Drazice OKC 250 NTRR/SOL Manuale di funzionamento e installazione - Pagina 3
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1. USE
The OKC 200, 250 & 300 NTR/SOL and OKC 400, 500 NTR,R/SOL water heaters are designed and manufactured as
a part of a solar system containing additional integral elements of the system, such as sun collectors and their roof
holders (flat roof stands), expansion tank, collector filling distribution and other items necessary for proper and
trouble-free function of a solar system.
Their nominal performance provides sufficient amount of hot water for flat units, premises, restaurants, and similar
establishments.
For final heating (reheat) of HSW, electricity, various types of central heating boilers and combination of those can be
chosen.
2. BASIC VARIANTS PRODUCED
OKC NTR/SOL -
Stationary heater with one coil exchangers for heating HSW with heating water from a single
source. Reheat can be carried out by the boiler in the top exchanger, e.g. by the boiler and also
by the electric element TJ 6 / 4".
OKC NTRR/SOL -
Stationary heater with two coil exchangers for heating HSW with heating water from two
sources. Reheat can be carried out by the boiler in the top exchanger, e.g. by the boiler and also
by the electric element TJ 6 / 4".
3. PRODUCT DESCRIPTION
The heater tank is welded from a steel sheet; the exchangers from a steel tube and, as a unit, it is entirely coated
with hot water resistant enamel. For additional corrosion protection a magnesium anode is mounted in the upper part
of the heater to adjust the electric potential inside the tank, reducing the risk of corrosion. This anode can be
exchanged with titanium anode which is fed with electricity and stable (it need not be exchanged in two years of the
tank's operation as the magnesium anode). All types have welded on outlets of hot and cold water, a circulation
opening and thermo-wells. The tank is insulated with polyurethane Freon-free foam of 50 mm thickness. The heater
shell consists of a plastic container, the connecting parts are metal coated. The entire heater stands on three
rectification screws with a possibility of levelling floor unevenness within the range of 10 mm. Under the plastic cover
on the side of the 300 litre heater, there is a cleaning and revision opening ended with a flange. The NTRR series
heaters are equipped with a 6/4" aperture for in-screwing an additional heating element of TJ 6/4" series. The heater is
to be placed on the ground.
The OKC 200 - 500 NTRR/SOL heaters are indirect heaters designed for preparation of hot service water by means of
a solar system.
The NTRR version is equipped with two exchangers for an optional combination of a solar system and an additional
indirect circuit (e.g. gas boiler).
A heating element can be mounted, as well.
Placement and environment type:
The heater is placed on the ground, next to the heating water source, or in its vicinity. All connecting distributions
must be properly insulated from heat.
It is recommended to use the product in an indoor environment with air temperatures from +2 to 45°C and a maximum
relative humidity of 80%.
NOTICE
We would like to emphasise that the heater must not be connected to power supply if work involving flammable
liquids (petrol, spot remover) or gases, etc., is performed nearby.
Caution!
300, 400, 500 litre capacity heaters are screwed onto the bottom wooden palette with M12 screws. When the heater is
released from the palette and prior to its putting into operation, 3 screw legs supplied as the product accessories have
to be installed. With these adjustable legs, the heater may be positioned vertically to the base, within 10 mm.
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