Lochinvar 400 - 801 service manual Outdoor Reset

1Service

F: Outdoor Reset

The option of controlling up to three (3) different outdoor resets for low outdoor temperatures is available.

Low Outdoor Temperature

When the outdoor air temperature drops below this point, the water temperature will be at parameters F3, F8 and F13 (FIG. 1-1). However, if the user set point is set lower, the water temperature will be limited by the user set point instead. This parameter can be changed by the installer by accessing parameter F1. The temperature range of this

parameter is	-40°F (-40°C) to 104°F (40°C). The default
value is 25°F	(-4°C).

High Outdoor Temperature

When the outdoor air temperature rises to or above this point, the water temperature will be at parameters F4, F9 and F14 (FIG. 1-1). This parameter can be changed by the installer by accessing parameter F2. The temperature range of this parameter is -40°F (-40°C) to 104°F (40°C). The default value is 70°F (21°C).

Service Manual

SH1 - SH3 Set Point at Low Outdoor Temperature

When the outdoor air temperature drops below this point, the water temperature will be at this setting (FIG. 1-1). However, if the user set point is set lower, the water temperature will be limited by the user set point instead. These parameters can be changed by the installer by accessing parameters F3, F8 and F13. The temperature range of this parameter is -40°F (-40°C) to 104°F (40°C). The default value is 25°C (-4°C).

SH1 - SH3 Set Point at High Outdoor Temperature

When the outdoor air temperature rises to or above this point, the water temperature will be at this setting (FIG. 1-1). These parameters can be changed by the installer by accessing F4, F9 and F14. The temperature range of this parameter is -40°F (- 40°C) to 104°F (40°C). The default value is 70°F (21°C).

Outdoor Air Shutdown (SH1 - SH3)

When the outdoor temperature rises above this point, the control will block all SH demands (DHW demands will still be active). These parameters can be changed by the installer by accessing parameters F5, F10 and F15. The temperature range of this parameter is 32°F (0°C) to 104°F (40°C). The default value is 70°F (21°C).

Figure 1-1Outdoor Air Reset Curve

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