TANK-TYPE WATER HEATER FOR VERTICAL MOUNTING
Electric water heaters
4 kW/400 V
|OKCE 200||OKHE 80
CAREFULLY READ THIS MANUAL BEFORE INSTALLING THE WATER HEATER!
Družstevní závody Dražice – strojírna s.r.o., 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 a responsible person, or unless properly instructed by such a responsible person.
The manufacturer reserves the right to engineering modification of the product. The product is designed for permanent contact with drinkable water.
It is recommended to use the product in an indoor environment with air temperatures from +2 °C to +45 °C and relative humidity of up to 80 %.
The product’s reliability and safety are proven by tests implemented by the Engineering Test Institute in Brno.
Made in the Czech Republic.
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.
Important notice to be observed.
PRODUCT TECHNICAL SPECIFICATION
Tank type water heater (the heater hereinafter) is designed for the accumulation heating of service water by electric energy. Water is heated by an electric element in an enameled thermally insulated tank at the time defined by the power supplier. The element is at the time of heating controlled by a thermostat the temperature of which can be adjusted continuously (within the range between 5 °C and 75 °C). Once the selected temperature is reached, heating interrupts automatically. Water accumulated in the tank is then used for consumption. The tank keeps constant pressure of water from the water main. If the combination faucet hot water valve is opened, water from the water supply conduit pressed out by cold water pressure flows out of the heater. Hot water flows out through the top part, and water flowing in remains in the bottom part of the heater. The pressure principle allows hot water withdrawal at any place from the heater.
ADVICE FOR CUSTOMERS
HOT WATER CONSUMPTION
Consumption of hot water in households depends on the number of people, amount of sanitary equipment, length, diameter, and insulation of piping in the flat, or on individual habits of users. The cheapest option of water heating comes at a time when the electricity rate is reduced.
Find out in what time intervals your electricity supplier provides reduced tariff and, depending on that information, select the relevant volume and power input of the heater so that your hot water consumption covered the needs of your household.
The heater is insulated with quality polyurethane Freon free foam. Set the temperature of the heater’s thermostat to that level only that you need to run your home. Thus you will reduce electricity consumption, as well as the number of lime sediments on the walls of the receptacle and on the electric body.
EMERGENCY POWER CONSUMPTION
According to current legislation, the standby consumption is stated in the value of annual consumption of electric energy (kWh), which is measured according to the corresponding load profile and calculated according to the formulas and requirements of EU Regulation No. 812/2013.
|MAX OPERATING OVERPRESSURE IN THE TANK||bar||6|
|ELECTRICAL CONNECTION||3/N/PE – 400V/50Hz|
|RECOMMENDED BREAKER||3×10 A|
|EL. PROTECTION||IP 44|
TEMPERATURE OF HOT WATER (HW)
|RECOMMENDED HOT WATER (HW) TEMPERATURE||°C||60|
|HEIGHT OF THE HEATER||mm||757
|HEATER DIAMETER (only OKCE)||mm||524||524||524||524||584|
|THE HEATER DIMENSION width x depth
|MAX WEIGHT OF THE HEATER WITHOUT WATER||kg||33
|TIME OF EL HEATING FROM 10°C TO 60°C*||hrs||1.1||1.4
|MIXED WATER V40||I||138.70
|ENERGY EFFICIENCY CLASS||C||C||C||C||C|
|ANNUAL CONSUMPTION OF ELECTRIC ENERGY||kWh||1342
DESIGN AND GENERAL HEATER DIMENSIONS
The heater tanks are made of a steel plate and tested by 1.5 multiple of the operating pressure values. The inside of the receptacle is enameled. A flange is welded onto the bottom of the tank with a flanged lid screwed to it. A sealing ring is inserted between the flanged lid and the flange. Thermowells for placing a heating element, thermostat sensors, and safety fuses are located in the flanged lid. An anode rod is mounted onto the M8 nut. Electric wiring is placed underneath the plastic removable cover. Description of basic parts of the heater – Figure 1. Heater dimensions – Figure 2 and Table 2, Figure 3 and Table 3.
- Temperature indicator
- Heating element well
- Ceramic heating element 4000 W
- Service thermostat with an external control and safety pipe
- Electric installation cover
- Coldwater supply pipe
- Hot water withdrawal pipe
- Mg anode
- Enamelled steel receptacle
- Polyurethane insulation
- Heater shell
OKCE 80, OKCE 100, OKCE 125, OKCE 160, OKCE 200
Upper and lower Hinge 200 l
Upper hinge 50 – 160L
|OKCE 80||OKCE 100||OKCE 125||OKCE 160||OKCE 200|
OKHE 80, OKHE 100, OKHE 125, OKHE 160
|OKHE 80||OKHE 100||OKHE 125||OKHE 160|
OPERATION AND FITTING INSTRUCTIONS
The tank shall only be used in accordance with the conditions specified on the power plate and in instructions for electric wiring. Besides legally acknowledged national regulations and standards, also conditions for connection defined in local electric and waterworks have to be adhered to, as well as the installation and operation manual.
