INSTALLATION AND USER MANUAL
D SERIES ELECTRIC FURNACE
MODELS: 21D10, 21D15, 21D18, 21D20, 21D23, 21D25 AND 21D27
IMPORTANT
: READ AND SAVE THESE INSTRUCTIONS.
12575216KHUEURRNH4XHEHFZZZGHWWVRQFD
FB0004
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30042524B
C
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!
WARNING
• Never tamper with the unit or its controls. User MUST contact a
specialized contractor when a failure occurs. DO NOT ATTEMPT
to repair.
• When using a humidifier make sure not to damage the heating
element bank.
• We recommend that your unit be inspected by a specialized
technician once a year.
• Poor maintenance of air filters OR an unbalanced static pressure
may result in a performance decrease.
• Always use genuine parts for maintenance or service call. The
use of unbranded parts will void the warranty.
• The use of this unit without an air distribution duct will void the
warranty.
• It is strictly forbidden to use jumpers to simulate heat demand.
• Risk of electrical shock. Disconnect power before installation,
servicing, maintenance or field wiring. Replace all panels before
operating. Failure to do so can result in electrical shock causing
severe injuries or death.
• When performing installation, servicing or cleaning the unit, it is
recommended to wear safety glasses and gloves.
• To assure a proper performance of your furnace, we recommend
that you use high quality name brand thermostats.
• When applicable local regulation comprises more restrictive
installation and/or certification requirements, the aforementioned
requirements prevail on those of this document and the installer
agrees to conform to these at his own expenses.
• For your safety, do not store or use gasoline or other flammable
liquids and vapors in the vicinity of this unit or any other
appliance.
• These instructions are intended to be used by qualified personnel
who have been trained in installing this type of furnace. Installation
of this furnace by an unqualified person may lead to equipment
damage and/or hazardous condition which may lead to bodily
harm.
• This furnace is not watertight and is not designed for outdoor
installation. This furnace shall be installed in such a manner as to
protect its electrical components from water. Outdoor installation
leads to a hazardous electrical condition and to premature
furnace failure, thus voiding the warranty.
• Do not block the combustion air openings in the furnace. Any
blockage will result in improper overheat situation and may result
in a fire hazard and/or cause bodily harm.
• The unit must have an uninterrupted or unbroken electrical
ground to minimize personal injury if an electrical fault should
occur. When performing electrical connection, the ground
conductor must be firmly attached to the ground lug in the furnace.
• Do not use this furnace as a construction heater. Use of this
furnace as a constr uction heater exposes the fur nace to abnormal
conditions, contaminated combustion air and the lack of air filters.
Failure to follow this warning can lead to premature furnace failure
and/or vent failure which could result in a fire hazard and/or
bodily harm.
• The owner and/or the user is responsible of the following:
Always maintain the immediate surrounding of the furnace free
from combustible and highly flammables materials.The furnace
ambient air should not have an excessive dust concentration
and humidity. Never operate this central heating appliance without
an air filter.
• Before performing any service functions, unless operations
specifically require the power to be on, make sure all utilities are
turned “OFF” upstream of the appliance. Failure to comply with
this warning will cause a fire hazard and/or bodily harm.
• All questions regarding the operation, maintenance or warranty
of this unit should be addressed to the company where this
product has been sold from.
CAUTION
• Never burn garbage or paper in the heating system and never leave rags or paper around the unit.
• Return air grilles and warm air registers must not be obstructed.
IMPORTANT: All local and national code requirements governing the electrical installation heating equipment, wiring and flue connections
must be followed. Some of the codes that may be applicable are :
ANSI/NFPA 70 NATIONAL ELECTRICAL CODE
CSA C22.1 CANADIAN ELECTRICAL CODE
Only the latest issues of the above codes should be used, and are available from either:
The National Fire Protection Agency or The Canadian Standards Association
Batterymarch Park 178 Rexdale Blvd.
