Installation Instructions
Electric Central Furnace - Blower & Relay
For Models E(1,2)E(H,B) Series
The p/n 902986 2-wire and p/n 902987 A/C Heat Pump (4 to 7 wire) Relay Boxes install with current
models of the E1 and E2 NORDYNE electric furnaces. The 2-wire Relay Box has control switches that
are operable through an opening in the furnace door.
Important Information
Read all instructions carefully before starting the installation. Specifications or designs are subject to
change or to discontinuance without notice and without incurring obligations.
Improper installation may damage
equipment, can create a hazard, and will
void the warranty.
Shut off electrical supply to the furnace
at the household breaker box to prevent
electrical shock which could cause
personal injury.
WARNING:
DANGER:
These instructions are primarily intended to assist qualified individuals experienced in the proper installation of heating and/or air
conditioning appliances. Some local codes require licensed installation/service personnel for this type of equipment. Read all instructions
carefully before starting the installation.
!
!
2
Table of Contents
Page
Installation ..................................................................................................................................................................... 3
Blower Selection ............................................................................................................................................................ 3
Blower Speed Selection ................................................................................................................................................ 3
System Operation .......................................................................................................................................................... 4
Replacement Parts ........................................................................................................................................................ 5
System Wiring ............................................................................................................................................................... 6
Circuit Board Schematics .............................................................................................................................................. 7
Figure 2. E2E(-) Series Electric Furnace
Furnace Door
Low Voltage Wiring
Circuit Breakers
Relay Box
Wiring Harness plugs
here on Furnace
Control Panel
Blower
and
Relay
Wiring Harness
Door Control
Frame (Used
with 2-wire
relay box)
Connect 8-Pin
Connector on
Wiring
Harness here
Connect Blower
Connector here
Blower Connector
(connect to relay
box)
Connect to Furnace
Control Panel
Connect to
Relay Box
Wiring Harness
Blower
and
Relay
Door Control Frame
(Used with 2-wire
relay box)
Furnace
Door
Low Voltage Wiring
Relay Box
Wiring Harness plugs
here on Furnace
Control Panel
Decorative Door
Insert
Wiring Harness
Circuit Breakers
Connect to
Relay Box
Connect to
Furnace
Control Panel
Blower
Connector
(connect to
relay box)
Connect
8-Pin
Connector
on Wiring
Harness
here
Connect
Blower
Connector
here
Wiring Harness
Figure 1. E1E(-) Series Electric Furnace
Name Plate Insert
3
Installation Sequence for Models
E(1,2) E(H,B) Series Electric Furnace (See
Figures 1 or 2)
Prior to installing a relay box in the NORDYNE furnace,
be sure to install the correct A/C system equipment as
outlined on the furnace options label.
1. Remove the furnace door by pulling outward either
from the top or the top side of the door. Switch the
circuit breaker(s) to the OFF position. (See Figure
1 or 2 for the circuit breaker location.)
Before installing the relay box remove the blower
and install the cabinet insulation kit for furnaces
that are not factory equipped with this package.
Refer to the instructions supplied with the kit for
proper installation.
2. E(1,2)EH Models: All E(1,2)EH models require a
relay box when adding an air conditioner or heat
pump.
E(1,2)EB Models: E(1,2)EB models using a 2-wire
thermostat require a relay box (2-wire) when adding
an air conditioner.
Blower Selection: See the furnace Installation
Instructions for the correct air conditioning or heat
pump available with the factory installed furnace
blower. Change out the blower when needed.
3. Remove the cover from the relay box by removing
the screw from each side.
Blower Speed Selection:
• HEATING - Move the orange wire on the circuit
board to one of the four quick-connects labeled with
heating blower speeds.
• COOLING - Move the violet wire on the circuit
board to one of the three quick-connects labeled
with cooling blower speeds.
• TWO SPEED BLOWER - Connect the orange wire
(heating) to the L (low) quick-connect for low speed.
Connect the violet wire (cooling) to the ML (medium
low) quick-connect for high speed.
• FOUR SPEED BLOWER - See Table 1 for the
appropriate speed connections for the E1E(-) and
Table 2 for the E2E(-).
Reattach the relay box cover using the two screws
previously removed.
IMPORTANT:
For the 2-wire relay box (only after the cover has been
reattached):
a. Attach two red caps (provided in plastic bag) to the
switches that stick through the bezel on the sheet
metal cover (see Figure 3, items 7 and 8).
Air Conditioning
Model No.
Air Conditioning/Heat Pump Operation (violet wire)
-024 -030, -036
-042, -046,
048
Heat Pump Model
-018 -024, -030
-036,
-042,-048
Furnace
Model No.
