Lochinvar Copper-fin II/IIE 402 - 2072 - Manual (Page 20)

1
Service
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Maximum SH setpoint
When the outdoor temperature drops to its minimum
setting (F1) the water temperature setpoint will be at this
value, if the SH setpoint is set higher (FIG. 1-1). The
temperature range of this parameter is 32°F (0°C) to 248°F
(120°C). The default value is 180°F (82°C).
Minimum SH setpoint
When the outdoor temperature rises to or above its
maximum setting (F2) the water temperature will be at this
value (FIG. 1-1). The temperature range of this parameter
is 32°F (0°C) to 248°F (120°C). The default value is 70°F
(21°C).
Outdoor air shutdown
When the outdoor temperature rises above this point, the
control will block all SH demands (DHW demands will
still be active). The temperature range of this parameter
is 32°F (0°C) to 122°F (50°C). The default value is 80°F
(27°C).
Figure 1-1_Outdoor Air Reset Curve
Outdoor air reset (boiler only)
Outdoor air reset operation
When the outdoor air sensor is installed, the control will
calculate the water temperature setpoint based on the outdoor
air temperature. As the outdoor air temperature drops, the
water temperature setpoint increases. This feature allows
the unit to be more efficient in periods of mild weather, see
FIG. 1-1.
Minimum air temperature
When the outdoor air temperature drops to this point, the
water temperature will be at its maximum setting (FIG.
1-1). The setpoint will continue to increase as the outdoor
temperature drops below this setting. The water temperature
will be limited by the user setpoint. The temperature range of
this parameter is -22°F (-30°C) to 86°F (30°C). The default
value is 25°F (-4°C).
Maximum air temperature
When the outdoor air temperature rises to or above this point,
the water temperature will be at its minimum setting (FIG.
1-1). The temperature range of this parameter is -22°F (-30°C)
to 86°F (30°C). The default value is 70°F (21°C).
Copper-fin II/IIE Boiler and Water Heater Service Manual