Quincy, MA 02269 Rexdale, Ontario M9W 1R3
- 2 -
TABLE OF CONTENTS
1. DIMENSIONS .............................................................................................................................................. 3
2. GENERAL REQUIREMENTS AND SPECIFICATIONS ............................................................................... 4
3. OPERATING OPTIONS ............................................................................................................................... 5
4. BREAKERS ................................................................................................................................................. 5
5. INSTALLATION NOTES ............................................................................................................................... 6
5.1 COLD AIR RETURN ....................................................................................................................................................... 6
5.2 ELECTRICAL WIRING - POWER SUPPLY ............................................................................................................................6
5.3 CONNECTING AND ADJUSTING THE LOW VOLTAGE THERMOSTAT ............................................................................................6
6. USE IN MOBILE HOMES ............................................................................................................................ 6
7. USING OPTIONAL EQUIPMENT ................................................................................................................. 7
7.1 TWO-STA GE OR OUTDOOR THERMOSTAT .......................................................................................................................... 7
7.2 AIR CONDITIONING .......................................................................................................................................................7
7.3 E
7.4 INTERLOCK CONNECTION ............................................................................................................................................... 7
8. WIRING DIAGRAMS ................................................................................................................................8-11
9. SERVICE PARTS ........................................................................................................................................12
LECTRONIC AIR CLEANERS AND/OR POWERED FURNACE HUMIDIFIERS .................................................................................7
10. MAINTENANCE ..........................................................................................................................................13
11. TROUBLESHOOTING ................................................................................................................................13
12. WARRANTY ................................................................................................................................................14
1. D IMENSIONS
TOP VIEW
1½”
(38 mm)
WIRING KO’S VALUES
8” (35 mm)
A = 1³/
B = 1¼” (32 mm) & 1¾” (44 mm)
C = 7/8” (22 mm) & 2” (51 mm)
18” x 18 ”
(457 mm x 457 mm)
1½” x 1½” KO
RETURN
1½” x 1½” KO
(38 mm x 38 mm)
WIRING KO’S
C
18” x 18 ”
(457 mm x 457 mm)
RETURN
FK0004A
20”
(508 mm)
39”
(991 mm)
17” x 17 ”
(432 mm x 432 mm)
DISCHARGE
1½”
(38 mm)
FRONT VIEW RIGHT SIDE VIEW REAR VIEW LEFT SIDE VIEW
20”
(508 mm)
1”
(25 mm)
FILTER FRAME
(EITHER SIDE, REAR
OR BOTTOM)
1½” x 1½” KO
(38 mm x 38 mm)
WIRING KO’S
A
B
C
18” x 18 ”
(457 mm x 457 mm)
RETURN
(38 mm x 38 mm)
- 3 -
2. GENERAL REQUIREMENTS AND SPECIFICATIONS
CAUTION
This unit must be installed in a dry place, in a non-corrosive, well-ventilated environment, without excessive dust. The
ambient temperatue must be over 10°C and under 27°C. If the ambient temperatue is 10°C or less, the plenum must be
insulated on 10 ft linear minimum length.
1. LOCATION - The furnace should be centrally located to the heating area.
2. POSITIONS - It can be installed for vertical, horizontal or downflow operation. When installed horizontally, the furnace should be positioned such as the
door will not end up being on the top. The door should be on the side of the furnace, to ensure that the motor bearings are in their designed position. In
vertical downflow installations, use only “L”- or “T”-shaped plenum with no openings or registers directly below furnace.
3. INSTALLATION CLEARANCES - As shipped from the factory, each unit is approved for “zero inch” clearance. If additional clearance is required, it will be
indicated on the data label attached to the furnace.
4. TEMPERATURE RISE - Furnaces are shipped to operate at 0.20” W.C. (50 Pa) external static pressure. They are certified for operation up to
0.50” W.C. (125 Pa). Check below for temperature rise table on specification chart and, if necessary, adjust the unit to match.
5. SERVICE CLEARANCE - Units are serviced from the FRONT. Leave at least 24” (610 mm) clearance in front of the door.
240 VOLTS - SINGLE PHASE TEMPERATURE RISE @ 0.20” W. C.
MODEL NO. KW BTHU AMPS INCL. MOTOR HP BLOWER
21D10 10 34152 46 1/3
21D15 15 51228 67 1/3 24 43 MED-LOW 814
21D18 18 61473 77 1/3 27 49 MED-LOW 814
21D20 20 68304 86 1/3 33 59 MED-LOW 814
10” x 8”
(254 mm x 203 mm)
21D23 22.5 76842 94 1/3 36 65 MED-LOW 814
21D25 25 85379 107 1/3 37 67 MED-LOW 814
21D27 27 92210 116 3/4
*FACTORY SETTINGS.
SUBJECT TO CHANGE WITHOUT NOTICE
12” x 8”
(304 mm x 203 mm
°C °F *SPEED RPM
23 41 LOW 663
36 65 MED-HIGH 707
10” x 8” (254 mm x 203 mm) BLOWER
SPEED
LOW
MED-LOW
MED-HIGH
HIGH
WARNING:
** These speeds can only be run with heater off, for cooling/ventilation purposes only.
FLOW
RATE
CFM
L/s
CFM
L/s
CFM
L/s
CFM
L/s
0.2 0.3 0.4 0.5 0.6
756
357
1035
488
1177
556
1301
614
STATIC PRESSURE
(INCHES OF WATER COLUMN)
749
353
1018
480
1157
546
1276
602
740
349
997
470
1132
534
1247
588
729
344
971
458
110 2
520
1207
569
337
935
441
1063
502
1145
540
SPEED
713
MED-LOW**
MED-HIGH
LOW**
HIGH
12” x 8” (304 mm x 203 mm) BLOWER
FLOW
RATE
CFM
L/s
CFM
L/s
CFM
L/s
CFM
L/s
0.2 0.3 0.4 0.5 0.6
727
343
912
431
1216
574
1640
774
STATIC PRESSURE
(INCHES OF WATER COLUMN)
699
330
897
423
1200
566
1601
755
667
315
878
414
1181
557
1558
735
636
300
853
402
1157
546
1513
714
606
286
823
388
1129
533
1466
692
- 4 -
3. OPERATING OPTIONS
The furnace is shipped from the factory in a “Standard Heating Mode” (all switches are in the Down position). When the thermostat calls for heat, the automatic
controls will be activated and the furnace turned “ON”.
The blower will run at low speed or higher speed (as selected by SPEED SELECTOR switch).
As the furnace heats up, it automatically switches to the pre-programmed heating speed when additional elements are activated by the electronic control, if
it was initially set to run at low speed. The timing of this blower speed change will depend on whether F
You may, however, change from the Standard Heating Mode by using the controls built into your furnace.
