MCA
Pro
45/65/90/115
MCA-Pro ISM Rv.4.1 2/2017
56
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
p1
Supply temperature (maximum)
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
.
°C °F
°C
°F
68
50
32
14
-4
194
158
86
50
01
02
0
-20
-10
10
30
70
50
90
F
122
4. Installation
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