036-21618-003 Rev. A (1205)
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.
TECHNICAL GUIDE
These units are Category I listed and may be common vented
with another gas appliance as allowed by the National Fuel
Gas Code.
MODELS: GY8S/LY8S
GAS-FIRED
HIGH EFFICIENCY SINGLE STAGE
UPFLOW/HORIZONTAL FURNACES
STANDARD & Low NOx
WARRANTY
20-year limited warranty on the heat exchanger.
10-year heat exchanger warranty on commercial applica-
tions.
NATURAL GAS
5-year limited parts warranty.
40 - 130 MBH INPUT
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.
Electronic Hot Surface Ignition saves fuel cost with
increased dependability and reliability.
•
•
•
•
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.
EFFICIENCY
RATING
CERTIFIED
Multi-speed PSC, large, quiet direct-drive blower motor
to match cooling requirements.
•
•
Adjustable fan-off settings to eliminate “cold-blow”.
Compact 40-in height allows installation in small space
confines.
ISO 9001
Certified Quality
Management System
•
Low NOx models have been designed to meet specific
code requirements. Low NOx units may not be converted
to propane.
Due to continuous product improvement, specifica-
tions are subject to change without notice.
up-to-date technical information.
Additional information can be found at
FOR DISTRIBUTION USE ONLY - NOT TO BE USED AT POINT OF RETAIL SALE
036-21618-003 Rev. A (1205)
RATINGS & PHYSICAL / ELECTRICAL DATA - UPFLOW MODELS
Nominal
Input
Output Cabinet Width
AFUE
Air Temp. Rise
Airflow
Models
Total Unit Amps
MBH
40
MBH
32
In.
CFM
%
°F
(G,L)Y8S040A12UH11
(G,L)Y8S060A12UH11
(G,L)Y8S080A12UH11
(G,L)Y8S080B16UH11
14-1/2
14-1/2
14-1/2
17-1/2
1200
1200
1200
1600
9.0
9.0
80.0
80.0
80.0
80.0
25-55
25-55
35-65
25-55
60
48
80
64
9.0
80
64
12.0
GY8S080C22UH11
LY8S080C20UH11
80
64
21
2200
14.0
80.0
25-55
(G,L)Y8S100B12UH11
(G,L)Y8S100B16UH11
(G,L)Y8S100C20UH11
GY8S115C16UH11
100
100
100
115
115
130
80
80
17-1/2
17-1/2
21
1200
1600
2000
1600
2000
2000
12.0
12.0
14.0
12.0
14.0
14.0
80.0
80.0
80.0
80.0
80.0
80.0
40-70
35-65
25-55
35-65
30-60
35-65
80
92
21
(G,L)Y8S115C20UH11
(G,L)Y8S130D20UH11
92
21
104
24-1/2
Max. Outlet
Air Temp
Operation
WGT.
Max
Over-Current
Protect
Min. wire Size
(awg) @ 75 ft
one way
Blower
Blower Size
Models
°F
Hp
Amps
7.1
In.
LBS
105
110
117
126
(G,L)Y8S040A12UH11
(G,L)Y8S060A12UH11
(G,L)Y8S080A12UH11
(G,L)Y8S080B16UH11
155
155
170
155
1/2
1/2
1/2
3/4
10 x 8
10 x 8
10 x 8
11 x 8
20
20
20
20
14
14
14
14
7.1
7.1
11.5
GY8S080C22UH11
LY8S080C20UH11
165
1.0
14.0
11 x 11
20
12
140
(G,L)Y8S100B12UH11
(G,L)Y8S100B16UH11
(G,L)Y8S100C20UH11
GY8S115C16UH11
170
165
155
170
170
165
1/2
3/4
1.0
3/4
1.0
1.0
7.1
10 x 8
11 x 8
20
20
20
20
20
20
14
14
12
14
12
12
128
134
145
145
147
158
11.5
14.0
11.5
14.0
14.0
11 x 11
10 x 10
11 x 11
11 x 11
(G,L)Y8S115C20UH11
(G,L)Y8S130D20UH11
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.
