Wijas SMART 3.5 User manual

SMART 3.5, 4.0, 4.5, 5.0, 5.5
pressurized instantaneous water heaters
INSTALLATION
AND OPERATING
INTRUCTIONS
EN

2
1. Purpose
PERFECT pressurized instantaneous water heaters are designed to supply hot water to
such sanitary devices as washbasins and sinks. Due to economic reasons, it ought to
be installed as close to the hot water connection as possible. The device is adjusted to
operate in a wet environment. However, it is prohibited to splash it with water. Maximum
inlet water temperature should not exceed 30°C.
It is worth remembering that the efciency of each instantaneous water heater depends
on:
its power
water stream in the device. The higher water ow, the lower outlet water temperature
and the other way round (table 3)
voltage drops in the electrical wiring. For instance: the voltage drop by 10% results
in lowering the heating efciency of the device by 19% (table 1). Voltage drop below
185V may cause that the electronic system will prevent the device from activating
inlet water temperature
Heater power depending on voltage
Voltage [V] 230 220 210 200 190
Smart 3.5 [W] 3500 3200 2917 2646 2390
Smart 4.0 [W] 4000 3640 3320 3024 2720
Smart 4.5 [W] 4500 4095 3735 3400 3060
Smart 5.0 [W] 5000 4550 4150 3780 3400
Smart 5.5 [W] 5500 5030 4585 4158 3753
table 1
Caution!!!
It is prohibited to install, disconnect or move the heater to the sides while
the power is turned on. The device can operate only in the position shown
in the gure below. Any attempt to start the device in other position will
cause damage to the heating element and the loss of warranty.
g.1
CORRECT INCORRECT INCORRECT INCORRECT

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2. Safety recommendations
the heater ought to be installed by a qualied person
the heater must be permanently connected to the electrical wiring equipped with an
earthing clamp and a residual circuit breaker
the heater can operate only in the position shown in gure 1.
be careful not to swap protective earth with the power supply cable
the heater can operate only with some suitable protections which work properly
the device cannot be installed in the rooms where the air temperature may decrease
below 0°C.
the device cannot be installed in an aggressive environment or the environment
exposed to explosion
the heater can be used only when it is fully-operational
in case of malfunctioning of the device, immediately cut off the water and power
supply
all maintenance works should be conducted when the device is disconnected from
the power source
only original parts can be used
do not take off the heater case when the device is connected to the power source
do not allow the electronic system to get wet
in case of damage or malfunctioning, disconnect the device from the power supply
and cut off the water supply by the use of the cut off/ow control valve
periodically clean the faucet aerator
periodically check the condition of the electrical wiring (voltage drops) - especially
the electrical connection
the water ow in the heater ought to be controlled in such a way that the water
temperature does not cause the feeling of heat (especially as far as children are
concerned)

children should be supervised to ensure that they do not play with the device
if there is a non-return valve installed on the water supply pipe the safety valve must
be tted between unit and non-return valve.
the unit must never be exposed to temperatures below 0°C.
the unit can only be connected to the cold water supplies.
electric installation must be equipped with residual current protective devices and
other solutions which will ensure disconnecting the heater from the source of power
(intervals between all their poles should not be less than 3 mm).
3. Wiring system
the instantaneous heater can be used only after being earthed
the electrical wiring must be equipped with a residual circuit breaker
minimal cross section of the power supply cable and fuse rating must be selected
according to table 3
check the condition of the electrical wiring (especially the electrical connection)
before installing the device
check voltage drops in the electrical wiring after the activation of the device
this device may be used by children over three years old and people with limited
physical, sensory or mental abilities, or with no experience and knowledge if they
are supervised or were provided with instructions regarding the use of the device in
a safe way and understand possible dangers

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Type Smart
3.5
Smart
4.0
Smart
4.5
Smart
5.0
Smart
5.5
Minimum cross section [mm2] 1,5 2,5 2,5 2,5 2,5
Current consumption 15,2 17,4 19,6 21,7 23,9
table 2
4. Water supply system
g.2
WATER
HEATER
Fuse
WATER
HEATER
water lter
cut-off valve
cold water
hot water

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5. Installation
Caution!
The heater can only operate in the position shown in gure 1. Installing
the device in other position or installing it without the water lter may
lead to the damage to the heating element and the loss of warranty. Do
not screw the hoses too much so as not to damage the thread. Do not
seal the stub pipes with the so-called oakum or teon tape. Protect the
electronic system from getting wet.
1. Put the template to the place where the heater is to be installed. Then, mark the
places where the holes for rawlplugs and the hole for a supply cable will be drilled.
The supply cable can be connected to the heater in two different ways illustrated in
gure 3 and gure 4.
2. Screw the heater to the wall.
g. 3
g. 4
remove with a knife
screw the heater
to the wall
screw the heater
to the wall
hole for a supply
cable

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g. 5
3. Connect the heater according to section 4 of the manual. Remember to insert the
water lter according to the instructions shown in the g. 5. Use only exible hoses
with rubber gaskets designed for pressurized installation. Do not swap the heater
outlet (red) with the heater inlet (blue).
Caution! Do not screw the hose nuts too much so as not to damage the
stud pipe threads of the heater. Removing the water lter will result in the
loss of warranty. The lter must be installed according to the instructions
given in g. 5.
4. Turn on the water and check leak tightness of hydraulic connections. If the electronic
circuit gets wet, remove the water by blowing air onto it.
5. Release the air from the device at high water ow rate.
6. Connect the heater to the electrical wiring.
CORRECT INCORRECT

