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A failed walk-in compressor on a Friday night can cost a restaurant its entire inventory by Monday morning. A clogged condensate drain above a finished ceiling can cost a homeowner drywall, insulation, and flooring. In both cases the damage is done slowly and quietly, and in both cases a small alarm would have caught it hours earlier. Temperature and water alarms are inexpensive insurance against the failures nobody is around to see.
This category covers Supco cooler and freezer temperature alarms and water leak alarms, including Water Guard, the 24V condensate float and sensor shutdown device used on air handlers, furnaces with coils, and other equipment that makes water. Some products sound a local alarm, some interrupt the equipment's control circuit, and some do both.
Food service operators, convenience stores, florists, and labs use temperature alarms to protect product. HVAC contractors install water alarms and condensate shutdowns on attic and closet air handlers as standard practice, and homeowners add leak alarms near water heaters, washing machines, ice makers, and sump areas.
A temperature alarm monitors the space with an internal sensor or a remote probe and compares the reading to a set point. When the temperature crosses the high or low limit, the alarm sounds, flashes, or switches a contact that can trigger another device. Many models allow a delay so the alarm does not trip during normal defrost or door openings.
Leak alarms use a sensor that detects water bridging two contacts on the floor or in a pan. When water is detected, the unit sounds an audible alarm. These are typically battery-powered and can be placed anywhere water might collect.
Water Guard is wired into the low-voltage control circuit of HVAC equipment. When its float rises or its sensor detects water in the secondary drain pan or primary drain line, it opens the 24V circuit and stops the equipment from running. With the cooling call interrupted, the coil stops producing condensate and the overflow is stopped before it reaches the ceiling. When the water is cleared, the switch resets and the system can run again.
Choose a battery leak alarm with a loud audible signal for water heaters, washers, ice makers, and under-sink areas. Place it at the lowest point where water would collect.
| Alarm type | Where it goes | What it does on alarm | Key spec to check |
|---|---|---|---|
| Cooler temp alarm | Walk-in or reach-in cooler | Audible/visual alert, optional contact | High and low set point range, delay |
| Freezer temp alarm | Walk-in or reach-in freezer | Audible/visual alert, optional contact | Low-temperature range, remote probe |
| Water leak alarm | Floors near water heaters, washers, ice makers | Audible alert | Battery type, sensor placement |
| Water Guard float/sensor | Secondary pan or drain line on HVAC equipment | Opens 24V circuit to stop the system | Mounting style, 24V control circuit |
Supco has supplied the refrigeration, HVAC, and appliance trade since 1945, and its alarms and condensate safeties are a common part of service and install kits. HVAC365 shows specs and, where available, spec sheets and wiring information on each product page so you can pick the right alarm for the location. These items ship in 3-5 business days.
The most common locations are in the secondary drain pan under the air handler or in the primary drain line near the unit. Pick the mounting style designed for that location and follow the installation instructions. The goal is for the switch to trip before water overflows anything.
No. It stops the system to prevent water damage. You still need to clear the drain, check that the line is sloped and trapped correctly, and find out why it clogged.
If a condensate shutdown switch is installed, a full pan or blocked drain will stop the system. Check the secondary pan and the drain line. A qualified technician can clear the drain and confirm the switch resets.
Use an alarm with an adjustable delay, and set the high limit high enough above normal operation to ignore defrost but low enough to catch a real failure. Mounting the probe away from the evaporator discharge also helps.
Standalone alarms sound locally. Models with a contact output can be connected to an autodialer or monitoring system that sends notifications. Check the product specs for output options.
A pan catches small leaks but can overflow if the leak is large or the pan drain is blocked. A leak alarm in or next to the pan alerts you so you can shut off the water supply.
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