Lochinvar 400 - 801 service manual Temperature Settings, Data Logging, Functions

1Service

Display Timeout

This is the time in which the display remains illuminated. The range is 10 seconds to 10 minutes. The default is 3 minutes.

B: Temperature Settings

Space Heating (SH1, SH2, SH3) Set Point

CAUTION	Mixing valves are required for the
	protection of any low temperature loops.

There are three (3) individual user set points for better zone control. These are listed as SH1 Set Point through SH3 Set Point. If multiple set points are calling for heat the highest set point has priority. The range is 32°F (0°C) to 190°F (88°C). The default is 125°F (52°C).

Space Heating (SH) Minimum Set Point

The SH minimum set point sets the minimum water temperature set point that can be used for space heating operation. The user or installer will not be able to program the control with a lower SH set point. This parameter can only be changed by the installer by accessing parameter B2. The temperature range of this parameter is 32°F (0°C) to 190°F (88°C). The default value is 70°F (21°C).

Space Heating (SH) Maximum Set Point

The SH maximum set point sets the maximum water temperature set point that can be used for space heating. The user or installer will not be able to program the control with a higher SH set point. This parameter can only be changed by the installer by accessing parameter B3. The temperature range of this parameter is 32°F (0°C) to 190°F (88°C). The default value is 185°F (85°C).

SH1 - SH3 Offset Set Point

The SH offset sets how many degrees above set point the temperature has to go before the boiler will shut off. This parameter can only be changed by the installer by accessing parameters B4, B7 and B10. The temperature range of these parameters is 0°F to 20°F. The default value is 10°F.

SH1 - SH3 Differential Set Point

The SH differential sets how many degrees below the offset the temperature has to drop before the boiler turns back on. This parameter can only be changed by the installer by accessing parameters B5, B8 and B11. The range is 0°F to 60°F. The default is 20°F.

3-Way Valve Time

Not used.

20

Service Manual

C: Data Logging

Reset last 10 errors

The reset last 10 errors function clears the last 10 errors log.

D: Functions

Service Mode Delay

By pressing the pin button on the front of the display for five

(5)seconds, the control will be placed in Service Mode. This will override all other heat demands. The Service Mode allows the installer to set the unit to either maximum firing rate or minimum firing rate for the purpose of combustion analysis. The delay sets the length of time the boiler will stay in the Service Mode if no keys have been pressed before going back to its original state. This parameter can only be changed by the installer by accessing parameter D1. The time range of this parameter is 0 to 30 minutes. The default value is 20 minutes.

Freeze Protection Pump On

The SMART SYSTEM control will turn on the boiler and system pump outputs whenever the inlet temperature drops below this setting. This is done to prevent the water in the heat exchanger from freezing. Certain low-temperature applications (such as snow melt) can operate at temperatures around freezing, so this setting needs to be lowered in these cases. The installer can adjust the temperature at which the pump outputs are turned on by accessing parameter D2. The minimum setting is -4°F (-20°C), and the maximum setting is 45°F (7.2°C). The default setting is 45°F (7.2°C).

Freeze Protection Burner On

If running the pumps does not prevent the inlet temperature from falling closer to freezing, the SMART SYSTEM control will fire the burner at low fire. The installer can adjust the temperature at which the burner fires by adjusting parameter D3. The minimum setting is -4°F (-20°C), and the maximum setting is 45°F (7.2°C). The default setting is 37°F (2.8°C).

Freeze Protection Burner Differential

Once the burner has started firing due to a low inlet temperature, the inlet temperature must increase by this amount before the burner turns back off. The installer can adjust this differential by accessing parameter D4. The minimum setting is 0°F, and the maximum is 20°F. The default setting is 5°F (2.8°C).