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15.3 Outdoor Reset Control
(Available with Optional Outdoor Temperature Sensor)
The outdoor reset control can be used in order to improve the energy effi ciency.
With the Outdoor Reset Control, the space heating temperature setting
automatically changes according to the outdoor temperature and the current space
heating system application (system load).
T he outdoor reset control can be used only when the outdoor
temperature sensor is installed. In addition, it only works when the boiler
is running in the normal operation mode. It does not work when the
boiler is running in either the Minimum(MIN) or Maximum(MAX) mode,
or When the boiler's front panel displays a fault.
Setting temperature(°F)
190
186
182
178
174
170
166
162
158
154
150
146
142
138
134
130
126
122
118
114
110
106
102
98
94
90
86
82
78
70
68
66
64
62
60
58
Figure 92
The following table lists the default space heating temperature range by system
heat load and the applicable outdoor temperature ranges.
Minimum
Heat load
set-point
Finned tube heat load types
118°F (48°C)
Fan coil
120°F (60°C)
Cast iron baseboard
100°F (38°C)
Low mass radiant
82°F (28°C)
High mass radiant
82°F (28°C)
Radiator
118°F (48°C)
Custom
Table 26
Singular Combi Boiler - BTC 439003301 B (2021/07)
56
54
52
50
48
46
44
42
40
38
Outdoor
Maximum
temperature
set-point
min-max
180°F (82°C)
Minimum
outdoor
180°F (82°C)
temperature:
14°F (-10°C)
170°F (77°C)
140°F (60°C)
Maximum
outdoor
122°F (50°C)
temperature:
170°F (77°C)
68°F (20°C)
User defi ne
36
34
32
30
28
26
24
22
20
18
Installation Instructions
Outdoor temperature(°F)
16
14
12
10
8
6
Radiator
Finned tube
Fan coil
Cast iron
High mass
Low mass
| 59
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