York GY8S Quick start guide

TECHNICAL GUIDE
LATITUDE
MODELS: GY8S/LY8S
GAS-FIRED
HIGH EFFICIENCY SINGLE STAGE
UPFLOW/HORIZONTAL FURNACES
STANDARD & LoNOx
NATURAL GAS
40 - 130 MBH INPUT
Due to continuous product improvement, specifica-
tions are subject to change without notice.
Visit us on the web at www.york.com for the most
up-to-date technical information.
Additional information can be found at
www.gamanet.org.
EFFICIENCY
RATING
CERTIFIED
This product was manufactured
in a plant whose quality system
is certified/registered as being
in conformity with ISO 9001.
036-21618-002 Rev. A (1004)
FOR DISTRIBUTION USE ONLY - NOT TO BE USED AT POINT OF RETAIL SALE
DESCRIPTION
These high efficiency, compact units employ induced com-
bustion, reliable hot surface ignition and high heat transfer
aluminized tubular heat exchangers. The units are factory
shipped for installation in upflow or horizontal applications.
These furnaces are designed for residential installation in a
basement, closet, alcove, attic, recreation room or garage
and are also ideal for commercial applications. All units are
factory assembled, wired and tested to assure safe depend-
able 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.
10-year heat exchanger warranty on commercial applica-
tions.
5-year limited parts warranty.
FEATURES
• Easily applied in upflow, horizontal left or horizontal right
installation with no conversion necessary
• 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
• Built-in self diagnostics with fault code display
• “Diamond Tough”™ hot surface igniter
• High velocity filter provided for field installation
• Standard terminals for controlling humidifiers and EAC's
• 40 VA control transformer fuse protected
• Easy to connect power and control wiring
• Efficiency ratings of 80 AFUE attained by using tubular
heat exchangers
• Cooling relay supplied for easy installation of add-on
cooling
• Multi-speed PSC, direct-drive blower motors to match
cooling requirements
• Adjustable fan-off settings to eliminate “cold-blow”
• Compact 40-in height allows installation in small space
confines
• Lo NOx models have been designed to meet specific
code requirements. Lo NOx units may not be converted
to propane.

036-21618-002 Rev. A (1004)
2Unitary Products Group
* Models available in LoNOx.
FRONT LEFT SIDE RIGHT SIDE
D
B20
40
A28-1/2
3/4
14-3/4
5-3/8
(VENT CONNECTIONS)
POWER WIRING
7/8” HOLE
2-1/2
ACCESS
WIRING
7/8” K.O.
16
8-3/4
T’STAT WIRING
7/8” K.O.
1-1/8
2-1/4
14
23-1/2
32-1/2
2
20
BC
A
3/4”
FLANGE
BOTTOM IMAGE
(FRONT)
TOP IMAGE
(FRONT)
VENT
CONNECTION
(Vent Size)
D
F
E
28-1/2
23
13-3/4
GAS INLET
1-1/4 x 2-1/2
CABINET AND DUCT DIMENSIONS
BTUH
Input/Output CFM Cabinet
Size Cabinet Dimension
ABCDEF
40/32* 1200 A 14 1/2 13 1/4 10 1/8 4.0 10 1/8 3 3/4
60/48* 1200 A 14 1/2 13 1/4 10 1/8 4.0 10 1/8 3 3/4
80/64* 1200 A 14 1/2 13 1/4 10 1/8 4.0 10 1/8 3 3/4
80/64* 1600 B 17 1/2 16 1/4 13 1/8 4.0 11 5/8 3 3/4
80/64* 2200 C 21 19 3/4 16 5/8 4.0 13 3/8 3 3/4
100/80* 1200 B 17 1/2 16 1/4 13 1/8 4.0 11 5/8 3 3/4
