Lochinvar KNIGHT 51-211 - Manual (Page 22)

1
Service
Service Manual
22
1
Service
(continued)
Figure 1-1 Outdoor Air Reset Curve
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).
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).