Dimplex Water Heater WB3 User Manual

AUTO-FILL  
WATER BOILERS  
INSTRUCTION MANUAL  
MODELS COVERED  
WB3  
WB7  
WB15  
WB5E  
1
 
INTRODUCTION  
Your new water boiler is designed to give years of trouble free service provided  
that the instructions contained in this manual are followed carefully.  
Your new boiler is energy efficient, simple to operate and easy to service.  
It is recommended that the installation is carried out by a properly qualified fitter.  
CHECK LIST  
Before starting installation, check that you have the following parts:  
1.  
2.  
3.  
4.  
5.  
Boiler Unit  
Case  
Mounting Template  
Fitting Kit  
Tap Kit (WB5E Only)  
INSTALLATION  
POSITIONING THE UNIT  
The heater should be positioned in a convenient place on a wall that is capable  
of supporting it safely. Use the mounting template and fitting kit provided.  
Position the boiler so that the tap is about 400mm above a draining board.  
Leave sufficient space around the unit to enable access for servicing, paying  
particular attention to the position of the top centre fixing screw that holds the  
cover in place.  
Screw in the top two screws leaving about 6mm protruding and hang the  
machine using the keyhole slots provided. Once the machine is positioned,  
tighten the top screws and insert the bottom screw.  
ELECTRICAL CONNECTION ALL MACHINES  
Supply – 220/240V 50Hz – 3kW. The circuit should be protected by its own  
13amp double pole connection unit with flex outlet to BS5733, alternatively the  
circuit should have means of disconnection incorporated in fixed wiring, having  
a contact separation of at least 3mm in all poles. Minimum cable size is 1.5mm2.  
The use of an ELCB is recommended.  
Electrical installation should conform to current I.E.E. wiring regulations.  
When using fixed wiring, the bare section of earth wire must be sleeved to  
within 8mm of the end.  
Only a qualified electrician should carry out this work.  
3
 
WARNING: THIS APPLIANCE MUST BE EARTHED  
REAR ENTRY OF CABLE  
Fixed or flexible cable to be connected direct to the terminal block, cable gland  
not utilised.  
BOTTOM ENTRY OF CABLE  
Use the cable gland. Loosen cable-gripping nut. Pass cable through gland,  
leaving enough free cable to connect into the terminal block. Tighten cable  
gland grip nut.  
DO NOT SWITCH ON UNTIL THE INSTALLATION IS COMPLETE AND THE CASE AND  
TAP ARE IN PLACE  
WATER CONNECTION  
NOTE: Although it will not harm the boiler, it should not be operated with  
the water supply turned off.  
The water supply must have a pressure not exceeding 7 Bar (700kpa) and no  
lower than 1 Bar (200kpa). If the mains water pressure is below1 Bar a fault  
situation could arise as described in section; “Temperature Control and  
Safety cut-outs”.In addition the water inlet valve may not seat properly  
and can cause overflowing  
If your water pressure exceeds 7 Bar, a suitable pressure reduction valve will  
need to be fitted to the water supply to bring it to a level that the machine can  
cope with. Failure to do this could result in the boiler overfilling .  
The manufacturers cannot be held responsible for any machine malfunction if  
the water pressure exceeds that stated. If in doubt, consult your water supply  
company.  
The boiler has a type B air gap in compliance with water bylaws and has both  
WRAS and KIWA approval.  
Please note that washing machine hoses are not suitable for drinking  
water and will cause a very bad taste to the water.  
A 15mm stop valve should be fitted between the water supply and the boiler so  
that the machine can be isolated. Water purification filters are available to  
ensure fresh tasting water. Please contact the service department for details on  
01704 502911. In hard water areas scale can cause problems. Fitting a scale  
reducer will help minimise scale.  
We regret that the manufacturers cannot be held responsible for scale problems  
even if a scale reducer has been installed.  
4
 
