OPERATING AND
INSTALLATION MANUAL
LITTLE FLOW HEATERS
PTO 3.5
PTO 5
PTO 6.5
PTO 8
Družstevní závody Dražice-strojírna s.r.o.
Dražice 69, 294 71 Benátky nad Jizerou
tel.: +420 / 326 370 911
fax: +420 / 326 370 980
export@dzd.cz
e-mail:
CONTENTS
1 PRODUCT TECHNICAL SPECIFICATION ....................................................................................................... 4
1.1 PRODUCT DESCRIPTION .................................................................................................................... 4
1.2 TECHNICAL DATA ............................................................................................................................... 5
1.3 OPERATION INSTRUCTIONS ............................................................................................................... 6
1.4 SAFETY FEATURES OF THE PRODUCT ................................................................................................ 6
1.4.1 PRESSURE SWITCH ......................................................................................................................... 6
1.4.2 SAFETY ELECTRONICS .................................................................................................................... 6
1.4.3 PRESSURE FUSE.............................................................................................................................. 6
2 ASSEMBLY INSTRUCTIONS ......................................................................................................................... 7
2.1 WATER CONNECTION ........................................................................................................................ 7
2.1.1 ELEVATED INSTALLATION .............................................................................................................. 7
2.1.2 LOW INSTALLATION ....................................................................................................................... 8
2.1.3 FLOW HEATER WITH COMBINATION FAUCET AND SHOWER ....................................................... 9
2.1.4 CONNECTION OF WATER - FLOW HEATER WITH COMBINATION FAUCET, SWIVEL ARM
AND SHOWER ................................................................................................................................ 9
2.2 CONNECTING THE HEATER TO ELECTRIC NETWORK ....................................................................... 10
2.3 MAINTENANCE INSTRUCTIONS ....................................................................................................... 10
2.4 GRAPH OF WATER HEATING ............................................................................................................ 11
3 IMPORTANT NOTICE ................................................................................................................................ 11
3.1 SAFETY NOTICE ................................................................................................................................ 11
3.2 DISPOSAL OF PACKAGING MATERIAL AND NON-FUNCTIONING PRODUCT.................................... 14
4 INSTALLATION REGULATIONS.................................................................................................................. 14
5 WARRANTY TERMS .................................................................................................................................. 15
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CAREFULLY READ THIS MANUAL BEFORE INSTALLING THE WATER HEATER!
Dear Customer,
The Works Cooperative of Dražice - Machine Plant, Ltd., would like to
thank you for your decision to use a product of our brand.
With this guide, we will introduce you to the use, construction,
maintenance and other information on electrical water heaters.
The product is not intended to be controlled by
a) people (including children) with reduced physical, sensual or mental capacities, or
b) people with insufficient knowledge and experiences unless supervised by responsible person,
or unless properly instructed by such responsible person.
The manufacturer reserves the right for engineering modification of the product. The product is designed
for permanent contact with drinkable water.
It is recommended to use the product in indoor environment with air temperatures from +2 °C to +45 °C
and a relative humidity up to 80 %.
Product’s reliability and safety is proven by tests implemented by the Engineering Test Institute in Brno.
Made in the Czech Republic.
For proper operation, the water heater must be connected to a constant power source.
Installation may only be carried out by the person authorized to do so.
Meaning of pictograms used in the Manual
Important information for heater users.
Abiding by the recommendations of the manufacturer serves to ensure trouble-free operation
and the long service life of the product.
Caution!
Important notice to be observed.
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1 PRODUCT TECHNICAL SPECIFICATION
1.1 PRODUCT DESCRIPTION
Electric non-pressure water flow heater of PTO series is a product the shape design and dimensions of which
determine it to be used both above and under the hand basin, sink, shower, etc. It is suitable for heating
water in households, workshops, medical attendances and anywhere else with the need of instant hot water
withdrawal. It can also be connected to domestic water station (Darling).
