RET 230 HCW3 - Thermostat DANFOSS - Free user manual and instructions

Product Type	Thermostat for 2-pipe systems with forced-air evaporator
Brand	Danfoss
Model	RET 230 HCW3
Dimensions (L x H x D)	110 x 90 x 40 mm
Power supply	230 VAC ± 15%, 50/60 Hz
Temperature range (heating)	5 to 30 °C
Switching temperature (heating → cooling)	> 30 °C (flow temperature)
Switching temperature (cooling → heating)	< 16 °C (flow temperature)
Relay outputs	2 x SPST, 3(1)A, 10-230 VAC, type 1B
Temperature accuracy	± 1 °C
Manufacturing standards	EN 60730-2-9
Rated impulse voltage	2.5 kV
Ball pressure test	75 °C
Recycling level	Grade 2
Main functions	Motorized valve control, automatic heating/cooling switchover, manual fan speed selector, off/auto thermostat selector
DRC switches	On/Off (all or nothing) or Chrono (3 or 6 cycles per hour), Celsius/Fahrenheit
Installation	Recommended height 1.5 m from the floor, clearance of 50 mm above and 100 mm below, by a qualified electrician
Dial locking / limitation	Locking springs at the back of the knob
Maintenance and cleaning	Clean with a soft dry cloth; do not use abrasive products or solvents
Safety	Installation reserved for a qualified electrician; comply with applicable IEEE wiring regulations

Frequently Asked Questions - RET 230 HCW3 DANFOSS

How to install the RET 230 HCW3 thermostat?

First remove the wall plate. Attach it 1.5 m from the floor, with a clearance of 50 mm above and 100 mm below. Attach the pipe sensor to the flow pipe using the provided clamp. Ensure water is constantly circulating around the sensor (a bypass valve may be needed). Connect the wires according to the diagram and set the DRC switches before reassembling the thermostat.

How to switch from heating to cooling mode?

Switching is automatic: if the flow pipe temperature exceeds 30 °C, the thermostat operates in heating; if it is below 16 °C, it operates in cooling.

What is the adjustable temperature range?

The temperature range for heating is 5 to 30 °C. For cooling, the range is not explicitly stated, but the thermostat activates cooling mode when the flow temperature is below 16 °C.

How to configure the DRC switches on the back?

Before reassembling the thermostat, set the switches:
• Switch 4: On/Off (all or nothing mode) or Chrono (proportional mode for heating).
• Switch 3 (if switch 4 is on Chrono): 3 cycles of 20 min or 6 cycles of 10 min per hour.
• Switch 2: Celsius (°C) or Fahrenheit (°F) scale.
• Switch 1: not used.

What to do if the thermostat does not work correctly?

Try resetting the microprocessor: remove the dial knob and use a non-metallic object (e.g., a matchstick) to press the reset button recessed under the dial. Also check the wiring and DRC switches.

How to lock or limit the adjustment range?

Turn the dial to 3, remove the knob, then place the locking springs at the back of the dial in the desired position. Reassemble the knob aligning the number 3 with the mark on the housing.

What are the dimensions of the thermostat?

The dimensions are: width 110 mm, height 90 mm, depth 40 mm.

What is the required power supply?

The power supply is 230 VAC ± 15%, 50/60 Hz.

Is the thermostat compatible with cooling systems?

Yes, it controls heating and cooling via relay outputs. Switching between the two modes is automatic based on the flow pipe temperature.

How to clean the thermostat?

Use a soft dry cloth. Do not use abrasive products, solvents, or liquid cleaners as they could damage the device.

USER MANUAL RET 230 HCW3 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
Manual fan speed selector	●
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.

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.

Sw On

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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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)

CE