Unitary products group EB SERIES Installation Manual
Some of the info we offer in our downloads can be quite old. It’s rare that prices
for parts are listed in manuals, but if you see any please ignore them as the
prices are probably obsolete.
Most manuals contain parts lists and diagrams. The older the unit, the more
you’ll find obsolete parts. In same cases the parts may still be available, but
under a new part number. In other cases a generic part may be suitable for use.
For help in finding parts, please visit our parts store at
www.HVACpartstore.com.
Please note that specifications and illustrations are subject to change without notice and without
incurring obligations.
The information contained in this download is for the use of qualified individuals who have been
trained to interpret this data. All repairs on HVAC equipment should be performed by a qualified
technician. In some states, counties or cities, the law states that repairs must only be done by
licensed individuals. Persons not legally or technically qualified should not attempt to interpret
this information or perform any repairs
.
INSTALLATION
DOWNFLOW/UPFLOW
ELECTRIC FURNACE
MANUAL
TABLE OF CONTENTS
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . 2
EB FURNACE NOTES . . . . . . . . . . . . . . . . . . . . . . . 2
CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
FURNACE CLEARANCE . . . . . . . . . . . . . . . . . . . . . 2
RETURN AIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
DUCT SYSTEM DESIGN . . . . . . . . . . . . . . . . . . . . . 3
DOWNFLOW FURNACE INSTALLATION
(WITH 7900 SERIES DUCT CONNECTOR) . . . . . . 3
DUCT CONNECTORS (7990 SERIES) . . . . . . . . . . 4
INSTALLATION OF SCREW ATTACHMENT DUCT
CONNECTOR (7990 SERIES) . . . . . . . . . . . . . . . . . 5
INSTALLATION OF TAB ATTACHMENT DUCT
CONNECTOR (7990 SERIES) . . . . . . . . . . . . . . . . . 5
INSTALLATION OF THE FURNACE . . . . . . . . . . . . 6
FURNACE CONVERSION TO UPFLOW
APPLICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
MODELS: EB SERIES
THERMOSTAT INSTALLATION . . . . . . . . . . . . . . 9
OPTIONAL AIR CONDITIONING
ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . 10
HIGH PERFORMANCE BLOWER ACCESSORY
PACKAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . 11
REPAIR PARTS LIST . . . . . . . . . . . . . . . . . . . . . 17
CAUTION: READ ALL SAFETY GUIDES
BEFORE YOU START T O INST ALL
YOUR UNIT.
SAVE THIS MANUAL
Incorrect installation may create condition
where the operation of the product could
cause personal injury or property damage.
The furnace shall be installed so the electrical components are protected from water.
This product must be installed in strict
compliance with the enclosed installation
instructions and any applicable Local, State
and National Codes including, but not limited to building, electrical, and mechanical
codes. Improper installation will void the
warranty.
66669
035-15266-003 Rev. A (0804)
035-15266-003 Rev. A (0804)
GENERAL INFORMATION
EB FURNACE NOTES
The following list includes important facts and information
regarding the EB furnace and its packaging inclusions:
1. Furnace is rated at 240 volts, 60 Hz, single phase.
2. Heating and Cooling thermostat is packed with furnace.
3. Filters are furnished with each model.
4. Filter size is universal to all models - 16 x 20 x 1.
1-7/8
19-5/8
SUB-BASE, IF USED,
THERMOSTAT
WIRING
ENTRY
FIELD
WIRING
ENTRY
J
H
A
B
C
ADDS 7/8” MORE TO
TOTAL HEIGHT AND
3/8” TO WIDTH.
M
L
K
E
F
G
D
51-5/8
N
OPTIONAL BOTTOM FIELD
WIRING ENTRY
FIGURE 1 : FURNACE DIMENSIONS
5. Furnace size is the same for all models. See Figure 1.
6. Four-wire thermostat operation for heating and cooling.
7. Coil cavity built into furnace.
8. All furnaces are equipped with an air conditioner blower
and is A/C or Heat Pump ready.
9. Holding strap furnished on top rear of furnace.
10. This furnace is designed for downflow application; however, it may be converted to an upflow application. (See
Page 6 for upflow conversion instruction.)