BOTTOM ENTRY  
Connect to a suitable cold drinking water supply using 15mm copper pipe and  
push on the ‘T’ piece supplied. The ‘T’ has been blanked off using a brass plug.  
Leave this plug in place. Push the ‘T’ piece firmly onto the water inlet solenoid  
pipe with the brass plug facing forward. Then push the 15mm cold water supply  
firmly into the bottom of the fitting.  
To avoid damage to the unit, do not use any solder connections whilst pipes are  
connected to the boiler.  
REAR ENTRY  
For rear entry of cold water supply, remove the plug from the ‘T’ piece by  
compressing the grey collar and pulling out. Push the plug firmly into the bottom  
of the ‘T’ piece.  
Push the ‘T’ piece firmly into the water inlet solenoid pipe with the ‘T’ facing the  
wall.  
Push the 15mm cold water supply firmly into the ‘T’ fitting.  
To avoid damage to the unit, do not use any solder connections whilst pipes are  
connected to the boiler.  
OVERFLOW PIPE BOTTOM ENTRY  
In your fitting kit you will find a straight push on connector with a small length of  
15mm copper tube pushed into it.  
This connector must be pushed onto the corresponding overflow pipe on the  
bracket (alongside the solenoid).  
If you wish to extend the overflow, remove the copper pipe supplied and replace  
with pipe of your chosen length. The pipe must have a continuous fall and  
should not be longer than 200mm (if a longer run is required use 22mm pipe to  
avoid airlocks). The overflow pipe should have no more than four right angle  
bends and should discharge to a safe visible position.  
Under certain conditions, the overflow pipe could vent steam, hot water or cold  
water and the manufacturers cannot be held responsible should damage arise  
from such discharge if the overflow pipe has not been directed to a suitable  
position where overflowing water can run away safely.  
Under no circumstances should the overflow pipe be allowed to vent  
inside the case of the boiler.  
5
 
OVERFLOW PIPE REAR ENTRY  
In your fitting kit you will find a straight push on connector with a small length of  
15mm copper tube pushed into it.  
If rear entry has been chosen this connector must be replaced by a push on  
elbow (available from plumber’s merchants). Push the elbow onto the overflow  
pipe on the bracket (alongside the solenoid).  
The pipe must have a continuous fall and should not be longer than 200mm (if a  
longer run is required use 22mm pipe to avoid airlocks). The overflow pipe  
should have no more than four right angle bends and should discharge to a safe  
visible position.  
Under certain conditions, the overflow pipe could vent steam, hot water or cold  
water and the manufacturers cannot be held responsible should damage arise  
from such discharge if the overflow pipe has not been directed to a suitable  
position where overflowing water can run away safely.  
Under no circumstances should the overflow pipe be allowed to vent  
inside the case of the boiler.  
VENT PIPE  
A small silicone tube connects the boiler to the wall bracket. Ensure that this is  
connected and that the opening in the bracket is not obstructed.  
FIT CASE  
Attach the L.E.D display lead to the case per the instructions. Using the fixing  
screws fit the outer case to the boiler.  
WB5E ONLY. FIT TAP  
Remove plastic plug from the tap boss. Ensure that the yellow washer is in  
place and carefully screw the chromed tap extension into place using a 28mm  
open-ended spanner to tighten. Do not use grips or tools that are likely to  
scratch the chrome.  
Push the grey tap collar firmly into place and twist to fit snugly against the case.  
6
 
OPERATION (All models except WB5E)  
After the electrical and water connections have been made, switch the power  
and water supply on.  
The power and ready lights will flash once. The power light will then be  
constantly illuminated to indicate mains supply.  
Providing the water supply is present, the machine will start to fill. If the machine  
does not fill to its pre-set level within 4 to 5 minutes the red service light will  
flash 6 times. If this happens, check that the water stop valve is turned on. If the  
valve is on, check that the small plastic filter in the water inlet solenoid on the  
machine is not clogged with debris. To clear the service light, switch the  
machine off and then back on again.  
When the correct temperature has been reached, the ready light will be  
illuminated, wait at least 10 minutes after the ready light illuminates before  
starting to draw water (on first installation only). Your machine does not fill  
completely at once. The water input is electronically controlled to obtain  
maximum output, temperature and efficiency.  
In daily use, switch on and wait for the ready light to illuminate. The water will  
then be at the correct temperature and the boiler ready to use. We recommend  
that you switch the power supply to the boiler off overnight and when the unit is  
not in use.  
7
 