100/80* 1600 B 17 1/2 16 1/4 13 1/8 4.0 11 5/8 3 3/4
100/80* 2000 C 21 19 3/4 16 5/8 4.0 13 3/8 3 3/4
115/92 1600 C 21 19 3/4 16 5/8 4.0 13 3/8 3 3/4
115/92* 2000 C 21 19 3/4 16 5/8 4.0 13 3/8 3 3/4
130/104* 2000 D 24 1/2 23 1/4 20 1/8 4.0 15 1/8 3 3/4
HORIZONTAL VENTING-MUST USE FIELDS CONTROL MODELS SWG-4Y OR TJERENLAND MODEL GPAK-JT FIELD
SUPPLIED POWER VENTING KITS
Heating Heating Furnace Horizontal Vent Length Ft (m) with 4 Elbows
Input Output Airflow Pipe Size Min. Vent Length Max. Vent Length
BTU/H BTU/H CFM Inches Feet Feet
40,000 32,000 1200 4 4.5 34.5
60,000 48,000 1200 4 4.5 34.5
80,000 64,000 1200 4 4.5 34.5
80,000 64,000 1600 4 4.5 34.5
80,000 64,000 2200 4 4.5 34.5
100,000 80,000 1200 4 4.5 34.5
100,000 80,000 1600 4 4.5 34.5
100,000 80,000 2000 4 4.5 34.5
115,000 92,000 1600 4 4.5 34.5
115,000 92,000 2000 4 4.5 34.5
130,000 104,000 2000 4 4.5 34.5

036-21618-002 Rev. A (1004)
Unitary Products Group 3
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.
The furnace shall be installed so that the electrical components are protected from water.
* ESP (External Static Pressure) .5" WG is at furnace outlet ahead of cooling coil.
1. Airflows above 1800 CFM (50.97 m3/min) require either return from two sides or one side plus bottom.
2. Motor voltage at 115 V.
3. NR = Operation at this static pressure is not recommended.
RATINGS & PHYSICAL / ELECTRICAL DATA - UPFLOW MODELS
Input
MBH Output MBH Nominal CFM CabinetWidth In. AFUE Air Temp. Rise °F
40 32 1200 14-1/2 80.0 25-55
60 48 1200 14-1/2 80.0 25-55
80 64 1200 14-1/2 80.0 35-65
80 64 1600 17 1/2 80.0 25-55
80 64 2200 21 80.0 25-55
100 80 1200 17 1/2 80.0 40-70
100 80 1600 17 1/2 80.0 35-65
100 80 2000 21 80.0 25-55
115 92 1600 21 80.0 35-65
115 92 2000 21 80.0 30-60
130 104 2000 24-1/2 80.0 35-65
Input
MBH Max. Outlet Air Temp °F Blower Blower
Size In. Total Unit Amps
Max Over-current
Size (awg) @ 75 ft.
protect
Min.
Wire
one way
Operation
WGT. LBS
40 155 1/2 7.1 10 x 8 9.0 20 14 105
60 155 1/2 7.1 10 x 8 9.0 20 14 110
80 170 1/2 7.1 10 x 8 9.0 20 14 117
80 155 3/4 11.5 11 x 8 12.0 20 14 126
80 165 1.0 14 11 x 11 14.0 20 12 140
100 170 1/2 7.1 10 x 8 12.0 20 14 128
100 165 3/4 11.5 11 x 8 12.0 20 14 134
100 155 1.0 14 11 x 11 14.0 20 12 145
115 170 3/4 11.5 10 x 10 12.0 20 14 145
115 170 1.0 14 11 x 11 14.0 20 12 147
130 165 1.0 14 11 x 11 14.0 20 12 158
FILTER SIZES
BTU/H
Input / Output CFM Cabinet
Size Side (in) Bottom (in)
40/32 1200 A 16 x 25 14 x 25
60/48 1200 A 16 x 25 14 x 25
80/64 1200 A 16 x 25 14 x 25
80/64 1600 B 16 x 25 16 x 25
80/64 2200 C (2) 16 x 25 20 x 25
100/80 1200 B 16 x 25 16 x 25
100/80 1600 B 16 x 25 16 x 25
100/80 2000 C (2) 16 x 25 20 x 25
115/92 1600 C 16 x 25 20 x 25
115/92 2000 C (2) 16 x 25 20 x 25
130/104 2000 D (2) 16 x 25 22 x 25

036-21618-002 Rev. A (1004)
4Unitary Products Group
NOTES
1. Airflow expressed in standard cubic feet per minute (CFM) and in cubic meters per minute (m3/min).
2. Motor voltage at 115 V.
* Input / CFM / Cabinet Width (A=14-1/2, B=17-1/2, C=21, D=24-1/2)
† Indicates model available in LoNOx.