AST or SLOW is selected on the HEAT ACTIVATION switch.
SPEED SELECTOR
HIGH
LOW
The SPEED SELECTOR switch is used to control the fan speed (ventilation).
Even if there is no call for heat, the ventilation can be controlled by the
thermostat; the fan speed is determined by this switch.
LOW – The blower motor will operate at low speed.
HIGH – The blower motor will operate at a higher speed.
HEAT ACTIVATION
SLOW
FAST
During spring or fall, you may require less rapid response when the
thermostat calls for heat.
When S
LOW is selected, it takes more time to bring all the elements online.
When FAST is selected, the heating elements come online faster.
Slow (First Stage)
Slow Response Sequence
Element 1 - Heat on instantly Element 1 - Heat on instantly
Blower on after a 3-second delay Blower on after a 3-second delay
Elements 3 and 5
after a 1-minute delay
Element 2 after a 2-minute delay Element 2 after a 20-second delay
Element 4 and 6
after a 3-minute delay
NOTE: Elements 4, 5 and 6 only where applicable.
Fast (Second Stage)
Rapid Response Sequence
Elements 3 and 5
after a 10-second delay
Element 4 and 6
after a 30-second delay
4. BREAKERS
D Series furnaces are equipped with breakers, located on the front panel
of the unit. These devices protect the heating elements from overcurrent.
If this situation occurs, the breakers will open to cut the power from the
heating elements only.
NOTE: The number of breakers varies according to the furnace
model; 21D10 model has no breakers, 21D15, 21D18 and
21D20 models have 2 breakers and 21D23, 21D25 and 21D27
models have 3 breakers. Refer to Section 8 Wiring Diagrams.
BREAKERS
FD0003
!
WARNING
Breakers do not cut power to entire furnace, only to the heating elements. Do not use the breakers to turn off the furnace.
The power to the whole unit can only be cut from the main electrical panel.
- 5 -
5. INSTALLATION NOTES
5.1 COLD AIR RETURN
The duct can be attached to either side, rear or the bottom of the furnace.
For side return there are four 1½” (38 mm) knockouts which can be removed and used as an outline for cutting a 18” x 18” (457 mm x 457 mm)
return air opening in the furnace left or right side. Mount the filter frame to the furnace over the opening with the open side of the frame facing front.
Then attach the 19” x 19” (483 mm x 483 mm) air duct to the flanges on the filter frame.
For bottom mounting, remove the screws holding the bottom plate to the furnace, discard the bottom plate and attach the filter frame to the bottom
flanges with the open side of the frame facing front.
5.2 ELECTRICAL WIRING - POWER SUPPLY
The furnaces are completely factory wired. From a separate breaker, a two-wire plus ground supply wire is required. The ground conductor must be
firmly attached to the ground lug in the furnace and the supply wires to the terminal block in the furnace.
NOTE: When a FK120 kit is used to supply an air cleaner and/or humidifier, a third (neutral) conductor must be brought into the furnace.
!
WARNING
For all installations, we only recommend appropriate gauge good quality copper wire(s). However, it is the electrician’s
responsibility to ensure that the wiring and connections are compliant to the latest editions of the Canadian Electrical Code
and local codes.
5.3 CONNECTING AND ADJUSTING THE LOW VO LTAGE T HERMOSTAT (Use only class 1 wires inside furnace compartments.)
Attach thermostat wires to the low voltage terminal block located on the inside of the furnace. Follow the diagrams supplied with the thermostat. As a
general guide, remember that the R & W terminals control single stage heating; the R & Y terminals control cooling. Single stage cooling uses “Y/Y2”
as first and only stage.Two-stage cooling uses “Y1” as first stage and “Y/Y2” as second stage. Make sure the thermostat is levelled on the wall and in
appropriate location as per instructions supplied with the thermostat.
CAUTION
Before turning the furnace on, the heat anticipator in the thermostat must be properly set.
Because each installation is different an accurate reading of the current draw should be made with an AC meter. Set the meter at 2 A range for
furnaces through 20 kW, and at 4 A range for larger units.
A. Set the anticipator at its highest setting.
B. Disconnect the “W1” thermostat wire from the furnace low voltage terminal connections.
C. Connect the AC meter between the “W1” terminal on the board and the loose “W1” wire.
D. Turn the thermostat up to start the furnace and allow it to run,with all elements on, for three or four minutes.
E. Read the current draw on the meter and reset the anticipator to match the meter reading.
6. USE IN MOBILE HOMES
Models 21D10, 21D15, 21D18 and 21D20 are certified for “L”-shape
and “T”-shape shallow duct installation with model FSB-1 sub-base in
downflow applications when the supply air ducts pass through the floor
of the structure. Recommended size of a floor opening: 14¼” x 14¼”
(362 mm x 362 mm). The duct system must be designed so that the external
static pressure of the system does not exceed the maximum external static
pressure of 0.50” W.C. (125 Pa).
SHALLOW DUCT AREA REQUIREMENTS
DUCT DEPTH DUCT WIDTH
4” (102 mm) 16” (406 mm)
5” (127 mm) 13” (330 mm)
6” (152 mm) 10” (254 mm)
- 6 -
7. U SING OPTIONAL EQUIPMENT
R
7.1 TWO-STAGE OR OUTDOOR THERMOSTAT
(The HEAT ACTIVATION switch must be in the SLOW position).
