Analog Control (0 -10 V Dc) - REMEHA Quinta 115 Technical Information

Change setting mode parameter ( to 00. Set the x value of the boiler control
operation parameter (A) to 1.
Modulating weather-compensated cascade controller
Remeha has a controller set Celcia 20 / Celcia MC4 for this that can be supplied as
accessory.
- Celcia 20; Optimising / weather-compensated boiler control used in conjunction with
the Celcia MC4 for multiple boilers.
- Celcia MC4; This controller uses the demanded flow temperature for modulating
control of the power of 1 to 4 boilers in a cascade, according to an established
switching method. Refer to the documentation of this controller for detailed
information.
This controller set is supplied with outside sensor and flow sensor (used for multiple
boiler installation only.
Communication between the Optimising / weather-compensated control Celcia 20 /
Celcia MC4 and the boiler control system is via the built-in OpenTherm
Set the x value of the boiler control operation parameter (A) to 1.
NOTE: Please refer to the relevant control leaflet for optimising / compensation
settings.

8.4.2 Analog control (0 -10 V dc)

The heat output modulates between the minimum and the maximum value on the
basis of the voltage supplied by an external analog
(0 -10V, volt free) input (terminal connections 1 (gnd) and 2 (+)).
- Temperature based (20 to 90°C) set the x value of the boiler control operation
parameter (A) to 4.
To set the ratio between voltage and the desired flow temperature, see Par. 6.6.15
and the graph below.
- Output based - fixed parameters (16 to 100%), see graph below.
0 V = boiler off
0.5 - 1.8 V
1.8 - 10 V
Set the x value of the boiler control operation parameter (A) to 5.
NOTE: When using an external analog (0 -10V), the factory default 03should be
changed to 00.
= heat input 16%
= boiler modulates between 16 and 100% on demand
45
-interface.
®