Reznor Electric Unit Heater Installation, Operation, and Maintenance
Model EUH
DANGER
Read all instructions before using the heater. Failure to follow safety warnings exactly could result in serious injury, death, or property damage. Improper installation, adjustment, alteration, service, or maintenance can cause serious injury, death, or property damage. Installation and service must be performed by a qualified technician. Be sure to read and understand the installation, operation, and service instructions in this manual. This heater has hot parts inside. Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. This heater is hot when in use. To avoid burns, do not let bare skin touch hot surfaces. Do not operate any heater after it malfunctions. Disconnect power at the service panel and have the heater inspected by a reputable electrician before reusing. Do not use outdoors. Do not insert or allow foreign objects to enter any heater opening as this may cause electrical shock, fire, or damage to the heater. To prevent a possible fire, do not block air intakes or exhaust in any way whatsoever. Use this heater only as recommended by the manufacturer. Any other use may cause electrical shock, fire, or damage to the heater.
IMPORTANT INSTRUCTIONS
SAVE THESE INSTRUCTIONS
General Information
This unit heater has been tested for capacity and efficiency to provide many years of safe and dependable comfort when properly installed and maintained. Regular maintenance ensures satisfactory operation year after year. Abuse, improper use, or improper maintenance can shorten the appliance's life and create unsafe hazards. Periodic maintenance is recommended for optimum performance and to minimize equipment failure. Proper maintenance requires specific tools and mechanical skills.
Important Safety Information
Read all information in this manual thoroughly and become familiar with the unit's capabilities and use before operating or maintaining it. Pay attention to all dangers, warnings, cautions, and notes. Safety markings are used frequently to indicate the degree of seriousness.
- DANGER: Describes a potentially hazardous situation that, if not avoided, will result in severe personal injury or death and/or property damage.
- WARNING: Describes a potentially hazardous situation that, if not avoided, can result in severe personal injury and/or property damage.
- CAUTION: Describes a potentially hazardous situation that, if not avoided, can result in minor or moderate personal injury and/or property damage.
- NOTE: Provides important information that should not be ignored.
DANGER
Read these instructions carefully before installation and operation of the heater. Failure to adhere to the instructions could result in fire, electric shock, serious personal injury, death, or property damage. Review frequently for continuing safe operation and instruction of future users, if necessary.
WARNING
- Installation should be done by a qualified agency in accordance with these instructions. The qualified service agency installing this heater is responsible for the installation.
- This appliance is not intended for use by persons with reduced physical, sensory, or mental capabilities or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by a person responsible for their safety.
- Children should be supervised to ensure that they do not play with the appliance.
CAUTION
- The thermostat should not be considered an infallible device where maintaining a temperature is critical. In such cases, a monitoring system is imperative to avoid consequences of thermostat failure.
- This heater is not approved for use in corrosive atmospheres, wet or very humid locations such as marine greenhouses, or chemical storage areas.
- To prevent damage to the unit or its internal components, it is recommended that two wrenches be used when loosening or tightening nuts. Do not over tighten!
Warranty
Refer to the limited warranty form in the literature bag provided with the unit. The warranty is void if:
- Wiring is not in accordance with the diagram furnished with the heater.
- The unit is installed without proper clearance to combustible materials.
- The air delivery system is modified.
Certification
These electric unit heaters are listed by Intertek to UL 2021 and CSA C22.2 #46 for use in the US and Canada.
Installation Codes
These units must be installed in accordance with local building codes. Local authorities having jurisdiction should be consulted before installation to verify local codes and installation procedure requirements.
Heater Location
CAUTION: Do not locate the heater where it may be exposed to water spray, rain, or dripping water.
For best results, locate the heater considering the following:
- Arrange units to blow toward or along exposed wall surfaces, if possible. For multiple units in the same room, maintain a general scheme of air circulation for best results.
- Suspended heaters are most effective when located close to the working zone. Avoid directing discharged air directly on room occupants.
