position 150 MBH model available only in upflow/horizontal (UH) configuration.

NOTE: For altitudes above 2,000 ft., reduce capacity 4% for each 1,000 ft. above sea level.

Wire size based on copper conductors, 60° C, 3% voltage drop.
Continuous return air temperature must not be below 55° F.

1

50 40 30-60 160 1/3 10 x 8 6.7 15 14

1

75 60 35-65 165 1/3 10 x 8 6.7 15 14

1

75 60 30-60 160 1/2 10 x 10 8.5 15 14

1

100 80 40-70 170 1/2 10 x 10 8.5 15 14

1

100 80 35-65 165 3/4 (2) 10 x 6 10.3 15 14

1

125 100 40-70 170 3/4 (2) 10 x 6 10.3 15 14

2 Unitary Products Group

Output

MBH

Air Temp

Rise °F

Max.

Outlet

Temp . °F

Blower

HP Size

Tota l

Unit

Amps

Max.

Over­Current
Breaker

Min. Wire

Size (AWG)

@ 75 Ft.

One Way

BLOWER PERFORMANCE

TABLE 1: SINGLE SIDE RETURN -

All airflow is expressed in standard cubic feet per minute. Motor rated at 115 volts. No air filters.

MODEL

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

SPEED

TAP

HIGH 1411 1360 1289 1218 1154 1075 983 882

MEDIUM 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

MEDIUM 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

MEDIUM 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

MEDIUM 1602 1553 1503 1447 1376 1287 1181 1060

LOW 1147 1147 1147 1147 1132 1078 1009 918

HIGH
MED. HI
MED.LO

LOW

HIGH
MED. HI
MED.LO

LOW

HIGH
MED. HI
MED.LO

LOW

036-21120-002 Rev. A (1102)

EXTERNAL STATIC PRESSURE, INCHES W.C.

0.10.20.30.40.50.60.70.8

NOT APPROVED

TABLE 2: DUAL RETURN (TWO SIDES OR ONE SIDE & BOTTOM)-

All airflow is expressed in standard cubic feet per minute. Motor rated at 115 volts. No air filters.

MODEL

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

SPEED

TAP

HIGH 1507 1433 1371 1300 1223 1132 1040 938

MEDIUM 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

MEDIUM 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

MEDIUM 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

MEDIUM 1667 1696 1656 1597 1523 1438 1330 1191

LOW 1130 1145 1177 1194 1181 1146 1077 982

HIGH 2297 2200 2088 1980 1873 1753 1610 1453
MED. HI 1712 1677 1608 1551 1483 1380 1278 1147
MED.LO 1569 1569 1501 1453 1420 1323 1211 1088

LOW 1439 1439 1416 1369 1307 1218 1121 1004

HIGH 2377 2303 2207 2106 1983 1864 1717 1557
MED. HI 1704 1684 1656 1614 1542 1458 1361 1228
MED.LO 1524 1520 1512 1467 1418 1353 1266 1142

LOW 1368 1395 1391 1386 1343 1262 1188 1072

HIGH 2426 2336 2246 2143 2023 1897 1766 1590
MED. HI 1654 1654 1619 1591 1533 1456 1342 1199
MED.LO 1528 1528 1503 1467 1417 1340 1238 1107

LOW 1395 1374 1369 1325 1288 1231 1177 1071

0.10.20.30.40.50.60.70.8

EXTERNAL STATIC PRESSURE, INCHES W.C.

Unitary Products Group 3