ADVANTAGES OF FLOW HEATERS:
- easy operation, easy assembly, and small dimensions
- fast and economic appliance
- heating control light
- instant and continuous hot water withdrawal
- economic and ecologic activator - reduces water and energy consumption
- swivel discharge arm with a pearlator tap or economic shower
- high reliability and safety of operation (increased lifetime of spirals)
- work with operating pressure from 0.08 MPa
- electronic protection of the appliance in emergency situations
- possibility of installation in bathrooms and lavatories in zone 1 - IP protection 25 (above the bathtub
and shower inserts), pursuant to ČSN 33 2000-7-701 (Figure 1)
Tub - side view Tub - floor plan
Figure 1
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1.2 TECHNICAL DATA
TYPE PTO 3.5
PTO 5
PTO 6.5
PTO 8
LOAD PROFILE
XXS
XXS
XS
XS
ENERGY EFFICIENCY CLASS
A A A A
ENERGY EFFICIENCY
%
39
40
ANNUAL CONSUMPTION
OF ELECTRIC ENERGY
kWh
478
475
465
464
NOISE
dB
46
47
FUNCTIONS ONLY IN A LOW
ELECTRICITY TARIFF
no
no
no
no
SMART 0 0 0
0
RATED POWER INPUT
kWh
3.5 5 6.5
8
FUSE PROTECTION
A
20
25
3x 16
3x 16
RATED SECTION OF CONDUCTORS
CU
mm2
Ø 2.5
Ø 2.5
Ø 2.5
Ø 2.5
RECOMMENDED
- FOR HAND BASIN
- FOR SINK
- FOR SHOWER
YES
YES
YES
YES
MIN WATER PRESSURE IN PIPING
bar
0.8
MAX WATER PRESSURE IN PIPING
bar
6
OVERPRESSURE
bar
0
ELECTRIC CONNECTION
1/N/PE ~ 230V/50Hz
3/N/PE ~ 400V/50Hz
IP PROTECTION LEVEL
IP 25
APPROX. WEIGHT OF THE
APPLIANCE
kg
1.6
DIMENSIONS L X W X H
mm
204 x 80 x 175
Table 1
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1.3 OPERATION INSTRUCTIONS
A special low-pressure combination faucet has to be used with this product.
Opening the hot water valve (red) on the combination faucet activates automatically heating of the flowing
water. Turning the heating on is signalled with a red light on the front cover of the heater. Output
temperature is controlled directly by the hot water valve on the combination faucet through water flow
change. Its temperature drops as the flow grows. Closing the hot water valve on the combination faucet
automatically deactivates heating, the signal light goes off and electricity consumption discontinues.
1.4 SAFETY FEATURES OF THE PRODUCT
1.4.1 PRESSURE SWITCH
Shall not close el. circuit if water flow is insufficient.
1.4.2 SAFETY ELECTRONICS
Automatically discontinues water heating for a period necessary if the appliance overheats. Interrupted run
of the heater indicates either failure in following the operation conditions advised by the manufacturer,
or a failure of the heater. The cause of faulty function has to be removed immediately, since there is a risk
of damaging the appliance.
1.4.3 PRESSURE FUSE
Protects from excessive inner water pressure. If this fuse is inactive, water starts flowing out on the rear side
of the heater. If this situation occurs, immediately close both valves of the combination faucet and disconnect
power supply.
Make sure the sieve in the cold water supply to the heater, as well as the pearlator
and shower element are cleaned regularly. If the above components get clogged, water flow
reduces and the appliance will be put out of service until the causes are removed.
All the safety features have to be repaired only by an authorised service shop worker!
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2 ASSEMBLY INSTRUCTIONS
2.1 WATER CONNECTION
Regarding 100 % check by water pressure test, a little amount of water can be left in the heater
which causes no harm.
Coldwater supply is indicated with a blue symbol, and hot water outflow is indicated with a red symbol.
The appliance is connected to a drinkable water supply and is designed for the preparation of hot service
water.
2.1.1 ELEVATED INSTALLATION
1. Flow heater
2. Holder
3. Spiral dive 2 pcs
4. Wall plug, 2 pcs Ø 8
5. Screw fixing the upper cover of the
heater to the holder - 2 pcs, Ø 3.9 x 16
6. Sieve
7. Alligator faucet nut, 2 pcs
8. Sealing, 2 pcs
9. Faucet
10. Rosette
11. Water inlet neck G 1/2"
12. Lower cover
13. Discharge arm with sealing
14. Spray head with sealing and pearlator
15. Security sheet, 2 pcs
Figure 2
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Close the main water inflow. Screw a low-pressure combination faucet with a decorative rosette on the
water inlet neck G 1/2". Seal the threads on the water inlet. Insert sealing rings into the outlet terminals
of the faucet. Loosen 2 screws fastening the cover on the sides of the flow heater so that the thrust
bottoms in the holes on the rear side created a space for sliding in the attached holder. Mount on the
holder. Mount the flow heater preliminary on the combination faucet and evenly tighten the alligator nuts
using wrench No 16. Mark holes for wall plugs on the side. Disconnect the flow heater from the faucet.