- Consider partitions, columns, counters, or other obstructions to minimize airflow deflection.
- In centrally located spaces, discharge air toward exposed walls. In large areas, locate units along walls and use additional units to discharge air toward the center.
Mounting Height
WARNING: If touched, the internal heater surfaces accessible from outside the heater will cause burns. Suspend the heater a minimum of 6 feet (1.8 meters) above the floor.
Generally, locate the unit 6–14 feet (1.8–4.3 meters) above the floor. For areas with excessive cold air infiltration (e.g., entrance doors, shipping doors), locate the unit to discharge directly toward the source of cold air from a distance of 15–20 feet (4.6–6.1 meters).
Heater Throw
Figure 1 illustrates heater throw patterns, and Table 1 lists throw distances for heaters suspended at varying mounting heights. Louver angles are relative to the top of the heater.
Figure 1. Heater Throw Patterns
Diagram shows a heater suspended at height H, with throw distances X (start of coverage), Y (end of coverage), and Z (where velocity drops below 50 ft/min). H is the distance from the bottom of the heater to the floor.
| H* (Feet (Meters)) | Unit Size (kW) | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 3 | 5 | 7 | 10 | 15 | 20 | 25 | 30 | ||
| Distance* or Angle | Feet (Meters) | ||||||||
| 6 (1.8) | X | 4 (1.2) | 5 (1.5) | 7 (2.1) | 6 (1.8) | 13 (4.0) | 11 (3.4) | 10 (3.0) | |
| Y | 8 (2.4) | 13 (4.0) | 15 (4.6) | 14 (4.3) | 19 (5.8) | 23 (7.0) | 28 (8.5) | 27 (8.2) | |
| Z | 18 (5.5) | 22 (6.7) | 36 (11.0) | 37 (11.3) | 42 (12.8) | 41 (12.5) | |||
| Downward louver angle | 36° | 27° | 22° | ||||||
| 8 (2.4) | X | 5 (1.5) | 9 (2.7) | 6 (1.8) | 14 (4.3) | 11 (3.4) | 9 (2.7) | 8 (2.4) | |
| Y | 10 (3.0) | 15 (4.6) | 14 (4.3) | 19 (5.8) | 28 (8.5) | ||||
| Z | 16 (4.9) | 32 (9.8) | 36 (11.0) | 37 (11.3) | 39 (11.9) | ||||
| Downward louver angle | 36° | 34° | 30° | 27° | |||||
| 10 (3.0) | X | 6 (1.8) | 6 (1.8) | 13 (4.0) | 12 (3.7) | 8 (2.4) | 9 (2.7) | ||
| Y | 15 (4.6) | 14 (4.3) | 18 (5.5) | 28 (8.5) | 27 (8.2) | 25 (7.6) | |||
| Z | 26 (7.9) | 34 (10.4) | 38 (11.6) | 36 (11.0) | |||||
| Downward louver angle | 36° | 32° | |||||||
| 12 (3.7) | X | 10 (3.0) | 11 (3.4) | 10 (3.0) | 12 (3.7) | 10 (3.0) | |||
| Y | 14 (4.3) | 15 (4.6) | 16 (4.9) | 22 (6.7) | 24 (7.3) | 22 (6.7) | |||
| Z | 20 (6.1) | 33 (10.0) | 27 (8.2) | 31 (9.4) | 34 (10.4) | ||||
| Downward louver angle | 36° | 45° | 36° | ||||||
| 14 (4.3) | X | 12 (3.7) | |||||||
| Y | 18 (5.5) | 16 (4.9) | 14 (4.3) | ||||||
| Z | 25 (7.6) | ||||||||
| Downward louver angle | 45° | ||||||||
*See Figure 1.
