NTI INSTALLATION MANUALS

Part 9 - Controls

H. Automatic CH Temperature Control (AUTO) The Automatic Temperature Control (AUTO) function allows the boiler to automatically adjust the target temperature of each heating zone to adapt to outdoor and/or indoor temperature conditions and/or heat demand cycles. Select the type of Temperature Control via parameters 4.2.1 (Zone 1), 5.2.1 (Zone 2), or 6.2.1 (Zone 3). The default setting is 3 - Outdoor Reset. See Table 29. NOTE: Automatic Temperature Control is only possible when the AUTO function is turned ON. To activate the AUTO Function, set to “ON” via the User Menu, or set parameter 2.2.4 = 1 via the technical menu. In order for the boiler to detect changes in room temperature it is necessary to install an NTI Room Sensor. Other thermostats (not NTI) can only switch the boiler ON and OFF. NOTICE

194 °F

1.3

1.5

1.0

1.8

2.0

2.5

3.5

3.0

176

0.8

158

0.6

140

0.4

122

0.2

104

86 95

Setpoint of the room temperature °F 73 70 66

Outlet temperature

77

50

32

77 68 59 50 41

32 23 14 5 -4 -13 °F

Parameters of Automatic CH Temperature Control Example: Zone 1 - 400 Level Parameters NOTE: Zones 2 and 3 can be changed in the equivalent 500 and 600 level parameters, respectively

Outdoor temperature

Figure 65 - Reset Slopes

Factory Settings

Parameter

Range

4 Zone 1 4.2 Zone 1 Settings

0 = Fixed Outlet Temperature - Automatic Temperature Control (AUTO) OFF 1 = Basic Temp. Control (without Optional Room Sensor or Outdoor Sensor) 2 = Indoor Temp. Reset (With Optional Room Sensor) 3 = Outdoor Temp. Reset (With Included Outdoor Sensor or weather from the internet if the boiler is connected to WiFi) 4 = Indoor and Outdoor Temp. Reset (With Optional Room Sensor and Included Outdoor Sensor or weather from the internet if the boiler is connected to WiFi)

4.2.1 Type of Temperature Control*

3

The greater the slope, the quicker the boiler target temperature rises as the outdoor temperature decreases. Applicable when 4.2.1 = 3 or 4. Provides a means of adjusting (shifting) the calculated reset boiler target temperature up or down. Applicable when 4.2.1 = 1, 2, 3, or 4. Adjusts the in uence of room temperature on target boiler temperature - a higher setting causes a greater increase to the boiler target temperature as the indoor temperature drops below room setpoint. Applicable when 4.2.1 = 2 or 4.

4.2.2 Slope of Outdoor Reset Curve 0.2 - 3.5

1.3

-12 to +12 (when 4.2.0 = 0) -25 to +25 (when 4.2.1 = 1)

0

4.2.3 Parallel Shift of Reset Curve

4 (when 4.2.0 = 1) 2 (when 4.2.0 = 0)

0 - 20

4.2.4 Room Sensor In uence

Maximum Temperature Setting Minimum Temperature Setting

4.2.5

68-179°F

179

4.2.6

68-179°F

95

4.7 Zone 1 Regulation Parameters

When ON, the boiler automatically adjusts the slope based on the 4.2.2 parameter setting. The slope increases 10% for every 10 minutes a call for heat is active, and decreases 1% every minute after the call for heat has been satis ed.

0 = OFF 1 = ON

4.7.5 Auto Boost

0

Table 29 - Default Parameters for the Heating System Zone 1 - *See the Following Page for Description of 4.2.1

61