BLOWER PERFORMANCE CFM - UPFLOW (WITHOUT FILTER) - BOTTOM RETURN
MODELS
Input /
CFM Speed
Single Stage Bottom Airflow Data (SCFM)
Ext. Static Pressure (in. H2O)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
40/1200/A †
High 1610 1540 1460 1360 1290 1200 1110 1020 900 760
Medium High 1430 1390 1330 1250 1190 1110 1030 940 840 710
Medium Low 1200 1180 1140 1100 1050 1000 930 850 750 620
Low 980 980 960 920 890 840 790 720 620 530
60/1200/A †
High 1570 1490 1420 1340 1250 1180 1090 990 870 700
Medium High 1410 1360 1310 1250 1190 1090 1020 920 810 650
Medium Low 1200 1180 1150 1100 1050 990 920 830 700 580
Low 960 960 950 930 900 840 800 720 610 500
80/1200/A †
High 1590 1520 1460 1380 1300 1240 1150 1050 930 800
Medium High 1400 1360 1310 1260 1200 1140 1070 960 860 740
Medium Low 1180 1160 1130 1090 1040 990 920 840 750 640
Low 940 940 940 920 880 840 790 710 630 530
80/1600/B †High 1850 1820 1790 1750 1690 1630 1570 1500 1430 1330 Medium 1470 1450 1440 1430 1390 1360 1310 1270 1220 1150
Low 1260 1260 1260 1260 1250 1200 1150 1110 1070 1010
80/2200/C †
High 2490 2410 2320 2230 2130 2030 1900 1790 1630 1470
Medium High 2120 2060 2000 1970 1840 1730 1680 1570 1460 1260
Medium Low 1720 1700 1670 1620 1570 1500 1430 1310 1160 1000
Low 1410 1390 1360 1330 1280 1220 1170 1060 930 840
100/1200/B †
High 1700 1620 1560 1480 1390 1300 1210 1110 970 820
Medium High 1430 1400 1350 1300 1230 1160 1080 980 870 710
Medium Low 1180 1170 1160 1130 1080 1030 1000 860 750 510
Low 950 950 930 920 880 840 790 720 620 530
100/1600/B †High 1880 1850 1770 1720 1650 1560 1490 1420 1320 1210 Medium 1470 1460 1420 1390 1360 1300 1250 1190 1110 1000
Low 1250 1240 1220 1190 1150 1130 1070 1030 970 880
100/2000/C †
High 2590 2500 2400 2280 2180 2080 1970 1840 1720 1560
Medium High 2180 2120 2040 1980 1900 1810 1720 1600 1480 1320
Medium Low 1750 1720 1680 1640 1580 1520 1440 1350 1220 1060
Low 1450 1420 1380 1330 1300 1240 1160 1070 970 860
115/1600/C High 2020 1930 1820 1730 1640 1540 1400 1250 1090 920 Medium 1750 1710 1650 1590 1490 1390 1290 1160 1010 810
Low 1540 1500 1460 1410 1350 1260 1180 1060 910 750
115/2000/C †
High 2500 2400 2320 2220 2110 2000 1870 1750 1610 1450
Medium High 2130 2070 1990 1920 1840 1760 1660 1570 1460 1320
Medium Low 1700 1680 1650 1620 1560 1500 1410 1320 1210 1070
Low 1420 1390 1360 1330 1290 1240 1150 1060 950 840
130/2000/D †
High 2640 2550 2440 2340 2230 2110 2010 1870 1750 1580
Medium High 2120 2070 2010 1950 1890 1810 1730 1610 1490 1320
Medium Low 1690 1660 1640 1600 1550 1490 1410 1330 1240 1100
Low 1370 1360 1340 1310 1270 1230 1150 1070 990 850

036-21618-002 Rev. A (1004)
