STN725 24V LCD heat pump programmable room thermostat

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24V LCD Heat Pump Electronic Programmable Heating Air Conditioner Room Thermostat

Name: 24V LCD Heat Pump Electronic Programmable Heating Air Conditioner Room Thermostat
Brand: Smart Therm

STN725 is a 24V programmable room thermostat for heat pump and air conditioning systems, controlling 2 heat and 1 cool. It uses an Omron relay on the switching side and an NTC sensor for room measurement, and runs from batteries or 24V hardwired power at 18 to 30 VAC, 50/60 Hz. Load rating is 1 amp per terminal with 1.5 amp maximum across all terminals combined.

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Key Benefits

2 heat and 1 cool staging covers heat pumps with auxiliary heat
Omron relay gives a known contact specification rather than an unnamed part
Battery or 24V power keeps the unit usable in retrofits without a C wire
Rated for indoor and bathroom locations
1 year warranty with online technical support and replacement

Problems It Solves

Single stage stats leaving auxiliary heat uncontrolled
Unnamed relays making contact life impossible to predict
Stats not rated for humid bathroom locations
Retrofits blocked by the lack of a common wire

Who It Is For

Heat pump installers needing a two stage control
Underfloor heating suppliers covering bathroom zones
Distributors stocking a CE marked 24V programmable stat
OEM buyers who specify Omron relays

Technical Features

24V control with 2 heat and 1 cool stages
Temperature range 41 F to 95 F (5 C to 35 C)
Display accuracy +/-1 F
Load rating 1 amp per terminal, 1.5 amp maximum all terminals combined
Switchable voltage 18 to 30 VAC, NEC Class I, 50/60 Hz for hardwire
NTC sensor with Omron relay
Power supply battery or 24V
Anti-flammable PC and ABS housing, digital LCD, CE marked

Specifications

Model	STN725
Power Supply	Battery or 24V power
Switchable Voltage	18 to 30 VAC, NEC Class I, 50/60 Hz for hardwire (common wire)
Load rating	1 amp per terminal, 1.5 amp maximum all terminals combined
Temperature Range	41°F to 95°F (5°C to 35°C)
Display accuracy	±1°F
Sensor	NTC
Relay	Omron
Screen	Digital LCD
Material	Anti-flammable PC +ABS
Operating Humidity	90% non-condensing maximum
Application	Indoors/Bathroom
Type	Floor Heating Parts
Function	Temperature Control
Feature	Saving energy
Certification	CE
Warranty	1 Year
After-sale Service	Online technical support, Return and Replacement

Specifications are taken from the manufacturer data for this model. Confirm the exact configuration with us before you order.

Application Scenarios

Heat pump installations with electric backup heat
Bathrooms and wet rooms with underfloor heating
Apartments on air conditioning with a heating stage
Retrofits replacing a failed single stage stat

Quality Control

Omron relay switching verified at rated load on every unit
Both heating stages and the cooling stage exercised on the line
Samples audited for display accuracy against a reference

Customisation Options

Staging defaults preset for the buyer's equipment
Housing colour and logo marking
Instruction sheet in the buyer's language
Graphic design support for packaging

Comparison

How It Compares

STN2320 heat pump thermostat

STN725 is the 24V LCD variant with an Omron relay and a documented 1 amp per terminal load rating, which specifiers ask for on commercial work.

Single stage 24V stats

STN725 drives a second heating stage, so auxiliary heat is controlled rather than left permanently enabled.

Use guide

Installing And Commissioning

Step 1

Isolate the 24V control circuit and record the existing wiring

Step 2

Check the total terminal load stays within 1.5 amp combined

Step 3

Land the conductors on the colour coded terminals

Step 4

Fit batteries where no common wire exists, or hardwire at 18 to 30 VAC

Step 5

Run each heating stage and the cooling stage and confirm the plant responds

Answers