STN621 24V non-programmable heat pump room thermostat with digital LCD

Air Conditioner Thermostats HVAC Thermostat Heat Pump Thermostat Electric and Gas Thermostat Non-Programmable Thermostat

24V Heat Pump Digital Non-programmable Air Conditioner Room Thermostat for HVAC System

Name: 24V Heat Pump Digital Non-programmable Air Conditioner Room Thermostat for HVAC System
Brand: Smart Therm

STN621 is the non-programmable two stage heat pump thermostat in the STN600 platform, controlling 2 heat and 1 cool. It is specified for hotel work and covers air conditioning, heating, HVAC, ventilation and noise attenuation duties. Certification spans RoHS, CE, CCC and ISO, and project support includes graphic design and 3D model design for own-brand versions.

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Key Benefits

2 heat and 1 cool staging without a schedule to maintain
Ventilation function alongside heating and cooling control
RoHS, CE, CCC and ISO documentation from one part number
Battery or 24V power for both new build and retrofit
3D model design available for own-brand housing changes

Problems It Solves

Single stage stats leaving auxiliary heat uncontrolled
Ventilation handled by a separate switch
Separate SKUs for CE and CCC markets
Tooling cost blocking own-brand housing work

Who It Is For

Hotel operators on heat pump estates
HVAC contractors needing a two stage manual control
Exporters serving European and Chinese markets
OEM buyers wanting housing customisation

Technical Features

24V non-programmable control, 2 heat and 1 cool heat pump staging
Ventilation function
NTC sensor with digital LCD
Power supply battery or 24V
ABS housing in white
Rated for air conditioning, heating, HVAC, ventilation and noise attenuation duties
RoHS, CE, CCC and ISO documentation
1 year warranty with online technical support

Specifications

Model	STN621
Programmability	Non-programmable
Stages	2 Heat,1 Cool
Power Supply	Battery or 24V
Sensor	NTC
Screen	Digital LCD
Color	White
Material	ABS
Application	Hotel
Type	Air Conditioning/Heating/HVAC Systems/Noise and Attenuation/Ventilation/Other
Function	Ventilation
Feature	Energy Saving
Certification	RoHS CE CCC ISO
Warranty	1 Year Specification Stages 2 Heat,1 Cool
After-sale Service	Online technical support

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

Application Scenarios

Hotel rooms on heat pump plant with auxiliary heat
HVAC systems needing separate ventilation control
Buildings where the operator sets policy rather than a schedule
Export orders covering both CE and CCC markets

Quality Control

Both heating stages and the cooling stage exercised on the line
Ventilation output verified during the functional test
Documentation file maintained for RoHS, CE, CCC and ISO

Customisation Options

3D model design for housing changes
Graphic design for manuals and packaging
Front label, logo and housing colour
Staging defaults preset for the buyer's equipment

Comparison

How It Compares

STN601 single stage manual thermostat

STN621 adds a second heating stage, so auxiliary heat on a heat pump is controlled rather than left enabled.

Programmable heat pump stats

STN621 has no schedule, which is what hotel operators specify to keep guests out of the timings.

Use guide

Installing And Commissioning

Step 1

Isolate the 24V control circuit before removing the old stat

Step 2

Land the staging conductors on the marked terminals

Step 3

Fit batteries where no common wire exists, or hardwire at 24V

Step 4

Confirm the ventilation output is wired if the system uses it

Step 5

Call each heating stage and the cooling stage in turn

Answers