Connection Options For The Expansion Pcb - If-01 - REMEHA GAS 120 ACE Series User Manual

5 Installation
Fig.40 IF-01 PCB
1
%
2
IF-01
X1
Fig.41 Switch jumper (2)
1
2 %
28 MID _HMI T-control - Gas 120 ACE
5.3.21
The expansion board IF-01 is pre-installed in the instrument box as
standard.
X5
X4
AD-0000054-01
If the boiler locks out, a relay is de-energised and the alarm can be
transmitted via a potential-free contact (maximum 230 V, 1 A) on terminals
Nc and C of the connector.
The interface uses OpenTherm to communicate with the boiler control
unit. To make this possible, the OTm connection must be connected to the
OpenTherm input of the boiler control unit.OTm
A choice can be made with this control between control based on
temperature or heat output. The two controls are described briefly below.
Tab.3
The 0–10 V signal controls the boiler supply temperature. This control
modulates on the basis of flow temperature. The output varies between
2 2 the minimum and maximum value on the basis of the flow temperature set
point calculated by the controller.
A jumper (2) on the interface is used to select either temperature-based
control ( ) or output-based control (%).
Tab.4
AD-0000055-01
Caution
If possible, use the pump modulation signal. This provides the
most accurate pump control.
If the automatic burner unit does not support pump modulation,
the pump will behave as an on/off pump.

Connection options for the expansion PCB - IF-01

Caution
Do not connect a frost thermostat or room thermostat to the boiler
if using the 0–10 V control PCB.
Connecting the status relay (Nc)
Connection (OTm)
Analogue input (0-10 V)
1. Connect the input signal to terminals 0–10 of the connector.
Temperature-based control (°C)
Jumper 2 Input signal (V)
0–1.5
1.5–1.8
1.8–10
Control based on heat output
Jumper 2 Input signal (V)
0–2.0
(1)
%
2.0–2.2
(1)
2.0–10
(1)
(1) Dependent on the minimum modulation depth (set speeds, standard 20%)
Temperature °C Description
0–15 Boiler off
15–18 Hysteresis
18–100 Desired temperature
Heat output (%) Description
0–20 Boiler off
20–22 Hysteresis
20–100 Desired heat output
7717201 - v03 - 25062019