CMR Electrical WLW User manual

CMR Electrical Ltd
Bolton House
Five Chimneys Lane
Hadlow Down
East Sussex
TN22 4DX
Tel: [phone]
WLW
Water Leak Detection Manual

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Contents
1) System Overview
2) Installation
3) Wiring
4) Water Solenoid Valve
5) Water Flow Sensor
6) Optional water detection cable sensor
7) Relay output
8) Home screen explained
9) Setup page explained
10) Sleep Mode explained
11) Holiday Mode explained
12) Help window explained
13) Setting up the system
14) Alarms their meanings and what to do about it

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1) System Overview
Being fully programmable to suite user requirements, the alarm unit is connected to a flow sensor and
water shutoff valve. All three items should be positioned as close as possible to the incoming water
supply pipe with the flow sensor and valve fitted just after the internal stopcock. Designed to monitor the
flow of water entering the building, flat or area, the unit raises an alarm and shuts of the water supply
when the flow exceeds pre-set limits. Three flow patterns are monitored;
Current Flow
This is the amount of water in litres per minute flowing now. A higher than normal flow can indicate a
burst pipe. This feature is updated every second and is designed to turn off the water supply within 3
seconds from the time the alarm trip point is exceeded.
Water flow without a break
This is a measurement in hours that the water has been flowing without a break. In normal operation,
water is consumed for short periods of time i.e., filling a bath can take 10 minutes, when the taps are
turned off, the flow of water stops. This results in a period of no water flow, until the next call for water is
made i.e., the toilet is flushed. In heavy flow periods, say first thing in the morning when its one shower
after another, toilets being flushed, sinks being filled, the constant flow of water will occur for a longer
period of time but will eventually stop. However, if the flow never stops, this would be an indication of a
leaking pipe or a tap or garden hose being left on. As the system measures in 3ml volumes, small leaks
can be detected such as dripping taps, pipe fittings or radiators.
Volume used without a break
The unit measures the volume of water being consumed within a single flow period. Normally the highest
water consumers would be item such as a bath or garden hose. Excessive water volume can indicate a
burst pipe, or a tap or garden hose being left on.
Optional remote leak sensor
In addition to the flow monitoring, the system can be fitted with a standard water leak detection cable up
to 5m long or spot sensor. As soon as water comes into contact with the cable or sensor, an alarm will be
raised and the water turned off.
2) Installation
THIS EQUIPMENT SHOULD ONLY BE CONNECTED AND WORKED ON BY A QUALIFIED
ELECTRICIAN.
To mount the unit to a wall, first remove the lid to expose the internal equipment. In the bottom and top
corners of the housing are fixing points. 3.5mm pozi-drive screws or any screw with a head no bigger
than 7mm diameter can be used to fix the housing in place. Cable access into the box should be via cable
glands which can be positioned anywhere around the enclosure or on the inside for back entry. Care
should be taken not to damage the internal equipment when drilling the enclosure. A 230VAC power
supply should be run from a fused spur to the unit’s internal terminal block marked “L”, & “N”. The fuse
within the fused spur should be rated at 5 Amps.
The unit should be linked to the water flow sensor by a 0.2/0.5mm² conductor 3 core screened cable up to
a maximum 2 meters away ideally with Red, Black and Yellow cables. The cable screen wire should only
be connected to the black wire terminal and NOT connected at the flow meter end. The shutoff valve
should be installed just after the flow meter and cabled in a 0.5mm² conductor 2 core cable rated for
12VDC 5Watts.

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3) Wiring Detail
L
N
12VDC
shutoff
Valve
Water Flow
Sensor
230VAC5A
Mains Supply
+-
Black
Red
Yellow
SigA
SigB
Com
N/O
Normally open
Contact rated
at 250mA24V
Optional Water DetectionCable
Cable
Screen
Wire
With the exception of the 230VAC mains terminal block, all terminals are of the plugin type allowing the
terminal housing to be removed for ease of terminating the cables. If you do un-plug the terminal housing,
please check that you haven’t reversed the connections when you plug it back into its housing.
Input Power
Water flow
sensor
Wiring
connections
see below
Shutoff valve
Wiring
connections
see below
Optional water
detection cable
Wiring
connections
see below

