York G8C Series Quick start guide

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
036-21120-001 Rev. A (201)
FOR DISTRIBUTION USE ONLY - NOT TO BE USED AT POINT OF RETAIL SALE
®
DESCRIPTION
These compact units (31-1/2" high) employ induced combus-
tion, reliable electronic ignition and high heat transfer heat
exchangers. The units may be factory shipped for upflow/hor-
izontal application and converted for downflow application.
These units may alsp be factory shipped for downflow appli-
cation 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 unitsare 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.
FEATURES
• 4-position (MU) upflow models allow horizontal-left, hori-
zontal-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, hori-
zontal-left and horizontal-right application
• Reliable, hot surface ignitor
• Integrated control module for simplicity and reliable, eco-
nomical 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 add-
on 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
• Prepainted exterior provides attractive, durable finish
• Models are not approved for LoNox applications
WARRANTY
20-year limited warranty on the heat exchanger.
5-year limited parts warranty.

036-21120-001 Rev. A (201) YORK
2Unitary Products Group
FURNACE DIMENSIONS
RATINGS & PHYSICAL/ELECTRICAL DATA
1 May be subtituted as G8C*****MD for factory shipped downflow models.
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.
MODEL ABCDEFGHJK(VENT)
G8C05012MUB111
1May be subtituted as G8C*****MD for factory shipped downflow models.
17-1/2 16-1/2 20-3/8 20 16 14-3/4 18-3/4 15-1/8 19 3
G8C07512MUB11117-1/2 16-1/2 20-3/8 20 16 14-3/4 18-3/4 15-1/8 19 42
2 All models are supplied with 3" vent connections. An installer supplied transition to 4" or 5" must be used where necessary.
** Upflow / Horizontal only.
Dimensions "B", "C", "D" & "E" are with duct flanges turned up. "F", "G", "H" & "J" are with flanges flat.
G8C07516MUC11121 20 20-3/8 20 19-1/2 18-1/4 18-3/4 18-5/8 19 42
G8C10016MUC11121 20 20-3/8 20 19-1/2 18-1/4 18-3/4 18-5/8 19 42
G8C10020MUD11124-1/2 23-1/2 20-3/8 20 23 21-3/4 18-3/4 22-1/8 19 42
G8C12520MUD11124-1/2 23-1/2 20-3/8 20 23 21-3/4 18-3/4 22-1/8 19 52
G8C15020UHD11** 24-1/2 23-1/2 20-3/8 20 23 21-3/4 18-3/4 22-1/8 19 52
MODEL HEAT
CAP.
INPUT
MBH
OUTPUT
MBH AIR TEMP RISE °FMAX.
OUTLET
TEMP. °F
BLOWER TOTAL
UNIT
AMPS
MAX.
OVER-
CURRENT
BREAKER
MIN. WIRE
SIZE (AWG)
@ 75 FT.
ONE WAY
HP SIZE
G8C05012MUB11150 40 30-60 160 1/3 10 x 8 6.7 15 14
G8C07512MUB11175 60 35-65 165 1/3 10 x 8 6.7 15 14
G8C07516MUC11175 60 30-60 160 1/2 10 x 10 8.5 15 14
G8C10016MUC111100 80 40-70 170 1/2 10 x 10 8.5 15 14
G8C10020MUD111100 80 35-65 165 3/4 (2) 10 x 6 10.3 15 14
G8C12520MUD111125 100 40-70 170 3/4 (2) 10 x 6 10.3 15 14
G8C15020UHD11** 150 120 40-70 170 3/4 (2) 10 x 6 10.3 15 14
DOWNFLOW UPFLOW
AA
BE
D
BOTTOM VIEW
F
G
29-3/4 29-3/4
C
31-1/2
31-1/2
14
BOTTOM VIEW
H
J
16-1/4
K
K

