Modulating Controls General; 8.6.3 Bms Analog Control (0-10 Volt Dc) - REMEHA Gas 310 ECO Technical Information

8.6.2 Modulating controls general (two wire control)
To make full use of the boiler's modulating feature, an
OpenTherm or a rematic
®
These controls will provide optimised time and weather
compensation to achieve maximum efficiency and mini-
mum boiler cycling whilst maintaining design condition
within the building. An optional OpenTherm
ic interface must be integrated in the boiler control
®
box.
A. OpenTherm
®
Celcia 20 - An optimising/ weather-compensated boiler
control for single boilers. This compensator can regulate
the boiler output against outside weather conditions, and
provide time and temperature control over the DHW.
The compensator is mounted in a reference room (uses
an internal sensor to monitor room temperature) and is
interfaced to communicate with the boiler's controls via
the two wire serial interface. On site connection of the
supplied outside and common flow sensors complete
the installation. Set the x value of the boiler control
operation parameter A to 1.
Note: Please refer to the relevant control leaflet for opti-
mising/ compensation settings.
B. rematic ® modulating multiple boilers controller
rematic 2945 C3 K - An optimising/ weather-
®
compensated boiler control for multiple boilers (up to a
max of 8). This compensator can regulate the boiler
output against outside weather conditions, and pro-
vide time and temperature control over the DHW. The
compensator is mounted in one of th e boilers and is
interfaced to communicate with the boiler's controls via
the supplied adapter. On site connection of the supplied
outside and common flow sensors complete the instal-
lation. Set the x value of the boiler control operation
parameter A to 1.
Note: Please refer to the relevant control leaflet for opti-
mising/ compensation settings.

8.6.3 BMS Analog control (0-10 Volt DC)

Input resistance R = 66 kW.
in
The heat output modulates between the minimum and
the maximum value on the basis of the voltage supplied
by an external analog (0-10V) input. To control the boiler
with an analog signal, the signal has to be connected on
terminals X29-11 (+) and X29-12 (-) of the terminal strip
in the instrument panel.
Important!!!
g
When analog control is opted, the
on/off-contact and the high/low-contact have higher pri-
ority (e.g. frost protection).
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 tempera-
ture (see par. 13.2.5 and fig. 21).
0 to 0.9 Volt = boiler off
= Flow temperature set point 10 °
1 Volt
= Flow temperature set point 80 °
8 Volts
62560.indd 26 62560.indd 26
control can be connected.
®
® or remat-
Gas 310 ECO
fig. 21 Temperature control via analog (0-10 Volt)
signal
Output based - fixed parameters (20 to 100%), Set the
x value of the boiler control setting parameter A to 5
(see fig. 22).
- 0 to 1.9 Volt = boiler off
- 2 Volt - 10 Volt = boiler modulates between 20
fig. 22 Output control via analog (0-10 Volt) signal
8.6.4 On/ off control (1 x no volt switched pair)
The heat output modulates between the minimum and
the maximum value based on the set flow temperature,
terminal connections X29-9 and X29-10.
Set the x value of the boiler control operation param-
eter A to 3 (on/ off).
26
Remeha
and 100% on demand.
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