11. This furnace must not be operated without the front
panel installed.
NOTE: This furnace and its components listed on the A/C
and Heat Pump equipment sticker were listed in
combination as a system by Underwriter's Laboratories for the United States and Canada.
A
B
C
D
E
F
G
H
J
K
L
M
N
2-5/8
3-1/2
1
5-1/16
5-1/2
5-13/16
1
1-3/4
7-13-16
8-5/8
9-7/16
16-1/2
CODES
The electric furnace must be installed in accordance with the
following codes:
• Standard for the Installation of Air Conditioning and Ventilating Systems (NFPA 90A)
• Standard for the Installation of W arm Air Heating and Air
Conditioning Systems (NFPA 90B)
• National Electric Code (NFPA 70)
• Canadian Electrical Code, Part I (CSA C22.1)
• All local codes (state/county/township).
NOTE: All applicable codes take precedence over any rec-
ommendation made in these instructions.
LOCATION
Access for servicing is an important factor in the location of
any furnace. Provide a minimum of 24 inches in front of the
furnace for access to the heating elements and controls. This
access may be provided by a closet door or by locating the
furnace 24 inches from a facing wall or partition.
FURNACE CLEARANCE
Electric furnace is approved for zero (0) in. clearance to combustible material on all or any part of the furnace exterior and
the inlet or outlet duct work. Clearances must be provided
above the furnace for a minimum of 200 sq. inches free opening for return air. For clearances other than shown above see
paragraph on Return Air.
RETURN AIR
In order for the furnace to work properly, a closet or alcove
must have a certain total free area opening for return air.
FOR HEATING ONLY FURNACE
Minimum 200 in2 free area opening.
Use Return Grille 7900-287P/B,
Or any Return Grille with minimum 200 in2 free area opening.
FOR A/C UP TO 4-TONS AND HP UP TO 3 1/2-TONS
Minimum 250 in
Use Return Grille 7900-287P/B, 1FG0620BK (hinged),
Or Louvered Door 3500-1581, 3500-5851 (bulk pack),
Or any Return Grille with minimum 250 in
FOR A/C UP TO 5-TONS AND HP UP TO 4-TONS
Minimum 330 in
Use Return Grille 1RF1025BK, 1FG0125 (hinged),
Or Louvered Door 3500-1591, 3500-5861 (bulk pack),
Or any Return Grille with minimum 330 in
The return air opening can be located in a closet front door or
a sidewall above the furnace casing, or in a louvered door on
the furnace. If opening for the return air is located in the floor,
side walls or closet door anywhere below furnace casing
height, 6 inches minimum clearance must be provided on the
furnace side where return is located to provide for proper air
flow. See Figure 2. The 6 “ minimum clearance is not required
if there is a return grille installed above the furn ace height.
This return grille cannot start more than three feet above the
furnace height.
2
free area opening.
2
free area opening.
2
free area opening.
2
free area opening.
2 Unitary Products Group
There must be at least
2 ft. of space available
in front of furnace for
23” MIN.
20”
24” MIN.
20”
servicing the furnace
when necessary.
A 6 in. clearance is
required if the space
between furnace and
enclosure is used for
return air.
FIGURE 2 : ALCOVE & CLOSET CLEARANCES
For Upflow installations, a closet 32 inches wide by 30 inches
deep with a 30-inch wide door is necessary. See Figure 3.
When installing furnace in a separate closet or room which is
accessible only through an outside door, a minimum of 200
sq. in. free opening for return air must be provided. The supply and return air must be ducted, securel y attached and be
sealed to the furnace casing if there are grilles in the outside
door to the closet. Openings where ducts pass through walls,
the floor or the ceiling must be sealed to prevent air leakage
into or from closet and the living area.
32”
1-5/8” MIN., 2-3/8 MAX.
30”
RETURN AIR
PASS THROUGH
FRAME WIDTH
30”
WIDE DOOR
25-1/2””
CLOSET
FIGURE 3 : UPFLOW CLOSET CLEARANCE
Provisions shall be made to permit the return of circulating air
from all rooms and living spaces, except the bathroom(s) to
the circulating air supply inlet of the furnace. Fai lure to comply may cause improper heating and may cause the furnace
to cycle on the limit.