OPERATION (WB5Eonly)  
After the electrical and water connections have been made, switch the power  
and water supply on.  
When the power supply is switched on, the small indicator lamp on the front  
panel will glow orange. This means that the water is filling to the bottom probe.  
When the bottom probe has been reached, the indicator lamp will change to red  
to show heating. When the water has reached the correct temperature the light  
will change green. Wait a further 10 minutes before starting to use.  
Your machine does not fill completely at once. The water input is electronically  
controlled to obtain maximum output, temperature and efficiency.  
In daily use, switch on and wait for the green light. The water will then be at the  
correct temperature and the boiler ready to use.  
TEMPERATURE CONTROL & SAFETY CUT OUT  
A small knob protrudes from the base of the mounting bracket (Not WB5E). This  
controls the boiler temperature. It has been factory set at approximately 98oC  
and should not need adjustment. However, under certain conditions (extreme  
change in ambient room or cold water temperature), the boiler temperature may  
fluctuate slightly. The knob may then be used to adjust this. Using a  
screwdriver, loosen the transit bracket, which holds the knob in place. Turn the  
knob clockwise to increase or anti-clockwise to decrease the temperature.  
All models except WB5E  
Should the temperature be set too high, steam or boiling water will discharge  
through the overflow pipe. In the event of this happening, a high temperature  
control switch will switch off the heater. The red service light will flash 10 or 12  
times depending upon the water level. Switch the boiler off at the electricity  
supply and switch back on a few moments later. This will reset the boiler but if it  
cuts out again it is recommended that you then adjust the temperature by  
turning the knob anti-clockwise. If the boiler continues to over-boil, contact the  
Instanta service department on 01704 502911 for advice.  
WB5E  
Should the temperature be set too high, steam or boiling water will discharge  
through the overflow pipe. In the event of this happening, a high temperature  
control switch will switch off the heater. After a short period, the neon indicator  
will change from green to flashing red or flashing red and green. Switch the  
boiler off at the electricity supply and switch back on a few moments later. This  
will reset the boiler but if it cuts out again it is recommended that you contact  
the Instanta service department for advice.  
CLEANING  
The external surface of the machine can be kept clean by wiping with a damp  
cloth.  
Do not use abrasive material on the outer surface of the machine.  
8
 
TECHNICAL SPECIFICATION ALL MODELS  
Tank constructed in stainless steel.  
Tank insulated from outer casing with high temperature polystyrene.  
All boilers have electronic control of the main functions. This means that the  
temperature is controlled precisely within given parameters. The circuit  
constantly monitors the operation of the machine and warns the user via the  
light if abnormal circumstances have been detected.  
If the light flashes, refer to the diagnosis codes.  
MAINTENANCE  
NOTE: After initial commissioning or subsequent re-commissioning  
(service-repair), check that the water supply has been established prior to  
switching on the boiler.  
The boiler should be periodically checked for scale build up. The frequency  
depends upon hardness of the water and whether or not an effective scale  
reducer is fitted. It is advisable to keep a spare tap spring (part no TP1007/L)  
and washer (part no TP1001/L) in case of emergencies. Apart from the removal  
of scale, no regular maintenance should be required.  
9
 
DE-SCALING All models except WB5E  
To de-scale your machine, first disconnect the machine from the power supply.  
Remove the case by removing the top and bottom screws holding the case to  
the wall bracket.  
Drain the remaining water through the drain plug in the bottom of the tank.  
Remove the boiler lid by unscrewing the fixing screws. The tank is now  
accessible.  
The whole boiler can be disconnected and lifted away from the wall fixing by  
removing the push on water and vent fittings and disconnecting the electrical  
components. However, it is recommended that only a qualified person  
undertakes this work and that unless a qualified person is available, the de-  
scaling is carried out with the boiler on the wall.  
Lift out the baffle plates on the inside of the tank (taking note of the position of  
the plates). Remove as much scale as possible by hand. Dissolve any scale  
that is difficult to remove by using a de-scaling solution. Remember to replace  
the drain plug before using the de-scaler.  
Clean the level sensing probes and their white holders completely using a clean  
non-metallic scourer.  
Ensure all traces of de-scaler are removed before using the boiler again.  
Rather than frequently de-scaling the machine, it may be preferable to install an  
effective scale reducer or WRAS approved food quality water softener. This will  
reduce the frequency of de-scaling but will not remove scale completely in some  
areas.  
DE-SCALING WB5E  
To de-scale your machine, first disconnect the machine from the power supply.  
Drain all the water using the tap. Disconnect the tap. Remove the case by  
removing the top and bottom screws holding the case to the wall bracket.  
Drain the remaining water through the drain plug in the bottom of the tank.  
Remove the boiler lid by unscrewing the fixing screws. The tank is now  
accessible.  
The whole boiler can be disconnected and lifted away from the wall fixing by  
removing the push on water and vent fittings and disconnecting the electrical  
components. However, it is recommended that only a qualified person  
undertakes this work and that unless a qualified person is available, the de-  
scaling is carried out with the boiler on the wall.  
Lift out the baffle plates on the inside of the tank (taking note of the position of  
the plates). Remove as much scale as possible by hand. Dissolve any scale  
that is difficult to remove by using a de-scaling solution. Remember to replace  
the drain plug before using the de-scaler.  
10  
 