The temperature at the place of heater installation must be higher than +2 °C, and the room must not freeze. The appliance has to be mounted at a convenient place, it means that the appliance must be easily available for potential necessary maintenance, repair, or replacement, as the case may be.
If water is strongly calcareous we recommend that any of the common decalcifying devices be installed with the appliance, or that the thermostat is set to the minimum operating temperature of 55 °C (setting to position „OPTIMUM“) – Figure 11. For proper operation, drinkable water of adequate quality shall be used. To avoid potential sediments, we recommend that the device be installed together with a water filter.
Prior to the mounting check the bearing capacity of the wall and the material it is made of, considering the weight of the heater filled with water. Depending on the wall material choose adequate fixtures. We recommend entrusting wall mounting and anchoring to a specialist company or consulting the suspension with a building specialist. When mounting the anchor bolts follow the guide provided by the anchor bolts manufacturer.
Mount the anchors by the dimensional drawing (Figure 2, Figure 3) in 450 mm spacing. The heater verticality after the release of the connecting screws can be aligned by means of slight turning. Double-check the torque of the suspension bolts on the heater and suspend the heater. Using the detent support in the bottom part of the heater make sure it runs in parallel with the wall at the heaters OKHE 80-160 l!
The use of the suspension even for the screw spacing during the replacement with a heater of another type.
The heater verticality after the release of the connecting screws can be aligned by means of slight turning.
If the hot water heater is mounted in a tight, small space, or in an intermediate ceiling, etc., you have to make sure that the connecting side of the appliance (connections to water supply, area for electric plugging) remained accessible and no heat accumulation occurs. Free space of up to 600 mm from the bottom edge of the heater has to be available under the heater. When mounted directly under the ceiling, the distance from the ceiling has to be 50 mm at least.
If the water heater is mounted in enclosed areas, inter-ceilings, built-in structures, and recesses ensure sufficient access to service fittings, electrical terminal boards, anodes, and manholes. The minimum spacing from the manhole is 600 mm.
The heater connects to water distribution tubes with G 3/4” thread in the bottom part of the heater. Blue – cold water supply, red – hot water outlet. For potential disconnection of the heater, the service water inlets and outlets must be provided with screw coupling Js 3/4”. The safety valve is mounted on the cold water inlet identified with a blue ring.
The heater must be equipped with a membrane, spring-loaded safety valve. Safety valves with fixed pressure settings from the manufacturer are used for the assembly. Each individually lockable heater must be fitted with a cap on the cold water inlet, a test valve, or a stopper to check the operation of the check valve, with a check valve and a relief valve (Figure 6). The safety valve with a check valve is supplied with the heater.
It is necessary to check the safety valve each time before putting it into operation. It is checked by the manual moving of the membrane from the seat, turning the make-and-break device button always in the direction of the arrow. After being turned, the button must click back into a notch. Proper function of the make-and-break device results in water draining through the safety valve outlet pipe. In common operation, such a check needs to be implemented at least once a month, and after each heater is shut down for more than 5 days. Water may be dripping off the drainpipe of the safety valve; the pipe must be open into the air, pointed down; environment temperatures must not drop below zero.
Find necessary pressure values below. (Table 4)
Heaters must be provided with a discharge valve mounted on the cold service water inlet to the heater for potential disassembly or repair. When assembling the security equipment, follow the standard.
|SAFETY VALVE START-UP PRESSURE [MPa]||ALLOWABLE OPERATING OVERPRESSURE OF WATER HEATER [MPa]||MAXIMUM PRESSURE IN COLD WATER PIPES [MPa]|
|0.6||0.6||up to 0.48|
TANK TYPE ELECTRIC WATER HEATER
HOT WATER DISTRIBUTION
GENERAL INFORMATION FOR ELECTRICAL INSTALLATION
Perform the connection according to the scheme. Factory connection must not be changed! (Figure 9). In the electric wiring, the casing removes the partition corresponding with the input wire diameter Ø8 or Ø10 (Figure 8). The degree of protection of electric parts of the heater is IP 44. The power input of the electric element is 4,000 W.
It is necessary to observe the below requirements during the electric wiring.
- The electric wiring scheme is attached to the water heater on the side of the electric installation guard (Figure 9)
- Connection, repairs, and wiring inspections may only be implemented by a company (person) authorized for such activity.
