Outdoor Reset Function - Intergas HSE-125-N Installation And Service Manual

HSE Installation and Service Manual

2.4.6 OUTDOOR RESET FUNCTION

When the outdoor temperature sensor is connected, the
appliance uses the outdoor reset function to control the
CH supply water
automatically and continuously adjusts the CH supply
temperature based on the outdoor air temperature
following the reset ratio curve. The reset ratio is
determined from entering the following parameters in the
operating panel:
1. CH supply temperature at minimum outdoor temp
(see section 2.4.1, #2.a)
2. minimum CH supply water
(see Table 8, parameter 5)
3. minimum outdoor temperature
(see Table 8, parameter 6)
4. maximum outdoor temperature
(see Table 8, parameter 7)
Figure 31 shows examples of the outdoor reset curves.
Note: Outdoor Reset Function cannot operate unless an
outdoor temperature sensor is connected. If an outdoor
temperature sensor is not connected, the outdoor reset
function parameters will be ignored and the boiler will
operate at the CH supply temperature setting (as per
section 2.4.1, #2.a)
temperature. Outdoor
T supply
°F °C
reset
194 90
176 80
158 70
140 60
122 50
104 40
86 30
68 20
50 10
32 0
-30 -20
X
-22 -4
A curve: factory default setting
B curve: an example of user setting
X axis – Outdoor temperature
Y axis – CH supply temperature
Figure 31 Outdoor reset curve
40
T max.
A
B
T min.
°C
-10 0 10 20 30
°F
14 32 50 68 86
T outside