035-15266-003 Rev. A (0804)
DUCT SYSTEM DESIGN
Electric furnace is designed to operate at a given static pressure.
In order to assure proper air flow through the furnace, the distribution system must be designed so that the static pressure
external to the furnace does not exceed the static pressure
rating shown on the furnace rating plate. See Table 3.
The number, size and placement of registers should be such
that even distribution of heat is provided throughout the
home.
DOWNFLOW FURNACE INSTALLATION
(WITH 7900 SERIES DUCT CONNECTOR)
We have redesigned our duct connector to eliminate the subbase requirement. Table 1 will help you in deciding the part
number of the new duct connector you need.
If you are installing a new duct connector (7900 Series), refer
to the following instructions. Read carefully the instructions
provided before starting the installation.
Provide adequate clearance for servicing.
1. Locate furnace conveniently away from wall facing or
partitions to permit easy removal of components.
2. A minimum of six (6) inches should be maintained
between the furnace and closet door when door is used
for return air. See Figure 2.
3. Two (2) feet of space must be available in front of furnace for future servicing (blower or element removal, furnace removal, etc.).
Table 1: DUCT CONNECTOR FOR ELECTRIC
FURNACES
FLOOR TO
DUCT DIMENSIONS
1” 7990-6211 7990-6011
2” 7990-6221 7990-6021
3”
4” 7990-6241 7990-6041
5”
6” 7990-6261 7990-6061
7” 7990-6271 7990-6071
8” 7990-6281 7990-6081
9”
10” 7990-6301 7990-6101
11”
12” 7990-6321 7990-6121
13”
14” NA NA
15” NA NA
↑↓ - Indicates connector above or below could be used
depending on tolerance in floor to duct dimension.
↑↑ - Indicates connector above could be used depending
on tolerance in floor to duct dimension.
↓↓ - Indicates connector below could be used depending
on tolerance in floor to duct dimension.
FINGERED
STYLE
↑↓ ↑↓
↑↓ ↑↓
↑↓ ↑↓
↑↓ ↑↓
↑↑ ↑↑
SCREW
TAB STYLE
Unitary Products Group 3
035-15266-003 Rev. A (0804)
13
11
18
14
3
4
2
3
8
2
3
8
2
3
8
2
3
8
SEE
CHART
12
18
3
4
2
3
8
2
3
8
3
8
4
DUCT
CUTOUT
DIMENSIONS
DUCT CONNECTORS FOR
TAB ATTACHMENT
DUCT CONNECTORS (7990 SERIES)
These duct connectors are for connecting the furnace to an under the floor supply duct system.
The furnace may be installed on combustible flooring without a separate sub-base.
DUCT CONNECTORS FOR
SCREW ATTACHMENT
3
18
3
3
2
2
8
8
14
3
3
2
2
8
8
3
3
2
2
8
8
13
12
11
3
4
8
4
18
SEE
CHART
3
4
FIGURE 4 :
9-7/8
23-1/4
20-1/2
2-1/8
1-3/8
1
FUTURE REFRIGERANT
LINE ENTRANCE
DUCT CONNECTOR DIMENSIONS (7990 SERIES)
REAR WALL
OF ENCLOSURE
MIN.
2-3/4
15
6-3/8
9-3/4
15
3-1/4
20
CEILING CUT-OUT
FOR ROOF JACK
FLOOR CUT-OUT
FOR DUCT
CONNECTOR
FURNACE
OUTLINE
OPTIONAL
ELECTRIC
ENTRANCE
1-1/8
FLOOR
FIGURE 5 : RECOMMENDED FLOOR CUT-OUT (7990
SERIES)
=
FLOOR
DUCT CONNECTOR
DEPTH
SUPPLY DUCT
FIGURE 6 : DUCT CONNECTOR DEPTH
(7990 SERIES)
FLOOR
JOIST
4 Unitary Products Group
035-15266-003 Rev. A (0804)
LOCATOR BRACKET
NAILS, FLAT HEAD SCREWS
OR STAPLES
SCREWS
FLOOR
SUPPLY DUCT
FIGURE 7 : DUCT CONNECTOR SCREW
ATTACHMENT (7990 SERIES)
INSTALLATION OF SCREW ATTACHMENT DUCT
CONNECTOR (7990 SERIES)
1. Make floor cut out as shown in Figure 5.
2. Determine the depth of the floor cavity from the surface
of the floor to the top of the supply air duct and select the
appropriate duct connector from the chart.
