Wijas POW 12H Installation instructions

Flow pressure water heaters
type POW 12H, 15H, 18H, 21H
INSTRUCTIONS FOR
ASSEMBLY AND OPERATION
EN

2
Before using the heater please read the instructions carefully. In the future it will pay off
in the form of failure-free operation for a long time. Flow water heaters series POW 12H,
15H, 18H, 21H with two-degree hydraulic switch are designed for heating utility water.
Warm water can provided to a couple of water drawing points located in different rooms.
These heaters are equipped with heating spirals that are directly washed by water. This
direct heating process prevents limescale from settling and ensures high efciency and
quick heating of water. The electronic system of the heater is equipped with an air block
sensor that decreases to minimum the possibility to damage immersion heaters due to air
blocking of the water supply installation.
It also gives bigger possibilities in the selection of power for different degrees switching on
depending on the amount of owing water.
Safety recommendations
n The manufacturer does not take any responsibility for the damage resulting
from non-compliance with the operating instructions.
n The appliance cannot be installed in the rooms where the temperature drops
below 0OC and where there is a danger of explosion.
n
n
The heater cannot be installed in an aggressive environment
n
n The power supply must be securely cut off before the housing of the heater is
taken off.
n The heater must be securely connected to the electrical wiring equipped with
an earth clamp and a circuit breaker.
n Water resistivity cannot be lower than the one indicated on the rating plate.
n Immediately switch off the breakers and cut off the water supply in case of
malfunction of the heater or its leakage. The damage can be removed only by
the manufacturer or in the authorised service centre.
n The appliance cannot be used for industrial purposes. It is only intended for
heating drinking water.
n Maximum feed water temperature cannot be higher than 28OC.
n The appliance can only be used when it has been installed properly and it is
in perfect technical condition.
n It is forbidden to make any technical changes in the heater construction.
The unit must never be exposed to temperatures below 0°C.
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.

3
n The heater does not have any electronic temperature control unit what may
cause the temperature rise as a result of lower water ow or the rise of the
temperature of the water ttings.
Instructions for assembly
Installation as well as start-up of the POW-H heater should be done by an authorized per-
son in accordance with the instructions included in the Instructions. Any installation works
should be done with disconnected power and water supply.
Electric installation of the heater should be made pursuant to the binding regulations. The
device should be permanently connected to an electrical installation with an earth terminal.
Electrical installation should be equipped with a residual circuit breaker with the protection
against electric shock, as well as a breaker ensuring the disconnecting of the device from
the source of power supply in which the distance between contacts should be not less
than 3 mm.
1. To the place in which the heater is to be installed, electrical as well as water installation
should be supplied using the assembly template for that.
2. Drill holes and insert expansion plug.
3. After supplying cold water, install the control valve with a lter (pict. 3).
4. Unscrew the located at the bottom of the heater casing screw fastening the casing
(pict. 1), take off the cover and disconnect the belt cable by taking out the plug from
the socked marked “KEYBOARD” (pict. 2).
5. Screw the heater to the wall with the fastening screws, having previously led the supply
cable through the hole.
6. Check the turning on of the pressure switch.
7. Remove blanking plugs from water connections.
8. Connect the heater to water installation (pict. supply connection marked 9, outlet marked
10)
9. Switch on the water feeding the heater and check the watertightness of connections.
10. Reduce the maximum water flow with the control valve to the value given in the chart.
11. Connect the heater to the electrical installation as shown on pict. 4.
12. Connect the belt cable by plugging the plug to the socket “KEYBOARD”(pict.2).
13 Place the casing and screw with the fastening screw.
Fixed power
of the heater
Maximum
water flow
l/min
21 kW
7 - 9
18 kW
6 - 8
15 kW
5 - 7
12 kW
4 - 6
Maximum
water flow
l/min
21 kW
18 kW
15 kW

4
Pict. 3.
Pict. 1. Casing of the heater
1. Power indicator
2. Button increasing the heating power
3. Button decreasing the heating power
4. The screw fastening the casing
Pict. 2. Display plate with belt cable
1. Plug
2. “KEYBOARD” socket
3. Keyboard plate

5
Pict. 4. Diagram of electrical installation
Start-up
In order to remove air from the water installation and the heater prior to turning on electric
power, open warm water valve for about 20 seconds. Then turn on the power. After turning
on the power all indicators will light. Warm water valve should be opened again. The indica-
tors will go out for about 10 seconds. After that time the device will be in standby. Pulsating
light on the power indicator will signal the start of the water heating process, as well as
the chosen power. Close warm water valve. The heater will turn off heating signalling that
state with the change of the pulsating light of the indicator to continuous. By means of “–”
or “+” buttons, the desired power on the power indicator can be set.
Use
Setting the heating power is done by pressing one of the buttons on the casing marked
with “–” or “+” signs.
Detecting by the heating system bigger ow than the minimum for I power degree will result
in switching it on what is signalled with pulsating red light on the power indicator. The drop
of the ow below the switching point will result in the switching the heating off, and the
pulsating light will change into continuous. Adjustment of temperature of outlet water may
be done by changing the heating power. Heating power 1 – low temperature of outlet water
with low, economical power consumption. Heating power 5 – high. As well as by increasing
or decreasing the water consumption.
Decreasing the water consumption results in the increase of temperature. Increasing - its
drop. Depending on the season of the year, the temperature of water feeding the heater
will change. Colder water in winter will require stronger heating which will require the set-
ting of higher heating power.