Dimensions
Figure 2 shows the top, rear, front, and side views of the unit, illustrating dimensions labeled A through J.
| Cabinet Size | Unit Size (kW) | Dimension (Inches (mm)) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| A | B | C | D | E | F | G* | H | J* | ||
| 1 | 3, 5, 7, 10 | 15-1/4 (388) | 23-11/32 (593) | 13-5/8 (347) | 14-11/32 (365) | 27-31/32 (711) | 20-7/8 (531) | 8-9/16 (217) | 25/32 (20) | 16-5/32 (411) |
| 2 | 15, 20, 25, 30 | 21-1/8 (537) | 28-5/32 (716) | 19-1/2 (496) | 19-11/32 (492) | 33-13/32 (849) | 24-3/4 (629) | 10-9/16 (268) | 21-7/32 (539) | |
*Heater suspension points (3/8-16 FEM).
Weights
| Unit Size (kW) | 3 | 5 | 7 | 10 | 15 | 20 | 25 | 30 |
|---|---|---|---|---|---|---|---|---|
| Pounds (kg) | 49 (23) | 50 (23.5) | 51 (24) | 53 (25) | 82 (38) | 92 (42) | 97 (44) | 101 (46) |
Clearances
DANGER: Keep combustible materials like furniture, pillows, bedding, papers, clothes, and curtains at least 36 inches (915 mm) away from the front of the heater.
The unit must be located to provide the clearances listed in Table 4 for inspection, service, and spacing from combustible construction. Clearance to combustibles is the minimum distance from the heater to a surface or object where the surface temperature should not exceed 90°F (50°C) above ambient temperature. Refer to Table 2 and Figure 2 for dimensions when determining clearances.
| Heater Surface | Minimum Clearance (Inches (mm)) |
|---|---|
| Top | 1 (25) |
| Access panel | 21 (533) |
| Non-access side | 1 (25) |
| Bottom* | 1 (25) |
| Rear (from fan motor) | 18 (457) |
*Suspend the heater so that the bottom is a minimum of 6 feet (1.8 meters) above the floor.
Installation
Unpacking and Inspection
The unit was test-operated and inspected at the factory. If damage occurred during shipment, document it with the transporting agency and contact an authorized Factory Distributor. Authorized Distributors should follow FOB freight policy procedures.
Pre-Installation Checklist
- Check the rating plate for electrical characteristics compatibility with the site's electric supply.
- Read this manual and familiarize yourself with installation requirements. Consult local agencies for specific requirements if needed.
- Prepare necessary supplies, tools, and manpower before starting.
- Check for any field-installed options (Table 5) that need assembly/installation prior to unit installation. Ensure all ordered options are present. Instructions are in this manual or in the option package.
- Verify the wall-mounting bracket (shipped with the unit) and required field-supplied hardware are available if mounting on a wall.
Table 5. Field-Installed Options
| Option | Description |
|---|---|
| CK8 | Adapts 3/8-inch hangers for two-point suspension from 1-inch threaded pipe |
| CK22 | Angle brackets for low ceiling mounting (does not include hanger rods) |
| CL1 | Single-stage thermostat |
| CL22 | Two-stage thermostat |
| CL31, CL32 | Multiple unit control: CL31 for one control unit and one additional unit; CL32 for each additional non-control unit. |
| CL90 | BACnet-capable thermostat |
| CM1 | Locking cover for CL1 thermostat |
| CM1B | Locking cover for CL22 thermostat |
| CM3 | Bracket assembly for mounting thermostat on unit |
| CN3F | Remote ON/OFF switch in 2 x 4 box |
| IT13 | Unit-mounted thermostat |
Heater Suspension
WARNING: Before suspending, verify the supporting structure has sufficient load-carrying capacity (refer to Weights section). DO NOT add additional weight to a suspended unit.
CAUTION: When lifting for suspension, support the bottom of the heater with plywood or other appropriate material to prevent damage.
The heater is designed for two-point suspension using 3/8-inch threaded rods, a hanger kit option package, or the wall-mounting bracket. A 3/8-16 threaded nut retainer is located at each suspension point.
