Infrared Urinal Flush Controls
Installing the Infrared Cistermiser (IRC)
The IRC urinal flush control consists of two primary elements: a solenoid valve with compression fittings and the sensor module. The solenoid assembly is plumbed in on the water supply to the urinal cistern. The connection to the sensor is made either by directly mounting the Passive Infrared (PIR) sensor module onto the solenoid or using the 'floating socket' supplied for a remote mounting.
It is not necessary to adjust the sensor; the operating sequence is pre-programmed. It is possible to adjust the flow rate of the water into the cistern for maximum water economy.
When fitting the brass solenoid assembly to the pipe the flow direction should be noted. If necessary the solenoid can be turned through 180° to give access to the pin connections. The solenoid is supplied with an interchangeable valve seat which is used to increase the flow on low pressure supplies.
The sensor module can be mounted on the unit itself or remotely on the wall or ceiling requiring a wire connection. If mounted remotely the sensor module may be surface mounted using a standard pattress box (not supplied) or recessed into a suspended ceiling using the 'ceiling mounting kit' (CMK) which is supplied separately. A warning light on the front of the sensor module indicates low power if the unit is fitted with batteries and a manual push-button provides a self-test sequence.
Operating Sequence of the IRC
On detection of movement in the washroom a pulse from the sensor opens the normally-closed solenoid valve and water flows to the cistern: at the same time the PIR sensor is switched off.
The initial open period is 25 minutes after which time the power to the PIR sensor is restored. Any occupancy during the next 5 minutes will cause the cycle to repeat. If no occupancy is detected the solenoid valve is closed, shutting off the water supply until the next occupancy is detected. The integrated flow regulator within the valve allows the volume of water passing to the cistern during the 30 minute open period to be adjusted. Generally this should be set so that the cistern flushes once every time the valve is opened. i.e. every 30 minutes during occupation. If the sensor detects no occupancy in 12 hours it will automatically open the valve for 30 minutes to allow one flush to rinse the urinals and pipework.
The sequence is designed to maximise battery life, giving approximately 3 years' life from one good quality set of cells depending on washroom use.
| PIR Sensor Unit | Contained within a white moulded ABS case designed to fit directly onto the solenoid valve assembly or a standard 3.25" × 3.25" (83mm × 83mm) pattress box for surface mounting. At the back there is access to the battery compartment and terminals for a 240V mains power supply to the integral and in-built transformer and the 6V DC output to the solenoid. |
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| Dimensions Range | 85mm × 85mm × 63.5mm (W × H × D) including the sensor lens approx 3.5m field of view, 138° horizontal, 125° vertical |  |
| Power Solenoid Voltage Mains Supply Battery supply Recommended Batteries |
6V DC: nominal 54μA, Peak 750mA, for 50ms 220V - 240V 50Hz 20mA × 1.5v Alkaline Type LR6 Activair EP918 or Duracell Procell MN 1500 – Cap. 2700mAh |
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| Solenoid Valve | 6V latching valve, UK WRAS approved. One valve per sensor. | |
| Water Supply Pressure | 0.1- 6 bar (for >6 bar a reducing valve is recommended). Integral, adjustable flow regulator and interchangeable valve seat (see below) |
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| Valve Seat | Pressure | Max Flow (litres per minute) | Min Flow (litres per minute) |
| 1.5mm orifice insert | 6 bar | 2.7 | 0.03 |
| 1.5mm orifice insert | 2 bar | 1.6 | 0.01 |
| 3.0mm orifice insert | 2 bar | 3.0 | 0.05 |
| 3.0mm orifice insert | 0.1 bar | 0.9 | no flow |
| NB 3.0mm orifice should only be fitted when fed from a tank below 5 metres head. | |||
Installation information [PDF document]
F.A.Q.