3. Place locating bracket (supplied with the duct connector)
to the back edge of the floor opening. See Figure 7.
4. Apply a water based duct sealant to the 1/2" supply duct
attachment flange of the duct connector.
5. Determine which of the four positions the duct connector
best centers over the supply duct and insert it through
the floor cutout.
6. When properly aligned with the supply duct, secure the
duct connector to the floor with nails, flat head screws or
staples.
7. Use screws as required to secure the duct connector to
the supply duct.
8. Cut out the opening to the supply duct. If sealant was not
used, the installer should tape the mating flanges to provide a good air seal.
NOTE: Duct sealant and tape must be classified as meeting
HUD Standard 3280.715, U.L. Standard 181A. Tape
used to provide a better air seal should be approved
by the applicable National or Local Code.
LOCATOR BRACKET
NAILS, FLAT HEAD SCREWS
OR STAPLES
BEND TABS UNDER
DUCT OPENING TO
SECURE TO THE
SUPPLY DUCT.
FLOOR
SUPPLY DUCT
FIGURE 8 : DUCT CONNECTOR TAB
ATTACHMENT (7990 SERIES)
INSTALLATION OF TAB ATTACHMENT DUCT
CONNECTOR (7990 SERIES)
1. Make floor cut out as shown in Figure 5.
2. Determine the depth of the floor cavity from the surface
of the floor to the top of the supply air duct and select the
appropriate duct connector from the chart.
3. Place locating bracket (supplied with the duct connector)
to the rear of the floor area for the furnace. See Figure 8.
4. Determine which of the four positions the duct connector
best centers over the supply duct and insert it through
the floor cutout.
5. Mark cut-out location on the supply duct and remove the
duct connector.
6. Cut out the opening to the supply duct.
7. Bend tabs down through and back up under the supply
duct.
8. Secure the duct connector to the floor with nails, flat
head screws or staples.
The duct connector is designed for use on ducts down to 12"
in width. When using the connector on smaller width ducts,
there will not be sufficient clearance to bend the tabs on two
sides of the duct connector.
In such cases the tabs may be attached to the sides of the
duct by using sheet metal screws or other suitable fasteners.
Holes for sheet metal screws are provided in three (3) tabs on
each side of the duct connector. If more than 3 tabs need to
be used to provide a more secure and air tight connection,
the remaining tabs can also be fastened to the duct with
screws after drilling the required screw holes.
Unitary Products Group 5
035-15266-003 Rev. A (0804)
FURNACE SEATED
AGAINST THE
LOCATOR BRACKET
SECURE FURNACE
TO FLOOR WITH
TWO NAILS OR
SCREWS
PARALLEL DUCT SYSTEM
The EB Duct Connector Insert 37323716001 may be used on
EB Series Electric Manufactured Housing Furnaces where
the duct system runs parallel to the furnace. See Figure 9.
The EB Duct Connector Insert should not be used if the duct
system runs perpendicular to the furnace or if the duct system extends only one direction from the furnace.
The Duct Connector Insert cannot be used with 1” and 2”
Duct Connectors (7990-6011, 7990-6021, 7990-6211, and
7990-6221).
Follow Accessory Kit Installation Instruction 035-20632-001
provided with the Duct Connector Insert.
FURNACE DOOR
FURNACE DOOR
PERPENDICULAR LAYOUT
PARALLEL LAYOUT
FIGURE 9 : DUCT SYSTEM CONFIGURATION
FURNACE CONVERSION TO UPFLOW
APPLICATION
Upflow furnace conversion is easily accomplished by following the steps listed below:
Provide adequate clearance for servicing:
1. Before Conversion, locate the furnace conveniently
away from wall facing or partitions to permit easy
removal and installation of components.
2. Two (2) feet of space must be available in front of furnace for future servicing (blower or element removal, furnace removal, etc.).