Suspension of Heater Using Option CK8 Two-Point Suspension Kit
Option CK8 allows suspension using two swivel connectors attached to a 1-inch pipe. Attach swivel connectors to the 3/8-16 threaded nut retainers. Ensure swivel connectors are locked to the heater as shown in Figure 3.
Figure 3. Option CK8 Two-Point Suspension Kit
Diagram shows a heater with suspension points and swivel connectors attached to a pipe.
Suspension of Heater Using Field-Supplied Threaded Rods
The heater can be suspended using 3/8-inch threaded rods via two-point suspension. The maximum recommended rod length is 6 feet (1.8 meters). The threaded rod extending into the heater must NOT exceed 1/2 inch (13 mm). Ensure rods are locked to the heater as shown in Figure 4.
Figure 4. Heater Suspension Using Field-Supplied Threaded Rods
Diagram illustrates adding a 3/8-inch nut and washer to lock a 3/8-inch threaded rod to the heater.
Suspension of Heater Using Wall-Mounting Bracket
Secure the wall-mounting bracket (shipped with the heater) as shown in Figure 5. The bracket attaches to the heater's 3/8-16 threaded nut retainers using field-supplied 1- to 2-inch-long 3/8-16 bolts. Secure the mounting bracket to the wall using field-supplied hardware.
Figure 5. Heater Suspension Using Wall-Mounting Bracket
Diagram shows the wall-mounting bracket being attached to the heater and then to a wall.
Suspension of Heater Using Option CK22 Ceiling Suspension Kit
Option CK22 allows installation 1 inch from the ceiling without hanger rods. Refer to the kit's installation instructions.
Electrical Connections
CAUTION:
- Ensure all wiring complies with the unit's wiring diagram (Appendix: Wiring Diagrams).
- All electrical wiring and connections, including grounding, MUST comply with the National Electric Code (ANSI/NFPA No. 70, latest edition) or the Canadian Electric Code (Part 1, CSA C.22.1, latest edition). Be aware of any applicable local ordinances.
- All external wiring must be within approved conduit with a minimum temperature rise rating of 140°F (60°C). Conduit must not interfere with the heater access panel.
Supply Wiring Connection
- Check the heater's rating plate for supply voltage and current requirements. A dedicated line voltage supply with a disconnect switch should run directly from the main electrical panel to the heater.
NOTE: IMPORTANT (BEFORE CONNECTING THE SUPPLY WIRING): Determine if units with option AK6E or AK44 require field-modification of the transformer or contactor wiring.
- If required, modify transformer or contactor wiring as follows:
- a. Units with voltage option AK6E are factory-wired for 240V supply. Field-modification is required for 208V applications. Refer to the wiring diagram to change the white transformer wire from the 240 terminal to the 208 terminal.
- b. Units 3–10 with voltage option AK44 are factory-wired for 208V/240V/1Ph supply. Field-modification is required for 3Ph applications. Refer to the wiring diagram to change the black contactor wires: (1) Loosen terminal screws T1, T2, and T3 on the 3-pole contactor. (2) Disconnect black wires from T1 and T2 terminals and connect them to the T3 terminal. (3) Tighten all terminal screws.
Figure 6. Typical Control Panels
Diagrams show typical control panels for 10kW, 480V and 20kW, 240V units, illustrating components like pressure switch, limit switch, contactors, transformer, terminal block, and relays.
Control Connections
The 24V control connections terminal strip is located on the back of the unit. It has terminals C, R, G, W1, and W2. Thermostat connections use C (optional), R, G, W1, and W2 (optional) terminals. If a heater and an H series Huracan™ destratification fan are controlled by a single two-stage thermostat, ensure wiring matches the diagram in Figure 8.
Figure 7. Supply Wiring Entrance and Control Connection Terminal Strip
Diagram shows the supply wiring entrance and the terminal strip on the unit.
Figure 8. Heater and Destratification Fan Wiring Diagram
Diagram illustrates the wiring connections between a heater, a destratification fan, and a two-stage thermostat.
