LW Series Feature Map

Felt-pad and exposed-metal sensors false-alarm in galvanized or aluminum drain pans. The metal pan itself completes the circuit, triggering a shutdown when there is no water present. This is the single most common callback complaint with traditional wet switches.

The LW probes are electrically isolated from the housing. Only water bridging the two probe tips completes the circuit. Metal pans cannot create a false path. Zero false alarms from pan material.

Traditional wet switches use a hydrophilic felt pad to wick water into the sensor array. Once saturated, these pads take 30-60+ minutes to dry, sometimes longer in humid environments. The system cannot be reset and the HVAC cannot restart until the pad is dry. In summer, this means the homeowner sits without AC.

The LW uses bare stainless-steel probes with no absorbent material. Once the water is removed, the probes dry in minutes. The contractor clears the drain, resets the unit, and the system is back online. Fewer callbacks, faster service.

Many wet switches carry only a 2A relay. This limits them to low-current thermostat interlock circuits. If a contractor needs to control a motorized valve, a condensate pump relay, or a higher-draw interlock, they need an external relay, adding cost, wiring, and failure points.

The LW's 5A SPDT relay handles thermostat interlocks, normally-open water valves, BMS dry contacts, and condensate pump shutoffs directly, no external relay needed. The Form C (SPDT) configuration gives the installer both normally-open and normally-closed contacts for maximum wiring flexibility.

Most HVAC systems supply 24V AC from the air handler transformer. But some installations -- water heater pans, standalone leak detection, BMS-integrated systems -- only have 24V DC available. A switch that only accepts AC limits where it can be installed.

The LW accepts either 24V AC or 24V DC. One SKU covers residential HVAC, commercial BMS tie-ins, water heater applications, and standalone monitoring, no transformer matching required.

Auto-resetting switches can silently restart the HVAC after the water recedes or evaporates, even if the root cause (clogged drain) is not fixed. The system runs, produces more condensate, and the pan fills again. The homeowner may not realize there is a recurring problem until real damage occurs.

The LW latches in alarm until someone physically presses the reset button. This forces a service visit. The drain gets cleared, the root cause is addressed, and the system only restarts when a human confirms it is safe. This is the safer design and matches code intent.

Plastic wet switch housings degrade under sustained UV exposure in attic installations and can crack in high-temperature plenum environments. If a pan fills completely, water ingress into unsealed electronics causes permanent failure.

The LW housing is machined aluminum with epoxy-potted electronics and silicone pre-seal. It is rated for 24-hour submersion. It survives full pan flooding, high attic temperatures, and years of service without housing degradation.

Code requires plenum-rated wiring in air-handling spaces. Switches shipped with standard PVC-jacketed wire cannot be legally installed in a plenum without the contractor re-wiring, adding time and liability.

The LW ships with 6 feet of plenum-rated cable. It is ready for plenum installation out of the box with no rewiring required.

Many condensate switches cannot be field-tested without introducing actual water into the pan. This makes it difficult for the installer to verify the interlock wiring is correct at the time of installation, and impossible for a service tech to test on a routine maintenance call without creating a mess.

The LW has a test button that simulates an alarm condition and switches the relay. The installer can verify the entire interlock circuit, relay, wiring, and equipment response, in seconds, without water.

On a service call, the tech needs to immediately know: is the switch powered? Is it in alarm? With no indication, the tech has to pull out a meter and start probing, wasting time.

The LW has a power LED (constant when energized) and an alarm LED (lit when water detected). A glance tells the tech the status. No meter needed for basic diagnostics.

Traditional wet switches shut down the HVAC silently. The homeowner comes home to a warm house and has no idea why. The contractor gets an emergency call instead of a scheduled service visit. There is no notification to anyone that the switch tripped.

The LW2 sends a push notification through the Smart Life app the moment water is detected. The homeowner knows immediately. The contractor can be notified. The emergency becomes a scheduled call. Compatible with Alexa, Google Home, and Apple Home through Smart Life.

In some installations (mechanical rooms, utility closets) the homeowner may not check their phone promptly. A silent shutdown means hours or days before anyone notices the AC is off.

The LW2 includes a local audible alarm. If the switch trips, the buzzer sounds at the unit location, alerting anyone nearby. This is a second layer of notification on top of WiFi.

IRC/IMC code sections M1411.3.1 and M1411.9.1 require water-level detection devices to conform to UL 508. A switch without this conformance is not a code-recognized solution, and an inspector can reject the installation.

The LW conforms to UL 508, making it a code-recognized water-level detection device under IRC Options 3 and 4 for auxiliary condensate overflow protection.

Most condensate switches in the market carry a 1-year warranty or no stated warranty. The switch is expected to protect the property for the life of the HVAC equipment: typically 15-20 years.

The LW carries a 3-year warranty, signaling confidence in long-term reliability and giving the contractor a stronger value proposition when selling the install to the homeowner.