STN621 and STN721 non-programmable heat pump builder thermostat

Wired Thermostat 24V Wired Thermostat HVAC Thermostat Heat Pump Thermostat Electric and Gas Thermostat Non-Programmable Thermostat

Digital Smart Heat Pump 2Heat 1Cool Non-Programmable Wired Builder Thermostat

Name: Digital Smart Heat Pump 2Heat 1Cool Non-Programmable Wired Builder Thermostat
Brand: Smart Therm

STN621 and STN721 are the non-programmable heat pump models in the STN builder series, controlling 2 heat and 1 cool. They keep the second stage swing adjustment that limits auxiliary heat, the separate B and O terminals and the filter change indicator, but remove the schedule so there is nothing for an occupant to set beyond a temperature.

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Key Benefits

No schedule, which removes the main source of handover service calls
Second stage swing adjustment limits auxiliary heat running time
Separate B and O terminals for either reversing valve convention
Filter change indicator prompts the occupant at the right time
Builder series PP housing with white, blue or green backlight

Problems It Solves

Service calls caused by schedule confusion at handover
Auxiliary heat running longer than the building needs
Reversing valve wiring restricted to one convention
Filters left unchanged because nothing prompts the occupant

Who It Is For

House builders and developers
Housing associations and rental operators
Heat pump equipment suppliers
OEM buyers needing a non-programmable builder heat pump model

Technical Features

Heat pump control, 2 heat and 1 cool, non-programmable
Electric or gas configurable
Separate B and O terminals
Separate heating and cooling swing adjustments including second stage
Filter change indicator, selectable on or off
Power supply battery or 24V
White, blue or green backlight
PP housing, 400 g, supplied as one wired builder thermostat with one instruction sheet

Specifications

Model	STN621/STN721
Color	White/Blue/
Material	PP
Weight	400g
Package Included	1Wired Builder Thermostat 1Instruction

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

Application Scenarios

New build heat pump housing handed to first-time occupants
Rental apartments on heat pump systems
Buildings where the operator sets a fixed comfort policy
Heat pump systems with auxiliary electric heat

Quality Control

Both heating stages and the cooling stage exercised on the line
Second stage swing range verified during the functional test
Filter indicator checked before packing

Customisation Options

Backlight white, blue or green
Filter indicator interval preset to the buyer's specification
Swing defaults set for the buyer's heat pump equipment
Builder pack quantities and carton artwork

Comparison

How It Compares

STN625 and STN725

STN621 and STN721 remove the schedule from the same heat pump platform, which is what developers choose for handover units.

STN601 and STN701

This pair drives a heat pump with 2 heat and 1 cool, where STN601 and STN701 are conventional single stage.

Use guide

Installing And Commissioning

Step 1

Isolate the 24V control circuit before removing the existing control

Step 2

Land the conductors, using B or O as the reversing valve requires

Step 3

Select electric or gas configuration

Step 4

Set the second stage swing so auxiliary heat does not overrun

Step 5

Enable the filter change indicator and test both heating stages

Answers