-010, -012,
Relay Box
Speed Terminal
(minimum)
-015, -017, -020, -023
Furnace Operation (orange wire)
ML MH H
Relay Box
Speed Terminal
NOTE: See furnace installation instructions for nominal
air deliveries.
Table 1. E1E(-) Heating and Cooling Speed Setting Positions -4 Speed Blower
Table 2. E2E(-) Heating and Cooling Speed Setting Positions -4 Speed Blower
Air Conditioning/Heat Pump Operation (violet wire)
SEE FURNACE BLOWER LABEL FOR
APPROPRIATE SPEED CONNECTIONS
Furnace Operation (orange wire)
NOTE: See furnace installation instructions for nominal
air deliveries.
LML
Furnace
Model No.
-010, -012, -015
Relay Box
Speed Terminal
(minimum)
-017, -020, -023
LML
4
For E2E(-) furnace only:
b. Attach the appropriate brand label to the sheet
metal cover so that it may be seen through the door
control frame (see Figure 2) in the furnace door
when it is replaced.
c. Attach the foam “standoff” to the bottom corner on
the back side of the relay box opposite the side
where the bracket is attached (See Figure 2A). This
standoff will prevent movement of the relay box
when the homeowner adjusts the switches.
4. Relay Box Attachment (See Figures 1 or 2):
Attach the mounting bracket to the appropriate side
of the relay box. Attach the relay box to the side of
the blower housing.
Insert the relay/blower assembly into the furnace
by sliding it into the furnace and under the mounting
tabs. Secure the blower in place by using the
blower screws previously removed.
5. Relay Box Connection (See Figure 1or 2):
• Unplug the blower connector and the thermostat
pigtail leads connector from the furnace control
panel.
• Plug the two different 6-circuit connectors on the
relay box wiring harness into their corresponding
locations on the furnace control panel (where the
blower and thermostat leads connectors were just
removed).
• Plug the 8-circuit connector on the other end of the
wiring harness into the side of the relay box.
• Plug the 6-circuit blower connector into the bottom
of the relay box.
6. Low Voltage Wiring (See Figure 1or 2): Bring in
the low voltage field wires from the thermostat and
air conditioning or heat pump unit and attach them
to the screw terminals located at the top of the relay
box. See Figure 5 for System Wiring.
7. Switch the circuit breaker(s) to the ON position.
The unit is now ready for operation.
System Operation —
For the AC/Heat Pump Relay Box
Heating: Set the furnace system switch to AUTO, the
thermostat system switch to HEAT, and the thermostat fan
switch to AUTO.
Cooling: Set the furnace system switch to AUTO, the
thermostat system switch to COOL, and the thermostat fan
switch to AUTO.
Emergency Heat: (Used with a heat pump only.) Set the
furnace system switch to AUTO, the thermostat system
switch to EMERGENCY HEAT, and the thermostat fan
switch to AUTO.
Continuous Air Circulation: Set the thermostat fan switch
to ON.
Shut off System: Set the thermostat system switch to OFF
and set it to the lowest temperature setting. Set the furnace
system switch to OFF and shut off all power to the air
conditioner.
For the 2-Wire Relay Box
Heating: Set the furnace system switch to AUTO, the
temperature switch (on the relay box) to HEAT, and the fan
switch (on the relay box) to AUTO.
Cooling: Set the furnace system switch to AUTO, the
temperature switch (on the relay box) to COOL, and the fan
switch (on the relay box) to AUTO.
Continuous Air Circulation: Set the fan switch (on the
relay box) to ON.
Shut off System: Set the temperature switch (on the relay
box) to OFF and set the thermostat to the lowest temperature
setting. Set the furnace system switch to OFF and shut off
all power to the air conditioner.
Attach foam “standoff” here.
