WELL-20 · Wellness Electronics
Constant-Temperature Foot Spa Control PCBA Set
A representative mains-powered wet-environment architecture for controlled water heating, pump or massage loads, temperature and level supervision, isolated user controls, and independent protection against leakage, dry heating, and overtemperature.
Project context
How this product is typically engineered
A representative mains-powered wet-environment architecture for controlled water heating, pump or massage loads, temperature and level supervision, isolated user controls, and independent protection against leakage, dry heating, and overtemperature.
System architecture
Typical architecture
Protected mains input supplies an isolated low-voltage controller and separately switched heater, water-pump, air-pump, or vibration loads; temperature, water-level or flow, and independent thermal protection gate every operating state.
Engineering risks to resolve
Decisions to close before release
- Maintain insulation, creepage, grounding or double insulation, and moisture separation around mains power.
- Stop heating safely after low water, sensor failure, relay welding, leakage, or stalled circulation.
- Control load surge, relay heating, condensation, capillary water ingress, and service wiring errors.
Validation plan
Checks to define before production
- Use an interlocked isolated fixture for dielectric, insulation, leakage-current, polarity, power, and protective-earth checks where applicable.
- Test full and minimum water levels, temperature accuracy, dry heat, blocked pump, sensor fouling, relay-weld simulation, and independent cutoffs.
- Run cold-start, thermal, splash, condensation, drain-residue, load-combination, relay, and wet-environment endurance.
What to put in the RFQ
Files and records to agree before quoting
Use this list to agree the build inputs and release records for a similar product. The final set depends on the project.
Design baseline
Released schematic or block diagram, interface table, power states, critical constraints, and revision owner.
Manufacturing release
Gerber or ODB++, stack-up, centroid data, assembly drawings, approved DFM dispositions, and panel assumptions.
Material control
Released BOM revision, manufacturer part numbers, AVL or alternate rules, no-substitute lines, MSL handling, and exception approvals.
Validation record
Test method, acceptance criteria, sample or serial identity, measured result fields, and disposition. Example scope: Use an interlocked isolated fixture for dielectric, insulation, leakage-current, polarity, power, and protective-earth checks where applicable.
Production release
First-article status plus the agreed SPI, AOI, X-ray, ICT, FCT, programming, rework, OQA, labeling, and packing records.
During RFQ review, we confirm the required fields, sampling, limits, approvals, and record-retention period. Confidential project information stays within the agreed access rules.
Development and production controls
Typical manufacturing scope
- Isolated mains and multi-load switching.
- Water-temperature and level safety interlocks.
- Display, key, buzzer, and fault-state integration.
Technical image review
Board-level evidence
White-background views are published to make component placement, interfaces and assembly boundaries easier to inspect.