3500-5451* Adapter Box and/or 3500-7211* Upflow Flange
Plate Kit are needed prior to following steps below:
1. Assemble the 3500-5451 filter box per installation provided with kit.
2. Remove furnace panel.
3. Remove air filter.
4. Remove strap on the top of the unit, saving the screw
and strap for later use.
5. Turn entire unit upside-down, so the filter box is on the
floor.
6. Remove two (2) screws that are on the front of the unit at
the top. Obtain front panel hanger angle from the upflow
kit 3500-7211*. Secure the hanger angle with two (2)
screws removed from the furance casing See Figure 11.
FIGURE 10 : INSTALLATION OF FURNACE
INSTALLATION OF THE FURNACE
1. Remove the front panels and set the furnace onto the
duct connector. Slide it back until the rear of the unit
engages the locator bracket.
2. Secure the front of the furnace with two screws at the
mounting holes provided. See Figure 10.
3. Secure the top of the furnace to a structural member
using screw through the strap at the top of the furnace.
Strap may be moved to any of the holes located along
the top back of the furnace. Installer may provide an
equivalent method, such as screws through the casing
side.
HANGER ANGLE
SCREW x 2
CASING
FIGURE 11 : HANGER ANGLE ATTACHMENT
7. Attach the strap that was removed in Step 4 to the top,
side or back of the furnace.
8. Install the duct flange plate on top of the inverted furnace
as shown in Figure 12.
9. If installaing POS, Standard or Deluxe Air Systems, proceed to Step 10.
Optional start collar for the Economy POS system
shipped with 3500-7211* can be used for blend air flex
duct installation. Punch the lineset knockout out and
position the start collar over it. Duct connector edge can
be pushed under the casing flange and screws provided
can be used to capture the other end of duct co nn e c to r.
Secure collar to top of furnace.
6 Unitary Products Group
035-15266-003 Rev. A (0804)
10. Flange plate shipped with 35 00-7211* is mounted to the
furnace with eight (8) screws provided. Two (2) blunt
screws are for the holes in the front of the furnace. See
Figure 12.
1 1. If upflow adapter box kit 3500-5451* is not used, then
our optional filter bracket is provided with 3500-7211* kit.
This filter bracket maybe used to retain filter inside its
original location in the furnace.
12. Secure the top of the furnace to a structural member
using screws and the strap on top of the furnace. The
mobile home manufacturer may provide an equivalent
strap, if required, to secure the furnace.
13. If excessive movement is expected, then some blower
support is recommended.
USE BLUNT
SCREWS HERE
FLANGE
PLATE
(MOUNTED WITH
SCREWS)
DUCT
CONNECTOR
LINESET
KNOCKOUT
EB SERIES
(UPFLOW
FURNACE)
WIRING
Furnace wiring is complete except for the power supply and
the thermostat wires. See wiring diagram (or Table 2) for wire
and fuse size. See Table 2 for ground wire sizes. Thermostat
wires connect through side of furnace and should also be no
smaller than 22 gauge. Power wires can enter through the
side of the unit or through the auxiliary entrance, located in
the bottom of the unit. (See Figure 1). When bringing wiring
through the bottom of the furnace, cable connectors must be
installed to hold wiring in place and to relieve any strain on
the wiring. These connectors will also serve as a seal
between the furnace and the floor. Thus, additional sealing is
not required.
(Refer to the National Electrical Code, Canadian Electrical
Code and local codes for wiring material requirements.
NOTE: The furnaces are equipped with either one or two 60
amp circuit breakers. These circuit breakers protect
the wiring inside of the furnace in the event of a
short circuit. Additionally, these breakers provide a
means of disconnecting the power to the unit. The
circuit breakers in the furnace are not meant to protect the branch circuit wiring between the furnace
and the home's breaker panel. General wire and
breaker sizes are shown in Table 2. If sheathed
cable is used, refer to National Electrical Code,
Canadian Electrical Code and local codes for additional requirements concerning supply circuit wiring.
Electrical Data can be found in Table 4.
IMPORTANT - All installation on field wiring must be
rated at 60ºC or higher. Please refer to the wiring diagrams
on the furnace or this book for more information.