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4) Water Solenoid Valve
The shutoff valve is a ½” or ¾” BSP female/female, Normally Open, power shut, 12VDC, 5W with
position indicator and Override switch. To override the valve in an emergency, and allow water to flow
with the unit in still in alarm. First pull the override switch toward you until the white knob is just clear of
the blue housing. Then turn the override switch clockwise (direction marked “O”) until the red indicator
bar is in line with the pipe run.
To take the valve out of shutdown and revert back to normal running, push the Override switch toward
the blue housing allowing the valve to automatically open itself.
WARNING, IF YOU USE THE OVERRIDE FACILITY YOU MUST TAKE THE VALVE OUT OF
OVERRIDE WHEN THE EMERGANCY HAS BEEN RESULVED. ONCE IN OVERRIDE, ALWAYS
IN OVERRIDE.
5) Water Flow Sensor
The sensor has ½” or ¾” male/male connections, should be fitted after the water shutoff valve and in
close proximity to the stopcock, i.e., stopcock, then shutoff valve then flow sensor. Direction of flow is
important for the unit to operate correctly with the arrow (see picture below) inline with the water flow.
Three cables emanate from the sensor, Black, Red and Yellow. For correct operation and to avoid damage
to the unit, all three wires must be correctly connected to the alarm unit as follows.
Flow Sensor Alarm Unit 3-way terminal block
Black wire
Terminal marked “Blac
k”
Red wire
Terminal marked “Red”
Yellow wire
Terminal marked “Yellow”
WARNING, incorrect connections will cause damage to the sensor. The Maximum pressure of this
device is 1.75MPa (17.5 bar) Maximum operating temperature 80°C
Red indicator bar Override Switch

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6) Optional water detection cable sensor
The two water detection cable wires are not polarity conscious and therefore can be fitted to any “Sig”
terminal. To connect the cable, first position it around the area to be protected and connect one of the
wires to the 4-way terminal block, terminal “SigA” with the other wire to “SigB”
7) Relay output
A solid State normally open, close in alarm, contact has been provided to give external alarm indication.
The contact is rated for 24VDC 250mA. To use this contact, use the 4 way terminal block, terminals
marked “Com” and “N/O”
8) Home screen
This screen consists of three bar graphs, “Current Flow in L/Min”, “Water Flow without a Break” and
“Volume Used without a Break”. Each bar graph will turn red (left to right) to indicate how close to the
maximum setting (far right) each parameter is before the water is turned off. For more information about
each parameter see section 1. To the right of the screen are four push buttons that will be described in
more detail further on. Each bar graph is calibrated from the settings entered in the “Setup” page, so if say
“Current Flow in L/Min” is set to a maximum of 25, the bar graph will be ranged between 0 far left to 25
L/min far right. Once the system detects a no water flow period of 15 seconds or more, all three bar
graphs will reset and fall back to the zero-position waiting for the next water flow period.
9) Setup page
To enter setup, press the “Setup” push button on the home screen. Once the
screen is on display, you have 2 minutes to make adjustments before the system
automatically reverts back to the Home screen. Each parameter can be adjusted
buy using the plus (+) and minus (-) buttons positioned to the left and right side
of each parameter. Once you have finished press the “Exit” button to save
changes. More information about setups can be found in “setting up the
system” below.
10) Sleep Mode
This feature is provided to allow long high-volume water flow periods to occur
without tuning off the water supply. By pressing the “Sleep Mode” button, the
system will stop looking at the water flow for eight hours or until the “Cancel
button is pressed. Once the eight hours have elapsed, the system will
automatically reset itself and start monitoring the water flow. This feature can
be used when filling a fish pond or long periods of watering the garden.
11) Holiday Mode
Holiday mode has been provided to protect your home whilst away for long
periods of time. It is presumed that the house, flat or area will be empty and
there will be no water used other than say a central heating tank topping up. By
pressing the “Holiday Mode” button, the system will monitor the water flow
allowing only one litre of water to flow over a period of one hour. If this limit is
exceeded, the system will automatically turn off the water. To cancel this
feature, press the “Cancel” button. This feature should not be used, if you are
expecting someone to enter the property or area during your absents i.e. cleaner or relative.