Follow the directions supplied with the two-stage or outdoor thermostat in conjunction with the furnace wiring diagram.
7.2 AIR CONDITIONING
Your furnace is equipped with all the controls required for the addition
of air conditioning (except the heat-cool thermostat).
The evaporator coil may be installed by a local contractor in sheet
metal plenum of his own manufacture. The coil should be located:
centred over the “chimney” of the furnace 4” (102 mm) to 6” (152 mm)
above the top of the furnace.
Make sure no air is allowed to bypass the cooling coil during cooling
operation. If the discharge opening is a great deal larger than the
coil, and the ductwork is correspondingly larger than the coil, you
may want to use a bypass damper for heating. The damper would be
closed in summer, directing all air flow through the coil. In winter the
damper would be open to allow air to bypass the coil.
Typical air-conditioning field wiring connections are shown in the
diagram at right.
FURNACE
FE0002A
WIRING COLOR CODE
CGRW1W2 Y
COMMON GREEN RED WHITE
THERMOSTAT
WHITE (BLUE
OPTIONAL)
CONDENSE
YELLOW
7.3 ELECTRONIC AIR CLEANERS AND/OR POWERED FURNACE HUMIDIFIERS
These units operate at 120 V. Your 240 V furnace is designed so that Model FK120 adaptor kit can be mounted inside the furnace to supply the
required 120 V. Instructions for mounting and wiring are included with the kit.
7.4 INTERLOCK CONNECTION
When the electric furnace is used in combination with another device
(as for example, a wood burning furnace), it is recommended to perform
the connection by referring to the wiring diagram at right. The burning
furnace thermostat will then turn automatically on the blower in the
electric furnace.
External Request
for Fan Activation
Relay
COM
FE0034A
NC
NO
Furnace
Thermostat
R
G
Electric Furnace
Furnace
24 VAC
R
Power Output
Call for FAN
G
System
- 7 -
8. WIRING DIAGRAMS
!
WARNING
Risk of electric shock. Disconnect power before installation, servicing, maintenance or field wiring. Replace all panels
before operating. Failure to do so can result in electric shock causing severe injuries or death.
21D10 Model
E
R
R
R
R
G
BK
BK
ARTP
HEAT 2
E
ARTP
HEAT 1
L2
R
R
N
L1
BK
BK
21D15 Model
ARTP
ARTP
ARTP
R
BK
E
HEAT 3
E
HEAT 2
E
HEAT 1
G
BK
FE0065A
R
R
R
R
L2
R
R
N
L1
BK
C
BK
C
Open: 93.3°C
MRTP 1 MRTP 2
W
HEAT 2
KC2
NO
COM
BK
24V
W
DC
PK
BK
PK
HEAT 1
KC1
NO
BK
W
W
NC
COM
BK
24V
GR
DC
W
K7
1
3
24V
PK
DC
5
4
6
BL
2
O
BR
BR
BK (HI)
HI
BL (MED-HI)
MED-HI
M
MED-LO
Y (MED-LO)
LO
R (LO)
Heat Activation
HEAT INDICATOR
Speed Selector
LO
Y
MED-HI
TB
BK
R
R
Y
W
PK
GR
Power
Heat 2
Heat 1
1234567
PP
PP
GR
PP
BK
10 kW 240 VAC
Single phase
K2
K2
HEAT
COOL
O
BK
GND
Vout
Heat 3
Heat 4
BOARD POWER SUPPLY
BK
PP
GR
K1
VSPOWER
XFMR
L1
FAN
BK
P3
P2-8
P2-7
P2-6
P2-5
P2-4
P2-3
P2-2
P2-1
P2
L2 COM
W
B2
25 A
R
B1
50 A
50 A
25 A
R
BK
P
R
BK
Heat Activation
HEAT 3
KC3
NO
COM
24V
DC
HEAT 2
KC2
24V
DC
HEAT 1
KC1
24V
DC
COM
COM
BK
PK
BK
BR
BK
GR
BK
W
NO
BK
W
NO
BK
W
W
BR
GR
Power
Heat 1
1234567
BOARD POWER SUPPLY
PP
PP
PK
Heat 2
Heat 3
P3
Heat 4
BK
Vout
GR
BK
W
NC
O
BR
BR
W
K7
1
3
24V
PK
DC
5
4
2
6
Speed Selector
BL
Y
LO
MED-HI
R
Y
TB
BK (HI)
HI
BL (MED-HI)
MED-HI
M
MED-LO
Y (MED-LO)
LO
R (LO)
HEAT
INDICATOR
PP
BK
15 kW 240 VAC
Single phase
HEAT
O
COOL
BK
FAN
PP
GR
XFMR
BK
L1
VSPOWER
BK
W
Y
Y
24VAC
5 AMPS
24 VAC
COMMON OUT
FUSED 24 VAC
POWER OUT
GRC
CALL FOR FAN
Y/Y2
CALL FOR COOL
REVERSING VALVE
CALL FOR HEAT 1
CALL FOR HEAT 2
Y1W2W1O
CALL FOR COOL 1
P1
L2
L2 COM2
R
O
Class 2 Transformer
Pri: 240 V 60 Hz
Sec: 24 V 60 Hz 40 VA
R
BK
Open: 93.3°C
MRTP 1 MRTP 2
W
Y
Y
GND
24VAC
5 AMPS
24 VAC
GRC
Y/Y2
Y1W2W1O
P1
L2
L2 COM2
R
O
Class 2 Transformer
Pri: 240 V 60 Hz
Sec: 24 V 60 Hz 40 VA
COMMON OUT
FUSED 24 VAC
POWER OUT
CALL FOR FAN
CALL FOR COOL
REVERSING VALVE
CALL FOR HEAT 1
CALL FOR HEAT 2
CALL FOR COOL 1
BK
R
P2-8
P2-7
P2-6
P2-5
P2-4
P2-3
P2-2
P2-1
P2
L2 COM
W
Critical characteristic
1. If any of the original wire, as supplied, must
F1
T
Y
Y
F1
be replaced, use the same equivalent wire.