FIGURE 12 : BLOWER BRACKET AND DUCT FLANGE
AT TACHMENT
Table 2:
MODELS EB23B EB20B EB17B EB15B EB12B EB10B
Single Branch Circuit Service * 2 Leads + 1 Ground CKT#1
Nominal Circuit Load - AMPS 94.0 84.0 70.7 64.1 50.7 44.0
Minimum Wire Size (90º) #2 #3 #4 #4 #6 #8
Minimum Wire Size (75º) #1 #2 #3 #4 #6 #6
Minimum Wire Size (60º) #0 #1 #2 #3 #4 #6
Ground Wire Size + #6 #6 #8 #8 #8 #10
Max. Fuse (or C.B.) - AMPS 125 110 90 90 70 60
Dual Branch Circuit Service CKT #1 CKT #2 CKT #1 CKT #2 CKT #1 CKT #2 CKT #1 CKT #2
Branch Circuit Load - AMPS 47.3 46.7 44.0 40.0 47.3 23.4 44.0 20.1
Branch Circuit Min. - AMPS 59.2 58.4 55.0 50.0 59.2 29.3 55.0 25.2
Minimum Wire Size (90º) #6 #6 #8 #8 #6 #10 #8 #10
Minimum Wire Size (75º) #6 #6 #6 #8 #6 #10 #6 #10
Minimum Wire Size (60º) #4 #4 #6 #6 #4 #10 #6 #10
Ground Wire Size + #10 #10 #10 #10 #10 #10 #10 #10
Max. Fuse (or C.B.) - AMPS 60 60 60 50 60 30 60 30
* Requires Jumper Bars (P/N 3500-3781*) - Dual Supply for U.S. Only.
Refer to National Electrical Code. Table 310-16 for Non-Sheathed Conductors.
+ Refer to National Electrical Code. Table 250-95 for Non-Sheathed Conductor Ground Wire.
NOT
APPROVED
Unitary Products Group 7
035-15266-003 Rev. A (0804)
Table 3: EB SERIES BLOWER PERFORMANCE
Low Speed
Heating Speed
Models EB10, 12, 15
Medium Speed
Heating Speed
Models EB17, 20, 23
Medium High
with A-Coil in place
High
with A-Coil in place
Static Pressure
(Inches of WC)
CFM (STD. Air) 945 936 936 924 915 889 870 813 705
Static Pressure
(Inches of WC)
CFM (STD. Air) 1160 1145 1145 1140 1129 1109 1073 1027 935
Static Pressure
(Inches of WC)
CFM (STD. Air) 1340 1317 1290 1252 1208 1158 1095 1021 876
Static Pressure
(Inches of WC)
CFM (STD. Air) 1573 1534 1490 1435 1369 1309 1237 1135 1019
Table 4: ELECTRICAL DATA
MODEL NUMBER EB23B EB20B EB17B EB15B EB12B EB10B
D.O.E.
Output
OUTPUT
CAPACITY
Element Capacity
@ 240 VAC
Motor AMPS @ 240 V. 4.0 Maximum
Circuit Load AMPS
@ 240 V.
240 VAC
60 Hz.
1 Phase
230 VAC
60 Hz.
1 Phase
220 VAC
60 Hz.
1 Phase
.0 .1 .2 .3 .4 .5 .6 .7 .8
.0 .1 .2 .3 .4 .5 .6 .7 .8
.0 .1 .2 .3 .4 .5 .6 .7 .8
.0 .1 .2 .3 .4 .5 .6 .7 .8
BTU 77,000 67,000 56,000 51,000 39,000 34,000
KW 22.6 19.6 16.4 15.0 11.4 10.0
BTU 71,000 61,000 52,000 47,000 36,000 31,000
KW 20.8 17.9 15.2 13.8 10.6 9.1
BTU 65,000 57,000 48,000 43,000 33,000 29,000
KW 19.1 16.7 14.1 12.6 9.7 8.5
KW 21.6 19.2 16.0 14.4 11.2 9.6
AMPS90.080.066.760.046.740.0
CKT 1 47.3 44.0 47.3 44.0 50.7*
44.0
1
CKT 246.740.023.420.0
1.
