WiFi Smart Touchscreen Thermostat
STN855W is the connected touchscreen flagship: dual band WiFi on 2.4 GHz and 5.0 GHz, Alexa voice control, and universal staging up to 2 heat and 2 cool conventional or 3 heat and 2 cool heat pump. The schedule is editable rather than fixed, with programming segments that can be added or removed up to six, and the full set of operator controls including keypad lockout, setpoint limits and compressor delay.
Key Benefits
- Programming segments can be added or removed, up to six, rather than a fixed pattern
- Dual band WiFi on 2.4 GHz and 5.0 GHz with Alexa voice control
- Widest staging in the range across conventional and heat pump plant
- Auto changeover plus keypad lockout and setpoint limits
- Filter change indicator and selectable 5 minute compressor delay
Problems It Solves
- Fixed schedule patterns that waste energy in irregular buildings
- Connected stats that cannot join a 5 GHz network
- Several part numbers to cover mixed plant
- Remote users setting temperatures outside the plant's range
Who It Is For
- Smart home integrators on premium projects
- Facility managers on mixed equipment estates
- Hospitality developers specifying a touchscreen control
- OEM buyers needing the flagship connected model
Technical Features
- Universal WiFi on 2.4 GHz and 5.0 GHz, works with Alexa
- Up to 2 heat 2 cool conventional and up to 3 heat 2 cool heat pump
- 7 day, 5/1/1 programmable or non-programmable, with auto changeover
- Programming segments can be added or removed, up to 6 segments
- Temperature range 32 F to 99 F (1 C to 40 C), control range 44 F to 90 F (7 C to 32 C)
- Measurement accuracy +/-1 C at 20 C, room temperature calibration adjustment
- Keypad lockout, heating and cooling setpoint limits, filter change indicator
- 5 minute compressor delay protection, 24V power, 120 x 98 x 28 mm
Specifications
| Programmability | 7 Day, 5/1/1 Programmable or Non-programmable |
| Power Source | 24V |
| Temperature Range | 32˚F-99˚F (1°C-40°C) |
| Control Temp.Range | 44˚F-90˚F (7°C-32°C) |
| Temp.Meas.Accuracy | ±1°C (at 20°C) |
| Dimension | 120 x98 x28 mm |
Specifications are taken from the manufacturer data for this model. Confirm the exact configuration with us before you order.
Application Scenarios
- Buildings with irregular occupancy that a fixed pattern cannot follow
- Mixed conventional and heat pump estates managed remotely
- Sites running 5 GHz only wireless networks
- Premium residential and hospitality projects
Quality Control
- Touch panel response tested point by point on every unit
- Each unit joined to both a 2.4 GHz and a 5.0 GHz test network
- All staging outputs exercised across conventional and heat pump modes
Customisation Options
- App and voice skill branding on ODM projects
- Default segment count and setpoint limits preset at the factory
- Backlight white, blue or green
- Screen layout and icon set on ODM projects
How It Compares
Installing And Commissioning
Step 1
Land the conductors and confirm a 24V supply is available
Step 2
Select conventional or heat pump staging in the installer menu
Step 3
Join the thermostat to the 2.4 GHz or 5.0 GHz network
Step 4
Add or remove programming segments to match the building, up to six
Step 5
Set the setpoint limits, enable keypad lockout and link the Alexa account
WiFi Smart Touchscreen Thermostat: Buyer Questions
How flexible is the STN855W schedule?
Programming segments can be added or removed, up to six segments, rather than following a fixed pattern.
Which WiFi bands does it support?
2.4 GHz and 5.0 GHz.
How many stages does it control?
Up to 2 heat and 2 cool conventional, and up to 3 heat and 2 cool heat pump.
Can occupant adjustment be capped?
Yes, with keypad lockout and heating and cooling setpoint limits.
What are the dimensions?
120 x 98 x 28 mm.
Is a demonstration video available?
Yes. Message us on WhatsApp and we will send the STN855W video.
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