Categories: Lennox

LENNOX EHA150 Electric Heat Kits Instruction Manual

LENNOX EHA150 Electric Heat Kits Instruction Manual

Shipping and Packing List

Package 1 of 1 contains: 

2- Electric heat assemblies*
1- Electric heat control module (used on KC/KH only)
1- TB2 terminal block

Electric heat pigtails (quantity varies by model)

1- Bag assembly containing:
Wiring diagram stickers (qty. 1, 2, 3, or 4) 20- Screws

1- Box assembly containing (used on KC/KH units
without hinges only):
2- Electric heat door frames
2- Electric heat doors
4- Door hinges

When replacing an existing electric heat assembly of the same size, it is not necessary to replace the rest of the parts found in this kit.

Inspect package upon receiving. If damage is found, contact last carrier immediately.

F4 Fuse Block 

Fuse block assembly (F4) is furnished with the unit. The fuse block is required in single point power installations only.

Terminal Block 

TB2 in this kit replaces any factory-installed TB2. TB2 in this kit also replaces any factory-installed S48 or CB10 larger than 80amp.

Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a licensed professional HVAC installer or equivalent, service agency, or the gas supplier

As with any mechanical equipment, contact with sharp sheet metal edges can result in personal injury. Take care while handling this equipment and wear gloves and protective clothing.


EHA150, 156, 240 & 360 electric heat sections are used as primary heaters for packaged cooling units and as a secondary heat source for packaged heat pump units. See table 2 for match-ups. Two electric heat assemblies are used in 156 through 360 units.


The EHA 60 Hz series heaters are CSA and ETL design certified. The EHA 50 Hz series heaters are CE compliant.

Installation of electric heaters must conform with standards of the National Fire Protection Association (NFPA) “Standard for Installation of Air Conditioning and Ventilation Systems NFPA No. 90A;” “Standard for the Installation of Residence Type Warm Air Heating and Air Conditioning Systems NFPA No. 90B;” in Canada, CSA C22.1 Canadian Electrical Code — Part I and all applicable CSA requirements; manufacturer’s installation instructions and local municipal building codes. Heaters are approved for clearances to combustible materials as listed on heater rating plate.

Accessibility and service clearances must take precedence over fire protection clearances. All wiring must conform with local building codes and the current
National Electric Code (NEC) ANSI-C1 and in Canada, CSA C22.1 Canadian Electrical Code —Part I and the applicable CSA requirements.


  1. Disconnect all power to unit.
  2. Remove or open unit heat and compressor access panels. Remove screws and discard rectangular vestibule covers. See unit installation instruction dimension page.
  3. LC/KC/KH156 Units – Knock down two tabs in unit heat sections. See figure 1.
  4. Insert electric element heat assembly into rectangular vestibule opening and secure assembly using screws provided. See figure 1.
  5. KC/KH Units Only – Install electric heat control module in control area as shown in figure 2. Secure with #8 thread forming screws (provided).
  6. Units Without CB10 or S48 Only – Replace the unit terminal block TB2 with the terminal block provided in kit.
  7. Place appropriate electric heat wiring diagram on the inner side of compressor access panel. One, two, three, or four diagrams are provided with each kit.

See table 1 to determine which diagram to use.


Unit Diagram
LCH Energence listed in title block. LCH units will be equipped with either an M2 or M3 Unit Controller. M2 or M3 will be printed on the bottom of the Unit Controller near the SBUS connector. On units equipped with an M2 Unit Controller, use the diagram which does NOT have A178 in the key list. On units equipped with an M3 Unit Controller, use the diagram which has A178 in the key list.
LCM Has A178 in key list; no unit name or model number in title block.


Packaged Units Catalog No./ Part No. Unit Voltage Figure Electric Heat KW Output
156-300S (13-25 Ton) 22H66 / 604503-45 208/230 6 EHA240-7.5 and EHA240S-7.5



22H67 / 604503-46 460 6
22V35 / 604503-61 600 6
67W96 / 604503-33 380 6 EHA240-5.7 and EHA240S-5.7 11.5
156 (13 Ton) 22H68 / 604503-47 208/230 7 EHA156-15 and EHA156S-15 30
22H69 / 604503-48 460 6
22V36 / 604503-62 600 6
67W97 / 604503-34 380 6 EHA156-11.5 and EHA156S-11.5 23
180-360 (15-30 Ton) 22H70 / 604503-49 208/230 7 EHA360-15 and EHA360S-15 30
22H71 / 604503-50 460 6
22V37 / 604503-63 600 6
67W98 / 604503-35 380 6 EHA360-11.5 and EHA360S-11.5 23
LC 156 (13 Ton) 22H72 / 604503-51 208/230 8 EHA156-22.5 (2) 45
22H73 / 604503-52 460 8
22V38 / 604503-64 600 8
67W99 / 604503-36 380 8 EHA156-17.2 (2) 34.5
180-360 (15-30 Ton) 22H74 / 604503-53 208/230 8 EHA360-22.5 (2)



22H75 / 604503-54 460 8
22V39 / 604503-65 600 8
68W00 / 604503-37 380 8 EHA360-17.2 (2) 34.5
LC 156 (13 Ton) 22H76 / 604503-55 208/230 8


EHA156-30 (2)



22H77 / 604503-56 460 8
22V40 / 604503-66 600 8
68W01 / 604503-38 380 8 EHA156-23 (2) 45.9
180-360 (15-30 Ton) 22H78 / 604503-57 208/230 8 EHA150-30 (2) 60
22H79 / 604503-58 460 8
22V41 / 604503-67 600 8
68W02 / 604503-39 380 8 EHA150-23 (2) 45.9
210-360 (17.5-30 Ton) 22H80 / 604503-59 208/230 8 EHA360-45 (2) 90
22H81 / 604503-60 460 8
22V42 / 604503-68 600 8
68W03 / 604503-40 380 8 EHA360-34.5 (2) 68.9
300-360 (25-30 Ton) 73W98 / 604503-41 208/230 8 EHA150-60 (2)



73W99 / 604503-42 460 8
74W00 / 604503-43 600 8
74W01 / 604503-44 380 8 EHA150-45.9 (2) 91.8

(2) Two electric heat assemblies.