Approved for Single Branch Circuit Service Only
Casing or Cabinet must be Permanently Grounded in Accordance with National Electrical Code or other Applicable Codes.
Models for EB23B, EB20B, EB17B and EB15B may be connected to a single or dual branch circuit. (See Table 2.)
These units are shipped from the factory set up for dual
tions, jumper bars (P/N 3500-378P*) are required and are
available from the factory. Model for EB12B is factory s hipped
with jumper bars in place.
power supply connections. For single power supply connec-
8 Unitary Products Group
035-15266-003 Rev. A (0804)
CIRCUIT
BREAKERS
ELECTRIC
PANEL
FIELD WIRING
PROTECTIVE
SHIELD
BLOWER
SEQUENCERS
BLOWER
RELAY
TRANSFORMER
LIMIT
SWITCHES
FIGURE 13 : CONTROL BOX
For personal safety be sure to turn the electrical
power “OFF" at the household service box and at
the furnace circuit breakers before attempting any
service or maintenance operations. Homeowners
should never perform any maintenance which
requires opening electric box door.
Furnace is equipped with a protective shield over
field wiring connection. When field wiring is completed, shield must be replaced to prevent hazard of
electrical shock when using furnace disconnect.
(See Figure 14.)
CIRCUIT BREAKERS
THERMOSTAT
WIRES
3500-378P* JUMPER
BARS (FOR SINGLE
BRANCH CIRCUIT
SERVICE)
NOTE:
AS SHIPPED, THE JUMPER BAR
ASSEMBLY IS SET-UP FOR
BOTTOM ENTRY. FOR SIDE
ENTRY, THE TOP LUG CAN BE
REMOVED AND RE-POSITIONED,
AS SHOWN, TO PROVIDE
PROPER WIRE BENDING
CLEARANCES.
GROUND
LUGS
THERMOSTAT INSTALLATION
The adjustable heat anticipator in the thermostat is pre-set at
0.4 Amps. This setting should be checked at the time of
installation
In some cases the thermostat may be a “self-setting" type in
which case no Amp. setting will be found on the thermostat,
eliminating the need for any field adjustment.
Thermostat should be located on an inside wall in an open
area to more closely regulate average room air, preferably,
where there is air movement back to furnace. Care should be
used to locate thermostat away from hot air discharge openings, lights, etc. Locating height of thermostat is important.
Thermostat should be located 52 to 66 inches above the
floor. This is sometimes called the comfort zone.
If a condenser with its own Transformer shares a Heat/Cool
Thermostat with this furnace, use a thermostat with isolating
contacts to prevent interconnection of Class II 24 Volt Systems.
Cycle furnace to make sure it will operate correctly.
Maintenance and operating instructions are in the customer
envelope accompanying the furnace.
Give the customer envelope to the home owner.
FIGURE 14 : FIELD WIRING SHIELD
Unitary Products Group 9
035-15266-003 Rev. A (0804)
When using separate thermostats, a thermostat
interlock system must be provided to prevent simultaneous operation of the furnace and air conditioner.
Simultaneous operation can result in coach overheating, equipment damage and energy waste. (See
Figures 15 and 16.)
Do not connect Yellow wire to thermostat until an
outdoor unit is installed.
The EB*B* Furnaces are A/C ready.
All furnaces installations should include a minimum of four conductor thermostat
wiring to accommodate future air conditioning installations.
THERMOSTAT WIRING SCHEMATIC FOR: BLEND AIR AND FURNACE
RED
WHITE
GREEN
RED
WHITE
GREEN
BLACK
COOLING
THERMOSTAT
DOUBLE POLE
DOUBLE THROW SWITCH
TO
AIR CONDITIONER
FIGURE 15 : THERMOSTAT WIRING
BLEND AIR
DELUXE
FRESH
AIR
II
OFF
ALARM
AUTO
HEATING
THERMOSTAT
TO
FURNACE
YELLOW
NOT FACTORY
INSTALLED
BLACK
BLACK
RED
WHITE
GREEN
WIRES FROM FURNACE
FIGURE 16 : THERMOSTAT WIRING
OPTIONAL AIR CONDITIONING
ACCESSORIES
Failure to install this insulation and coil shelf kit
could result in damage to equipment and/or personal injury. Liability and warranty from the manufacturer could also be void.
