SONOFF TRVZB

Compatibility

Compatible with EpiSensor Edge over Zigbee.

Pair it with the Zigbee radio on an EpiSensor Gateway. Edge reads it locally on the Gateway.

Edge reads 31 values from it, listed under Interface.

Connect it with

• 
  Gateway ZGW-20
  From €899 ex VAT Configure Gateway

Specifications

The TRVZB is a motorised head that replaces the thermostatic or manual head on a radiator valve. It screws straight onto an M30 × 1.5 mm valve body, and SONOFF lists adapters for Danfoss RA, RAV and RAVL bodies, M28 threads and Caleffi and Giacomini clamp fittings. It measures temperature at the head, drives the valve pin to hold a setpoint between 4 and 35 °C, and reports over Zigbee 3.0.^1, 2

Power

Battery. Three 1.5 V AA alkaline cells, bought separately. SONOFF says ordinary cells generally last more than six months, and that 1.2 V rechargeable cells cannot sustain it.¹

Setpoint range

4 to 35 °C¹

Valve connection

M30 × 1.5 mm thread; adapters for other valve bodies¹

Wireless

Zigbee 3.0¹

Working temperature

0 to 60 °C¹

Working humidity

5 to 95 % RH, non-condensing¹

Dimensions

58.4 × 58.4 × 94 mm¹

Casing

PC, white¹

Open-window detection

Closes on a fall of more than 1.5 °C within 4.5 minutes¹

Temperature offset

-12.7 to 12.7 °C in 0.2 °C steps³

Weekly schedule

Up to 6 setpoint changes per day, 0.5 °C steps³

Where it is used

• Room-by-room setpoints and schedules for radiators in offices, schools and hotels, with frost protection in rooms that are closed.

  HVAC energy monitoring for commercial buildings

• Radiator circuits on a boiler, where each head’s running state shows which rooms are calling for heat.

  Boiler performance monitoring

• Rooms with draughty windows or frequent airing, where open-window detection stops the radiator heating the outdoors.

Interface

Readings and settings, with units and ranges where SONOFF publishes them. R readable, R·W readable and writable.

The battery level can take up to 24 hours to report after pairing.³

The valve opening and closing degree limits need firmware 1.1.4 or later. SONOFF advises 1.1.6 or later if the valve pin does not move on a particular valve.^1, 3

Smart temperature control switches the head to adaptive PID control. While it is on, the valve opening percentage and temperature accuracy settings are not used.³

Temperature accuracy sets the switching band from -0.2 to -1 °C. At the default of -1 °C and a 26 °C setpoint, the valve closes at 26 °C and reopens at 25 °C.³

Setup

1. Fit and calibrate the head

   Load three AA cells. When the installation icon stops flashing, screw the head onto the valve. Short-press the middle button: "Ad" flashes, and after about 5 seconds the display returns to the temperature, which means calibration is complete.¹

2. Open pairing in Edge

   In Edge, open pairing on the Gateway’s Zigbee network. The Gateway accepts new devices while pairing is open.

3. Put the valve into pairing mode

   In manual mode, turn the knob anticlockwise until the display shows OF, then press and hold the middle button for 3 seconds until the network icon flashes. The valve leaves pairing mode after 3 minutes if it has not joined.¹

4. Confirm the join

   Check that Edge identifies it as SONOFF TRVZB and shows the local temperature and setpoint.

5. Check one control

   Raise the setpoint above the room temperature and confirm the running state changes from idle to heat. Then set it back.³

Common questions

Does the TRVZB need a SONOFF hub to work with Edge?

No. SONOFF states it works with any Zigbee 3.0-compliant hub as well as its own. It joins the Zigbee radio on an EpiSensor Gateway, and Edge reads and sets it there without the eWeLink app.¹

Will it fit my radiator valve?

It screws directly onto M30 × 1.5 mm valve bodies. Other common bodies, including Danfoss RA, RAV and RAVL, need one of SONOFF’s adapters. Check the valve against SONOFF’s compatibility guide before ordering.^1, 2

How long do the batteries last?

SONOFF says ordinary AA alkaline cells generally last more than six months, depending on the cells and the conditions. Do not use 1.2 V rechargeable cells: three in series sit only just above the minimum operating voltage.¹

Why does it read warmer than the room?

It measures at the valve, close to the hot water. Set a calibration offset, or write a room temperature to its external temperature input and select the external sensor. With an external sensor, no offset is needed.^1, 3

Can I limit how far the valve opens?

Yes. On firmware 1.1.4 or later, the valve opening degree and closing degree can each be set from 0 to 100 %. The default is 100 % for both.³

What do the F codes on the display mean?

F0 is a temperature sensor fault, F1 slow valve movement, F2 and F3 an adjustment range that is too wide or too small, F4 flat batteries and F5 no valve detected. Check the fitting first for F1 to F3 and F5.¹