Description - Basic Documentation - RDF302 - RDF302.B - RDF302/VB

Semi-flush mount room thermostats with RS485 Modbus communications RDF302, RDF302.B, RDF302/VB

Product Family
Product Group
Thermostats (temperature controller with sensor)
Content Language
English
Content Type
Technical Documentation > Basic Documentation
Product Version
Status
Valid
Date
2022-06-17
Document No
CE1P3079en
Download ID
A6V10350339
Stock No.
S55770-T238
S55770-T416
S55770-T428
Product No.
RDF302
RDF302.B
RDF302/VB
Access level
Internet
File Type
html

Comfort mode

The factory setting for the Comfort basic setpoint is 21 °C and can be changed in the thermostat’s EEPROM via parameter P08 or via Modbus with communication object "Comfort basic setpoint". The last intervention always wins.

The Comfort setpoint can be adjusted via the +/- buttons,
or via Modbus from a remote device like a touch panel or master unit, etc.
The last intervention always wins.

Temporary setpoint

If the “Temporary setpoint” function is enabled via parameter P69, the Comfort setpoint adjusted via the + / - buttons or via Modbus is set back to the Comfort basic setpoint stored in P08 when the operating mode changes.

Setpoint limitation

For energy saving purposes, the setpoint setting range can be limited to minimum (P09) and maximum (P10).

P09 < P10

  • If the minimum limit P09 is set lower than the maximum limit P10, both heating and cooling are adjustable between these 2 limits

P09 ≥ P10

  • For heating or cooling applications (e.g. 2-stage):
    – The setting range in cooling mode is from P09…40 °C in place of 5…40 °C
    – The setting range in heating mode is from 5…P10 °C in place of 5…40 °C

  • For heating and cooling applications (e.g. 4-pipe):
    – The cooling and heating setpoint are adjustable
    – The setting range in cooling mode is from P09…40 °C in place of 5…40 °C
    – The setting range in heating mode is from 5…P10 °C in place of 5…40 °C

Examples 2-pipe heating OR cooling 4-pipe heating AND cooling
P09 < P10

Cooling setpoint adjustable 18…25 °C

Heating setpoint adjustable 18…25 °C

Cooling setpoint adjustable 18…25 °C

Heating setpoint adjustable 18…25 °C

P09 ≥ P10

Cooling setpoint adjustable 25…40 °C

Heating setpoint adjustable 5…21 °C

Economy mode

Use control parameters P11 and P12 to adjust the Economy mode setpoints.

The heating setpoint is factory-set to 15 °C, and the cooling setpoint to 30 °C.

Protection mode

Use control parameters P65 and P66 to adjust the Protection mode setpoints.
The heating setpoint is factory-set to 8 °C (frost protection) and to OFF for cooling.

Caution

If a setpoint (Economy or Protection) is set to OFF, the thermostat does not control the room temperature in the corresponding mode (heating or cooling).

This means no protective heating or cooling function and thus risk of frost in heating mode or risk of over-temperature in cooling mode!

The Economy setpoints are accessible at the service level (P11, P12); the Protection setpoints at the expert level (P65, P66).