AESTHETIC FEATURES

• Digital crown temperature control user interface

• Bright Full Colour wide viewing angle Display

• Aesthetic Matching with leading manufacturer lighting keypads

• Customisation of finishes and custom digital crown using materials like carbon fibre, wood, leather, acrylics and

gold.

TECHNICAL FEATURES • Intuitive Digital Crown for simple control

• Full Colour IPS Capacitive Touch Screen

• Independently Control of two rooms for both heating and cooling

• Optional Towel Rail Control

• Optional Hot Water Control

• Centigrade & Fahrenheit with dynamic swap support

• External / Remote temperature probe inputs

• Minimum and Maximum floor temperature control

• Virtual Temperature interface with VRV & VRF

• Modbus Communications Interface

Digital Crown

The digital crown is the perfect user interface for controlling temperature. It is simple and universally understood. Turn the crown up to increase the room temperature (setpoint), turning it down to reduce the room temperature. If the new setting will cause the room to heat then the numbers will turn orange, if the new setting is going to trigger the cooling, the numbers turn blue. A further confirmation is then given to the user by the digital crown softly glowing either red or blue for a short period of time. The screen then displays an orange flame or blue snowflake symbol as confirmation on the main/home screen.

Additional functions available to the user are accessed by pressing the digital crown. Each press cycles from one feature to the other. If features are disabled in the settings they do not appear to the user, removing confusion. As default press once and the user can control the fan speed, OFF, AUTO, 1,2,34,5,6 (installer has the ability to change these values). Press again and the user has control over the temperature of zone 2 for both heating and cooling if available. Press again, and the user can control the towel radiator, OFF, AUTO or set a time in 5min increments, by simply turning up the dial.

Dual Zone / Dual Room

The Ursium is a dual zone thermostat allowing two rooms to be monitored and control heating and cooling completely independently. The second room is achieved by using a number of remote probes wired into the rear of the device. If the thermostat is installed in a single zone environment, then zone 2 can be disabled. When disabling zone 2 any symbols or pages are removed from the user’s interface.

Enabling Heating Only or Cooling Only

The Ursium by default is a Heating and Cooling thermostat controller. However, it can be configured as a ’Cooling only’ or ’Heating only’ device (per Zone). When these changes are set, any symbols or pages relevant to those features are removed from the user’s interface, eliminating confusion.

Humidity

As default, the thermostat has a built-in humidity sensor for zone 1. This humidity sensor can be enabled or disabled from the user display. Access to the Humidity readings is always available from the Modbus control interface.

Temperature Sensors & Averaging

Ursium can accept up to five remote probes wired into the back of the thermostat. These sensors should be 10k3 standard. The five probes are allocated as three to Zone 1 and two to Zone 2.

Zone 1 can use these additional sensors for room averaging or the internal sensor can be disabled allowing for a more flexible placement of the thermostat due to accessibility or aesthetics.

Each zone can use an individual probe for sensing floor temperatures.

The temperature readings available from the sensor probes can always be accessed over the Modbus communications allowing for the Ursium thermostat to be used as a mini temperature hub for rooms or areas that don’t have thermostats or sensing services such as temperature of AV equipment, flow and return pipes, Manifolds, etc...

