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Installation Instructions
Singular Combi Boiler - BTC 439003301 B (2021/07)
When you set ON for C7 and press the MODE button, C8 and “1” will be
displayed repeatedly.
You can set a value from 0 to 6 using the
and
buttons. (The
factory default value is 1.) The meaning of each number is as follows.
Figure 70
Outdoor reset heat load types
0: Finned tube heat load types
1: Fan coil
2: Cast iron baseboard
3: Low mass radiant
4: High mass radiant
5: Radiator
6: Custom
The set temperature for each heat load type is as follows.
Heat load
Minimum
set-point
Maximum
set-point
Out temperature
Min-maximum
Finned tube heat load types
118°F (48°C)
180°F (82°C)
Minimum out
temperature:
14°F(-10°C)
Maximum out
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 19
When “6”(custom mode) is set for C8, the user can set the temperature.
By pressing the MODE button, the user can enter modes such as C9, CA, Cb, and
CC, and can set the temperature.
The content of each mode is as follows:
Custom setting: lowest space heating temperature
Display
Description
Temperature range:
82°F (28°C) – 118°F (48°C)
Table 20
Custom setting: highest space heating temperature
Display
Description
Temperature range:
122°F (50°C) – 180°F (82°C)
Table 21
Custom setting: lowest outdoor temperature
Display
Description
Temperature range:
-4°F (-20°C) – 32°F (0°C)
Table 22
Custom setting: highest outdoor temperature
Display
Description
Temperature range:
34°F (1°C) – 86°F (30°C)
Table 23