STN721 non-programmable 24 VAC heat pump thermostat with large display

Air Conditioner Thermostats HVAC Thermostat Heat Pump Thermostat Non-Programmable Thermostat

Non Programmable Heat Pump 24 VAC HVAC Air Conditioner Digital Thermostat

Name: Non Programmable Heat Pump 24 VAC HVAC Air Conditioner Digital Thermostat
Brand: Smart Therm

STN721 is the non-programmable heat pump thermostat in the STN700 platform, built around a 4.5 square inch display. There is no schedule at all: the occupant sets a temperature, the fan switch offers AUTO or ON, and the installer tunes the differential anywhere between 0.2 and 2.0 F. A low battery indicator appears below 2.7 V when there is no 24V supply.

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Key Benefits

4.5 square inch display, the largest in the STN700 platform
Differential adjustable from 0.2 to 2.0 F for tight or relaxed control
No schedule at all, which removes the main source of tenant call backs
AUTO or ON fan switch for continuous circulation
2 year warranty with optional onsite installation and training

Problems It Solves

Occupants mis-programming schedules they were never meant to touch
Fixed differentials causing overshoot or short cycling
Small displays that generate complaints in offices and hotels
Batteries failing silently in rooms without a 24V supply

Who It Is For

Facility managers on heat pump estates
Hotel operators
Installers correcting comfort complaints caused by cycle rate
OEM buyers wanting a large display non-programmable heat pump stat

Technical Features

Non-programmable heat pump control, 24 VAC (18 to 30 VAC), 50/60 Hz
Temperature range 32 F to 99 F (1 C to 40 C), setpoint range 44 F to 90 F (7 C to 32 C)
Display accuracy +/-1 F under 68 F
HEAT / OFF / COOL switch with differential adjustable from 0.2 to 2.0 F
Fan switch AUTO or ON
Load rating 1.0 amp per terminal, 1.5 amp maximum all terminals combined
Low battery indicator under 2.7 V, 2 x AAA 1.5V alkaline battery option
Wall mounted, 12 x 9.8 x 2.8 cm, 4.5 square inch display, backlight blue, green, white or orange

Specifications

Model	STN721
Programmability	Non-programmable Low battery indicator Under 2.7 V (without 24V power supply)
Stages	2 Heat / 1 Cool
System Switch	HEAT/OFF/COOL Differential 0.2 to 2.0℉
Switchable Voltage	24 VAC(18 to 30 VAC), 50/60 Hz 2*AAA 1.5V Alkaline batteries power
Load rating	1.0Amp per terminal, 1.5Amp maximum all terminals combined Fan Switch AUTO/ON
Temperature Range	32℉ to 99℉ (1℃ to 40℃)
Setpoint Range	44℉ to 90℉ (7℃ to 32℃)
Display accuracy	±1℉(under 68℉)
Differential	0.2 to 2.0℉
Backlight	Blue/Green/White/Orange
Dimension	12 x 9.8 x 2.8 CM
Installation	Wall mounted Dispaly 4.5 sq.Inch
Application	Office Building/Hotel/Home/Indoor
Warranty	2 years
After-sale Service	Online technical support, Onsite Installation, Onsite Training, Onsite Inspection, Free spare parts, Return and Replacement, NONE

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

Application Scenarios

Office buildings on heat pump plant with centrally set policy
Hotels where guests set a temperature and nothing else
Homes and indoor spaces needing a large readable display
Systems that short cycle on a fixed differential

Quality Control

Differential range verified from 0.2 to 2.0 F on batch samples
Display and backlight checked on every unit
Low battery threshold tested at 2.7 V

Customisation Options

Default differential preset for the buyer's equipment
Backlight blue, green, white or orange
Front label and logo to the buyer's artwork
Onsite installation, training and inspection on project orders

Comparison

How It Compares

STN721W WiFi version

STN721 is the unconnected version, which suits sites where remote access is not wanted or permitted.

Programmable heat pump stats

STN721 has no schedule, so there is nothing for an occupant to change beyond the setpoint.

Use guide

Installing And Commissioning

Step 1

Isolate the 24 VAC control circuit and record the wiring

Step 2

Check the combined terminal load stays within 1.5 amp

Step 3

Land the conductors and mount the unit at about 1.5 m

Step 4

Set the differential between 0.2 and 2.0 F to suit the plant

Step 5

Choose AUTO or ON for the fan and confirm both modes run

Answers