Controls
Disconnect Switch
A disconnect switch is optional (Table 5) or can be field-supplied. When installing, allow at least 4 feet (1.2 meters) of service room between the switch, service panels, and ensure conduit/housing are clear of service doors.
Fan Motor
The fan motor has automatic-reset thermal overload protection. If the motor doesn't run, check for improper voltage. Ensure correct voltage is supplied to the motor.
Thermostat
The unit can be controlled by an optional thermostat (Table 5) or a field-supplied 24V thermostat. Follow the thermostat manufacturer's instructions for installation, paying attention to location requirements. Connect the thermostat to the 24V control wiring terminal strip as per the unit's wiring diagram.
Air Proving Pressure Switch
WARNING: The automatic-reset air proving pressure switch will shut down the heater until the cause is corrected. Never bypass this switch, as hazardous conditions could result.
This switch senses fan operation pressure. It is factory-set and non-adjustable. If the setpoint is reached, it interrupts electric supply to heating elements, protecting against fan motor failure or restricted airflow.
High Temperature Limit Switch
WARNING: The automatic-reset high temperature limit switch will shut down the heater until the cause is corrected. Never bypass this switch, as hazardous conditions could result.
This temperature-activated, automatic-reset switch is factory-set and non-adjustable. If the setpoint is reached, it interrupts electric supply to heating elements, protecting against fan motor failure or restricted airflow.
Multiple Heater Control
If ordered with a multiple heater control option, one thermostat can control up to five heaters. Option CL31 includes a relay assembly for controlling two heaters. For more than two heaters (up to five total), option CL32 (relay assembly only) must be added to each additional heater. Option packages are shipped separately with full instructions.
Operation
Pre-Startup Checklist
Before startup, check the following:
- Ensure all screws securing shipping brackets have been re-installed in the heater cabinet.
- Verify suspension is secure and the unit is level.
- Confirm clearances from combustibles meet Table 4 requirements.
- Check electrical wiring: ensure wire gauges are as recommended, use a service disconnect switch, and verify fusing or circuit breakers are adequate.
- Check polarity: verify line voltage exists between all power wires and earth ground.
- Place the literature bag (containing warranty, manual, and option information) in an accessible location near the unit.
Startup
To start up the heater:
- Set the thermostat to the desired setting.
- Turn ON electric power to the heater.
- Observe the startup sequence (Table 6).
Table 6. Startup Sequence
| Condition | Action |
|---|---|
| Thermostat calls for heat | Terminal W energized, Fan energized, Air proving pressure switch closes |
| Steady heat | Heating elements energized |
| Thermostat is satisfied | Heating elements and fan remain energized, Heating elements de-energized, Fan de-energized when time delay is satisfied |
Maintenance
WARNING:
- Ensure the disconnect switch is OFF before servicing the unit.
- Wait until the housing and heating elements cool before performing maintenance.
- Eye protection is recommended when cleaning the unit.
CAUTION:
- When service is completed, ensure the unit is reassembled correctly to avoid unsafe conditions.
- If original wiring must be replaced, use wiring material with a temperature rating of at least 220°F (105°C).
- Ensure all wiring complies with the unit's wiring diagram.
- Use only factory-authorized replacement parts.
NOTE: For long life and satisfactory performance, inspect and clean the unit at the start of each heating season. More frequent maintenance is recommended in areas with unusual dust, soot, or impurities.
The unit is designed for minimum maintenance. Routine service is recommended for longevity and performance. Follow standard safety procedures and manual instructions during servicing.
Service Checklist
Perform the following annually:
- Clean dirt, lint, and grease from the fan blade, fan guard, and motor.
- Replace any parts that do not appear sound.
- Check for damaged wiring and replace as necessary.
Maintenance Procedures
Electrical Component Replacement
Use a voltmeter to verify 24V output from the transformer. If the transformer is not functioning, it must be replaced. Use only factory-authorized replacement parts for any electrical component replacement.