YORK 036-21120-001 Rev. A (201)
Unitary Products Group 3
BLOWER PERFORMANCE
UPFLOW, SINGLE SIDE RETURN APPLICATIONS
Airflow is expressed in standard cubic feet per minute.
Motor voltage at 115V.
UPFLOW, BOTTOM OR TWO SIDE RETURN, & HORIZONTAL END RETURN APPLICATIONS
Airflow is expressed in standard cubic feet per minute.
Motor voltage at 115V.
DOWNFLOW APPLICATION
Airflow is expressed in standard cubic feet per minute.
Motor voltage at 115V.
MODEL SPEED
TAP EXTERNAL STATIC PRESSURE, INCHES W.C.
0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80
G8C05012MUB11
G8C07512MUB11
HIGH 1338 1309 1267 1220 1144 1070 987 892
MED 1106 1092 1081 1048 999 938 874 790
LOW 863 860 859 845 804 764 718 651
G8C07516MUC11
G8C10016MUC11
HIGH 1701 1654 1619 1569 1495 1424 1333 1229
MED-HI 1524 1509 1468 1419 1350 1268 1176 1053
MED-LOW 1306 1300 1279 1260 1216 1156 1075 963
LOW 1107 1132 1136 1111 1081 1024 963 871
G8C10020MUD11
G8C12520MUD11
G8C15020UHD11
HIGH 2020 1927 1816 1733 1602 1491 1343 1201
MED-HI 1650 1586 1450 1361 1347 1307 1208 995
MED-LOW 1440 1428 1368 1310 1226 1144 1041 919
LOW 1321 1308 1266 1224 1165 1069 963 866
MODEL SPEED
TAP EXTERNAL STATIC PRESSURE, INCHES W.C.
0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80
G8C05012MUB11
G8C07512MUB11
HIGH 1407 1367 1315 1279 1211 1138 1053 961
MED 1141 1130 1092 1059 1009 945 876 782
LOW 885 894 881 863 811 782 719 649
G8C07516MUC11
G8C10016MUC11
HIGH 1776 1736 1717 1664 1608 1536 1445 1347
MED-HI 1588 1558 1515 1459 1403 1298 1203 1082
MED-LOW 1357 1357 1335 1317 1266 1193 1099 990
LOW 1151 1146 1124 1102 1052 969 879 860
G8C10020MUD11
G8C12520MUD11
G8C15020UHD11
HIGH 2414 2328 2228 2124 2013 1873 1734 1568
MED-HI 1742 1727 1694 1653 1597 1517 1383 1263
MED-LOW 1626 1591 1555 1540 1487 1400 1299 1179
LOW 1454 1462 1460 1455 1407 1332 1225 1098
MODEL1SPEED
TAP EXTERNAL STATIC PRESSURE, INCHES W.C.
0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80
G8C05012MUB11
G8C07512MUB11
HIGH 1445 1343 1328 1248 1165 1063 950 819
MED 1186 1164 1136 1084 1010 930 835 719
LOW 934 934 913 884 835 771 684 583
G8C07516MUC11
G8C10016MUC11
HIGH 1839 1759 1684 1613 1513 1397 1270 1110
MED-HI 1610 1561 1447 1428 1360 1256 1147 1016
MED-LOW 1416 1395 1360 1307 1242 1162 1050 930
LOW 1213 1223 1198 1178 1131 1060 984 875
G8C10020MUD11
G8C12520MUD11
HIGH 2341 2261 2154 2042 1914 1800 1653 1504
MED-HI 1791 1743 1714 1664 1581 1496 1386 1258
MED-LOW 1640 1598 1554 1533 1473 1386 1276 1165
LOW 1445 1453 1421 1402 1334 1266 1175 1050
1 May be subtituted as G8C*****MD for factory shipped downflow models.

YORK
Subject to change without notice. Printed in U.S.A. 036-21120-001 Rev. A (201)
Copyright © by York International Corp. 2001. All rights reserved Supersedes: 650.66-TG2Y (998)
Unitary 5005 Norman
Products York OK
Group Drive 73069
RECOMMENDED FILTER SIZE/ADD-ON COOLING
NOTE:1. Special floor base or air conditioning coil required for use on combustible floor.
NOTE: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.
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..
Con version must be made by qualified distributor or dealer
personnel.
PROPANE CONVERSION KIT (HIGH ALTITUDE) –
1NP0367
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.
COMBUSTIBLE FLOOR BASE
This accessory is used for downflow applications on combus-
tible 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 applica-
tions.
17-1/2" "B" Cabinets 1BR0312
21" "C" Cabinets 1BR0316
24-1/2" "D" Cabinets 1BR0320
UPFLOW / HORZ.
MODELS FILTER SIZE ADD-ON COOLING APPROX. OPER. WEIGHT
Side1
1 All filters must be external to the cabinet.
Bottom / End Downflow Tons CFM @ .5 ESP2
2 ESP (External Static Pressure) .5” W.C. is at furnace outlet ahead of cooling coil.
NOTE:Filters must be field supplied
High velocity type must be used.
Air flows above 1800 CFM require either return from two sides or bottom.
UNIT CLEARANCES TO COMBUSTIBLES
G8C05012MUB11 25 x 16 24 x 15 (2) 10 x 20 2, 2-1/2, 3 1200 112
G8C07512MUB11 25 x 16 24 x 15 (2) 14 x 20 2, 2-1/2, 3 1200 118
G8C07516MUC11 25 x 16 24 x 18 (2) 16 x 20 2-1/2, 3, 3-1/2, 4 1600 129
G8C10016MUC11 25 x 16 24 x 18 (2) 16 x 20 2-1/2, 3, 3-1/2, 4 1600 135
G8C10020MUD11 (2) 25 x 16 24 x 21 (2) 20 x 20 3, 3-1/2, 4, 5 2000 149
G8C12520MUD11 (2) 25 x 16 24 x 21 (2) 20 x 20 3, 3-1/2, 4, 5 2000 155
G8C15020UHD11 (2) 25 x 16 24 x 21 N/A 3, 3-1/2, 4, 5 2000 165
APPLICATION TOP FRONT REAR LEFT
SIDE RIGHT SIDE FLUE FLOOR / BOTTOM CLOSET ALCOVE ATTIC LINE CONTACT
UPFLOW 1 6 0 0 0 6 COMBUSTIBLE YES YES YES NO
UPFLOW
B-VENT 1 2 0 0 0 1 COMBUSTIBLE YES YES YES NO
HORIZONTAL 0 6 0 0 1 6 COMBUSTIBLE NO YES YES YES(See Note2)
HORIZONTAL
B-VENT 1 2 0 0 1 1 COMBUSTIBLE NO YES YES YES(See Note2)
DOWNFLOW 1 6 0 0 5* 6 1" (See Note1)YES YES YES NO
DOWNFLOW
B-VENT 12 0 0 01
1" (See Note1) YES YES YES NO