Electrical Connections

Wiring must conform to local codes and NEC/CEC. Refer closely to wiring diagram in this instruction and the following information: If electric heat assembly is being installed in an existing unit, a change in power supply wiring and disconnect switch or circuit breaker may be required. Remove the original supply wires or disconnect at power source. Refer to heater nameplate for minimum circuit ampacity and maximum fuse size.

 Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch(es). Unit may have multiple power supplies

KC/KH Units Control Wiring 

Refer to figure 2.

Note – Install electric heat control module before making wire connections. See Installation section.

  1. onnect wire from electric heat control assembly marked GND to grounding tab.
  2. Connect wire marked “TB13-L2” to “L2” of TB13 terminal block.
  3. Connect wire marked “TB13-L3” to “L3” of TB13 terminal block.
  4. Remove the jumper plug from J2; connect J2 to P2 plug located near J2.
  5. Route wires marked “P7” and “P37” to the location shown in figure 2 and secure harness with wire ties provided.
  6. Connect wires marked “J7” and “J37” in electric heat assemblies to pigtail wires marked “P7” and “P37” from kit harness.

LC Units Control Wiring 

Refer to figure 3 or 4.

  1. Locate and disconnect J7 and J37 jumper plug from harness. See figure 3.
  2. Cut wire ties that bundle P7 and J37 harnesses; do not damage wires.
  3. Route P37 to the right heat section as shown in figure 3 or 4.
  4. Connect electric heat assembly wires marked “J7” and “J37” to pigtail wires marked “P7” and “P37”.

Power Wiring 

  1. Review heater installed nameplate for MCA values and enlarge power entry knockouts as needed.
  2. Connect electric heat power wiring to unit terminal block TB2 as shown in figure 5. Also see figure 6, 7, or 8 depending on the options included on the electric heat assembly.
  3. Route the other side of the electric heat power wiring through the bottom of the disconnect box and the side of the electric heat compartment. Connect power wiring to electric heat fuse block F3 or electric heat terminal block TB3. See figure 4.

Electric Heat Door Assembly

KC/KH Units With Non-Hinged Access Doors Only 

  1. Install electric heat door assembly after electric heat assembly and wiring is completed.
  2. Remove the front middle and right side mullions as shown in figure 9.
  3. Remove the screw installed in the upper left corner of the left electric heat section. Position electric heat door assemblies in the electric heat openings as shown in figure 10. Make sure the doors open in the directions indicated.
  4. Secure each door from the inside of the compartment as shown in figure 10. Secure with #10 sheet metal screws provided. Replace the screw which was removed in the previous step.
  5. Make sure the hinged doors open and close properly. Adjust hinges if necessary.

Set Unit Controller – LC Units

Set the Unit Controller using one of the following menus. M2, M3, or M4 is printed near the bottom of the Unit Controller by the SBUS connector on LCH units and near the seven-segment display on LCM units. Refer to the Unit Controller manual provided with each rooftop unit.

M2 Unit Controller 

Use this menu to enable the appropriate number of electric heat stages.

M3 Unit Controller 

The Unit Controller configuration I.D. must be set to identify that electric heat has been installed.
Note – The number of electric heat stages do not have to be entered with version 08 and later.

  1. Use the Unit Controller keypad to enter the following menu:
  2. Press SAVE until CONFIGURATION ID 2 appears. Change the 9th digit to specify the electric heat installed as follows:
    N = No electric heat
    E = 15 kW
    J = 30 kW
    K = 45 kW
    L = 60 kW
    P = 90 kW
    S = 120 kW
  3. Press SAVE. The Unit Controller is now set up to operate electric heat.

M4 Unit Controller 

Use the following menu in the mobile app to enable electric heat.

Select configuration I.D. 2 and change (9) Field Electric Heat to Y (Installed).

Heating Operation

Cooling Units:

Single Stage (15 & 30 KW)
A W1 thermostat demand will energize the first stage of electric heat.

Two Stage (45, 60, 90 & 120 KW)
A W1 thermostat demand will energize the first stage of electric heat. A W2 thermostat demand will energize the second stage of electric heat after a 30 second delay.

Heat Pump Units:

A W1 thermostat demand will energize both compressors in heating mode (reversing valves are not energized). A W2 thermostat demand will energize the first stage of electric heat in addition to compressors operating in heat pump mode. For 45 through 90KW electric heat, the second stage of electric heat will be energized after a 30-second delay.

Unit Start-Up (Heating Cycle)

Set room thermostat for proper heat or auto operation if switching subbase is used. Apply power to unit and position heat setpoint lever above room temperature. Refer to unit installation instructions for additional information on start-up operations and adjustments.

Documents / Resources

LENNOX EHA150 Electric Heat Kits [pdf] Instruction Manual
EHA150, Electric Heat Kits, EHA150 Electric Heat Kits

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