Wiring must comply with applicable codes,
ordinances and regulations.
2. Field wiring must comply with applicable
codes, ordinances and regulations. Use only
Class 1 wiring inside furnace compartments.
Line voltage wiring:
UL AWM 1015, 600V, 105°C, VW-1, 8 AWG;
UL AWM 1015/1230, 600V, 105°C, VW-1, 12 AWG;
CSA TEW 600V, 105°C, FT1, 8 AWG and 12 AWG.
Low voltage wiring:
same ratings as high voltage except 18 AWG.
FAN MOTOR SPEED
HI
MED-HIGH
MED-LOW
LOW
LEGEND
Capacitor
Heating Element
Heating Element Relay
Fan Relay
Auto-Reset Thermal Protector
Manual-Reset Thermal Protector
Fan Motor
Terminal Bloc k
Transformer Class 2
Heat
240 V Line Supply
Neutral
Low power
High power
High power 8 AWG
WIRING COLOR CODE
BK BLACK
BL BLUE
BR BROWN
GR GREY
O ORANGE
PK PINK
PP PURPLE
R RED
W WHITE
Y YELLOW
W
C
E
KC
K
ARTP
MRTP
M
TB
T
HEAT
L1, L2
N
F1 Fuse
B Breaker
COLOR
BLACK
BLUE
YELLOW
RED
For the use of a two-stage
thermostat or an outdoor
thermostat, connect between
W1 and W2. Make sure that the
T
Y
Y
Heat Activation switch is set to
“Slow” position.
- 8 -
8. WIRING DIAGRAMS (CONT’D)
!
WARNING
Risk of electric shock. Disconnect power before installation, servicing, maintenance or field wiring. Replace all panels
before operating. Failure to do so can result in electric shock causing severe injuries or death.
21D18 & 21D20 Models
R
ARTP
ARTP
R
ARTP
R
R
L2
ARTP
R
R
R
N
G
L1
BK
BK
BK
E
BK
HEAT 4
E
BK
HEAT 3
E
HEAT 2
E
HEAT 1
W
R
BR
C
BR
BK
BK
NC
Open: 93.3°C
MRTP 1 MRTP 2
W
HEAT 4
KC4
NO
W
NO
W
NO
W
NO
W
HEAT 3
KC3
HEAT 2
KC2
HEAT 1
KC1
3
4
6
COM
BK
24V
PP
DC
COM
BK
24V
DC
COM
BK
24V
BR
DC
COM
BK
24V
GR
DC
W
K7
1
24V
DC
PK
5
BL
2
Y
O
BK (HI)
HI
BL (MED-HI)
MED-HI
M
MED-LO
Y (MED-LO)
LO
PK
B2
50 A
50 A
PK
B1
50 A
R
50 A
BK
Speed Selector
LO
MED-HI
R
BK
Heat Activation
PK
GR
Power
1234567
PP
PP
GR
HEAT INDICATOR
PP
BK
R
18/20 kW 240 VAC
Single phase
Y
TB
PP
W
BR
Heat 3
Heat 4
Vout
Heat 2
Heat 1
P3
BOARD POWER SUPPLY
BK
PP
GR
HEAT
O
COOL
BK
FAN
XFMR
BK
L1
VSPOWER
BK
GND
P2-8
P2-7
P2-6
P2-5
P2-4
P2-3
P2-2
P2-1
P2
R (LO)
Y
L2
L2 COM
R
W
Y
F1
24VAC
5 AMPS
24 VAC
COMMON OUT
RC
FUSED 24 VAC
POWER OUT
CALL FOR FAN
Y/Y2G
CALL FOR COOL
O
REVERSING VALVE
CALL FOR HEAT 1
CALL FOR HEAT 2
Y1W2W1
CALL FOR COOL 1
P1
L2 COM2
O
Class 2 Transformer
Pri: 240 V 60 Hz
Sec: 24 V 60 Hz 40 VA
BK
R
W
T
Y
Y
FE0068A
Critical characteristic
1. If any of the original wire, as supplied, must
be replaced, use the same equivalent wire.
Wiring must comply with applicable codes,
ordinances and regulations.
2. Field wiring must comply with applicable
codes, ordinances and regulations. Use only
Class 1 wiring inside furnace compartments.
Line voltage wiring:
UL AWM 1015, 600V, 105°C, VW-1, 8 AWG;
UL AWM 1015/1230, 600V, 105°C, VW-1, 12 AWG;
CSA TEW 600V, 105°C, FT1, 8 AWG and 12 AWG.
