Technical Specification Of Product; Function Description; Product Description - Dražice OKC 300 NTR/1MPa Operation And Installation Manual

1 TECHNICAL SPECIFICATION OF PRODUCT

1.1 FUNCTION DESCRIPTION

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.

1.2 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
mm – 750 to 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 1/2" 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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