Danfoss Radiator Thermostat RAS-C2 Combi Pack / Radiator Pack

Installation of Valve

The valve is a bi-directional valve [*] and can be installed horizontally or vertically in either the flow or return pipe. A built-in flow direction selection feature can be used to eliminate the risk of water hammer. Danfoss recommends using a flat-faced adjustable spanner and a soft cloth to protect the chrome surfaces when tightening up the connections.

Troubleshooting

In the unlikely event of water hammer being encountered, turn the setting ring (see diagram 4) to the other setting. Alternatively, if commissioning the whole system, establish the flow direction through each valve using the diagrams below. If the flow direction needs to be changed, there is no need to remove the valve; simply turn the setting ring.

Installation Steps

1. Close all radiator valves by turning the valve cover cap clockwise. Leave the system to cool. Diagram 1: Shows a radiator valve cap being turned clockwise.
2. Start boiler/heating. Diagram 2: Shows a boiler icon with a flame, indicating heating is active.
3. Open one valve and determine flow direction. Observe which pipe heats first. Diagram 3: Shows a radiator with pipes, highlighting one pipe heating up to indicate flow direction.
4. Remove cap and turn setting ring according to the drawings - the setting ring is turned by hand only. Diagram 4: Shows a radiator valve with the cap removed, and a hand turning a 'setting ring'. Two states of the setting ring are illustrated.
5. Repeat step 3 and 4 until all valves have been set correctly. The sensor may now be fitted or the valve cap temporarily refitted. Diagram 5: Shows a radiator valve with the sensor being fitted.

Fitting the Sensor

1. Remove cap from valve and turn sensor to desired position. Diagram: Shows a valve cap being removed from the valve.
2. Make sure union nut is turned loosely up towards the sensor body until it is only slightly free of the lower part of the sensor body. Diagram: Shows the union nut being loosely attached to the sensor body.
3. Press the sensor firmly onto the valve.
   • Sensor horizontal: ensuring that the scale pointer is at the top.
   • Sensor vertical: ensuring that the scale pointer is at the front.
   Diagram: Shows the sensor being pressed firmly onto the valve, with indicators for horizontal (pointer at top) and vertical (pointer at front) orientation.
4. Whilst holding the sensor firmly on the valve, secure connection by turning union nut clockwise by hand. Diagram: Shows the union nut being hand-tightened.
5. Whilst still holding the sensor firmly on the valve, fully tighten grey union nut using parrot nose pliers. Diagram: Shows parrot nose pliers tightening the grey union nut.
6. Set desired room temperature. Diagram: Shows the sensor fitted and the desired temperature being set on the head.

Removing the Sensor

Turn union nut anti-clockwise to release locking mechanism. The sensor can now be separated from the valve.

Setting the Desired Room Temperatures

The desired room temperature is set by turning the head. The temperatures obtained are approximate:

Important Notes

Do not cover the thermostat

The thermostat opens and closes as determined by the temperature around it. Therefore, the sensor must never be hidden behind thick curtains, furniture, etc. Alternatively, a thermostat with a remote sensor should be used.

Positive SHUT-OFF feature

The head can be turned past the [*] setting (a slight resistance will be felt) to setting "0" at which point the water flow is shut off completely. After also shutting the lockshield valve, the radiator may be drained and removed for maintenance and decoration purposes.

Lockshield Valve RLV-D

Included in codes: Code no's 013G6003 and 013G6004.

What is a Thermostatic Radiator Valve (TRV)?

TRVs sense the air temperature around them and regulate the flow of water through the radiator to which they are fitted. They do not control the boiler. They should be set at a level that gives you the room temperature you want. These settings may have to be different in each room, and you should set the TRVs to suit each room and then leave them to do their job.

Turning a TRV to a higher setting will not make the room heat up any faster. How quickly the room heats up depends on the boiler size and setting, and the radiator size. Turning a TRV to a lower setting will result in the room being controlled at a lower temperature, and saves energy.

TRVs need a free flow of air to sense the temperature, so they must not be covered by curtains or blocked by furniture. TRVs cannot turn off the boiler when the whole house is warm. To do that, you will need a room thermostat as well. The radiator in the room with the room thermostat should not normally have a TRV, but, if it does, keep the TRV on the maximum setting and adjust the room thermostat as explained with the instructions.