KEY UMS-4PS, Руководство по эксплуатации

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The ratio of the weather characteristics inclination [cF40] – the parameter
determines the temperature of water in the central heating system when it is 0°C
outside. In the graph (picture 2) the relation between the outside temperature and the
temperature of water in the central heating system for ten examples of parameter
settings [cF ] has been shown.
Adjusting the weather characteristics of central heating circulation [cr 0] – the
parameter determines by how many degrees the programmed temperature of central
heating water, calculating on the weather characteristics, will be revalued.
The minimum temperature of central heating circuit [cL20] – this parameter
defines the minimum temperature of water in the central heating circuit. If the
temperature calculated from the weather curve, after shifting the curve by the heating
curve offset [cr 0], will be lower than this minimum temperature, then the target heating
circuit temperature willl be raised to the minimum temperature set by this parameter.
The maximum temperature of central heating circulation [cH75]] – the parameter
defines the maximum programmed temperature of water in central heating circulation.
If temperature calculated on the weather characteristics, after considering the heating
curve change by value [cr 0], exceeds the maximum temperature, then the
programmed temperature of the central heating circulation will be limited to the value
set in this parameter. Protection from excessive increase of central heating circulation
temperature is of considerable significance in case of underfloor heating where the
temperature should not exceed 50°C.
CAUTION! Additional guard protecting installation from excessive rise of temperature
should be used in underfloor heating systems regardless of the maximum program-
med temperature.
4.3 Mixing valve servomotor working parameters.
Hysteresis of mixing valve servomotor working [ch 2] – the mixing valve
servomotor is stopped after achieving the programmed, calculated on the weather
characteristics, temperature of water in central heating circulation. When the rise in
temperature of water in central heating circulation is continued, the regulator closes
the mixing valve. The parameter determines the value by which the temperature of
central heating circulation needs to fall below the programmed one, so that the
regulator could proceed to open the valve.
Duration of pulse controlling the mixing valve actuator [cP 2] – the parameter de-
fines the period of time during which the mixing valve is turned on when being opened
or closed. When fast actuators are applied, setting the short time control pulse is re-
commended.
Interval between impulses transmitted to control the servomotor [t 20] – the
parameter determines the pause between impulses controlling the mixing valve
servomotor. The duration of the steering pulse is constant and equals 2 seconds. In
case of using fast servomotors, a longer break is recommended. Changing the
parameter to [t---] allows the servomotor to work continually.