Fan and Motor Assembly Maintenance
Inspect and clean the motor, fan guard, and blades. Remove dirt and grease. Be careful not to cause misalignment or imbalance when cleaning fan blades. Ensure the fan blade hub is secure to the shaft. Replace the assembly if necessary, following these steps:
- Turn OFF electric power to the unit.
- Remove the access panel and disconnect fan motor wires, capacitor wires, and ground screw.
- Remove assembled parts (fan guard, motor, and fan blade).
- Disassemble and replace parts as needed.
- Reassemble using replacement and original parts.
- Ensure the fan is positioned correctly on the shaft (see Figure 9) and the setscrew is tightened according to Table 7.
- Position the assembly on the unit and secure the fan guard.
- Rotate the fan blade to check for adequate clearance. Adjust mounting screws, reposition the fan guard, and tighten screws to 30 inch-pounds if needed. Repeat until properly positioned.
- Reconnect fan motor wires per the wiring diagram.
- Install the access panel.
- Turn ON electric power to the unit and check for proper operation.
Figure 9. Fan and Motor Spacing
Diagram shows a motor with fan blade spacing dimension A.
| Unit Size (kW) | Dimension A* (Inches (mm)) | Setscrew Torque (Inch-Pounds ±10) |
|---|---|---|
| 3, 5 | 1 (25) | 80 |
| 7 | 1-1/16 (27) | |
| 10 | 1-1/2 (38) | |
| 15, 20 | 2-5/16 (59) | 120 |
| 25, 30 | 2-1/8 (54) |
*See Figure 9.
Troubleshooting
| Symptom | Probable Cause | Remedy |
|---|---|---|
| A. Unit will not start | 1. No power to unit | Turn ON power and check supply fuses or circuit breaker |
| 2. No 24V power to thermostat | Turn up thermostat | |
| 3. No power to fan motor | Check control transformer output | |
| 4. Defective fan motor | Tighten connections at motor terminals | |
| 5. Improper thermostat location or adjustment | Replace fan motor | |
| B. No heat (fan operating) | 1. Defective heating element | Refer to thermostat manufacturer's instructions |
| 2. Improper thermostat location or adjustment | Replace heating element | |
| C. Fan motor will not run | 1. Circuit open | Refer to thermostat manufacturer's instructions |
| 2. Defective capacitor | Check wiring and connections | |
| 3. Defective fan motor | Replace capacitor | |
| D. Fan motor cuts out on overload | 1. Low or high voltage supply | Replace fan motor |
| 2. Defective capacitor | Correct electric supply | |
| 3. Defective fan motor | Replace capacitor | |
| 4. Poor airflow | Replace fan motor | |
| Clean motor, fan, and fan guard | ||
| Adjust louvers |
Appendix: Wiring Diagrams
The following wiring diagrams are provided for reference:
- AK4 Wiring Diagram: Illustrates the electrical connections for the AK4 model.
- AK6E Wiring Diagram: Illustrates the electrical connections for the AK6E model.
- AK7E Wiring Diagram: Illustrates the electrical connections for the AK7E model.
- AK8E Wiring Diagram: Illustrates the electrical connections for the AK8E model.
- AK20 Wiring Diagram: Illustrates the electrical connections for the AK20 model.
- AK44 Wiring Diagram: Illustrates the electrical connections for the AK44 model.
Notes
This section is reserved for additional notes.
Installation Record
This section is to be completed by the installer for service or repair.
For service or repair, contact the installer. For additional assistance, contact the distributor. For more information, contact your local Reznor representative.
| Model | Serial No. | Date of Installation | Notes |
| Installer: Name Company Address Phone No. | Distributor: |
For more information on Reznor HVAC products:
- Contact your local Reznor representative at 1-800-695-1901
- Refer to the technical specifications, manuals, and consumer materials found at www.reznorhvac.com
Specifications and illustrations subject to change without notice or incurring obligations. Latest version of this manual is available at www.reznorhvac.com. ©2024 Reznor LLC, O'Fallon, MO. All rights reserved.
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