Danfoss RET230 Electronic Heat Cool Thermostat Instruction Manual
- June 17, 2024
- Danfoss
Table of Contents
Danfoss RET230 Electronic Heat Cool Thermostat Instruction Manual
Installation Instructions
Please note
This product should only be installed by a suitably qualified electrician or
heating installer.
The installation must comply with local Building Regulations and wiring
Regulations, including any competent person requirements that may exist
Specification
Product overview
The thermostat is designed for use in systems equipped with fan coils served
by a 2-pipe central changeover system.
The thermostat controls the operation of a motorized valve which, during
heating periods, opens when heat is required and which, during cooling
periods, opens when cooling is required.
The changeover from heating to cooling is achieved automatically by measuring the temperature of the flow pipe. If the flow temperature exceeds 30°C the thermostat operates as a heating thermostat, if the flow temperature is less than 16°C the thermostat operates as a cooling thermostat
Important note: It is essential that the circuit in which the pipe sensor
is located is not closed off and that water
circulates past the sensor at all times. This may require the fitting of a
bypass valve between system flow and return at the end of each circuit.
Installation
♦ First remove the wallplate from the back of the unit.
♦ Ensure that there is a minimum of 50mm above the unit and 100mm below the unit in order to mount the plug-in module.
♦ Fix at a height of approximately 1.5m from the floor, away from draughts or heat sources such a fan-coil outlets, sunlight or office equipment.
Pipe sensor location
♦ Fix the pipe sensor to the flow pipe using the clamping band supplied.
Important note: It is essential that the circuit in which the pipe sensor is located is not closed off and that water circulates past the sensor at all times when the system is in operation. This may require the fitting of a bypass valve between system flow and return to ensure circulation past the sensor.
Wiring
2-pipe fan coil application
Note:
If HEAT/COOL/FAN outputs are 230V, link terminals L-COM
Commissioning
Prior to re-fitting the thermostat to the wallplate, the DIL switches on the rear of the unit must be set to the desired setting.
DIL Switch options, shown in factory set position
(all switches in On position)
DIL Switch descriptions
Switch 4: If set to On/Off, both heating and cooling stages operate in
on/off mode. If set to Chrono, heating stage operates in chrono-proportional
modes, cooling continues in On/off mode
Switch 3: Active only if switch 4 is set to Chrono. This switch
determines the number of cycles per hour that the thermostat will impose on
the system, the options are three 20 minute cycles or six 10 minute cycles
Switch 2: Allows Celsius or Fahrenheit temperature scaling to be selected
Switch 1: Not used in this model
Mounting thermostat to the wallplate
- To mount the thermostat to the wallplate, align the tabs on the top of the thermostat with the apertures in the wallplate and hinge the thermostat down, pressing firmly to engage the securing clip in the wallplate.
Locking & limiting
- To lock or limit the setting range turn the setting dial to 3 and remove knob.
- Position the locking springs on the rear of the dial to the desired position and re-mount the knob ensuring that number 3 on the dial aligns with the reference mark on the case.
Note: Should it be necessary to reset the microprocessor for any reason, a reset button is located beneath the setting dial. Use a non-metallic point, for example a matchstick, to depress the recessed button.
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Part No 39052 Issue 05 05/06 SW REV 2.1
