Technical Specification Of Product; Function Description; Product Description - Dražice OKC 200 NTRR Operation And Installation Manual

1 TECHNICAL SPECIFICATION OF PRODUCT

1.1 FUNCTION DESCRIPTION

The OKC 200, 250, 300 NTRR/SOL a OKC 400, 500 NTR,R/SOL water heaters are designed and manufactured
as a part of 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.

1.2 PRODUCT DESCRIPTION

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".
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 NTR and 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 placed on the ground, next to the heating water source, or in its vicinity. All
connecting distributions must be properly insulated from heat.
The OKC 200 – 500 NTR, R/SOL 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.
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