ELECTRIC UNIT
HEATERS
Installation Form RGM 411 (Version D)
Obsoletes Form 411 (Version C)
APPLIES TO:
Models AEUH and EUH
INDEX
(by page number)
Clearance to Combustibles ...................................... 6
Installation Codes .................................................... 1
Dimensions .............................................................. 3
Electrical .................................................................. 8
Fan Control .............................................................. 5
Fuses ........................................................................ 8
General .................................................................... 1
Hazard Intensity Levels ............................................ 1
Unit Heater Location ............................................... 4
Maintenance ........................................................... 15
Fan Motor ................................................................ 8
Field-Installed Option Kits ...................................... 4
Shipping Damage ..................................................... 4
WARNING: Improper installation, adjustment, alteration, service or maintenance can
cause property damage, injury, or death. Read
the installation instructions thoroughly before
installing this equipment.
1. General
The instructions in this manual apply to installation and operation of
Reznor Model AEUH and Model EUH electric unit heaters. These electric unit heaters meet UL requirements for electric air heaters and are
UL listed. Read all of these instructions before beginning installation.
Specifications are subject to change without notice.
HAZARD INTENSITY LEVELS
1. Danger: Failure to comply will result in severe personal injury,
death, and/or property damage.
2. Warning: Failure to comply could result in severe personal injury, death, and/or property damage.
3. Caution: Failure to comply could result in minor personal injury and/or property damage.
2. Installation Codes
Reznor Model Series AEUH and EUH Electric Unit heaters should be
installed by a qualified service person in accordance with the standards
of the National Board of Fire Underwriters for electric unit heaters.
Consult local authorities having jurisdiction to verify local codes and
Sizing of Equipment ................................................ 2
Specification Data .................................................... 2
Suspension ............................................................... 6
Fan Time Delay Switch (Option) ............................. 5
High Temperature Limit Switch .............................. 8
Manual Summer Fan Switch .................................... 6
Internal Thermostats (Option) ................................. 4
Thermostat ............................................................... 8
Uncrating ................................................................. 4
Vertical Louvers (Option AX3) - Model EUH only 4
Warranty .................................................................. 2
Wiring Diagrams - AEUH ..................................... 8-9
Wiring Diagrams - EUH .................................... 10-15
FOR YOUR SAFETY
The use and storage of gasoline or other
flammable vapors and liquids in open containers
in the vicinity of this appliance is hazardous.
installation procedures. Follow carefully both the national standards
and the local codes.
Specific Installations -- Installation in aircraft hangars should be in
accordance with ANSI/NFPA No. 409 (latest edition), Standard on
Aircraft Hangars. Installations in public garages should be in accordance with ANSI/NFPA No. 88A (latest edition), Standard for Parking
Garages. ANSI/NFPA No. 88A (latest edition) specifies heaters must
be installed at least eight feet above the floor.
Aircraft Hangars -- ANSI/NFPA No. 409 specifies a clearance of ten
feet to the bottom of the heater from the highest surface of the top of
the wings or engine enclosures of whatever aircraft would be the highest to be housed in the hangar. Maintain a minimum clearance of eight
feet from the floor in other sections of aircraft hangars such as offices
and shop which communicate with areas used for servicing or storage.
The heaters must be located so as to be protected from damage by
aircraft or other objects such as cranes and movable scaffolding. In
addition, the heater must be located so as to be accessible for servicing,
adjustment, etc.
All Installations -- Clearances from the heater to combustible construction or material in storage must conform with ANSI/NFPA standards, and such material must not attain a temperature over 160oF by
continued operation of the heater.
Form 411 (Version D), Mfg P/N 142272, Page 1
3. Sizing of Equipment
To determine total required kilowatt heating capacity of electric unit
heaters, calculate room heat losses by following methods and reference data from the ASHRAE Guide and DATA Book or the NEMA
formula for residential or office type applications.
It is important not to oversize equipment heating capacity, otherwise temperature control will be poor and both initial installation
and operating costs will be increased.