STANDARD OR DELUXE
BLEND AIR CONTROL BOX
Four-conductor wire is required for thermostat connection.
Attach the 4 low voltage wires extending from the control box as follows:
RED RED
1. wire from Furnace to thermostat wire.
WHITE WHITE
2. wire from Furnace to thermostat wire.
GREEN GREEN
3. wire from Furnace to thermostat wire.
BLACK
4. wire from Furnace to condensing unit contactor.
5. Thermostat wire to condensing unit contactor.
YELLOW
This furnace is already equipped with a blo wer and control
system to add-on air conditioning up to 4 tons and heat pump
up to 3-1/2 tons. Insulation and coil shelf kit (3500-8941* for
downflow or 3500-8961* for upflow) must be installed when
adding on such remote air conditioning systems.
10 Unitary Products Group
035-15266-003 Rev. A (0804)
HIGH PERFORMANCE BLOWER ACCESSORY
PACKAGE
All areas around the line sets, drain hoses and other
openings in the coil shelf should be sealed air tight.
Use some moldable compound or caulking to seal
the area. Failure to do so may result in loss of performance and premature compressor failure.
WIRING DIAGRAMS
CAPACITOR
*
BRN
MOTOR
ORG
.
.
.
.
BLK-COOLING SP
YEL-MED. LOW SP
BLU-MED. HIGH SP
RED-HEATING SP
4-SPEED BLOWER
EB SERIES FURNACES
ORG-COMMON.
All EB furnaces are already equipped with a blower and control system to add-on air conditioning up to 4-tons and heat
pump up to 3 1/2-tons. If the requirement is to achieve more
than specified than the production blower inside the furnace
would have to be replaced with an accessory blower package
3500-7901*. This accessory blower package would deliver air
conditioning up to 5-tons, and heat pump up to 4-tons. Accessory package (3500-7901*) includes blower, insulation, coil
shelf, trap, clamps, etc. Please refer to the installation instructions packed with the accessory package for more information.
BLEND AIR
CONTROL BOX
HEAT/COOL
GRN
WHT
RED
BLK
COND. UNIT
CONTACTOR
T’STAT
RH
G
W
Y
2 SPADE (INSUL.) TERMINALS
USED WHEN CHANGING SPEEDS
NOTE:
WIRING MUST CONFORM TO LOCAL CODES
APPROVED FOR CU CONDUCTORS ONLY.
BLOWER
RELAY
2
5
1
YEL
IF ANY OF THE ORIGINAL WIRE SUPPLIED
WITH THIS UNIT MUST BE REPLACED. IT
MUST BE REPLACED WITH TYPE 105°C
THERMOPLASTIC OR ITS EQUIVALENT.
FACTORY WIRING SHOWN SOLID. FIELD
WIRING SHOWN BROKEN.
4
6
3
BLU
TRANSFORMER
BLK
BLK
H2H1M3
M4M1M2
YEL
ELEMENTS
YEL
L
L
LINE
LOAD
GRN
YEL
YEL
YEL
SEQUENCER
LIMIT
SWITCHES
WHT
FUSE
RED RED
3A
BLK
ORG
ORG
R
R
CIRCUIT #1
BREAKER
ORG
SINGLE BRANCH
CIRCUIT SERVICE
60 AMP
GND.
LUG
D.O.E. OUTPUT CAPACITY - BTU
MAX. MOTOR-FLA
SINGLE BRANCH
CIRCUIT SERVICE
NOMINAL CIRCUIT LOAD-AMPS
WIRE SIZE (75° C) COPPER
WIRE SIZE (60° C) COPPER
MAX. FUSE SIZE (OR CB) - AMPS
240 VAC.
60 Hz
1 PHASE
MODEL: EB10B
240 VAC - 60 Hz - 1 PHASE
34,000
2 LEADS + 1 GROUND
44.0
4.0
#6
#6
60
FIGURE 17 : EB10B WIRING DIAGRAM
Unitary Products Group 11
Loading...