Clean the level sensing probes and their white holders completely using a clean  
non-metallic scourer.  
Ensure all traces of de-scaler are removed before using the boiler again.  
Rather than frequently de-scaling the machine, it may be preferable to install an  
effective scale reducer or WRC approved food quality water softener. This will  
reduce the frequency of de-scaling but will not remove scale completely in some  
areas  
SERVICE WARNING LIGHT (WB5E only)  
Your boiler is able to detect certain fault conditions, these are as follows:  
1.  
2.  
Flashing Green  
Flashing Orange  
=
=
The bottom probe is scaled up.  
The water supply is turned off or the  
bottom probe is scaled up  
3.  
Flashing Red  
=
An internal component has failed or.  
The safety cut out has come into  
operation  
4.  
Flashing Green & Red  
=
As Above.  
11  
 
SERVICE WARNING LIGHT (All Models except WB5E)  
All models except WB5E have this facility. This light is designed to help you  
discover the cause of any malfunction. If the circuit senses a problem, the  
service light will flash a number of times and then pause and repeat this  
sequence. Count the number of flashes between pauses and refer to the table  
on the back cover. Some serious service problems will disable the boiler whist  
less serious ones will allow you to continue to operate until a convenient time  
arises for the fault to be rectified.  
NUMBER OF  
FLASHES  
BETWEEN  
PAUSES  
MEANING  
ACTION  
1 Constant Water level sensor has scaled up Clean Sensing Probes  
at normal level and machine has  
filled to a higher level  
2
3
4
5
6
Operating level sensor has been Clean Sensing Probes  
detected but lower level sensor  
has not  
Overfill level sensor has been  
detected but other sensors have  
not  
Clean Sensing Probes  
Danger level sensor has been  
detected and machine functions  
have been shut down  
Clean Sensing Probes  
Thermistor or potentiometer have Call service department on  
failed  
01704 502911  
Quoting the Serial Number  
Boiler has failed to fill in the  
allotted time. Possible causes :-  
1. Water supply turned off.  
2. Water inlet valve has failed.  
3. Blockage in water inlet pipe.  
4. Pipe connecting inlet valve to  
boiler has become detached.  
5. Bottom sensor is scaled up  
The temperature sensor  
Check water supply  
If in order call Instanta  
service department quoting  
the Serial Number  
7
Call service department on  
01704 502911  
(thermistor) has become  
disconnected or the heating  
element(s) have failed.  
Quoting the Serial Number  
8 or 9  
10  
Fault on temperature sensor  
(thermistor).  
Call service department on  
01704 502911  
Quoting the Serial Number  
Call service department on  
01704 502911  
Heating element(s) faulty .  
Quoting the Serial Number  
11  
The water supply has been  
interrupted and the level has  
Check water supply  
12  
 
fallen to a point at which the  
heating element(s) could be  
damaged.  
If in order call service  
department on 01704  
502911  
Quoting the Serial Number  
12  
The machine has over-boiled and Call service department on  
the level has fallen to a point at  
which the element(s) could be  
damaged. Or safety cut out has  
come into operation see  
paragraphs re Temperature  
Control  
01704 502911  
Quoting the Serial Number  
13  
 

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