4. Specification Data
Model
(KW/BTU)
Model
Size
Pow er
Supply
60 Hz‚
240-1 Ph
240-3 Ph
480-3 Ph
240-1 Ph
240-3 Ph
480-3 Ph
240-1 Ph
240-3 Ph
480-3 Ph
240-1 Ph
240-3 Ph
480-3 Ph
240-3 Ph
480-3 Ph
240-1 Ph
240-3 Ph
480-3 Ph
240-3 Ph
480-3 Ph
240-3 Ph
480-3 Ph
240-3 Ph
480-3 Ph
240-3 Ph
AEUH
3-1-24
(3.0 KW/
3-3-24
10,240 BTU)
3-3-48
AEUH
5-1-24
(5.0 KW/
5-3-24
17,065 BTU)
5-3-48
AEUH
7-1-24
(7.0 KW/
7-3-24
23,890 BTU)
7-3-48
AEUH
10-1-24
(10.0 KW/
10-3-24
34,130 BTU)
10-3-48
AEUH
12-3-24
(12.0/40,950) 12-3-48
EUH
15-1-24-A
(15.0/51,195) 15-3-24-A
15-3-48-A
EUH
20-3-24-A
(20.0/68,260) 20-3-48-A
EUH
25-3-24-A
(25.0/85,325) 25-3-48-A
EUH
30-3-24-A
(30.0/102,390 30-3-48-A
35-3-24-A
EUH
(35.0/119,455 35-3-48-A 480-3 Ph
EUH
(40.0/136,520
EUH
(50.0/170,650
EUH
(60.0/204,780
40-3-24-A
40-3-48-A
50-3-24-A
50-3-48-A
60-3-24-A
60-3-48-A
240-3 Ph
480-3 Ph
240-3 Ph
480-3 Ph
240-3 Ph
480-3 Ph
Heating
Elem ents
Qty
KW
3
1.00
3
1.00
3
1.00
3
1.60
3
1.60
3
1.60
3
2.33
3
2.33
3
2.33
6
1.60
6
1.60
6
1.60
6
2.00
6
2.00
3
5.00
3
5.00
3
5.00
3
6.60
3
6.60
3
8.30
3
8.30
3
10.00
3
10.00
3
5.00
3
6.60
3
5.00
3
6.60
6
6.60
6
6.60
6
8.30
6
8.30
6
10.00
6
10.00
Am perage
Line
Wire
Size at
Current Am pacity 75oCƒ
13.5
16.6
12
8.2
10.0
14
4.6
5.5
14
22.0
27.3
10
13.2
16.3
12
7.0
8.5
14
30.2
37.5
8
17.9
22.1
10
9.4
11.5
14
43.0
53.5
6
25.1
31.1
10
13.0
16.0
12
29.9
37.1
8
15.5
19.1
12
62.5
76.3
3
36.1
44.6
6
18.0
22.3
10
48.1
59.0
6
24.0
29.5
10
60.2
73.5
4
30.1
36.8
8
72.2
87.9
3
36.1
44.0
8
84.2
103.6
2
CFM
„
420
420
420
520
520
520
620
620
620
666
666
666
666
666
1125
1125
1125
1700
1700
1700
1700
1700
1700
2250
TemperAir
Ship
ature
Throw Velocity Weight
Rise oF (feet)
FPM
(lbs)
23
17
403
36
23
17
403
36
23
17
403
36
31
19
500
36
31
19
500
36
31
19
500
36
36
21
590
36
36
21
590
36
36
21
590
36
47
22
640
41
47
22
640
41
47
22
640
41
57
22
640
41
57
22
640
41
42
35
703
102
42
35
703
102
42
35
703
102
40
35
1062
102
40
35
1062
102
46
45
1062
102
46
45
1062
102
56
45
1062
102
56
45
1062
102
50
45
1062
204
42.1
51.9
6
2250
50
45
703
204
96.3
48.1
120.4
60.2
144.5
72.2
118.2
59.0
147.1
73.6
176.0
88.0
1
6
0
4
0
3
2250
2250
3400
3400
3400
3400
50
56
46
46
56
56
45
45
48
48
48
48
703
703
1062
1062
1062
1062
204
204
204
204
204
204
NOTES:
 Model No. Key: First No. = KW; Second No. = Phase; Third No. = Voltage
‚ a) All motors are 240/60/1
AEUH 3 through 12 KW are equipped with one 1/20 HP open motor.
EUH 15 through 30 KW are equipped with one 1/6 HP totally enclosed motor.
EUH 35 through 60 KW are equipped with two 1/6 HP totally enclosed motors.
b) All 480 volt units have 480/240 volt transformer to power a 240 volt fan motor.
c) 15 through 60 KW units are equipped with a 24 volt control transformer
d) All three phase units have elements wired delta
5. Warranty
Refer to limited warranty information on the Warranty Card in the "Owner's Envelope".
THE WARRANTY IS VOID if wiring is not in accordance with the diagram furnished with
the heater and with both local and national electrical codes.
Form 411, Page 2
ƒWire size based on type THW, 75oC wire with
a 150 foot run.
„CFM based on standard air. Final air
temperature based on 60oF entrance air.
WARNING
Turn off power supply when
servicing this heater.
6. Dimensions
Figure 1 Dimensions
(inches and
millimeters) Model AEUH
13-1/2 (343)
14 (356)
1-1/2 (38)
7 (178)
7 (178)
Hanger
15-3/8
(391)
2 (51)
Electrical Connection
Knockout
1-1/2 (38)
1-3/8 (35)
Figure 2 Dimensions
(inches and
millimeters) Model EUH,
Sizes 15 - 30
Front View
Side View
16-3/4 (425)
18-1/4 (464)
24-3/4
(629)
18-3/4 (476)
Rear View
Figure 3 Dimensions
(inches and
millimeters) Model EUH,
Sizes 35 - 60
Side View
18-1/4 (464)
35-1/4 (895)
24-3/4
(629)
37-1/4 (946)
Rear View
Side View
Form 411 (Version D), Mfg P/N 142272, Page 3
7. Unit Heater Location
8. Uncrating/Shipping Damage
For best results, the heater should be placed according to these general
guidelines. A unit should be located from 8 to 12 feet above the floor.
Heaters should always be arranged to blow toward or along exposed
wall surfaces, if possible. Where two or more units are installed in the
same room, a general scheme of air circulation should be maintained
for best results.
Suspended heaters are most effective when located as close to the working zone as possible, and this fact should be kept in mind when determining the mounting heights to be used. However, care should be exercised to avoid directing the discharged air directly on the room occupants. Partitions, columns, counters, or other obstructions should be
taken into consideration when locating the unit heater. The heater should
be located so that a minimum quantity of air will be deflected by any
obstacles.
In smaller building areas with one or two outside walls, a single unit as
illustrated in Figure 4 may be sufficient.
The electric heater is shipped completely assembled. Immediately
upon uncrating, check the specifications and electric characteristics of the unit to be sure that the electric supply at
the installation site is compatible with the heater. Check the
Figure 4 Placement of
Single Unit in
Smaller Area
Larger building areas may require multiple units installed as illustrated
in Figure 5, especially where three or four walls are exposed to the
outside environment. Units should be arranged for providing perimeter air circulation where the airstream of one supports that of another.
