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Installation Instructions
Singular Combi Boiler - BTC 439003301 B (2021/07)
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).
The 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.
Figure 92
70 3066 2662 2258 1854 1450 1046 642 38 3468 2864 2460 2056 1652 1248 844 40 36 32
190
122
158
90
174
106
142
182
114
150
82
166
98
130
186
118
154
86
170
102
138
134
178
110
146
78
162
94
126
Setting temperature(°F)
Outdoor temperature(°F)
Radiator
High mass
Cast iron
Fan coil
Low mass
Finned tube
The following table lists the default space heating temperature range by system
heat load and the applicable outdoor temperature ranges.
Heat load
Minimum
set-point
Maximum
set-point
Outdoor
temperature
min-max
Finned tube heat load types 118°F (48°C) 180°F (82°C)
Minimum
outdoor
temperature:
14°F (-10°C)
Maximum
outdoor
temperature:
68°F (20°C)
Fan coil 120°F (60°C) 180°F (82°C)
Cast iron baseboard 100°F (38°C) 170°F (77°C)
Low mass radiant 82°F (28°C) 140°F (60°C)
High mass radiant 82°F (28°C) 122°F (50°C)
Radiator 118°F (48°C) 170°F (77°C)
Custom
User defi ne
Table 26
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