Figure 2A. E2E(-) Electric Furnace with
2-wire Relay Box
5
Figure 3. 2-Wire Relay Box Exploded View
Figure 4. A/C Heat Pump Relay Box Exploded View
Model p/n 902986
Blower & Relay Replacement Parts List
Model p/n 902987
2
6
5
4
1
8
7
3
1
4
2
3
5
6
ITEM # PART # DESCRIPTION 902986 902987 ITEM # PART # DESCRIPTION 902986 902987
1 375950 Cover (2 Wire) 1 4 259200 Wire Harness 1 1
375951 Cover (AC/HP) 1 5 376050 Mounting Bracket, E1 1 1
2 375960 Box, Relay 1 1 6 380790 Mounting Bracket, E2 1 1
3 624567 2 Wire Relay Circuit Board 1 7 669084 Bezel 1
(includes items 6 & 7) 8 632278 Switch Cap 2
624568 AC/HP Relay Circuit Board 1
6
Figure 5. System Wiring
Blower
Motor
L
ML
MH
H
C
123456
123456
R Y W G
A/C O.D. Section
4 Wire A/C
T- Stat
8765
4
3
21
8765
43
21
Blower
Motor
R C Y O W
2
W/E G
123456
12345
6
LOW
MED-LO
MED-HI
HIGH
240V L1
240V L2
Furnace
control panel
SEQ 1 (W2)
24V COM
24V HOT
SEQ 2 (W2)
12345
6
12345
6
G
OPEN
L
ML
MH
H
C
Furnace With the AC/Heat Pump
Relay Box and a 4 Wire Thermostat
123456
123456
RC RH Y W G
A/C O.D. Section 5 Wire A/C
T- Stat
8765
4
3 21
Blower
Motor
R C Y O W 2
W/E G
123456
123456
LOW
MED-LO
MED-HI
HIGH
240V L1
240V L2
Furnace
control panel
SEQ 1 (W2)
24V COM
24V HOT
SEQ 2 (W2)
123456
123456
G
OPEN
L
ML
MH
H
C
Furnace With the AC/Heat Pump
Relay Box and a 5 Wire Thermostat
123456
123456
R W
A/C O.D. Section
2 Wire Heat
Only T-Stat
8765
43
21
8765
43
21
Y R C W
123456
123456
LOW
MED-LO
MED-HI
HIGH
240V L1
240V L2
Furnace
control panel
SEQ 1 (W2)
24V COM
24V HOT
SEQ 2 (W2)
123456
123456
G
OPEN
Furnace With the 2 Wire Relay
Box and a 2 Wire Thermostat
HEAT
COOL
OFF
ON
AUTO
FAN
123456
123456
H/P O.D. Section
H/P
T- Stat
Blower
Motor
R C Y O W2 W/E G
123456
123456
LOW
MED-LO
MED-HI
HIGH
240V L1
240V L2
Furnace
control panel
SEQ 1 (W2)
24V COM
24V HOT
SEQ 2 (W2)
123456
123456
G
OPEN
L
ML
MH
H
C
Furnace With the AC/Heat Pump
Relay Box and a Heat Pump
R C Y O E W2
R C Y O W2 E G
123456
123456
Powermiser
Compressor Section
Blower
Motor
R C Y O W2 W/E G
123456
123456
LOW
MED-LO
MED-HI
HIGH
240V L1
240V L2
Furnace
control panel
SEQ 1 (W2)
24V COM
24V HOT
SEQ 2 (W2)
123456
123456
G
OPEN
L
ML
MH
H
C
Furnace With the AC/Heat Pump Relay Box and a Powermiser
C W2 G R G Y W2 O P R
Powermiser
T- Stat
C W1 G Y E F O P R X
Fan Coil T-Stat
ODT
LEGEND
Field Wiring
Factory Wiring
Wire Harness Supplied with Relay Box
Wire Harness Supplied
with Relay Box
Wire Harness Supplied
with Relay Box
Wire Harness Supplied
with Relay Box
Wire Harness Supplied with Relay Box
NOTE: a jumper
wire must connect
the two R terminals
on the thermostat.
Optional
Heat Pump
Interconnect
Cable
8765
4
321
8765
4
321
8765
4
321
8765
4
321
8765
4
321
7
P1
H MH ML L
COOL
HEAT
K1
K2
P2
K3
K3
K4
COOL
OFF
HEAT
AUTO
FAN ON
K1
Cooling Speed
Selector (violet wire)
Heating Speed
Selector
(orange wire)
K2
K4
Blower
Switch
Temperature
Switch
2 Wire Circuit Board (used in relay box 9029
8
AC/Heat Pump Circuit Board (used in relay box 9029
8
P2
K1
K2
P1
H MH ML L
COOL
HEAT
K1
K2
Cooling Speed
Selector (violet wire)
Heating Speed
Selector
(orange wire)
6 5 4 3 2 1
6 5 4 3 2 1
6
5
4
3
2
1
7
8
6
5
4
3
2
1
7
8
Y
R
C W
R C Y O W2 W/E G
Figure 6. Wiring Schematics
O’Fallon, MO
7088010 (Replaces 707545A)
Specifications and illustrations subject to change without
notice and without incurring obligations. Printed in U.S.A.
(08/07)
¢708801¨¤
7088010
/