Figure 5 Arrangement of
Multiple Units in a
Larger Area
unit for any damage that may have been incurred in shipment, and if
any damage is found, file a claim with the transporting agency. The
heater was inspected at the factory immediately prior to crating.
Be sure any shipped-separate, field-installed optional components are
at the installation site.
9. Field-Installed Option Kits
Installation of these options should be done by a qualified service person in accordance with these instructions and in compliance will all
codes and requirements having jurisdiction. Failure to follow instructions could result in death serious injury, and/or property damage. The
qualified agency performing this work assumes responsibility for this
installation.
9A. Vertical Louvers (Option AX3) Model EUH only
If vertical louvers are being added to a Model EUH heater, they are
shipped separately for field assembly.
The option package includes:
EUH Size
15-30
35-60
Qty
Qty
2
4
6
12
12
24
P/N
Com pone nt De scription
24041 Vertical Louver Supports
24038 Vertical Louvers
11813 Screw s
Install the vertical louvers before suspending the heater.
9B. Internal Thermostats (Option
CL12 and CL16) - Model AEUH
only
Model AEUH heaters may be controlled by an optional internally
mounted thermostat. The thermostat attaches to the inner side of the
rear access panel and is wired to the heater. Option CL12 applies to all
models except AEUH 5-1-24. Option CL16 is the internal thermostat
for Model AEUH 5-1-24 only. If installing one of these internal thermostat kits, select and follow the appropriate instructions.
Internal Thermostat Option, Option CL12
(P/N 46362) - Applies to all AEUH Models
except AEUH 5-1-24 (for Model AEUH 5-1-24,
see Option CL16 below)
Option CL12 includes:
Care should be taken to prevent the hot delivered air from one unit
from entering the inlet of adjacent units.
When units are located in the center of the space to be heated, the air
should be discharged toward the exposed walls.
In large areas, units should be located to discharge air along exposed
walls with extra units provided to discharge air in toward the center of
the area.
At those points where infiltration of cold air is excessive, such as at
entrance doors and shipping doors, it is desirable to locate the heater
so that it will discharge directly toward the source of cold air from a
distance of 15 to 20 feet.
Form 411, Page 4
Qty
P/N
2
1
2
20913
45541
46363
1
1
46365
46859
Com ponent Des cription
Plas tic Wire Tie s
Wire C on nector (cente r line s p lice )
Wire As s e m b lies (one w ire m a rked
N o. 1; one w ire m a rked N o. 2)
Th erm o s tat (w ith s cre w s )
Th erm o s tat Knob
WARNING: If heater is installed, disconnect
power before installing internal thermostat.
Installation Instructions for Option CL12:
1. Remove the rear access panel from the heater.
2. Find the knockout labeled "heat" in the access panel. Remove knockout creating a hole to insert the thermostat.
3. From the inner side of
the access panel, insert
the adjustment shaft of Figure 6 - Insert the thermostat
the thermostat through adjustment shaft through the
the hole. From the hole in the access panel.
outer side of the panel,
insert the two screws
through the panel and
into the thermostat
mounting plate. The
thermostat is now attached to the inner side
of the access panel.
4. Refer to the wiring diagram (on the access panel). Locate the plastic line connector that
connects wires No. 1 and No. 2. Remove the No. 2 wire from the
line connector. Lengthen Wire No. 2 by using the wire connector in
the kit to connect it to Wire No. 2 in the kit. Connect the lengthened
No. 2 wire to Terminal No. 2 on the thermostat.
Lengthen the No. 1 wire by attaching the No. 1 wire in the kit.
Connect the lengthened No. 1 wire to Terminal No. 1 on the thermostat.
5. Use the tie wrap provided to make sure the wires do not interfere
with the fan blade.
6. Re-attach the access panel/thermostat assembly.
7. Push the adjustment knob on to the shaft of the thermostat. Use the
knob to set the thermostat. The heater is
Figure 7 - Push the knob on
ready for control from
to the shaft of the
the internally mounted
thermostat.
thermostat.
If the heater is installed, check for
proper operation.
If the heater is not installed, continue with
the installation.
Internal Thermostat Option, Option CL16 (P/N 46360) -Applies to Model AEUH 5-1-24 only
Option CL16 includes:
Qty
P/N
2
1
1
1
20913
45541
46361
46859
Component Description
Plas tic Wire Ties
Wire Connector (center line s plice)
Therm os tat (with s crews )
Therm os tat Knob
WARNING: If heater is installed, disconnect
power before installing internal thermostat.
Installation Instructions for Option CL16:
1. Remove the rear access panel from the heater.
2. Find the knockout labeled "heat" in the access panel. Remove knockout creating a hole to insert the thermostat.
3. From the inner side of the access panel, insert the adjustment shaft
of the thermostat through the hole. From the outer side of the panel,
insert the two screws through the panel and into the thermostat
mounting plate. The thermostat is now attached to the inner side of
the access panel.
Figure 8 - Insert
the adjustment
shaft of the
thermostat
through the hole
in the access
panel.
Sensing Tube
4. Refer to the wiring diagram (on the access panel). Locate the plastic line connector that connects wires No. 1 and No. 2 (marked X
on the diagram). Remove the No. 2 wire from the line connector
and using the wire connector in the kit, connect the No. 2 wire to
Terminal No. 2 on the thermostat.
Connect the No. 1 wire to Terminal No. 1 on the thermostat.
5. Use the tie wrap provided to attach the thermostat sensing bulb (See
Figure 8) to the inside of the fan guard. (Be sure that the fan blade
does not hit any wires.)
