Manual Remeha Celcia MC4 (page 32 of 64) (English, German, Dutch, French)

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Remeha Celcia MC4

LT.AL.REM.000.029

Required output

Data are exchanged between the regulator and the boilers via

the OpenTherm connections. The Celcia MC4 receives the

flow temperature demand from an Celcia 15 or 20 regulator.

In the case of a room thermostat the flow temperature demand

is determined on the basis of the ambient temperature. In the

case of a weather-dependent regulator the flow temperature

demand is determined on the basis of the heat curve and the

outside temperature. The Celcia MC4 transmits the measured

outside temperature to the controlling Celcia 15 or 20 regula-

tor. The required output is determined according to the differ-

ence between the measured flow temperature and the flow

temperature demanded.

The Celcia MC4 distributes this capacity over the (OpenTherm

controlled) boilers connected. A set switching method deter-

mines the distribution.

5.1.3 Switching method

By way of a set switching method the Celcia MC4 deter-

mines when the boiler is switched on and the required output.

The regulator ensures that the boilers are equally loaded by

recording the number of hours each boiler is in operation. The

switching method is such that as the required output increas-

es, the regulator will wait as long as possible (the first boiler

will then operate at 95% of its own capacity) before switching

the second boiler on (after a time delay of 5 minutes). As the

required output decreases, the regulator will wait as long as

possible before switching the first boiler off.

Operating sequence

The sequence in which the boilers are to be switched on and

off, is set during the configuration. It is determined on the

basis on the number of operating hours. The boiler with the

least operating hours is switched on first and the boiler with

the most operating hours is switched on last. The boilers are

switched off in reverse order, so the boiler that was switched

on first is switched off last.

P = required output

Kt = total output

K1 = output boiler 1

K2 = output boiler 2

* This is a global description of the operation. The effect of

part load time, individual power differences etc. are not shown

in this graph.

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Remeha Celcia MC4 Manual

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