Bore the marked holes on the wall with a 8 mm drill bit into the depth of 40 mm. Place the wall plugs
into the hole and fix the holder with two spiral dives. Insert a sieve into the flow heater cold water inlet
marked with an arrow unless this has already been done by the manufacturer. Put the heater on the
fastened holder and tighten the 2 screws on the sides of the flow heater. Connect the combination faucet
by even tightening of the alligator nuts. Before opening the main water closure, unscrew the pearlator
on the drain arm or the shower saver.
First open the cold water valve on the combination faucet to let contaminated water flow
out. Open the hot water valve and bleed the flow heater.
Mount the pearlator on the drain arm only when clean and bled water flows out. After that, the appliance
can be connected to power supply.
2.1.2 LOW INSTALLATION
Figure 3
Close the main water inflow. Fasten the combination faucet under the hand basin or the sink. Connect
the cold water pipe (hose) of the combination faucet to the corner valve of cold water inlet. The corner valve
outlet must have thread 3/8". Mount the flow heater on the wall in the same manner like for the elevated
installation. The inlet and outlet of the heater must be directed upwards. When fixing the heater make
sure the distance for connecting the inlet and outlet pipe (hose) of the combination faucet is sufficient.
Connect the cold water inlet and outlet pipe (hose) of the combination faucet to the heater as indicated
by colour arrows. Before tightening the alligator, nuts insert a sieve in the cold water supply pipe - unless
the manufacturer has already done so. Open the main water lock.
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Proceed in the same way as described for the elevated installation to bleed the heater and
remove impurities from water.
After that, the appliance can be connected to power supply.
2.1.3 FLOW HEATER WITH COMBINATION FAUCET AND SHOWER
Connection - as described for elevated installation
Figure 4
2.1.4 CONNECTION OF WATER - FLOW HEATER WITH COMBINATION FAUCET, SWIVEL ARM
AND SHOWER
Connection - as described for elevated installation
Figure 5
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2.2 CONNECTING THE HEATER TO ELECTRIC NETWORK
Heater - connect to fixed supply.
The appliance must be connected with a protective conductor! Electric installation of heaters
with fixed connection shall only be performed by an authorised firm holding a licence
for works on electric equipments. Correctness of installation must be confirmed
in the warranty certificate. Without that confirmation, the warranty for the product
is not applicable!
Parts that require intervention in the electric part of the appliance shall only be replaced with an authorised
electric service shop! Failing to follow the instructions advised by the manufacturer constitutes cessation
of the title to warranty repair!
2.3 MAINTENANCE INSTRUCTIONS
Maintenance of flow heater is very simple. It is only limited to maintaining its surface cleanliness, checking
the cleanliness of the sieve in the cold water inlet, and cleaning of the pearlator or the shower element.
Pearlator
During cleaning, unscrew the pearlator from the swivel arm. Take the element out and clean the holes of it.
Proceed in the opposite manner to assemble it.
Shower element
When cleaning the shower element, loosen the screw on the front drain surface. Take out individual elements
and clean the flow channels on the periphery of the elements, e.g. using a soft brush. Proceed in the opposite
manner to assemble it.
If, despite the cleaning, the water flow of the heater is lower, you need to clean the screen in the water inlet
to the heater.
Cleaning the screen in the water inlet
First disconnect the appliance using the protection element from the power supply and familiarise other
heater users with its disconnection. Then close the water supply. Dismantle the heater from the wall
and from the water inlet. Clean the screen (sieve) and proceed in the opposite manner to mount the heater
back on.
Protection from freezing and damage due to frost
If the flow heater is mounted at a place with a risk of freezing in winter (e.g. cottages or cabins not occupied
in winter), the appliance has to be dismantled and store it in such manner to avoid its exposure to frost. Pure
removal of residual water in the heating element and labyrinth by blowing through the drain arm
is not enough, and does not protect against damage caused by frost.
