Boost Mode; Maximum Outdoor Temperature - Rinnai I Series Installation And Operation Manual

Boost mode allows the boiler to override the target temperature determined by the outdoor reset
control, and will boost the boiler target temperature to the setting of Parameter 01 after a
continuous run time or an interval as selected in Parameter 02. The boost function is active until the
call for heat is satisfied or the boiler cycles off.
Boost mode works when the outdoor sensor detects higher outdoor temperatures than expected.
For example: In the case of selecting curve 1 on parameter number
02
number , outdoor temperature is 51°F, and supply temperature is 140°F. When the boiler
continues operating with firing for 30 minutes, the target supply temperature will rise toward 180°F.
This control continues until shut down.
200
200°F (93°C)
180°F (82°C)
180
160°F (71°C)
160
140°F (60°C)
140
120°F (49°C)
120
100°F (38°C)
100
80
0°F
0
(-18°C)
The maximum outdoor temperature parameter setting enables the boiler to shut down when the
outdoor temperature is higher than 77°F (25°C). This mode can prevent the boiler from operating
under warm conditions unexpectedly.
Maximum outdoor temperature is selected by setting parameter number
"No Maximum" (see section "12.4 Parameter Settings" for more information).
Rinnai I-Series Condensing Boiler Combi Manual
Example
Curve 1
20°F
10 20 30
(-7°C)
Outdoor Temperature
01 and 30 minutes on parameter
180°F
(82°C)
140°F
(60°C)
51°F
(11°C)
40°F
40 50 60 70
(4°C) (27°C)
80°F
80
03
to "77°F (25°C)" or
93