Unitary Products Group 5
NOTES
1. Airflow expressed in standard cubic feet per minute (CFM).
2. Return air is through side opposite motor (left side).
3. Motor voltage at 115 V.
* Input / CFM / Cabinet Width (A=14-1/2, B=17-1/2, C=21, D=24-1/2)
† Indicates model available in LoNOx.
BLOWER PERFORMANCE CFM - UPFLOW (WITHOUT FILTER) - LEFT SIDE RETURN
MODELS
Input /
CFM Speed
Single Stage Left Side Airflow Data (SCFM)
Ext. Static Pressure (in. H2O)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
40/1200/A †
High 1810 1730 1660 1570 1480 1390 1300 1200 1090 930
Medium High 1390 1390 1350 1320 1270 1210 1150 1080 970 790
Medium Low 1120 1120 1120 1110 1080 1080 1020 930 830 690
Low 880 910 920 920 910 870 820 740 650 510
60/1200/A †
High 1770 1690 1630 1560 1490 1390 1290 1190 1050 920
Medium High 1400 1380 1350 1320 1280 1230 1160 1060 930 780
Medium Low 1120 1130 1150 1130 1120 1080 1000 950 790 630
Low 880 900 900 900 880 850 790 730 660 530
80/1200/A †
High 1790 1720 1670 1590 1530 1450 1350 1260 1140 1000
Medium High 1420 1370 1350 1320 1280 1230 1170 1090 990 840
Medium Low 1080 1120 1110 1100 1080 1040 1000 920 820 690
Low N/A 900 900 890 870 850 800 730 670 560
80/1600/B †High 2000 1960 1930 1900 1800 1760 1710 1640 1550 1460 Medium 1440 1440 1430 1420 1400 1380 1340 1300 1220 1150
Low 1220 1230 1230 1230 1200 1190 1170 1160 1110 1050
80/2200/C †
High 2710 2640 2560 2480 2360 2260 2160 2010 1860 1650
Medium High 2110 2110 2070 2030 1980 1910 1850 1710 1570 1300
Medium Low 1690 1690 1650 1610 1540 1480 1410 1280 1170 1030
Low 1350 1330 1310 1290 1260 1220 1150 1050 970 860
100/1200/B †
High 1780 1710 1640 1560 1490 1390 1290 1180 1030 820
Medium High 1430 1410 1370 1340 1280 1220 1140 1040 890 730
Medium Low 1140 1170 1150 1120 1080 1040 970 890 760 630
Low 920 940 950 940 920 890 850 770 660 560
100/1600/B †High 1950 1890 1840 1790 1730 1660 1570 1480 1390 1300 Medium 1440 1420 1400 1390 1350 1320 1270 1210 1150 1060
Low 1230 1210 1190 1180 1150 1130 1090 1050 990 920
100/2000/C †
High 2770 2670 2610 2540 2450 2340 2210 2070 1890 1730
Medium High 2120 2060 2030 2000 1950 1880 1810 1720 1580 1370
Medium Low 1690 1660 1630 1610 1560 1490 1420 1350 1240 1070
Low 1390 1370 1330 1290 1250 1200 1120 1010 910 850
115/1600/C High 2160 2070 1990 1900 1800 1690 1580 1430 1260 1000 Medium 1760 1720 1690 1630 1560 1480 1390 1250 1080 890
Low 1510 1490 1470 1440 1380 1300 1210 1110 950 780
115/2000/C †
High 2740 2650 2560 2480 2380 2280 2170 1990 1840 1650
Medium High 2120 2090 2040 2000 1940 1870 1780 1680 1550 1370
Medium Low 1690 1670 1650 1610 1560 1510 1440 1310 1160 1030
Low 1390 1360 1330 1300 1250 1190 1100 1020 940 840
130/2000/D †
High 2680 2600 2520 2410 2300 2180 2050 1910 1730 1550
Medium High 2140 2110 2070 1990 1930 1850 1770 1670 1530 1370
Medium Low 1660 1640 1620 1570 1530 1470 1400 1310 1220 1090
Low 1370 1350 1320 1290 1240 1190 1140 1040 930 860

036-21618-002 Rev. A (1004)
6Unitary Products Group
FILTER PERFORMANCE
The airflow capacity data published in the “Blower Perfor-
mance” table listed above represents blower performance
WITHOUT filters. To determine the approximate blower per-
formance of the system, apply the filter drop value for the fil-
ter being used or select an appropriate value from the “Filter
Performance” table shown below.