6. Re-attach the access panel/thermostat assembly.
7. Push the adjustment knob
on to the shaft of the therFigure 9 - Push the knob on
mostat. Use the knob to
to the shaft of the
set the thermostat. The
thermostat.
heater is ready for control
from the internally
mounted thermostat.
If the heater is installed,
check for proper operation.
If the heater is not installed, continue with the installation.
9C. Optional Fan Control (Options
CQ2 and CH1) - Model AEUH only
There are two types of optional fan control kits. Option CQ2, the optional fan time delay switch delays fan startup preventing circulation
of cold air and also delays fan shutdown purging the residual heat from
the heater. Option CH1, the manual summer fan switch, can be used
only in conjunction with the fan time delay switch. With the manual
fan switch option, the heater is equipped with the fan time delay option, and the fan can also be used for summer air circulation when the
heater is not in use. Instructions follow for installing both of these
option kits. Select the appropriate set of instructions and follow carefully.
Fan Time Delay Switch, Option CQ2 (P/N 46385) - The optional fan time delay switch prevents circulation of cold air on startup
and purges the residual heat on shutdown.
Option CQ2 includes:
Qty
P/N
1
2
11813
46383
1
1
46384
46386
Component Description
Sheet Metal Screw
Wire Assemblies, 6" (one marked L1 and No.
8; one marked L2 and No. 7)
Wire Assembly, 4" (marked No. 5 and No. 10)
Time Delay Relay Switch
WARNING: If the unit is installed, disconnect
the power before installing the time delay relay
switch.
Form 411 (Version D), Mfg P/N 142272, Page 5
9C. Optional Fan Control - Model
AEUH only (cont'd)
Installation Instructions for Option CQ2:
1. Remove the rear access panel from the heater.
2. Install the Time Delay Relay Switch -- The time delay relay switch
will be installed on the inner right side of the bottom of the heater.
At the designated location, there are two 7/64" diameter holes prepunched in the bottom panel. Place the relay (on the inside) so that
the pin on the base extends through the hole closest to the rear of
the heater. Insert the screw through the other hole and attach the
relay to the heater.
3. Wire the Time Delay Relay Switch (Refer to the wiring diagram) a) Locate the wire connector that connects Wire No. 3 to No. 7.
Remove Wire No. 3 from the wire connector and connect it to the
No. 3 terminal on the time delay relay.
b) Locate the wire connector that connects Wire No. 4 to Wire No.
5. Remove Wire No. 4 from the wire connector and connect it to
the No. 4 terminal on the time delay relay.
c) Kit Wire Marked L2 and No. 7 -- Connect the No. 7 end to the
No. 7 wire on the heater. Connect the L2 end to the L2 connection
point. (The end of the wire marked L2 should be connected to the
L2 connection point. The connection point could be either a contactor wire or a wire nut.)
d) Kit Wire Marked L1 and No. 8 -- Connect the L1 end to connection point L1 and the No. 8 end to the No. 8 Terminal on the time
delay relay.
e) Kit Wire Marked No. 5 and No. 10 - Connect the No. 5 end to
the No. 5 wire on the heater and the No. 10 end to No. 10 terminal
on the time delay relay.
4. Verify that all wires are clear of the fan blade
5. Replace the access panel.
6. The fan time delay relay switch is completely installed. NOTE: If
the heater is controlled by an external thermostat which interrupts
the power supply to the heater, the time delay feature will not work
when the thermostat turns the unit off.
Manual Summer Fan Switch, Option CH1 (P/N 46389) - The optional summer fan switch allows the fan to operate to provide summer
air circulation without heat. Option CH1 includes the time delay relay
switch (Option CQ2) which prevents circulation of cold air on startup
and purges the residual heat on shutdown. (The manual summer fan
switch cannot be installed without the time delay relay switch.)
Option CH1 includes:
Qty
P/N
2
44024
1
1
101901
46385
Component Description
Wire Assemblies (one marked No. 8; one
marked No. 10)
SPDT Manual Fan Switch
Time Delay Relay Switch Package (see
parts list above for Option CQ2)
Installation Instructions for Option CH1:
1. Remove the rear access panel from the heater.
2. Install the Manual Fan Switch -- Find and remove the knockout
labeled "fan only" in the access panel. Remove the nut from the
front of the switch. From the inner side of the access panel, insert
the switch through the hole. Replace the nut to attach the switch.
3. Install the Time Delay Relay Switch -- The time delay relay switch
will be installed on the inner right side of the bottom of the heater.
At the designated location, there are two 7/64" diameter holes prepunched in the bottom panel. Place the relay (on the inside) so that
the pin on the base extends through the hole closest to the rear of
the heater. Insert the screw through the outer hole and attach the
relay to the heater.
Form 411, Page 6
4. Wire the Time Delay Relay Switch (Refer to the wiring diagram) a) Locate the wire connector that connects Wire No. 3 to No. 7.
Remove Wire No. 3 from the wire connector and connect it to the
No. 3 terminal on the time delay relay.
b) Locate the wire connector that connects Wire No. 4 to Wire No.
5. Remove Wire No. 4 from the wire connector and connect it to
the No. 4 terminal on the time delay relay.
c) Kit Wire Marked L2 and No. 7 -- Connect the No. 7 end to the
No. 7 wire on the heater. Connect the L2 end to the L2 connection
point. (The end of the wire marked L2 should be connected to the
L2 connection point. The connection point could be either a contactor wire or a wire nut.)
d) Kit Wire Marked L1 and No. 8 -- Connect the L1 end to connection point L1 and the No. 8 end to the No. 8 Terminal on the time
delay relay.
e) Kit Wire Marked No. 5 and No. 10 - Connect the No. 5 end to
the No. 5 wire on the heater and the No. 10 end to No. 10 terminal
on the time delay relay.