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Caution!
After each installation of the case, carefully check if both gaskets (the
blue one and the red one) of the stub pipe closely t to the heater’s case.
7. Exchange the aerator (strainer) for the aerator supplied by the manufacturer.
8. Adjust it according to the instructions given in section 6 of the manual.
9. Remember to periodically clean sediment from the aerator (strainer).
Term block
L – phase wire
N – neutral
– protective earth
g. 6

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6. Temperature adjustment
Caution!!!
The water temperature in the instantaneous water heater depends on
the water ow rate. The higher ow rate, the lower temperature and the
other way round. Too high outlet water temperature may trigger thermal
protection causing device blockage. To unblock the device, you have to
press the thermal protection button.
1. Cut off the power supply of the heater.
2. Take off the case.
3. In order to increase the outlet water temperature, lower the water ow by turning the
control valve with a screwdriver towards ”+” or to lower the outlet water temperature
by turning the control valve towards “–“. (g.7).
Use table 3 to reach an ideal water temperature..
Outlet water temperature 15OC
Water ow [l/min] 1,5 2 2,5 3 3,5
Smart 3.5 [OC] 48 40 35 32 –
Smart 4.0 [OC] 53 43,5 38 34 –
Smart 4.5 [OC] 59,5 48,5 41 37 –
Smart 5.0 [OC] 62,5 50,5 43,5 39 35
Smart 5.5 [OC] – 54 46 41 37,5
table 3
cold water
stub pipe
control valve
g. 7

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4. Clean sediment from the lter.
5. Insert the lter into the heater inlet with a basket bottom down (g. 9)
g. 9
4. Put on the case to check the leak-tightness of stub gaskets.
5. Turn on the power.
6. In case the water temperature is either too low or too high, repeat the regulation
procedure starting from the point 1.
7. Cleaning the water lter
1. Cut off the water supply to the cut-off/control valve and disconnect the device from
the power supply.
2. Disconnect the hose from the heater inlet.
3. Remove the lter (it is advisable to use a small screwdriver – g. 8)
g. 8
CORRECT INCORRECT
water lter
6. Connect the hose to the heater.
7. Turn on water and check leak tightness of hydraulic connections.
8. Before you switch on the power supply, check if the electronic system did not get
wet. If it did, blow the water from the electronic circuit board.
9. Adjust it according to the instructions given in section 6 of the manual.

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8. Cleaning the faucet aerator
Every now and then it is advisable to press the rubber strainer of the aerator in order to
crush the scale on the outlet channels. It is also recommendable to unscrew the aerator
in order to check whether there is no scale under it.
9. Defects and their countermeasures
Too low water ow:
clogged water lter (clean it according to the instructions given in section 7 of the
manual) or clogged aerator
The heater does not activate:
the heater inlet swapped with the heater outlet
excessive water ow control
clogged water lter (clean it according to the instructions given in section 7 of the
manual),
too low water pressure in the water supply system
no power supply – a blown fuse
The heater does not heat despite the fact that the control light indicating device
activation is turned on:
too low voltage in the electrical wiring (overloaded wiring)
very low inlet water temperature,
too high water ow rate (adjust it according to the instructions given in section 6 of
the manual)
Too low outlet water temperature:
too high water ow rate (adjust it according to the instructions given in section 6 of
the manual)
too low inlet water temperature
signicant voltage drops in the electrical wiring (look at section 1 table 1)
Too high outlet water temperature:
excessive water ow control by the control valve (adjust it according to the section
6 of the manual)
clogged water lter (clean it according to the instructions in section 7 of the manual)
too low water pressure in the water distribution system
The heater turns on and immediately turns off:
uctuating water pressure in the water supply system
excessive water ow control by the ow control valve
Abrupt changes in outlet water temperature:
voltage uctuations in the electrical wiring
changes in the water ow rate caused by sudden water pressure drops in the water
supply system

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10. Technical data
Type Smart
3.5
Smart
4.0
Smart
4.5
Smart
5.0
Smart
5.5
Power [kW] 3.5 4.0 4.5 5.0 5.5
Current consumption [A] 15.2 17.4 19.6 21.7 23.9
Voltage [V] 230 230 230 230 230
Minimum activation ow
rate [l/min] 1.1 1.25 1.4 1.5 1.6
Maximum water pressure
[MPa] 0,65 0,65 0,65 0,65 0,65
IP rating IP24 IP24 IP24 IP24 IP24
Minimum water resistivity
at 15OC [Ωm] 1300 1300 1300 1300 1300
11. Set contents
1. Instantaneous water heater 1 piece
2. Water lter 1 piece
3. Rawlplugs Ø6 2 pieces
4. Template for drilling holes 1 piece
5. Aerator (strainer) 1 piece

SAFE DISPOSAL OF WASTE
Pursuant to the provisions of the Act dated 29 July 2005 on Waste
Electrical and Electronic Equipment , it is forbidden to dispose of the
waste equipment marked with a crossed-out bin to the communal waste
bins.
A user who intends to get rid of this product is obliged to take the
equipment he no longer uses to the collection point. Such points are
run, among others, by wholesalers or retailers of such equipment and
by local organisational units specialising in waste collection.
The above statutory regulations have been introduced in order to
limit the amount of the electrical and electronic waste, as well as to en-
sure the suitable level of waste collection and its recycling. The heater
contains no hazardous substances which have a particularly negative
impact on health and environment.
The materials used in the device are reusable. Thanks to it, when
you reuse them you contribute to environment protection