If the stated instructions are not followed and the appliance gets damaged by frost, the title
to warranty repair ceases due to improper use of the product.
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Wipe the outer surfaces of the flow heater and the combination faucet with a soft clout damped
in a detergent solution. Do not use aggressive solutions or rough cleaning agents! Let an expert deal with
larger maintenance and repairs!
2.4 GRAPH OF WATER HEATING
Temperature of heated water
The graph shows the dependence of the maximum water flow A [l/min.] on the flowing water temperature
B [°C] for inputs of 3.5 kW, 5 kW, 6.5 kW and 8 kW. The data applies if the inlet water temperature
is 10 °C.
Example: In a type PTO 6.5 heater, water with a temperature of 50 °C will flow out if the inlet water
temperature is 10 °C and a flow rate 2.5 l/min.
Figure 6
3 IMPORTANT NOTICE
3.1 SAFETY NOTICE
The safety instructions contained in this chapter are based not only on the requirements of the EC
standardised standards and guidelines but take into consideration also the general safety of products,
and result from practical experiences of users' behaviour. Consider any analogical or partially variant
information that may occur in the next chapters of the present Manual secondary, and always follow
the instructions stated in this particular chapter!
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- Prior to putting the appliance into operation please read carefully this Service Manual, view
the figures and keep the Manual for further reference.
- Before the first start-up and always after any reassembly to the water supply pipe, or in
the event of an interruption in the supply, bleed the appliances. Proceed as follows: Turn
off the power supply, open the red valve and leave it open until the water from the
instantaneous heater starts to flow pit smoothly. This will bleed the heater which prevents
the appliance from overheating.
- Replacement of components that require intervention in the electrical part of the appliance
may only be carried out by a qualified electrical service shop! Failure to follow the
manufacturer's instructions will void the right to warranty repair!
- Check whether the information on the type plate corresponds with the voltage in your electric
socket.
- Never use the appliance with a damaged supply cord or plug, unless operates properly,
if it fell on the ground and got damaged, or if it fell in water. In such cases take the appliance
to an authorised service shop and get it checked, in order to ensure its safety and proper
functioning.
- The appliance is only designed to be used in households and for similar purposes!
It is an appliance available to general public, designed to be placed in residential
or commercial buildings.
- In order to ensure supplementary protection, we recommend a current protector (RCD)
to be installed in the electric circuit of the bathroom power supply, with rated operating
current within 30 mA. Consult revision technician or electrician, as the case may be.
- Separate electric circuit must be protected for type PTO 3.5 with 16 A circuit breaker at least,
for type PTO 5 with 25 A circuit breaker at least, for types PTO 6.5 and PTO 8 with 3x16 A
circuit breaker at least.
- Electric and water supply installation must comply with valid electrotechnical regulations
and standards.
- The heater must be installed in a non-freezing environment only, otherwise the product
may get damaged. In case of freezing do not start the heater.
- The heater must be permanently connected to fixed supply with an installed device enabling
disconnection of all supply poles (except for the protective conductor), with the minimum
3 mm distance of contacts in open state!
-
Specific water resistance at 15 °C must not drop below 1300 Ohm.cm (requirement
of the ČSN EN
requirement. Get the information on water conductivity at the water supply administrator
or at the hygienic station.
- The minimum and maximum pressure of water in the supply piping must conform
to the values stated in the technical data sheet of the heater.
- The product's IP protection is 25; it can be installed in bathrooms, shower inserts
and lavatories pursuant to ČSN 33 2000-7-701 in zones 1, 2 and 3 (Figure 1).
- The flow heater is protected against spurting water (IP X5).
- Do not cover the discharge outlets! Those outlets serve as ventilation to release water
overpressure during heating. For that reason, minor water dripping occurs during heating.
The dripping cannot be eliminated by tightening the faucet valve! By forced tightening
of the valve you may damage the faucet! This phenomenon with these heater types
is normal and therefore do not consider it a defect.