5. Wire the Manual Fan Switch (refer to the wiring diagram) -- a)
Kit Wire marked No. 8 -- Connect one end to Terminal No. 8 on the
fan time delay switch and the other to Terminal No. 8 on the summer fan switch.
b) Kit Wire Marked No. 10 -- Connect one end to Terminal No. 10
on the fan time delay switch and the other to Terminal No. 10 on the
summer fan switch.
6. Verify that all wires are clear of the fan blade
7. Replace the access panel.
8. The summer fan switch is installed. NOTE: If the heater is controlled by an external thermostat which interrupts the power supply
to the heater, the time delay feature will not work when the thermostat turns the unit off, and the manual summer fan switch will not
operate.
10. Clearance to Combustibles
Clearances from Combustibles
Model
Top Bottom Sides
AEUH inches
6
6
6
mm 152
152
152
EUH
inches
12
12
12
mm 305
305
305
Back
6
152
12
305
11. Suspension
Before installing this heater, check the supporting structure to be used
to verify that it has sufficient load-carrying capacity to support the
weight. See Paragraph 4 for weights of all sizes of Model EUH and
AEUH heaters.
Model AEUH -- Model AEUH heaters have single-point suspension
and may be suspended from either a wall or ceiling by using an optional Hanger Bracket Kit (see Figure 10) or a comparable field-supplied bracket. Heaters must be installed at least six inches from any
vertical or horizontal surface and at least six feet from the floor. Do not
install the heater in such a way that the inlet and/or outlet airflow could
be restricted. Heater must be level. Do not place or add additional weight
to the suspended unit.
Model EUH -- Model EUH heaters have two-point suspension and are
equipped with 1" NPT swivel connectors. Suspend the heater by connecting the swivel connectors to 1" threaded pipe hangers. Units must
be level. Do not place or add additional weight to the suspended unit.
See Figures 11A and 11B.
Figure 10 - Optional Hanger Brackets - Model AEUH
Ceiling Mounting Bracket
Ceiling
Wall Mounting
Bracket
6” (152mm)
Minimum
1/2” Lag bolts by installer
Lockwasher
6” (152mm)
minimum
1/2-13 Threaded rod
1/2-13 Hex nut (3)
Rod coupler
Access Panel
6” (152mm)
Minimum
Minimum
6 ft (1.8M)
to floor
Ceiling Mounting Kit (Option CK4, P/N 46356)
Figure 11A - Suspension Dimensions for
Model EUH 15/20/25/30 KW units
16-3/4”
(425mm)
18-5/8”
(473mm)
Minimum
6ft (1.8M)
to floor
Wall
Wall Mounting Kit (Option CK5, P/N 46354)
Figure 11B - Suspension Dimensions for Model
EUH 35/40/50/60 KW units
35-3/16” (894mm)
37-1/4” (946mm)
Form 411 (Version D), Mfg P/N 142272, Page 7
12. Electrical
13. Thermostat
All wiring must be done by a qualified electrician in compliance with all local
codes and the National Electric Code (latest edition).
Follow the wiring diagram furnished with your equipment. Field wiring is required. Typical wiring diagrams for all models are shown in Paragraph 16.
Both Model AEUH and Model EUH electric heaters are
designed for automatic control from a thermostat. The thermostat is not standard equipment.
If using an optional internal thermostat in a Model AEUH
heater, follow the instructions in Paragraph 9B.
If installing an external thermostat, whether using a thermostat option from Reznor or a field-supplied thermostat,
install the thermostat according to the manufacturer's instructions. Locate an external thermostat on an inside wall,
five feet above the floor. Do not locate a thermostat in the
path of warm or cold air currents, nor in corners where air
may be pocketed. Do not install on a cold outside wall. When
more than one unit is cycled from one thermostat, separately
activated relays should be installed at the unit thermostat
connections.
EUH Models 35 through 60 may be operated by a two-stage
thermostat for two-stage heater operation. The two-stage
wiring diagrams in Paragraph 16 include instructions for
wiring two-stage thermostats and the operating sequence of
the two stage operation.
F ie ld W irin g - Ex te rn a l C o n tro l W irin g
T o ta l W ire
D ista n ce fro m
M in im u m R e co m m e n d e d
L e n g th
H e a te r to C o n tro l
W ire S iz e
150'
250'
350'
75'
125'
175'
#18 gauge
#16 gauge
#14 gauge
Electrical Connections
1. After the heater is suspended, remove the electrical entrance knockout from
the heater side panel.
2. Remove the rear access panel from the heater.
3. Follow the schematic attached to the rear access panel and make connections
inside the heater. All wiring must be done in accordance with the latest edition
of the National Electric Code and all state and local electrical codes.
4. Replace the rear access panel.
Fuses - Depending on the model and size of heater, internal fuses may be required. The following lists show which units are equipped with internal fuses.