- The expert connection must be confirmed on the warranty certificate.
- The heater is connected to a 3 PE-N ~ 400V/50 Hz power supply via a fixed movable wire.
The circuit must contain a circuit breaker (protector).
- Installations in bathrooms, laundry rooms, restrooms, and showers, must be in compliance with standards.
- The degree of protection of electric parts of the heater is IP 44.
- Adhere to the protection against electric shock injury according to standard.
After the heater is connected to the electric network, the heating element starts heating water. The element is turned on and off by a thermostat. After reaching the temperature set, the thermostat switches off the electric circuit and discontinues water heating. The control light signals if the element is in operation (light is on) or if it is off (the light goes out). In case of longer operation without using the heated volume, the thermostat has to be set to position 5 °C to 10 °C (set the “snowflake” symbol on the thermostat selector) to avoid its freezing, or the electricity supply to the heater has to be switched off.
Before opening the power supply, the tank must be filled with water. The process of first heating must be executed by a licensed professional who has to check it. Both the hot water outlet pipe and safety armature parts may be hot.
During the heating process, the pressurized connection water that increases its volume due to heating must drip off the safety valve. In a non-pressurized connection, water drips off the overflow combination faucet. When heating is finished, the set temperature and the actual temperature of consumed water should be roughly equal. After connecting the heater to the water main and electrical power system, and after checking the safety valve (following the instructions attached to the valve), the heater can be put into operation.
Before first putting into service or after a longer shutdown the appliance has to be rinsed out and flushed yet before heating is activated. Before heating starts, the tank must be completely filled with water and the system properly flushed and vented. First heating of the tank has to be watched.
The procedure of putting the heater into operation:
- Check the water main and wiring. Check the proper placement of operating and safety thermostat sensors. The sensors must be inserted all the way in; first the operating and then the safety thermostat.
- Open the hot water valve on the combination faucet.
- Open the cold water inlet valve to the heater.
- As soon as the water starts running through the hot water valve, the heater is filled, and the valve can be closed.
- In case of leakage (of the flanged lid), we recommend that the flange lid bolts are fastened.
- Screw down the electric installation guard.
- When hot service water is heated by electric energy, switch on the power supply.
- When commencing operation, flush the heater until the cloudiness in the water is gone.
- Make sure to fill in properly the warranty certificate.
PUTTING OUT OF SERVICE, DISCHARGE
If the hot water heater is put out of service for a longer time, or if it is not going to be used it has to be drained and disconnected from the electric supply network. The switch for the supply lead or the fuse cut-outs has to be shut off.
At places, with a permanent risk of frost, the hot water heater must be drained before the cold season starts if the appliance remains out of service for several days and if the power supply is disconnected.
Drainage of service water shall be performed after closing the shut-off valve in the cold water supply piping (through the discharge valve for safety valve combination) and with simultaneous opening of all hot water valves of connected fittings (water can be also drained through the safety valve; for that purpose, the safety valve is turned to the “Check” position). Hot water may outflow during the drainage! If there is a risk of frost it has to be considered that not only the water in the hot water heater and in the hot water piping may get frozen but also the water in the entire cold water supply piping. It is therefore advisable to drain all fittings and piping that carry water, up to the part where the house water meter is installed (connection of the house to water main) which is not jeopardized by frost. When the tank is to be used again, it has to be filled with water and one needs to make sure that the water flowing out at the hot water valves did not contain any bubbles.
INSPECTION, MAINTENANCE & CARE FOR THE APPLIANCE
During the heating process, the water that increases its volume during the heating must visibly drip off the safety valve outlet (in a non-pressurized connection this water drips off the combination faucet valve). In full heating (about 75 °C) the volumetric water gain is approx. 3 % of the tank capacity. The function of the safety valve has to be checked regularly. If the safety valve control knob is lifted or turned to the “Control” position, the water must flow out easily, without any obstacles, from the safety valve element to the outfall line. In common operation, such a check needs to be implemented at least once a month, and after each heater is shut down for more than 5 days.
Attention! In doing so, the cold water supply pipe and the connection fitting of the tank may get heated! If the hot water heater does not work, or if hot water is not withdrawn, no water shall drip off the safety valve. If water drips, then the water pressure in the supply piping is either too high (if higher than 4.8 bars, a pressure control valve has to be fitted), or the safety valve is defective. Please call a specialized plumber immediately!