60335-2-35 standard). Drinkable water generally conforms to the above
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- On the first putting the appliance into operation, unscrew the pearlator on the drain arm,
or the shower adaptor, and open the blue combination faucet valve. With cold water flow
the impurity residues left after the assembly and tightening of the valves will be cleared off
the cold water supply piping. Close the blue valve. Open the red valve and let it open until
the water from the flow heater starts flowing continuously (air removal). After fitting
the pearlator or attaching the shower, the heater can be connected to power supply.
- The flow heater is designed with an open outflow (non-pressure). For that reason, no stop
valve or any other fitting or device shall be connected at the outflow. Use special low-
pressure combination faucets only, and other accessories. These components are also
supplied by the heater manufacturer.
- Should you find out that there is lack of water in the water supply piping, close the hot water
valve immediately to avoid flowing the water from the heater out back into the water
conduit!
- If there is air in the heater (e.g. in case of water supply discontinuation), bleed it similarly
as when assembling the appliance (do not forget to disconnect the heater from the power
supply).
- The flow heater is designed for heating of cold running water only. It shall not be used
for other heating, e.g. by connecting to electric tank etc.
- Check regularly the flow and remove the scale from the pearlator and shower (see
IV Maintenance Instructions).
- The heater must not be submerged under water (not even partially) or installed
in an explosive environment.
- Prevent children and irresponsible people from handling without supervision
of a competent person!
- Do not perform any interventions or repairs of the flow heater as long as it is connected
to power network.
- Let an authorised service shop workers deal with any repairs.
- Avoid mechanical damage of the appliance and damage due to frost.
- The supply pipe must not be damaged by sharp or hot objects or open flame, and must
not be submerged in water.
- Use only undamaged and correct power extension cords.
- If the supply inlet of this appliance is damaged, it has to be replaced by the manufacturer,
its service technician or a similarly qualified person in order to prevent a hazardous situation
from occurrence.
- Never use the appliance for a purpose different from that being defined and described in this
- Manual! Failing to follow the instructions advised by the manufacturer constitutes cessation
of the right for warranty repair.
- The manufacturer shall not be held liable for any damages caused by improper handling
the appliance (e.g. fire, burning, scalding, etc.), and shall not be held liable for warranty
of the appliance should the above safety instructions are not followed.
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3.2 DISPOSAL OF PACKAGING MATERIAL AND NON-
FUNCTIONING PRODUCT
If the dimensions allow so, the symbols of materials used for production of packaging, components
and accessories, as well as recycling symbols, are imprinted on all products. The symbols stated on products
or in the accompanying documentation indicate that the electric or electronic products used shall in no case
be disposed of together with municipal waste. To dispose of the product properly, hand it over at designated
collection points where they will accept it free of charge. You will help to dispose of the product properly
and maintain valuable natural resources, as well as prevent from potential negative impacts on environment
and human health which might be the consequences of improper waste disposal. Seek further details
from local authority or from the nearest collection yard. If this type of waste is disposed of improperly, fines
may be imposed pursuant to national regulations. Should the appliance be put out of service definitely,
the supply inlet should be cut off the power supply once disconnected; thus, the appliance will be useless.
The packaging that the product was delivered in has been paid for in form
of a service fee for the provision of the return and recovery. The service fee was
paid pursuant to Act No 477/2001 Coll., as amended, at EKO-KOM a.s. The client
number of the company is F06020274. Take the water heater packaging
to a waste disposal place determined by the municipality. Disassemble
the discarded and unserviceable product after the operation terminates,
and transport it to a waste recycling centre (collecting yard) or contact
the manufacturer.
4 INSTALLATION REGULATIONS
Both the electric and water installation must follow and meet the requirements
and regulations relevant in the country of use!
The manufacturer shall not be held liable for any damages caused by unauthorised assembly. Should the
product fail, do not hesitate to contact the nearest authorised service shop.
EC Declaration of Conformity was issued for the product, pursuant to Act No 22/1997 Coll., as amended.
The product complies with the requirements of the below government regula
- NV No 17/2003 Coll., which defines technical requirements on low voltage electric appliances
(corresponds with the Council Regulation No 2006/95/EC, as amended).
- NV No 616/2006 Coll., which defines technical requirements on products in terms of their
electromagnetic compatibility (corresponds with the Council Regulation No 2004/108/EC,
As amended).
The manufacturer reserves the right to minor deviations from the standard design that do not affect
the function of the product.
t
i ons, as amended:
30-7-2021
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