Model
AEUH
3-1-24
3-3-24
3-3-48
5-1-24
5-3-24
5-3-48
7-1-24
7-3-24
7-3-48
10-1-24
10-3-24
10-3-48
12-3-24
12-3-48
At Rated Volts
In te rn al
Fu si n g
Q u an ti ty of
Fu se s
No n e
No n e
No n e
No n e
No n e
No n e
6 A mp
No n e
No n e
6 A mp
No n e
No n e
6 A mp
No n e
0
0
0
0
0
0
2
0
0
2
0
0
2
2
Model
EUH
At Rated Volts
15-1-24
15-3-24
15-3-48
20-3-24
20-3-48
25-3-24
25-3-48
30-3-24
30-3-48
35-3-24
35-3-48
40-3-24
40-3-48
50-3-24
50-3-48
60-3-24
60-3-48
In te rn al
Fu si n g
Q u an ti ty of
Fu se s
FRN 30
No n e
No n e
FRN 35
No n e
FRN 45
No n e
FRN 60
No n e
FRN 30
FRN 35
No n e
FRN 35
FRS 20
FRN 45
FRS 25
FRN 60
FRS 30
6
0
0
6
0
6
0
6
0
6
6
0
12
12
12
12
12
12
CAUTION: Make sure the thermostat has an
adequate VA rating for the total requirements.
Add coil rating of all relays and match
thermostat rating.
14. High Temperature
Limit Switch
All electric heaters are equipped with a high temperature
safety limit switch which shuts off the power to the unit if
normal operating temperatures are exceeded. If the limit
switch should activate, check if anything is preventing the
air from flowing through the heater.
15. Fan Motor
Motors are equipped with thermal overload protection of
the automatic reset type. Make certain that the correct voltage is available at the motor. Lubricate, if provided with oil
cups or grease fittings.
16. Typical Wiring Diagrams
16A. Wiring Diagrams for Models AEUH (Figures 12, 13A and 13B))
Figure 12 Model
AEUH, W.D.
45561
Form 411, Page 8
Used on AEUH Series
120, 208, 240 or 277 Volt/Single Phase
3 and 5 KW
X = Break in Line for Optional Equipment
Figure 13A - Model AEUH,
W.D. 45566
Figure 13B - Model AEUH, W.D. 46367
Used on AEUH Series
480 Volt Three Phase
3, 5, or 7 KW
X = Break in Line for Optional Equipment
Form 411 (Version D), Mfg P/N 142272, Page 9
16. Typical Wiring Diagrams (cont'd)
16B. Operating Sequence and Notes for Wiring Diagrams Nos. 40214, 40215, 40217 (Applies
to Figure 14, 15, and 16)
Figure 14 - Model EUH 15-3-24A, 240 Volt, Three
Phase, One-Stage Wiring
W.D. 40214
Operating Sequence:
1. Turn on power to the heater.
2. Thermostat calls for heat.
a) Energizing the contactor(s)
(CT1 and CT2), closing circuits to heating elements.
b) Energizing the time delay relay coil, energizing the fan
motor after a delay of approximately ten seconds.
3. Thermostat is satisfied.
a) Contactor(s) (CT1 and CT2)
opens circuit to heating elements.
b) Time delay relay contacts keep
fan operating for approximately 20 seconds.
Wiring Diagram Notes:
1. Dotted wiring furnished and installed by others.
2. Solid wiring supplied and installed by the heater manufacturer.
3. Thermostat supplied as optional
equipment.
4. The control transformer has a
dual voltage primary. For 240
volt, use black and yellow leads
(cap red); secondary side (24
volt) of transformer, use blue and
brown leads.
Figure 15 - Model EUH 15-1-24A, 240 Volt, Single Phase, One-Stage Wiring
W.D. 40215
OPERATING SEQUENCE
FIELD CONTROL WIRING
1. TURN ON POWER TO UNIT.
2. THERMOSTAT CALLS FOR HEAT.
(A) ENERGIZING THE CONTACTOR (CT-1 & CT-2), CLOSING
CIRCUITS TO HEATER ELEMENTS.
(B) ENERGIZING THE TIME DELAY RELAY COIL,
NOTE
ENERGIZING THE FAN MOTOR AFTER A DELAY
1. DOTTED WIRING FURNISHED AND INSTALLED BY OTHERS.
OF APPROXIMATELY TEN SECONDS.
2. SOLID WIRING SUPPLIED AND INSTALLED BY REZNOR.
3. THERMOSTAT SATISFIED.
3. THERMOSTAT SUPPLIED AS OPTIONAL EQUIPMENT.
(A) CONTACTOR (CT-1 & CT-2) OPENS CIRCUIT TO
4. ON 208/240V. UNITS THE CONTROL TRANSFORMER
HEATING ELEMENTS.
HAS A DUAL VOLTAGE PRIMARY.
(B) TIME DELAY RELAY CONTACTS KEEP FAN
FOR 208V. UNITS USE BLACK AND RED LEADS (CAP YELLOW).
ON FOR APPROXIMATELY 20 SECONDS.
FOR 240V. UNITS USE BLACK AND YELLOW LEADS (CAP RED).
SECONDARY SIDE OF TRANSFORMER (24 VOLT) USE BLUE
AND BROWN LEADS.
240/1/60 OR
208/1/60
FUSED DISCONNECT
SWITCH OR CIRCUIT
BREAKER SUPPLIED
AND INSTALLED BY
OTHERS.
WD #40215
REV #2
BK
BK
W
C
BL
LINE V
L1
T2
L2
CT-2
T3
L3
F
24 VOLT
CONTACTOR
COIL (CT-2)
24V
CONTROL
TRANSFORMER
40 VA.
TIME DELAY
RELAY
H
H
CT-1
L2
FUSE
FUSE
CT-2
Form 411, Page 10
T1
FUSE
L1
FUSE
T1
E
125
HIGH LIMIT
BL
CT-1
D
BR
CT-2
Y
FUSE
FUSE
B
R
A
L3
BK
L2
Y
L1
BK
USED ON MODELS
EUH-11-1-20-A
EUH-15-1-24-A
24 VOLT
CONTACTOR
COIL (CT-1)
BR
TOTAL WIRE MINIMUM RECOMMENDED
LENGTH
WIRE SIZE
150 FEET
#18 GA.
