RET 230 HCW1 - Thermostat DANFOSS - Free user manual and instructions

Brand	Danfoss
Model	RET 230 HCW1
Product type	Thermostat for 2-pipe heating/cooling system with fan coil evaporator
Power supply	230 V~ ± 15%, 50/60 Hz
Temperature range (heating)	5 °C to 30 °C
Heating/cooling changeover	Automatic: >30 °C (cooling to heating), <16 °C (heating to cooling)
Relay outputs	2 x SPST, 3(1) A, 10-230 V~, type 1B
Dimensions (W x H x D)	110 x 90 x 40 mm
Temperature accuracy	±1 °C
Standards	EN 60730-2-9
Functions	On/Off or time-proportional mode (3 or 6 cycles/hour), Celsius/Fahrenheit selection, range locking/limitation, microprocessor reset
Installation	By qualified electrician, height 1.5 m, away from drafts and heat sources
Maintenance	Clean with a soft, dry cloth
Safety	Compliance with IEEE wiring regulations, rated impulse voltage 2.5 kV, ball pressure test 75 °C
Adjustment options	DRC switches for mode and cycle number selection
Pipe sensor	Mounted on the flow pipe, necessary for automatic changeover
Locking and limitation	Possibility to lock or limit the adjustment range using blocking springs

Frequently Asked Questions - RET 230 HCW1 DANFOSS

How to install the RET 230 HCW1 thermostat?

Installation must be carried out by a qualified electrician. Remove the wall plate, fix it at approximately 1.5 m from the floor, away from drafts and heat sources. Attach the pipe sensor to the flow pipe using the supplied clamp. Connect the terminals according to the diagram: L-COM for 230 V outputs. Remount the thermostat on the wall bracket.

How does automatic heating/cooling changeover work?

The thermostat measures the flow pipe temperature. If it exceeds 30 °C, it switches to heating mode. If it is below 16 °C, it switches to cooling mode. This changeover is automatic.

How to adjust the number of cycles per hour?

Use DRC switch No. 3 on the back of the thermostat. In the CHRONO 3 position, you get 3 cycles of 20 minutes. In the CHRONO 6 position, you get 6 cycles of 10 minutes. Switch No. 4 must be in the Chrono position.

How to switch from Celsius to Fahrenheit scale?

Toggle DRC switch No. 2 on the back of the thermostat. In the °C position, the display is in Celsius; in the °F position, it is in Fahrenheit.

How to lock or limit the temperature adjustment range?

Turn the dial to 3, remove the knob, place the blocking springs on the back of the dial at the desired position, then reassemble the knob by aligning the number 3 with the mark.

What to do in case of thermostat malfunction?

First check the power supply and connections. If necessary, reset the microprocessor with a non-metallic object (e.g., matchstick) by pressing the recessed button under the dial.

Can I use this thermostat with a 2-pipe system?

Yes, the RET 230 HCW1 is specifically designed for 2-pipe systems with fan coil evaporator. It controls a motorized valve according to heating or cooling mode.

How to clean the thermostat?

Use a soft, dry cloth to clean the housing. Never use abrasive products or solvents.

What safety precautions should be observed?

Installation must comply with applicable IEEE wiring regulations. The product must be installed by a professional. Observe the rated impulse voltage of 2.5 kV and the ball pressure test of 75 °C.

Where to place the pipe sensor?

Attach the sensor to the flow pipe using the supplied clamp. Ensure water circulates continuously in the circuit where the sensor is located; a bypass valve may be necessary.

USER MANUAL RET 230 HCW1 DANFOSS

Electronic Heat / Cool thermostat with auto-changeover based on water temperature

Installation Instructions User Instructions

Installation Instructions 3-9
User Instructions 10

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

Thermostat features
Temperature range, heating 5-30°C
Water changeover temp - Cool to Heat - Heat to Cool	>30°C <16°C
Thermostat off/auto & fan on selector	●
Power supply 230 Vac ± 15%, 50/60Hz
Relay outputs, heat/cool & fan 2 x	SPST, 3(1)A, 10-230 Vac, Type 1B
Dimensions (mm) 110 wide x 90 high x 40 high
Design standard EN60730-2-9
Rated impulse voltage 2.5Kv
Ball hardness test 75°C
Control pollution situation Degree 2
Temperature accuracy ±1°C

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^ the thermostat operates as a heating thermostat, if the flow temperature is less than 16^ 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 offi ce 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-fi tting 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.

DIL Switch descriptions

Switch 4: If set to On/Off, both heating and cooling operates in on/off mode. If set to Chrono, both heating and cooling operates in chrono-proportional 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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This product complies with the following EC Directives:

Electro-Magnetic Compatibility Directive.

(EMC) (89\336\EEC), (92\31\EEC)

Low Voltage Directive.

(LVD) (73\23\EEC), (93\68\EEC)

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