NOTE: The filter pressure drop values in the “Filter Perfor-
mance” table shown below 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
manufacturer.
* Washable Fibers are the type supplied with furnace (if supplied).
APPLYING FILTER PRESSURE DROP TO
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 num-
ber 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. (50 Pa), 0.60 w.c. (150 Pa), etc,) the system air-
flow 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. (144 Pa), 0.75 w.c. (187 Pa), etc.), the static pres-
sure may be rounded to the nearest value in the table determin-
ing the airflow using Step 5 or calculate the airflow by using the
following example.
Example: For a 130,000 BTUH (38.06 kW) furnace with 2 return
openings and operating on high-speed blower, it is found that total
system static is 0.58” w.c. To determine the system airflow, complete
the following steps:
Obtain the airflow values at 0.50 w.c. (125 Pa) & 0.60 w.c. (150 Pa)
ESP.
Airflow @ 0.50”: 2125 CFM (60.17 m3/min)
Airflow @ 0.60”: 2035 CFM (57.62 m3/min)
Subtract the airflow @ 0.50 w.c. (125 Pa) from the airflow @ 0.60
w.c. (150 Pa) to obtain airflow difference.
2035 - 2125 = -90 CFM (2.55 m3/min)
Subtract the total system static from 0.50 w.c. (125 Pa) and divide
this difference by the difference in ESP values in the table, 0.60 w.c.
(150 Pa) - 0.50 w.c. (125 Pa), to obtain a percentage.
(0.58 - 0.50) / (0.60 - 0.50) = 0.8
Multiply percentage by airflow difference to obtain airflow reduction.
(0.8) X (-90) = -72
Subtract airflow reduction value to airflow @ 0.50 w.c. (125 Pa) to
obtain actual airflow @ 0.58 inwc (144 Pa) ESP.
2125 - 72 = 2053
BLK
WHT
GRN
BLK (HOT)
WHT (NEUTRAL)
GRN
NOMINAL
120 VOLT
FILTER PERFORMANCE - PRESSURE DROP INCHES W.C.
Airflow
Range Minimum Opening Size Filter Type
Disposable Washable Fibers* Pleated
1 Opening 2 Openings 1 Opening 2 Openings 1 Opening 2 Openings 1 Opening 2 Openings
CFM In³ In³ inwc inwc inwc inwc inwc inwc
0 - 750 230 0.01 0.01 0.15
751 - 1000 330 0.05 0.05 0.2
1001 - 1250 330 0.1 0.1 0.2
1251 - 1500 330 0.1 0.1 0.25
1501 - 1750 380 658 0.15 0.09 0.14 0.08 0.3 0.17
1751 - 2000 380 658 0.19 0.11 0.18 0.1 0.3 0.17
2001 & Above 463 658 0.19 0.11 0.18 0.1 0.3 0.17

036-21618-002 Rev. A (1004)
Unitary Products Group 7
ACCESSORIES
Propane Conversion Kit – 1NP0347 40, 80 & 100 MBH
1NP0348 60, 115 & 130 MBH
This accessory conversion kit may be used to convert natural
gas units for propane (LP) operation. Conversion must be
made by qualified distributor or dealer personnel.