Unitary Products Group
3
036-21618-003 Rev. A (1205)
BLOWER PERFORMANCE CFM - UPFLOW (WITHOUT FILTER) - BOTTOM RETURN
Single Stage Bottom Airflow Data (SCFM)
Ext. Static Pressure (in. H2O)
Models
Speed
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
900
1.0
760
High
Medium High
Medium Low
Low
1610
1430
1200
980
1540
1390
1180
980
1460
1330
1140
960
1360
1250
1100
920
1290
1190
1050
890
1200
1110
1000
840
1110
1030
930
1020
940
840
710
(G,L)Y8S040A12UH11
850
750
620
790
720
620
530
High
1570
1410
1200
960
1490
1360
1180
960
1420
1310
1150
950
1340
1250
1100
930
1250
1190
1050
900
1180
1090
990
1090
1020
920
990
870
700
Medium High
Medium Low
Low
920
810
650
(G,L)Y8S060A12UH11
830
700
580
840
800
720
610
500
High
1590
1400
1180
940
1520
1360
1160
940
1460
1310
1130
940
1380
1260
1090
920
1300
1200
1040
880
1240
1140
990
1150
1070
920
1050
960
930
800
Medium High
Medium Low
Low
860
740
(G,L)Y8S080A12UH11
(G,L)Y8S080B16UH11
840
750
640
840
790
710
630
530
High
1850
1470
1260
2490
2120
1720
1410
1700
1430
1180
950
1820
1450
1260
2410
2060
1700
1390
1620
1400
1170
950
1790
1440
1260
2320
2000
1670
1360
1560
1350
1160
930
1750
1430
1260
2230
1970
1620
1330
1480
1300
1130
920
1690
1390
1250
2130
1840
1570
1280
1390
1230
1080
880
1630
1360
1200
2030
1730
1500
1220
1300
1160
1030
840
1570
1310
1150
1900
1680
1430
1170
1210
1080
1000
790
1500
1270
1110
1790
1570
1310
1060
1110
980
1430
1220
1070
1630
1460
1160
930
1330
1150
1010
1470
1260
1000
840
Medium
Low
High
Medium High
Medium Low
Low
GY8S080C22UH11
LY8S080C20UH11
High
970
820
Medium High
Medium Low
Low
870
710
(G,L)Y8S100B12UH11
(G,L)Y8S100B16UH11
(G,L)Y8S100C20UH11
GY8S115C16UH11
860
750
510
720
620
530
High
1880
1470
1250
2590
2180
1750
1450
2020
1750
1540
2500
2130
1700
1420
2640
2120
1690
1370
1850
1460
1240
2500
2120
1720
1420
1930
1710
1500
2400
2070
1680
1390
2550
2070
1660
1360
1770
1420
1220
2400
2040
1680
1380
1820
1650
1460
2320
1990
1650
1360
2440
2010
1640
1340
1720
1390
1190
2280
1980
1640
1330
1730
1590
1410
2220
1920
1620
1330
2340
1950
1600
1310
1650
1360
1150
2180
1900
1580
1300
1640
1490
1350
2110
1840
1560
1290
2230
1890
1550
1270
1560
1300
1130
2080
1810
1520
1240
1540
1390
1260
2000
1760
1500
1240
2110
1810
1490
1230
1490
1250
1070
1970
1720
1440
1160
1400
1290
1180
1870
1660
1410
1150
2010
1730
1410
1150
1420
1190
1030
1840
1600
1350
1070
1250
1160
1060
1750
1570
1320
1060
1870
1610
1330
1070
1320
1110
970
1210
1000
880
Medium
Low
High
1720
1480
1220
970
1560
1320
1060
860
Medium High
Medium Low
Low
High
1090
1010
910
920
Medium
Low
810
750
High
1610
1460
1210
950
1450
1320
1070
840
Medium High
Medium Low
Low
(G,L)Y8S115C20UH11
High
1750
1490
1240
990
1580
1320
1100
850
Medium High
Medium Low
Low
(G,L)Y8S130D20UH11
NOTES
1. Airflow expressed in standard cubic feet per minute (CFM).
2. Motor voltage at 115 V.
4
Unitary Products Group
036-21618-003 Rev. A (1205)
BLOWER PERFORMANCE CFM - UPFLOW (WITHOUT FILTER) - LEFT SIDE RETURN
Single Stage Left Side Airflow Data (SCFM)
Ext. Static Pressure (in. H2O)
Models
Speed
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1090
970
1.0
930
High
Medium High
Medium Low
Low
1810
1390
1120
880
1730
1390
1120
910
1660
1350
1120
920
1570
1320
1110
920
1480
1270
1080
910
1390
1210
1080
870
1300
1150
1020
820
1200
1080
930
790
(G,L)Y8S040A12UH11
830
690
740
650
510