250 FEET
#16 GA.
350 FEET
#14 GA.
T2
CT-1
L3
T3
FAN MOTOR
240/1/60
1/6 HP
5
4
1
3
Figure 16 - Models
EUH 20-3-24A,
EUH 25-3-24A,
EUH 30-3-24A,
240 Volt, Three Phase,
One-Stage Wiring
W.D. 40217
16C. Operating Sequence and Notes for Wiring Diagrams No. 40218 (Applies to Figure 17)
Operating Sequence:
1. Turn on power to the heater.
2. Thermostat calls for heat.
a) Energizing the #1 heating element.
b) Energizing the #1 fan motor after a delay of approximately ten seconds through contacts (4-5) of #1 time
delay relay.
c) Energizing the #2 heating element in approximately 30
seconds through contacts (1-3) of #1 time delay relay.
d) Energizing the #2 fan motor in approximately 40 seconds through contacts (4-5) of #2 time delay relay.
3. Thermostat is satisfied.
a) #1 heating element de-energized.
b) #2 heating element de-energized in approximately 20 seconds.
c) #1 fan motor de-energized in approximately 20 seconds.
d) #2 fan motor de-energized in approximately 40 seconds.
Notes:
1. Dotted wiring furnished and installed by others.
2. Solid wiring supplied and installed by the heater manufacturer.
3. Thermostat supplied as optional equipment.
4. The control transformer has a dual voltage primary. For 240 volt, use
black and yellow leads (cap red); secondary side (24 volt) of transformer,
use blue and brown leads.
Figure 17 - Models EUH 35-3-24A,
EUH 40-3-24A, EUH 50-3-24A,
EUH 60-3-24A, 240 Volt, Three
Phase, One-Stage Wiring
W.D. 40218
Form 411 (Version D), Mfg P/N 142272, Page 11
16. Typical Wiring Diagrams (cont'd)
16D Operating Sequence and Notes are on Wiring Diagram No. 40216, Figure 18
Figure 18 - Models EUH 15-3-48A, EUH 20-3-48A, EUH 25-3-48A, EUH 30-3-48A; 480 Volt, Three Phase, One-Stage
Wiring; W.D. 40216
OPERATING SEQUENCE
1. TURN ON POWER TO UNIT.
2. THERMOSTAT CALLS FOR HEAT.
(A) ENERGIZING THE CONTACTOR (CT) CLOSING CIRCUITS TO
HEATER ELEMENTS.
(B) ENERGIZING THE TIME DELAY RELAY COIL, ENERGIZING THE
FAN MOTOR AFTER A DELAY OF APPROX. TEN SECONDS.
3. THERMOSTAT SATISFIED.
(A) CONTACTOR (CT) OPENS CIRCUIT TO HEATING ELEMENTS.
(B) TIME DELAY RELAY CONTACTS KEEP FAN ON FOR APPROX.
20 SECONDS.
480/3/60
L1
L2
L3
WD #40216 REV#3
480 V
FUSED DISCONNECT
SWITCH OR CIRCUIT
BREAKER SUPPLIED
AND INSTALLED BY
OTHERS.
240 V
MAIN TRANSFORMER
480/240 VOLT
0.25 KVA
OPTIONAL CONTROL
THERMOSTAT
15 AMP
FUSES
R
24 VOLT
CONTACTOR
COIL (CT-1)
W
BK
SEE NOTE #4
R
C
L1
L1
T1
F
24 VOLT
CONTACTOR
COIL (CT-2)
125
HIGH LIMIT
24V
BR
240 V
T1
E
BR
CT-1
D
BL
Y
CT-2
B
BR
A
BL
TERMINAL
BLOCK
IN UNIT
R
L3
BK
L2
Y
L1
R
BK
R
CONTROL
TRANSFORMER
TIME DELAY
RELAY
H
H
40 VA.
CT-2
CT-1
BK
T2
L2
L2
CT-2
T3
WIRING CODE
BLACK - BK
BROWN - BR
RED - R
ORANGE - O
YELLOW - Y
GREEN - G
BLUE - BL
PURPLE - PR
WHITE - W
BR
R
4
1
3
BK
T2
FAN MOTOR
240/1/60
1/6 HP
CT-1
L3
5
L3
T3
NOTE
1. DOTTED WIRING FURNISHED AND INSTALLED BY OTHERS.
2. SOLID WIRING SUPPLIED AND INSTALLED BY REZNOR.
3. THERMOSTAT SUPPLIED AS OPTIONAL EQUIPMENT.
4. REPLACE WITH TIME DELAY BUSSMAN TRON-FNQ15 480
VOLT FUSES OR EQUIVALENT.
USED ON MODELS
EUH 10-3-48-A
EUH 15-3-48-A
EUH 20-3-48-A
EUH 25-3-48-A
EUH 30-3-48-A
FIELD CONTROL WIRING
TOTAL WIRE MINIMUM RECOMMENDED
LENGTH
WIRE SIZE
150 FEET
#18 GA.
250 FEET
#16 GA.
350 FEET
#14 GA.
16E. Operating Sequence and Notes for Wiring Diagrams Nos. 40219 and 40220 (Applies to
Figure 19 and 20)
Operating Sequence:
1. Turn on power to the heater.
2. Thermostat calls for heat.
a) Energizing the #1 heating element.
b) Energizing the #1 fan motor after a delay of approximately ten seconds through contacts (4-5) of #1 time
delay relay.
c) Energizing the #2 heating element in approximately 30
seconds through contacts (1-3) of #1 time delay relay.
d) Energizing the #2 fan motor in approximately 40 seconds through contacts (4-5) of #2 time delay relay.