Model Number	URS-ACM-NONE URS-FP1-ALI-ff	Single gang, electronics base unit only (with local AC control) Ursium / Lutron Alisse Single Gang Face Plate Kit including digital crown
Room Temperature Sensor	Centigrade or Fahrenheit With configurable display resolutions of 0.1, 0.5 & 1.0 °C/°F Accuracy ±0.5°C ±1°F Includes Virtual Temperature Support
Dead band support	0 – 8°C (in half degree increments) for heating 0 – 8°C (in half degree increments) for cooling Total dead band width 16 °C
Floor Temperature	Configurable Maximum Floor Temperature (for zone 1 & 2) Configurable Minimum Floor Temperature (for zone 1 & 2)
Remote Probes Zone Support	Two Room (Zone) Models Zone 1: Internal temperature & Humidity Sensor 3no. 10k3 remote probe inputs (2 x Wall & 1x Floor) Zone 2: 2no. 10k3 remote probe inputs (1 x Wall & 1x Floor) Zone 2 can be enabled or disabled Remote probe length: Max 10m / Min 1m
Heating Mode	Heating support can be enabled or disabled (per zone) Includes Optional Heating Modulation Support
Heat Boost Modes	3 stage heating option Stage 1: Primary heating source (Wet, Electric or Air) Stage 2: (boost) Secondary heating (Wet, Electric) Stage 3: (boost) Third Stage Heating (Warm Air) Each stage configurable with temperature separation
Cooling Mode	Cooling support can be enabled or disabled (per room) Direct to Indoor unit via driver support or indirect through Modbus registers
Operation Modes (opMode)	Each zone (room) has an independent opMode (OFF, AUTO, Away, Heating Only, Cooling Only) AWAY includes a configurable frost protection setback temperature.
Towel Radiator Control	Optional Control over Towel Radiator Demand, via direct override and/or Timer up to two towel radiator control (1per zone)
Hot Water Control	Optional Control over Hot Water Demand, via direct override or Timer
Eco Modes	Each Zone has independent Eco Mode that control the dead bands of the heating and cooling There are four ecoModes available for each zone (OFF, Low, Medium & High) each eco mode has configurable threshold levels.
Humidity Support	Between 15% & 85% RH humidity readings Accuracy ±5% RH
Setpoint Range	Adjustable setpoint between 5 & 36°C in 0.5 & 1.0 °C increments Allows for installer configurable setpoint limits
Scheduling / Timeclock	Built in RTC 7 x Room Pre-sets / profiles Zone:1 5/2 day timer with 4/4 timers Zone:2 5/2 day timer with 4/4 timers Towel Rail Timer 2 per day Hot Water Timer 2 per day
Power	IEC SELV/NEC® Class 2 18 – 28 V DC – 80mA (used for power supply & volt drop calculations) DC Power supplies used must have short circuit and overload protection
Typical Power Consumption	40mA / 1.0 W @ 24v DC Test conditions: All features enabled, with external probes fitted. Screen in dim mode.
Enclosure	IP20 Rating, indoor use only
Environment	Ambient operating temperature: -5 °C to 40 °C, (23 °F to 113 °F) 0% to 85% non-condensing relative humidity. Indoor use only.
Communications	SELV/PELV/NEC® Class 2 wiring connects thermostats to other devices on the Modbus link. Mode: RTU Framing (JBUS) Baud Rate: 9600, 19200, 57600 & 115200 Byte Format: 8N1 Modbus ID: 1 – 32 (range)
Air-Conditioner control (only on “ACM” Models)	For control of individual Air-Conditioners without a BMS Secondary Modbus: as above, with MASTER mode @ 9600bps Contact Polar Bear Design for the latest compatibility
Digital Inputs “ACM” Models	2 x Volt Free Digital inputs
ESD Protection	Meets IEC 801-2. To withstand 15 kV electrostatic discharge without damage or memory loss.
Memory	Internal EEPROM is rated for 100,000 writes (non-volatile configuration only)
Power Failure	Features marked as non-volatile are saved to internal EEPROM memory and will be restored after power is returned.
Mounting	See mounting details later in this document
Wiring	SELV/PELV/NEC® Class 2
Terminals	DC Power Terminal (x2pin) accepts 24AWG to 12 AWG wires Modbus Terminal (x3pin) accepts 28AWG to 16AWG wires Remote probes Terminal (x10pin) accepts 28AWG to 16AWG wires
Display	2.4 inch IPS TFT Screen 36.72(W) x 48.96 (H) mm Touch Screen version optional (262K) / Transmissive / Normally Black Life Time 50,000 hrs (@ 25 °C)
Warranty	https://www.polarbeardesign.co.uk/docs/warranty

Product Parts

Digital Crown

Face plate

Ursium base unit

Mounting Frame

User Interface

Website Access

Registration

Register to gain access to website resources such as datasheets, photography and installation schematics and cad files.

Registration approval will be required

Register

New Dealers

Registration

If you're interested in re-selling and installing our fantastic products, you will need to register as a dealer.

Someone from Polar Bear Design will contact you and arrange for a full dealer application to be issued

Registration

Alisse Thermostat, by Polar Bear Design

Digital Crown

Dual Zone / Dual Room

Enabling Heating Only or Cooling Only

Humidity

Temperature Sensors & Averaging

Product Parts

User Interface

Website Access

Registration

New Dealers

Registration

Looking to start your next project?