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4. Installation
4.10.2. Connection options for the 0-10 V control
PCB (IF-01)
The IF-01 control PCB can be built into the instrument
box or the housing for the control PCBs. Refer to the
instructions supplied with the product.
CAUTION
Do not connect a frost thermostat or room
thermostat to the boiler if using the 0-10 V control
PCB.
Connection status (Nc)
If the boiler locks out, a relay is de-energised and the
alarm can be transmitted via a potential-free contact
(maximum 120 VAC- 1A) on terminals Nc and C of the
connector.
Connection (OTm)
The interface communicates with the boiler control via
OpenTherm. The OTm connection must be connected
to the OpenTherm input OT of the boiler control.
Analogue input (0-10 V)
This control can be based on temperature or heat
output. The two controls are described briefly below.
For analogue control, the 0-10 V signal must be
connected to the interface.
Analogue temperature-based control (*)
The 0 - 10 V signal controls the boiler supply
temperature between 32ºF/0ºC and 212ºF/100ºC. This
control modulates on the basis of supply temperature,
whereby the heat output varies between the minimum
and maximum values on the basis of the supply
temperature set point calculated by the controller.
A jumper (2) on the interface is used to select either
temperature control () or heat output control (%).
Jumper 2
Input signal
(V)
0-1.5
1.5-1.8
1.8-10
60
Temperature
Description
ºF/ºC
32-59/
Boiler off
0-15
59-64.4/
Hysteresis
15-18
64,4-212/
Temperature
18-100
required
MCA Pro 45/65/90/115
MCA-Pro ISM Rv.4.1 2/2017
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