3. Thermostat is satisfied.
Form 411, Page 12
a) #1 heating element de-energized.
b) #2 heating element de-energized in approximately 20 seconds.
c) #1 fan motor de-energized in approximately 20 seconds.
d) #2 fan motor de-energized in approximately 40 seconds.
Wiring Diagram Notes:
1. Dotted wiring furnished and installed by others.
2. Solid wiring supplied and installed by the heater manufacturer.
3. Thermostat supplied as optional equipment.
4. Replace with time delay Bussman #TRON FNQ15, 480 volt fuses, or equivalent.
Figure 19 - Models
EUH 35-3-48A
480 Volt, Three Phase, One-Stage Wiring
W.D. 40219
Figure 20 - Models EUH 40-3-48A,
EUH 50-3-48A, EUH 60-3-48A,
480 Volt, Three Phase, One-Stage Heating
W.D. 40220
16F. Field Wiring Instructions for Two-Stage Thermostat Operation and Operating
Sequence and Notes for Wiring Diagrams Nos. 41284, 41285 and 41286 (Applies to
Figures 21, 22 and 23, pgs 14-15)
Field Wiring Instructions for Optional Two-Stage Thermostat Operation:
1. Remove black 24 gauge wire from Terminal D and connect with control wire from thermostat Terminal W2 with wire nut.
2. Add control wire from thermostat Terminal W1 to Terminal D.
3. Add control wire from thermostat Terminal R to Terminal C.
Operating Sequence:
1. Set thermostat switch at "OFF" position.
2. Turn on power to the heater.
3. Set thermostat switch at "ON" position.
4. Low stage of thermostat calls for heat.
a) Energizing the #1 heating element.
b) Energizing the #1 fan motor after a delay of approximately 10
seconds through contacts (4-5) of #1 time delay relay.
5. High stage of thermostat calls for heat.
a) Energizing the #2 heating element (Note: High stage thermo-
stat circuit is wired through contacts (1-3) of #1 time delay relay
which prevents #1 and #2 heating elements from being energized
simultaneously.)
b) Energizing the #2 fan motor in approximately 10 seconds.
6. High stage thermostat is satisfied.
a) #2 heating element de-energized.
b) #2 fan motor de-energized in approximately 20 seconds.
7. Low stage thermostat is satisfied.
a) #1 heating element de-energized.
b) #1 fan motor de-energized in approximately 20 seconds.
Form 411 (Version D), Mfg P/N 142272, Page 13
16. Typical Wiring Diagrams (cont'd)
Wiring Diagram Notes (Figures 21, 22, 23):
1. Dotted wiring furnished and installed by others.
2. Solid wiring supplied and installed by the heater manufacturer.
3. Thermostat supplied as optional equipment.
4. Replace with time delay Bussman #TRON FNQ15, 480 volt fuses,
or equivalent.
Figure 21 - Models EUH 40-3-48A,
EUH 50-3-48A, EUH 60-3-48A,
480 Volt, Three Phase, Optional Two-Stage Heating
W.D. 41284
Figure 22 - Models EUH 35-3-48A,
480 Volt, Three Phase, Optional Two-Stage Heating
W.D. 41285
Form 411, Page 14
Figure 23 - Models EUH 35-3-24A,
EUH 40-3-24A, EUH 50-3-24A,
240 Volt, Three Phase, Optional Two-Stage Heating
W.D. 41286
17. Maintenance
Like all quality equipment, this unit will operate with a minimum of
maintenance. However, to ensure long life and satisfactory performance,
the following service regime is recommended.
sure it is secure to the motor shaft. Lubricate the motor if it is provided
with oil cups or grease fittings.
WARNING: Turn off the power when
servicing heaters.
Annually -- The heating element should be checked once a year,
more often in areas where air is heavily sooted or dust laden. To clean
the heating element, remove the louver frame. Using steel wool or similar material, carefully clean all dust and dirt from the heating element
fins. With an air hose or brush, clean the inside of the cabinet, especially the bottom and sides where dirt and dust might accumulate.
o
Every 4 Months -- Heaters should be inspected every four
months where the equipment is operating under normal conditions. If
the heaters are located in areas where an unusual amount of dust, soot,
or other impurities are contained in the air, more frequent inspection is
recommended.
Keep front and rear air openings of the unit free of grease and dirt.
Check motor for cleanliness. Remove dirt and grease from the fan, the
outside of the motor, and especially around the shaft. Check fan to be
o
CAUTION: Wearing eye protection is
recommended when cleaning the heating
element and cabinet.
Form 411 (Version D), Mfg P/N 142272, Page 15
FOR SERVICE OR REPAIR, FOLLOW THESE STEPS IN ORDER:
FIRST:
Contact the installer:
NAME ______________________________________________________________________________
ADDRESS __________________________________________________________________________
____________________________________________________________________________________
____________________________________________________________________________________
PHONE _____________________________________________________________________________
SECOND:
Contact the nearest distributor (See telephone yellow pages.)
THIRD:
Contact:
REZNOR®/Thomas & Betts Corporation
150 McKinley Avenue
Mercer, PA 16137
Phone: (724) 662-4400
Model No. __________________________________________________________________________________________
Unit Serial No. ______________________________________________________________________________________
Date of Installation ___________________________________________________________________________________
Form 411, Page 16
©1999 Thomas & Betts Corporation, All rights reserved.
Printed in U.S.A.
MANUFACTURER OF GAS, OIL, ELECTRIC HEATING AND VENTILATING SYSTEMS
799 1M WE Form 411-D.5
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