Low voltage wiring:
same ratings as high voltage except 18 AWG.
Low power
High power
High power 8 AWG
For the use of a two-stage thermostat or an outdoor thermostat, connect between W1 and W2.
Make sure that the Heat Activation switch is set to “Slow” position.
C
Capacitor
E
Heating Element
KC
Heating Element Relay
K
Fan Relay
ARTP
Auto-Reset Thermal Protector
Manual-Reset Thermal Protector
MRTP
M
Fan Motor
TB
Terminal Bl ock
T
Transformer Class 2
HEAT
Heat
240 V Line Supply
L1, L2
N
Neutral
F1 Fuse
B Breaker
LEGEND
- 9 -
FAN MOTOR SPEED
HI
MED-HIGH
MED-LOW
LOW
BLACK
BLUE
YELLOW
RED
WIRING COLOR CODE
BK BLACK
BL BLUE
BR BROWN
GR GREY
O ORANGE
PK PINK
PP PURPLE
R RED
W WHITE
Y YELLOW
COLOR
8. WIRING DIAGRAMS (CONT’D)
!
WARNING
Risk of electric shock. Disconnect power before installation, servicing, maintenance or field wiring. Replace all panels
before operating. Failure to do so can result in electric shock causing severe injuries or death.
21D23 & 21D25 Models
R
ARTP
R
ARTP
ARTP
R
ARTP
R
R
L2
R
N
ARTP
R
R
R
R
G
L1
BK
BK
BK
BK
E
HEAT 5
E
HEAT 4
E
HEAT 3
E
HEAT 2
E
HEAT 1
BK
BK
BK
BK
BK
W
BR
C
BR
W
W
W
NC
O
W
B3
25 A
B2
B1
25 A
R
BK
PP
PP
R
BK
R
BK
R
W
50 A
R
BK
50 A
NO
NO
NO
HEAT 5
KC5
24V
DC
KC4
24V
DC
HEAT 3
KC3
COM
BK
HEAT 4
COM
COM
BK
24V
DC
HEAT 2
KC2
NO
W
NO
24V
DC
HEAT 1
KC1
COM
COM
BK
BR
PK
PK
50 A
R
50 A
BK
24V
GR
DC
W
K7
1
3
24V
DC
4
6
PK
5
BL
2
Y
Speed Selector
LO
MED-HI
Y
R
PK
PK
PP
PK
GR
PK
W
Heat Activation
GR
HEAT
INDICATOR
23/25 kW 240 VAC
TB
BK (HI)
HI
BL (MED-HI)
MED-HI
M
MED-LO
Y (MED-LO)
LO
R (LO)
RLY PWR2
HEAT5
HEAT6
HEAT5 IN
HEAT6 IN
24V
regulated
PP
BR
GR
Power
Heat 1
1234567
BOARD POWER SUPPLY
PP
PP
PP
BK
Single phase
HEAT
O
BK
Heater
Logic
PK
Heat 2
COOL
Heat 3
P3
FAN
MRTP 1 MRTP 2
W
GR
PK
GND
Vout
Heat 4
BK
P2-8
P2-7
P2-6
P2-5
PP
P2-4
P2-3
GR
P2-2
P2-1
P2
L1
L2 COM
VSPOWER
XFMR
BK
BK
Open: 93.3°C
W
Y
W
24VAC
5 AMPS
24 VAC
COMMON OUT
RC
FUSED 24 VAC
POWER OUT
CALL FOR FAN
Y/Y2G
CALL FOR COOL
O
REVERSING VALVE
CALL FOR HEAT 1
CALL FOR HEAT 2
Y1W2W1
CALL FOR COOL 1
P1
L2
L2 COM2
R
O
Class 2 Transformer
Pri: 240 V 60 Hz
Sec: 24 V 60 Hz 40 VA
BK
Y
F1
T
Y
Y
R
Critical characteristic
1. If any of the original wire, as supplied, must
be replaced, use the same equivalent wire.
Wiring must comply with applicable codes,
ordinances and regulations.
2. Field wiring must comply with applicable
codes, ordinances and regulations. Use only
Class 1 wiring inside furnace compartments.
Line voltage wiring:
UL AWM 1015/1230, 600V, 105°C, VW-1, 12 AWG;
CSA TEW 600V, 105°C, FT1, 12 AWG.
Low voltage wiring:
same ratings as high voltage except 18 AWG.
Low power
High power
High power 8 AWG
For the use of a two-stage thermostat or an outdoor thermostat, connect between W1 and W2.
FE0069A
Make sure that the Heat Activation switch is set to “Slow” position.
C
Capacitor
E
Heating Element
KC
Heating Element Relay
K
Fan Relay
ARTP
Auto-Reset Thermal Protector
MRTP
Manual-Reset Thermal Protector
M
Fan Motor
TB
Terminal Bl ock
T
Transformer Class 2
HEAT
Heat
L1, L2
240 V Line Supply
N
Neutral
F1 Fuse
B Breaker
- 10 -
LEGEND
FAN MOTOR SPEED
HI
MED-HIGH
MED-LOW
LOW
WIRING COLOR CODE
B BLACK
BL BLUE
BR BROWN
GR GREY
O ORANGE
P PINK
PP PURPLE
R RED
W WHITE
Y YELLOW
COLOR
BLACK
BLUE
YELLOW
RED
8. WIRING DIAGRAMS (CONT’D)
!
