Drazice OKC 400 NTR/1MPa Manuale - Pagina 2
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Read carefully the below instructions prior to the installation of the
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.
The manufacturer reserves the right for engineering modification of the product.
The product is designed for permanent contact with drinkable water.
Guide Contents
1. USE ......................................................................................................................................................................................... 2
2. PRODUCT DESCRIPTION .................................................................................................................................................. 2
3. IMPORTANT NOTICE ........................................................................................................................................................ 3
4. PUTTING THE HEATER INTO OPERATION ................................................................................................................. 3
5. TECHNICAL DATA ............................................................................................................................................................. 3
6. CONNECTING A HEATER TO A HOT WATER DISTRIBUTION ................................................................................ 4
7. SECURITY EQUIPMENT .................................................................................................................................................... 4
8. SPARE PARTS ...................................................................................................................................................................... 5
9. HEATER CLEANING AND ANODE ROD EXCHANGE.................................................................................................. 5
10. INSTALLATION REGULATIONS.................................................................................................................................... 5
11. CONNECTING A HEATER TO A HEATING SYSTEM ................................................................................................. 5
12. PERFORMANCE DATA .................................................................................................................................................... 7
14. ASSEMBLY GUIDE FOR ZIP-FASTENER INSULATION ............................................................................................ 9
15. CONSTRUCTION HEATER PARAMETERS ................................................................................................................ 10
Environment Type:
It is recommended to use the product in indoor environment with air temperatures from +2°C to 45°C and a
max. relative humidity of 80%.
1. USE
Indirect stationary heaters lines NTR and NTRR are used for water heating in conjunction with another source
of heating water, most often a gas boiler. The NTRR types combine two sources of heating water (gas boiler + a
solar system or a heat pump). Their nominal performance provides sufficient amount of hot water for large flat units,
premises, restaurants, and similar establishments. In case of increased hot water consumption, these tanks heat
water continuously, operating similarly to flow heaters.
2. PRODUCT DESCRIPTION
The heater tank is welded from a steel sheet; it is entirely coated with hot water resistant enamel. Magnesium
anode is added in the vessel as an additional protection against corrosion, which regulates the electric potential of the
inside of the vessel and thus reduces the effects of corrosion. Inside the tank, hot and cold water and circulation
pipes; a thermostat well; and either one or two spiral steel pipe heat exchangers (enamelled on the outside) are all
welded on. The pipe heat exchanger is only intended for the heating circuit.
On the heater side, there is a cleaning and revision opening ending with a 110 mm flange; the clearance including
eight M8 bolts is 150 mm - 300 to 500 litres, for 180 mm clearance the spacing of ten bolts is 225 - 750 o 1000
litres. A heating unit with various output containing an operating and safety thermostat can be mounted in the
opening. The NTR series heaters are equipped with a G 1 ½ " aperture for in-screwing an additional heating element.
Such version is used when the heater is connected to either a solar system or a system with a heat pump, to heat
water in the upper part of the heater to the temperature required. The tank is insulated with 50-80 mm of
polyurethane freon-free foam. The tank shell is made of a steel sheet painted with a powder coating (the 400-500 L
types only; other are in plastic) and the connecting parts are metal-coated.
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