About Johnson Controls Johnson Controls, a global leader in thermal management, mission-critical building systems, energy efficiency, and decarbonization, helps customers use energy more productively, reduce carbon emissions, and operate with the precision and resilience required in rapidly expanding industries such as data centers, healthcare, pharmaceuticals, advanced manufacturing, and higher education.
For more than 140 years, Johnson Controls has delivered performance where it really matters. Backed by advanced technology, lifecycle services and an industry-leading field organization, we elevate customer performance, turn goals into real-world results and help move society forward.
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What you will doJohnson Controls is seeking a Senior Electrical Design Engineer! In this role, you will be responsible for electrical analysis, detailed design, controls integration, and overall electrical performance of Enviro-Tec HVAC equipment (air handlers, fan coils, blower coils). The focus spans on new-product development, sustaining engineering, prototyping, laboratory validation, certification support, and production enablement. You will lead complex electrical development efforts-covering wiring architecture, schematics, harnesses, component selection, motor/drive systems, sensors, protection devices, panel/enclosure layouts, electric heat integration, A2L refrigerant detection, and agency compliance-while providing technical leadership across NPD teams.
This position is onsite based in Largo, FL. Candidates must be commuting distance to the facility, or able to relocate. Johnson Controls offers various relocation packages depending on your needs.
How you will do it- Electrical Design & System Integration
- Define system electrical architecture, load analyses, and protective device coordination for AHU/FCU/BCU platforms.
- Design and review wiring schematics, interconnects, and harnesses; develop panel, enclosure, and junction layouts for manufacturability and serviceability.
- Integrate motors, VFDs/EC motors and controllers, sensors/actuators, and control interfaces (line- and low-voltage).
- Create and maintain electrical design standards, parts libraries, and specification documents; contribute selection rules for configurable/dynamic BOM generation.
- Compliance, Certification & A2L (UL 60335 / UL 1995)
- Interpret and implement UL 60335-2-40 and relevant UL/CSA/NEC requirements for electrical safety, wiring methods, creepage/clearance, component ratings, accessibility, and markings.
- Create and maintain agency listing report inputs for electrical/electronic/control components; generate test plans, evidence, and corrective actions.
- Lead coordination with Intertek/ETL and internal compliance teams for A2L refrigerant programs, including Refrigerant Detection Systems (RDS) integration, alarm thresholds, power and I/O, and Annex MM sensor-location confirmation support.
- Drive closure of agency non-conformances and report updates; translate evolving regulatory guidance into product requirements and instructions.
- Lab Validation, Prototypes & Field Performance
- Define electrical test criteria and validation plans with the Largo Test Lab (heater rack verification, limit/relay logic, drive/controller behavior, fault handling).
- Oversee prototype wiring builds and panel/enclosure fit-ups; verify harness routings, labeling, service access, and heat management.
- Analyze test data (current draw, temperature rise, EMI/functional behavior) and drive design updates to meet safety and performance requirements.
- Manufacturing, Sourcing & Cross-Functional Collaboration
- Provide production-ready electrical BOMs and routings; partner with manufacturing engineering on fixtures, work instructions, and DFMA improvements.
- Evaluate suppliers and qualify new electrical components (heaters, contactors, sensors, relays, power supplies, drives); support cost, lead-time, and obsolescence mitigation.
- Support marketing, applications, sales engineering, and service with electrical product guidance, installation considerations, and troubleshooting inputs.
- Generate clear drawings, wiring diagrams, block schematics, and installation/field wiring details in alignment with Largo drafting standards.
- Author Engineering Change Orders (ECO/ECR), support DFMEA/PFMEA and root-cause analyses, and implement corrective/preventive actions.
- Mentor designers/engineers and promote standard work, libraries, and reusable templates.
What we look forRequired- Bachelor's Degree in Electrical or Controls Engineering.
- 5+ years of electrical design engineering experience.
- Proficiency creating two-dimensional electrical schematics (e.g., AutoCAD) and experience with BOM databases.
- Working knowledge of NEC, UL 1995, and UL 60335-2-40 as applied to equipment wiring, protection devices, and accessibility.
Preferred- Hands-on prototype and lab testing experience (heater racks, controllers, motor/drive systems, safety limits).
- Familiarity with A2L refrigerant detection systems, wiring practices, and control responses; experience with Annex MM coordination
- Experience with configurable platforms and dynamic BOM logic.
- Cross-functional collaboration with compliance agencies (Intertek/ETL), manufacturing, sourcing, service, and field teams.
- 3D CAD exposure (SolidWorks).
HIRING SALARY RANGE: $100000 - $130,000 (Salary to be determined by the education, experience, knowledge, skills, and abilities of the applicant, internal equity, and alignment with market data.) This position includes a competitive benefits package. The posted salary range reflects the target compensation for this role. However, we recognize that exceptional candidates may bring unique skills and experiences that exceed the typical profile. If you believe your background warrants consideration beyond the stated range, we encourage you to apply. To support an efficient and fair hiring process, we may use technology assisted tools, including artificial intelligence (AI), to help identify and evaluate candidates. All hiring decisions are ultimately made by human reviewers. For details, please visit the About Us tab on the Johnson Controls Careers site at ;br>
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Johnson Controls International plc. is an equal employment opportunity and affirmative action employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, age, protected veteran status, genetic information, sexual orientation, gender identity, status as a qualified individual with a disability or any other characteristic protected by law. To view more information about your equal opportunity and non-discrimination rights as a candidate, visit EEO is the Law. If you are an individual with a disability and you require an accommodation during the application process, please visit here.
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