6
Cleaning the water lter
In a situation when the lter is partially or fully blocked, follow the steps:
1. Disconnect the power supply
2. Unscrew the fastening screw located at the bottom of the casing (pict. 1), then take the
casing off holding it in such a distance from the heater so that the belt cable connect-
ing the keyboard with the heater was not stretched, and then disconnect the cable by
taking out the plug from the socket marked “KEYBOARD” (pict. 2).
3. Close the control valve (marked 1)
4. Open the plug of the control valve (marked 2)
5. Take out mesh and magnetic lters (marked 3, 4)
6. Remove dirt
7. Insert lters
8. Close the valve plug.
9. Open the ow on the control valve and check the watertightness of connections.
10. Connect the belt cable to the keyboard plate (pict. 2).
11. Close the casing
12. Perform the air relief of the heater, and then start it according to chapter “Start-up”.
Water
temperature
at the inlet
Water temperature
at heater outlet 40OC
Water temperature
at heater outlet 50OC
POW
12H
POW
15H
POW
18H
POW
21H
POW
12H
POW
15H
POW
18H
POW
21H
5OC 4,9 6,2 7,4 8,7 3,9 4,8 5,8 6,7
10OC 5,8 7,2 8,6 10 4,3 5,4 6,5 7,6
15OC 6,9 8,7 10,5 12,1 4,9 6,2 7,4 8,7
Efciency of warm water depends on the temperature of inlet water.
Adjusting the
heating power
POW 12H POW 15H POW 18H POW 21H
Power I/II degree Power I/II degree Power I/II degree Power I/II degree
1 4/6 KW 5/7,5 KW 6/9 KW 7/10,5 KW
2 4/8 KW 5/10 KW 6/12 KW 7/14 KW
3 6/8 KW 7,5/10 KW 9 /12 KW 10,5/14 KW
4 6/12 KW 7,5/15 KW 9/18 KW 10,5/21 KW
5 8/12 KW 10/15 KW 12/18 KW 14/21 KW

7
Pict. 5. Control valve with a lter
1. Control valve knob
(position: ow closed)
2. Valve plug
3. Magnetic lter
4. Mesh lter
Mulfunctioning of the heater
Removing the given below causes of mulfunctioning of the heater is not included in manu-
facturer’s warranty. In case when none of the causes occurs, please contact a service point.
The indicator of set power does not light:
– not connected belt cable connecting driver plate with keyboard plate (pict.)
– defect of the power supply installation of the heater.
Too low water ow:
– blocked water lter
– too low water pressure
– control valve closed too much
– not fully opened main valve.
The heater does not heat or barely heats.
– wrong hydraulic assembly, defect of the electric installation powering the heater
– too strong ow of water – turn down the control valve in the heater.

8
1. Lower casing
2. Heating unit
3. Air block and ow sensors
4. Thermal switch
5. Pressure switch
6. Network terminals being parts of the pres-
sure switch
7. Hole for inserting the supply cable
8. Power plate with a driver
9. Connection of feedwater (cold)
10. Connection of feedwater (warm)
11. Terminal of the protective cable
Internal structure of the device
Pict. 6.

9
Pict. 7. Schematic diagram POW 12H, 15H, 18H, 21H
1 – thermal switch
3 – driver plate
4 – heating unit
5, 6 – air block and ow sensors
7 – pressure switch
PE – terminal of the protective cable
G1, G2, G3 – immersion heaters

10
Contents of the packaging
POW-H heater 1 pcs.
Control valve 1 pcs.
Fastening screws with expansion plugs 3 pcs.
Gaskets 2 pcs.
Template 1 pcs.
Instructions manual 1 pcs.
Warranty card 1 pcs.
POW heater 12H 15H 18H 21H
Rated power kW 12 15 18 21
Supply voltage 400 V 3~
Frequency Hz 50
Maximum power consumption A 17,3 21,6 26 30,3
Minimum cross-section
of connection cables mm24 x 2,5 4 x 2,5 4 x 4 4 x 4
Maximum cross-section
of connection cables mm24 x 10
Rated current of the circuit breaker A 20 25 32 40
Minimum electrical resistivity
of water at 15OCΩcm 1100
Pressure of feedwater MPa 0,2 – 0,6
Minimum ow switching
on I degree of power l/min 3 3,6 4 4,6
Minimum ow switching
on II degree of power l/min 4,2 5,1 5,7 6,8
Maximum temperature of feedwater OC 20
Water connection G ½”
Dimensions
(height x width x depth) mm 447 x 235 x 104
Mass kg 3,7
Technical data
Splash-proofness IP24

11

12
IMPORTANT INSTRUCTIONS
CONCERNING THE DETERIORATED DEVICE
Pursuant to the provisions of the Act dated 29 July 2005 on waste electric and
electronic equipment, it is forbidden to put together with municipal waste the dete-
riorated equipment marked with the symbol of crossed out bin.
A user who intends to get rid of the product, should take the waste electric or
electronic equipment to the point collecting the waste equipment. Collection points
are run, among others, by wholesalers or retailers of such equipment as well as by
gmina organizational units conducting the activity in the scope of collecting waste.
The above statutory obligations have been introduced in order to limit the amount
of waste created from deteriorated electric and electronic equipment, as well as to
ensure the proper level of collecting, recovering and recycling the waste equipment.
In the equipment there are no dangerous elements which have a particularly nega-
tive effect on health and the environment.
The materials used in the device are re-usable. Thanks to re-use, re-use of ma-
terials, or other forms of use of the deteriorated devices, you contribute signicantly
to the protection of our environment.