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4. Installation
4.9.6. Connecting the outdoor temperature sensor
Ba Outdoor sensor
In accordance with the United States Energy Policy and
Conservation Act, an outdoor sensor is supplied
with the boiler. Where there is an on/off thermostat
controller, the boiler will control the temperature with
the set point of the internal heating curve.
i
An OpenTherm controller can also use this
outdoor sensor. The heating curve required
must then be set on the controller.
Low voltage wiring
i
All wiring must be NEC Class 1. If any of the
originally supplied boiler wiring needs to be
replaced, use only wire with a TEW 105°C or
equivalent designation.
The boiler has to be electrically grounded as
required by the latest National Electrical Code
ANSI/NFPA 70.
Heating curve setting
F Factory setting
Outdoor temperature
Supply temperature
Supply temperature (maximum)
p1
p25 Supply temperature (minimum)
p26 WWSD (Warm Weather Shutdown)
p27 Outdoor temperature (default)
If an outdoor temperature sensor is connected, it is
possible to adjust the heating curve. The setting can
be modified using parameters p1, p25, p26 and
p27.
56
-20
-4
MCA Pro 45/65/90/115
°C °F
90
194
70
158
F
50
122
30
86
10
50
-10
01
02
14
32
50
MCA-Pro ISM Rv.4.1 2/2017
0
°C
68
°F
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