High
1770
1400
1120
880
1690
1380
1130
900
1630
1350
1150
900
1560
1320
1130
900
1490
1280
1120
880
1390
1230
1080
850
1290
1160
1000
790
1190
1060
950
1050
930
920
Medium High
Medium Low
Low
780
(G,L)Y8S060A12UH11
790
630
730
660
530
High
1790
1420
1080
N/A
1720
1370
1120
900
1670
1350
1110
900
1590
1320
1100
890
1530
1280
1080
870
1450
1230
1040
850
1350
1170
1000
800
1260
1090
920
1140
990
1000
840
Medium High
Medium Low
Low
(G,L)Y8S080A12UH11
(G,L)Y8S080B16UH11
820
690
730
670
560
High
2000
1440
1220
2710
2110
1690
1350
1780
1430
1140
920
1960
1440
1230
2640
2110
1690
1330
1710
1410
1170
940
1930
1430
1230
2560
2070
1650
1310
1640
1370
1150
950
1900
1420
1230
2480
2030
1610
1290
1560
1340
1120
940
1800
1400
1200
2360
1980
1540
1260
1490
1280
1080
920
1760
1380
1190
2260
1910
1480
1220
1390
1220
1040
890
1710
1340
1170
2160
1850
1410
1150
1290
1140
970
1640
1300
1160
2010
1710
1280
1050
1180
1040
890
1550
1220
1110
1860
1570
1170
970
1460
1150
1050
1650
1300
1030
860
Medium
Low
High
Medium High
Medium Low
Low
GY8S080C22UH11
LY8S080C20UH11
High
1030
890
820
Medium High
Medium Low
Low
730
(G,L)Y8S100B12UH11
(G,L)Y8S100B16UH11
(G,L)Y8S100C20UH11
GY8S115C16UH11
760
630
850
770
660
560
High
1950
1440
1230
2770
2120
1690
1390
2160
1760
1510
2740
2120
1690
1390
2680
2140
1660
1370
1890
1420
1210
2670
2060
1660
1370
2070
1720
1490
2650
2090
1670
1360
2600
2110
1640
1350
1840
1400
1190
2610
2030
1630
1330
1990
1690
1470
2560
2040
1650
1330
2520
2070
1620
1320
1790
1390
1180
2540
2000
1610
1290
1900
1630
1440
2480
2000
1610
1300
2410
1990
1570
1290
1730
1350
1150
2450
1950
1560
1250
1800
1560
1380
2380
1940
1560
1250
2300
1930
1530
1240
1660
1320
1130
2340
1880
1490
1200
1690
1480
1300
2280
1870
1510
1190
2180
1850
1470
1190
1570
1270
1090
2210
1810
1420
1120
1580
1390
1210
2170
1780
1440
1100
2050
1770
1400
1140
1480
1210
1050
2070
1720
1350
1010
1430
1250
1110
1990
1680
1310
1020
1910
1670
1310
1040
1390
1150
990
1300
1060
920
Medium
Low
High
1890
1580
1240
910
1730
1370
1070
850
Medium High
Medium Low
Low
High
1260
1080
950
1000
890
Medium
Low
780
High
1840
1550
1160
940
1650
1370
1030
840
Medium High
Medium Low
Low
(G,L)Y8S115C20UH11
High
1730
1530
1220
930
1550
1370
1090
860
Medium High
Medium Low
Low
(G,L)Y8S130D20UH11
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.
Unitary Products Group
5
036-21618-003 Rev. A (1205)
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.
HORIZONTAL SIDEWALL VENTING
For applications where vertical venting is not possible, the
only approved method of horizontal venting is the use of an
auxiliary power vent. Approved power venters are Fields
Controls Model SWG-4Y or Tjernlund Model GPAK-JT. Fol-
low all application and installation details provided by the
manufacturer of the power vent. This unit may be horizontally
vented using 4” (10.2 cm) diameter pipe with a minimum
length of 4.5 feet (1.37 m) and a maximum length of 34.5 feet
(10.82 m) with up to 4 elbows.
FILTER SIZES
Cabinet
Size
Side
(in)
Bottom
(in)
CFM
1200
1200
1600
1600
2000
2200
2000
A
B
B
C
C
C
D
16 x 25
16 x 25
14 x 25
16 x 25
16 x 25
20 x 25
20 x 25
20 x 25
22 x 25
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.
16 x 25
16 x 25
(2) 16 x 25
(2) 16 x 25
(2) 16 x 25
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.
FILTER PERFORMANCE - PRESSURE DROP INCHES W.C.