If the water contains too many minerals, an expert has to come to remove the scale that forms inside the tank, as well as free sediments. This has to be performed after one or two years of operation. The cleaning is carried out through the hole in the flange – dismantle the flanged lid and clean the tank. A new sealing has to be used for re-fitting. Since the inside of the heater has special enamel, which must not get in contact with the scale removing agent – do not work with a lime pump. Remove the lime layer with timber and suck it off or wipe it off with clout. After that, the appliance must be rinsed thoroughly, and the heating process is checked the same as during the initial putting in operation. Do not use any abrasive cleaning agents (such as liquid sand, chemicals – acid, alkaline) or dye thinners (such as cellulose thinner, trichlor, and the like) to clean the outer shell of the heater. For cleaning use wet clout and add a few drops of liquid cleaning agent for household applications. Repeated heating causes limescale to settle on the receptacle walls and mostly on the lid of the flange. Limescale settling depends on the hardness of heated water, its temperature, and on the volume of hot water used.
We recommend checking and cleaning the tank from scale and eventual replacement of the anode rod after two years of operation. The anode life is theoretically calculated for two years of operation; however, it changes with water hardness and chemical composition in the place of use. Based on such an inspection, the next term of anode rod exchange may be determined. If the anode is only blocked with sediments clean its surface and, if used up, mount a new one. Have a company in charge of service affairs deal with the cleaning and exchanging of the anode. When draining water from the heater, the combination faucet valve for hot water must be open, preventing the occurrence of under-pressure in the heater tank which would stop the water from draining.
MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES
|Water is cold||• Light on||• The temperature set on the thermostat is too low; heating element failure|
|Water is cold||• Light off||• No supply voltage!
• Thermostat failure
• Safety thermostat shut off probably due to failed operation thermostat
|The water is not warm enough||• Light on||• Failure of one of the coils in the element (3x 1350 W)|
|The temperature of water is not corresponding with the temperature set on the control||• Defective thermostat|
|Water is constantly dripping off the safety valve||• Light off||• High input pressure
• Defective safety valve
Do not attempt to repair the failure yourselves. Seek either expert or service help. It does not take much for an expert to remove the defect. When making a repair appointment, report the type and serial number you find on the performance plate of your water heater.
OPERATION OF THERMOSTAT
Electrical installation cover for heaters OKCE and OKHE
The thermostat and no other part of the control panel is not a bearing part that can be used for any handling with the heater.
Water temperature is set by turning the thermostat knob. The desired symbol is adjusted against the fixed point on the control panel (Figure 11).
- Without a confirmation of performed electrical installation issued by an authorized company, the warranty certificate shall be void.
- Check and exchange the Mg anode regularly.
- You have to apply for approval from a local power supplier to connect the heater.
- No stop valves can be put between the heater and the safety valve.
- If the overpressure in the water main exceeds 0.48 MPa, a pressure control valve must be mounted before the safety valve.
- All hot water outputs must have a combination faucet.
- Before filling the heater with water for the first time, it is recommended to fasten the flange connection nuts of the tank.
- It is not allowed to handle the thermostat, aside from temperature resetting with a control button.
- All-electric installation handling, adjustment, and replacement of the regulation elements shall only be performed by an authorized service company.
- The thermal fuse must not be turned off! In the case of a thermostat defect, the thermal fuse interrupts electric power input to the heating element if the water temperature in the heater exceeds 90 °C.
- If you don’t use the heater (hot water tank) for longer than 24 hours, or if the facility with a heater is unattended, close the cold water inlet to the heater.
- The heater (hot water tank) shall be used exclusively in accordance with the conditions specified on the performance plate and in the instructions for electric wiring.
- The recommended operating pressure in the hot water circuit is 0.48 MPa. At the hot water discharge, we recommend that a reverse flap and an expansion tank are installed (at least 4% of hot water volume in the manifold) to eliminate reverse pressure shocks.
Both the electric and water installation must follow and meet the requirements and regulations relevant in the country of use!
TRANSPORT & STORAGE INSTRUCTIONS
The device shall be transported and stored in a dry place and protected from weather effects with a temperature range from -15 to +50 °C. During loading and unloading, the instructions stated on the packaging shall be observed.
DISPOSAL OF PACKAGING MATERIAL AND NONFUNCTIONING PRODUCT
A service fee for providing return and recovery of packaging material has been paid for the packaging in which the product was delivered. 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 boiler packages to a waste disposal place determined by the town. When the operation terminates, disassemble and transport the discarded and unserviceable heater to a waste recycling center (collecting yard), or contact the manufacturer.
The product is supplied with a safety valve and temperature indicator. The variant OKHE has, in addition, rectifying (delimiting) screw M8 only with the OKHE variant, fan mat Φ 8.4 – 2pcs, and nuts M8. The above parts are packed and placed in the packaging in the top part of the heater.
It is in your own interest to check the completeness of the accessories.