WARNING
Risk of electric shock. Disconnect power before installation, servicing, maintenance or field wiring. Replace all panels
before operating. Failure to do so can result in electric shock causing severe injuries or death.
21D27 Model
G
BK
FE0070A
HEAT 5
R
ARTP
ARTP
R
ARTP
R
ARTP
R
ARTP
R
ARTP
R
L2
R
R
R
R
N
E
BK
HEAT 5
E
BK
HEAT 6
E
BK
HEAT 4
E
BK
HEAT 3
E
BK
HEAT 2
E
BK
HEAT 1
W
R
KC5
NO COM
HEAT 6
KC6
NO
KC4
NO
W
HEAT 3
KC3
NO
W
HEAT 2
KC2
NO
W
HEAT 1
KC1
NO
W
3
4
NC
6
W
BK
24V
DC
24V
DC
24V
DC
COM
BK
HEAT 4
COM
BK
COM
W
W
BK
24V
DC
PK
COM
BK
24V
BR
DC
COM
BK
24V
GR
DC
W
K7
1
24V
PK
DC
5
BL
2
BL
O
L1
BK
BK
BK
Critical characteristic
1. If any of the original wire, as supplied, must
be replaced, use the same equivalent wire.
Wiring must comply with applicable codes,
ordinances and regulations.
2. Field wiring must comply with applicable
codes, ordinances and regulations. Use only
Class 1 wiring inside furnace compartments.
Line voltage wiring:
UL AWM 1015, 600V, 105°C, VW-1, 8 AWG;
UL AWM 1015/1230, 600V, 105°C, VW-1, 12 AWG;
CSA TEW 600V, 105°C, FT1, 8 AWG, 12 AWG.
Low voltage wiring:
same ratings as high voltage except 18 AWG.
Low power
High power
High power 8 AWG
C
BR
M
BR
O
MED-HI
MED-LO
HI
LO
BK (HI)
BL (MED-HI)
Y (MED-LO)
R (LO)
C
E
KC
K
ARTP
MRTP
M
TB
T
HEAT
L1, L2
N
F1 Fuse
B Breaker
B3
25 A
R
R
25 A
BK
B2
50 A
PP
PP
PP
R
50 A
BK
PK
B1
50 A
R
50 A
BK
Speed Selector
LO
R
MED-LO
Y
TB
LEGEND
Capacitor
Heating Element
Heating Element Relay
Fan Relay
Auto-Reset Thermal Protector
Manual-Reset Thermal Protector
Fan Motor
Terminal Bloc k
Transformer Class 2
Heat
240 V Line Supply
Neutral
W
PK
PP
PK
PP
PK
GR
Heat Activation
GR
HEAT
INDICATOR
RLY PWR2
HEAT5
HEAT6
HEAT5 IN
HEAT6 IN
24V
regulated
PP
PK
BR
GR
W
Power
Heat 1
1234567
BOARD POWER SUPPLY
PP
PP
PP
BK
27 kW 240 VAC
Single phase
HEAT
O
FAN MOTOR SPEED
HI
MED-HIGH
MED-LOW
LOW
Heater
Logic
GR
PK
PK
Heat 3
Heat 4
Vout
Heat 2
P3
BK
PP
GR
COOL
FAN
VSPOWER
XFMR
BK
BK
WIRING COLOR CODE
B BLACK
BL BLUE
BR BROWN
GR GREY
O ORANGE
P PINK
PP PURPLE
R RED
W WHITE
Y YELLOW
Open: 93.3°C
MRTP 1 MRTP 2
W
W
GND
P2-8
P2-7
P2-6
P2-5
P2-4
P2-3
P2-2
P2-1
P2
L1
L2
L2 COM
BK
R
COLOR
BLACK
BLUE
YELLOW
RED
W
Y
F1
24VAC
5 AMPS
C
24 VAC
COMMON OUT
R
FUSED 24 VAC
POWER OUT
G
CALL FOR FAN
CALL FOR COOL
OY/Y2
REVERSING VALVE
W1
CALL FOR HEAT 1
W2
CALL FOR HEAT 2
Y1
CALL FOR COOL 1
P1
L2 COM2
O
Class 2 Transformer
Pri: 240 V 60 Hz
Sec: 24 V 60 Hz 40 VA
BK
R
Y
T
Y
Y
For the use of a two-stage thermostat or an outdoor thermostat, connect between W1 and W2.
Make sure that the Heat Activation switch is set to “Slow” position.
- 11 -
22
9. SERVICE PARTS
10
12
18
19
111315
14
16
17
KEY NO.
PART NO.
DESCRIPTION
1
30270032
Automatic Limit
2
30274132
Relay (KC1, KC2, KC3, KC4, KC5
and KC6)
3
30280021
Thermostat Indicator Light
4
30030006
Heat Activation Switch
5
30030025
Speed Selection Switch
6
30280020
Manual Reset Limit
7
30274200
Breaker 50 Amps
8
30274199
Breaker 25 Amps
9
30010010
Fiberglass Filter 20” x 20” x 1”
(508 mm x 508 mm x 25 mm)
10
10941149
Service Blower Assembly for 21D10,
21D15, 21D18, 21D20, 21D23 and 21D25
11
10941221
Service Blower Assembly for 21D27
12
624663
Electronic Control
KEY NO.