Minimum
Filter Type
Airflow
Opening Size
Disposable
Washable Fibers
1 Opening 2 Openings
inwc inwc
Pleated
Range
1 Opening
In³
2 Openings
In³
1 Opening
inwc
0.01
0.05
0.1
2 Openings
inwc
1 Opening
2 Openings
inwc
CFM
inwc
0.15
0.2
0 - 750
230
0.01
0.05
0.1
751 - 1000
1001 - 1250
1251 - 1500
1501 - 1750
1751 - 2000
2001 & Above
330
330
0.2
330
0.1
0.1
0.25
0.3
380
658
658
658
0.15
0.19
0.19
0.09
0.11
0.11
0.14
0.18
0.18
0.08
0.1
0.17
0.17
0.17
380
0.3
463
0.1
0.3
UNIT CLEARANCES TO COMBUSTIBLES (ALL DIMENSIONS IN INCHES, AND ALL SURFACES IDENTIFIED WITH THE
UNIT IN AN UPFLOW CONFIGURATION)
Left
Side
Right
Side
Floor/
Bottom
Line
Contact
Application
Top
Front
Rear
Flue
Closet
Alcove
Attic
Upflow
1
1
1
6
3
6
0
0
0
0
0
0
3
0
3
6
1
6
Combustible
Combustible
Combustible
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Upflow B-Vent
Horizontal
Yes1
Yes1
1
3
0
0
0
1
Combustible
No
Yes
Yes
Horizontal B-Vent
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.
6
Unitary Products Group
036-21618-003 Rev. A (1205)
For additional connection diagrams for all UPG equipment refer to “Low Voltage System Wiring” document available online at
Thermostat Chart
Unitary Products Group
7
APPLYING FILTER PRESSURE DROP TO
DETERMINE SYSTEM AIRFLOW
ACCESSORIES
PROPANE (LP) CONVERSION KIT -
1NP0347 - 040, 080,100 MBH
1NP0348 - 060, 115, 130 MBH
To determine the approximate airflow of the unit with a filter in
place, follow the steps below:
1. Select the filter type.
This accessory conversion kit may be used to convert natural
gas (N) units for propane (LP) operation. Conversions must
be made by qualified distributor or dealer personnel.
2. Select the number of return air openings or calculate the
return opening size in square inches to determine the
proper filter pressure drop.
SIDE RETURN FILTER -
1SR0302 - All Models
1SR0200 - All Models
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.
BOTTOM RETURN FILTER -
1BR0114 or 1BR0214 - For 14-1/2” cabinets
1BR0117 or 1BR0217 - For 17-1/2” cabinets
1BR0121 or 1BR0221 - For 21” cabinets
1BR0124 or 1BR0224 - For 24-1/2” cabinets
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 airflow corresponds to the intersection of the
ESP column and Model/Blower Speed row.
INTERNAL FILTER WITH FIBER FILTER -
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 pressure may be rounded to the nearest value
in the table determining the airflow using Step 5 or calcu-
late the airflow by using the following example.
1HF0801 - All Models
HIGH ALTITUDE PRESSURE SWITCHES -
For installation where the altitude is less than 8,000 feet it is
not required that the pressure switch be changed. For alti-
tudes above 8,000 feet see kits below. Conversion must be
made by qualified distributor or dealer personnel.
Example: For a 60,000 BTUH (17.58 kW) furnace with a bot-
tom return opening 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:
1PS0301 - 040, 060 MBH
1PS0302 - 080 MBH
1PS0311 - 100, 115, 130 MBH
Obtain the airflow values at 0.50 w.c. (125 Pa) & 0.60 w.c.
(150 Pa) ESP.
ROOM THERMOSTATS - A wide selection of compatible
thermosets are available to provide optimum performance
and features for any installation.
3
Airflow @ 0.50”: 1250 CFM (35.4 m /min)
3
Airflow @ 0.60”: 1180 CFM (33.4 m /min)
Subtract the airflow @ 0.50 w.c. (125 Pa) from the airflow @
0.60 w.c. (150 Pa) to obtain airflow difference.
1H/1C, manual change-over electronic non-programmable
thermostat.
3
1H/1C, auto/manual changeover, electronic programmable,
deluxe 7-day, thermostat.
1180 - 1250 = -70 CFM (-12 m /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
1H/1C, auto/manual changeover, electronic programmable.
* For the most current accessory information, refer to the
price book or consult factory.
table, 0.60 w.c.
percentage.
(150 Pa) - 0.50 w.c. (125 Pa), to obtain a
(0.58 - 0.50) / (0.60 - 0.50) = 0.8
Multiply percentage by airflow difference to obtain airflow
reduction.
(0.8) X (-70) = -56
Subtract airflow reduction value to airflow @ 0.50 w.c. (125
Pa) to obtain actual airflow @ 0.58 in. w.c. (144 Pa) ESP.
1250 - 56 = 1194
Subject to change without notice. Printed in U.S.A.
036-21618-003 Rev. A (1205)
Copyright © by Unitary Products Group 2005. All rights reserved.
Supersedes: 036-21618-002 Rev. A (1004)
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