Lochinvar 50-210 service manual Service Manual, 1 Outdoor Air Reset Curve, Maximum SH set point

Service Manual

1Service (continued)

Figure 1-1Outdoor Air Reset Curve

Maximum SH set point

When the outdoor temperature drops to or below its minimum setting (F1) the water temperature will be at this point, if the SH set point is set higher (FIG. 1-1). This parameter can be changed by the installer by accessing parameter F3. The temperature range of this parameter is 0°F to 190°F. The default value is 180°F.

Minimum SH set point

When the outdoor temperature rises to or above its maximum setting (F2) the water temperature will be at this point (FIG. 1-1). This parameter can be changed by the installer by accessing parameter F4. The temperature range of this parameter is 0°F to 190°F. The default value is 70°F.

Outdoor air shutdown

When the outdoor temperature rises above this point, the control will block all SH demands (DHW demands will still be active). This parameter can be changed by the user or the installer by accessing parameter F5. The temperature range of this parameter is 0°F to 120°F. The default value is 80°F.

Outdoor air shutdown differential

The outdoor air shutdown differential parameter is the number of degrees below parameter F5 the outdoor air temperature must go before the boiler will respond to a SH demand. This parameter can be changed by the user or the installer by accessing parameter F6. The temperature range of this parameter is 0°F to 90°F. The default value is 10°F.

Shift reset curve

The shift reset curve parameter shifts the actual set point above the calculated set point the number of degrees in this parameter. This parameter can be changed by the installer by accessing parameter F7. The temperature range of this parameter is -27°F to 27°F. The default value is 0°F. This feature will be active if this parameter is set to anything other than 0°F.

19