High Altitude Pressure Switch Kits
These accessory kits may be used to convert units for high
altitude operation. Conversion must be made by qualified dis-
tributor or dealer personnel.
NOTE: For high altitude conversion, an orifice change may
also be required. See Form 650.74-N1.1V for application
information.
External Side Return Filter Rack - 1SR0302 (Upflow)
Provides a 16 x 25 cleanable, high velocity type filter and at-
taches to the furnace side panel and the return air duct.The
filteris easily replaced. Package contains six filter racks with
filters.
External Bottom Return Upflow or Horizontal End Return
Filter Rack
Provides a cleanable, high velocity type filter and rack.
Attaches to the end of the furnace and provides duct flanges.
1BR0314 - 14-1/2" "A" cabinet
1BR0317 - 17-1/2" "B" cabinet
1BR0321 - 21" "C" cabinet
1BR0324 - 24-1/2" "D" cabinet
UNIT CLEARANCES TO COMBUSTIBLES (ALL SURFACES IDENTIFIED WITH THE UNIT IN A VERTICAL POSITION)
APPLICATION TOP FRONT REAR LEFT
SIDE RIGHT SIDE FLUE FLOOR/
BOTTOM CLOSET ALCOVE ATTIC LINE CONTACT
UPFLOW 1 6 0 0 3 6 COMBUSTIBLE YES YES YES NO
UPFLOW B-VENT 1 3 0 0 0 1 COMBUSTIBLE YES YES YES NO
HORIZONTAL 1 6 0 0 3 6 COMBUSTIBLE NO YES YES YES1
HORIZ. B-VENT 1 3 0 0 0 1 COMBUSTIBLE NO YES YES YES1
1. Line contact only permitted between lines formed by the intersection of the rear panel and side panel (top in horizontal postion) of the furance jacket
and building joists, studs or framing.
Input
(MBH) Output (MBH) 2,000 Ft. to 5,500 Ft. >5,500 Ft. to 10,000 Ft.
40 32 1PS0301 1PS0301
60 48 1PS0301 1PS0301
80 64 1PS0302 1PS0302
100 80 1PS0312 1PS0311
115 92 1PS0312 1PS0311
130 104 1PS0312 1PS0311
FIELD INSTALLED ACCESSORIES - ELECTRICAL
MODEL NO. DESCRIPTION USED WITH
6TT03701124 TALKING THERMOSTAT - 1H/1C ALL MODELS
2TB17700424 SUBBASE (24V) -One-stage Heat / Cool. Manual changeover.
System Switch: Cool-Off-Heat. Fan Switch: Auto-On. ALL MODELS
2TH13700524 THERMOSTAT-One-stage heat. Deluxe 24V with heat only sub- base, does not include fan switch. NOTE: For one-stage cool or
one-stage heat/cool, must be used with subbase 2TB17700424. ALL MODELS
2ET03700324 THERMOSTAT- Hardwired, 1Heat / 1 Cool. Manual changeover.
System Switch: Cool-Off-Heat. Fan Switch: Auto-On. ALL MODELS
2ET03701224 THERMOSTAT-Power Stealing, 1 Heat /1 Cool. Manual
changeover. System Switch: Cool-Off-Heat. Fan Switch: Auto-On. ALL MODELS
2ET03700124 THERMOSTAT-Hardwired, 1 Heat / 1 Cool. Programmable, Auto
changeover. System Switch: Cool-Off-Heat. Fan Switch: Auto-On. ALL MODELS
2ET03701024 THERMOSTAT-Power Stealing, 1 Heat /1 Cool. Programmable, Auto changeover. System Switch: Cool-Off-Heat.
Fan Switch: Auto-On. ALL MODELS
2TC03700124 TWINNING CONTROL ALL MODELS

Subject to change without notice. Printed in U.S.A. 036-21618-002 Rev. A (1004)
Copyright © by Unitary Products Group 2004. All rights reserved. Supersedes: 036-21618-001 Rev. A (0804)
Unitary 5005 Norman
Products York OK
Group Drive 73069
NOTES