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12) Help screen
This has been provided to help you remember how the system operates with a
description of each alarm parameter.
13) Setting up the system
Older houses were built with a water storage tank in the loft. This meant that mains pressure and water
flow rates were not very important because all the mains had to do was fill the tank and provide clean
water to kitchen. For this reason, houses were normally provided with a 1/2” (15mm) mains water pipe,
providing about 18 litres per minute of flow. In new or refurbished houses, the plumbing layout feeds
water to every device that consumes water i.e., toilet, bath, washing machine etc., this is called a direct or
pressure fed system. In a modern house with a direct fed system, a 22mm (3/4”) water supply pipe will be
provided to allow approximately 35 l/min to flow. However, the more bathrooms there are, the larger the
pipe diameter needs to be. Many new houses now have a 28mm (1”) water supply with some larger
houses having a 35mm (1” 1/4”) supply. Flow rate is the amount of water flowing past a given point, for a
given period of time, normally measured in litres per minute (l/min). Flow rate is dependent on the
pressure, pipe size and length of pipe from the source. If you have good pressure and a large supply pipe
you will have a better flow.
On powering up for the unit for the first time, the system will automatically be set to;
Water Flow without a break = 5 hours
Current Water Flow L/Min = 19 L/Min
Volume Used without a Break = 500 litres.
Setting up the “Water Flow without a Break” alarm trip point
To enter setups, press the “Setup” push button. Under the heading “Water Flow without a Break” you will
notice a plus (+) button on the right, a minus (-) button on the left and the current alarm setpoint in the red
rectangle. Use the plus and minus buttons to adjust the current set point (minimum 1, maximum 10
hours). Once you have finished you can repeat for other parameters or press the “Exit” button to save
changes. The display shows the number of hours water is allowed to flow without a break. You will need
to determine if the property is a light consumer or heavy consumer of water. For light uses one would
expect only short periods of water flow with the maximum flow period being when filling a bath or
having a shower once a day. For light users, the system should unusually be set to 1 hour and increased if
the unit goes into alarm. For heavy users where the flow is constant all day, set between 8 and 10 hours.
Setting up the “Current Water Flow L/Min” alarm trip point
Enter setups and adjust the alarm setpoint as described in “Setting up the Water Flow without a Break
alarm trip point”. You should adjust the alarm setpoint to the maximum amount of water in litres per
minute (minimum 18, maximum 50 L/Min), that can flow through your incoming mains water pipe. To
help see the table below and explanation below.
Average flow rate
Supply
Pipe Size Low pressure
Flow rate,
(L/Min) 3
bars or less
Normal
pressure
Flow rate,
(L/Min) 3-6
bars
High
pressure
Flow rate,
(L/Min) 6
bar or more
15mm
10
1
9
2
8
22mm
20
3
9
5
8
28mm
3
3
6
5
9
7
The above table can be used to determine the maximum water flow for your application. This will help
when setting up the “Current Water Flow L/Min” alarm setting, i.e., if you have a 15mm mains water
pipe emanating from your stopcock, and the water pressure is between 3-6 bar, set the alarm trip point to
20 L/Min or just above.

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Setting up the “Volume Used without a Break” alarm trip point
Enter setups and adjust the alarm setpoint as described in “Setting up the Water Flow without a Break
alarm trip point” (minimum 100 maximum 2000 litres). This setting is volume based and is dependent
upon whether the property uses large quantities of continually flowing water i.e., garden hose used every
day. For light users where only one person occupies the property set the trip point between 100 and 200
litres. Where there are a number of occupants that could have baths or showers at a set time i.e., bath time
where the washing machine or dishwasher or both could be going, adjusted between 500 and 800 litres.
Obviously for gardeners, this setting will require a bit of trial and error to workout how much water you
use on the garden at any one time. But to help, the average hose or sprinkler can consume 900 litres per
hour.
14) Alarms their meanings and what to do about it
The unit has four alarms as outlined below. Each alarm will sound the audible warning device, display the
nature of the alarm and close the water shutoff valve to stop further damage. Before pressing the “Turn
Water On” push button, turn off all water outlets including the garden hose and check the house for leaks.
Once you are happy that there are no water leaks, press the “Turn Water On” push button to open the
shutoff valve and cancel the alarm. You will notice that the “Setup” button has been provided on the
alarm screen. Once you are happy that there are no leaks, you can use this button instead of the “Turn
Water On” button to increase the alarm setpoint as well as resetting the alarm. This feature is useful when
setting up the system for the first time, where the water flow rate is unknown and the system keeps going
back into alarm as soon as the “Turn Water On” button is pressed.
Extreme Water Flow Detected
This screen will be displayed when the water flow exceeds the alarm “Current
Water Flow L/Min” setting and could be an indication of a burst pipe. Another
reason for this alarm to be activated could be that several kitchen appliances,
sink, bath and garden hose are asking for water at the same time.
Constant Water Flow Alarm
Displayed when the water flow has not stopped for the period of time set in
setups. If the units “Water Flow without a Break” setting is set to say 1 hour,
regardless of how much water is flowing, be it a drip or flood, providing the
water keeps flowing for one hour without a break, the unit will go into alarm.
The constant flow monitoring is reset every time the unit sees a 15 second or
longer no flow period. Therefore, if the constant flow timeout reaches 58
minutes, two minuets before an alarm is instigated, and the water stops flowing
for 15 seconds, the alarm monitoring is reset and the timeout begins again.
The Maximum Volume of Water in one Flow has been reached
This screen will be displayed when the amount of water consumed within a
single flow exceeds the alarm “Volume used without a Break” setting. Reasons
for this alarm could be a leak from a damaged fitting, bust pipework, fractured
water tank, bath taps or garden hose left on, filling a fishpond or large water
tank.

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Water Has Been Found
This screen will only be activated if you have an external water detection
sensor or cable (see section 2) connected to the device and the device has come
into contact with water. This is an On or Off alarm with no setting to adjust.