PART NO.
DESCRIPTION
13
30274131
Relay (K7)
14
30300022
Transformer 240 V
15
30270038
Motor Capacitor for 21D10, 21D15,
21D18, 21D20, 21D23 and 21D25
16
30271114
Motor Capacitor for 21D27
17
30390553
Blower Wheel 12” x 8” (305 mm x 203 mm)
for 21D27
18
10941203
Motor 1/3 HP for 21D10, 21D15, 21D18,
21D20, 21D23 and 21D25
19
10941288
Motor 3/4 HP V for 21D27
20
10940080
Element Assembly 5000 W, 240 V
21
10940081
Element Assembly 4500 W, 240 V
22
30390119
Blower Housing & Wheel DD10
*
10941364
Service wiring kit ‘’D’’
*
624664
Daughterboard (21D23, 21D25 and
21D27 only)
*
10941440
Service Door D Series
10-20KW
10941441
23-27KW
*
FK120
120 Volt Kit (optional, purchase separately)
9
87
65
4
3
2
120
21
FL0024
REPLACEMENT PARTS
* Not illustrated
EPLACEMENT PARTS AND REPAIRS
R
IN ORDER TO ENSURE YOUR UNIT REMAINS IN GOOD WORKING CONDITION, YOU MUST USE NORTRON GENUINE REPLACEMENT PARTS ONLY. THE NORTRON GENUINE REPLACEMENT PARTS ARE
SPECIALLY DESIGNED FOR EACH UNIT AND ARE MANUFACTURED TO COMPLY WITH ALL THE APPLICABLE CERTIFICATION STANDARDS AND MAINTAIN A HIGH STANDARD OF SAFETY
PARTY REPLACEMENT PART USED MAY CAUSE SERIOUS DAMAGE AND DRASTICALLY REDUCE THE PERFORMANCE LEVEL OF YOUR UNIT
NORTRON RECOMMENDS TO CONTACT A CERTIFIED SERVICE DEPOT FOR ALL REPLACEMENT PARTS AND REPAIRS.
REPLACEMENT PARTS
. ANY THIRD
, WHICH WILL RESULT IN PREMATURE FAILING. ALSO,
-12-
10. MAINTENANCE
MOTOR: The motor is lubricated for life and needs no oiling.
FILTERS: Size is 20” x 20” x 1” (508 mm x 508 mm x 25 mm). Should be inspected and replaced when dirty.
Ordinarily replacement is required twice per heating season and, perhaps, a third time if continuous blower operation is used.
NOTE: Each element has an automatic reset thermal cut-out which is set to open at 160°F (71°C). If it opens, the element will be de-energized until the
cut-out resets itself. In addition to that, there are 2 manual reset thermal cut-outs that open at 200°F (93°C). If any of them open, a front panel
needs to be removed so the cut-out can be manually reset.
!
WARNING
Cut 240 V power supply before removing the front panel!
11. T ROUBLESHOOTING
The first step in identifying an operational problem is to determine whether
the fault is in the furnace or in the thermostat and/or its connecting wiring.
To help make this determination, the furnace is equipped with a “Thermostat
ON” diagnostic light. If the light is “ON”, it indicates the thermostat has
closed and is calling for heat; the blower should be operating. If the light is
“OFF”, the furnace should not be operating.
1. If the furnace will not start:
Turn the thermostat to its highest setting. If the light goes on, the thermostat
has closed, so the fault is in the furnace. If the light does not go on, the
thermostat or its connecting wiring is the problem.
2. If the furnace will not turn off:
Turn the thermostat to its lowest setting. If the light goes off and the
furnace continues to run, the thermostat has opened properly and the
problem resides in the furnace. If the light stays on, the fault is in the
thermostat or its connecting wiring.
After the fault area is isolated by use of the diagnostic light, a check of
the following components can be made more efficiently.
PROBLEM POSSIBLE DEFECTIVE PA RT S OR COMPONENTS
1. The furnace will not turn on. • Thermostat
2. Motor runs continuously. • Thermostat wires incorrectly attached to the furnace
3. Elements on, but motor does not run. • Motor or capacitor
4. Motor going on and off in short cycles
(or in too long cycles)
5. The thermostat must be set much higher (or lower)
than the desired house temperature
6. Not enough heat • One or more defective elements or relays
7. Two-stage or outdoor thermostat not operating properly • HEAT ACTIVATION switch not set in L
8. Thermal cut-out opens • Airflow is reduced because of blocked ductwork or very dirty filters
9. Breaker on front panel trips • Overcurrent on heating element. Reset the breaker.
• Circuit breaker or fuse is open
• Motor or capacitor
• SPEED SELECTOR switch (open contact)
• Electronic control
• Transformer
• SPEED SELECTOR switch (open contact)
• Electronic control
• Heat anticipator in thermostat incorrectly set or may be defective
• The thermostat is not leveled or out of calibration
• HEAT ACTIVATION switch set in L
• Safety limits opening because duct obstruction or dirty filters are restricting air flow
• Defective or incorrect wired two-stage or outdoor thermostat
• Lack of enough cold air returns in house
If problem persists, call an electrician
OW position
OW position
- 13 -
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