Lochinvar 400-801 - Manual (Page 22)

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Service
Service Manual
Boost Time
The boost time parameter sets the amount of time that must
elapse with a SH demand before the water temperature calculated
set point will be increased. This parameter can be changed by
the installer by accessing the Boost Time parameter. The time
range for this parameter is 0 minute to 50 minutes. The default
value is 0 minutes.
Anti-Cycling
Anti-Cycling Time
Once a SH demand has been satisfied, a set amount of time must
elapse before the control will respond to a new SH demand. The
control will block the new heat demand and anti-cycling will
be shown in the display until the time has elapsed or the water
temperature drops below the Anti-Cycling Override Differential
parameter. This parameter can be changed by the installer by
accessing the Anti-Cycling Time parameter. The time range for
this parameter is 1 minute to 10 minutes. The default value is
1 minute.
Anti-Cycling Override Differential
The control will bypass the anti-cycling time if the inlet
water temperature drops too much. The control will use the
inlet water temperature the boiler was at when it shut off as
the starting point. If the inlet temperature drops below the
temperature parameter the control will abort anti-cycling and
allow the boiler to fire. This parameter can be changed by
the installer by accessing the Anti-Cycling Override Differential
parameter. The temperature range of this parameter is 0°F (0°C)
to 54°F (30°C). The default value is 10°F (6°C).
Ramp Delay (Enable / Disable)
This parameter allows the installer to enable or disable the SH
ramp delay. The default setting is disabled.
Outdoor Air Shutdown Differential (SH1 - SH3)
The outdoor air shutdown differential parameter is the
number of degrees below Outdoor Air Shutdown SH1, SH2,
and SH3 parameters the outdoor air temperature must go
before the boiler will respond to a SH demand. These
parameters can be changed by the installer by accessing
the Outdoor Air Shutdown Differential SH1, SH2, and SH3
parameters The temperature range of this parameter is 0°F
(0°C) to 54°F (30°C). The default value is 10°F (6°C).
Shift Reset Curve (SH1 - SH3)
There is a shift reset curve for each outdoor reset. The shift
reset curve parameter shifts the actual set point above or
below the calculated set point by the number of degrees in
this parameter. These parameters can be changed by the
installer by accessing the Shift Reset Curve SH1, SH2, and
SH3 parameters. The temperature range of this parameter
is -17°F (-10°C) to 18°F (10°C). The default value is 0°F
(0°C). This feature will be active if this parameter is set to
anything other than 0°F (0°C).
Boost Temperature
If a SH demand lasts longer than the programmed time
delay setting and there have been no DHW demands, the
control will increase the water temperature set point by the
amount in this parameter. If the SH demand continues
through another time period, the set point will be increased
again. This will continue until either the SH demand ends,
a maximum of 20 increases has occurred, or SH1, SH2,
SH3 maximum set point has been reached. Once the SH
demand has been satisfied the set point will revert back
to its calculated setting. The boost temperature can be
changed by the installer by accessing the Boost Temperature
parameter. The temperature range of this parameter is 0°F
(0°C) to 25°F (14°C). The default value is 0°F (0°C). This
feature will be active if this parameter is set to anything
other than 0°F (0°C).
Figure 1-2 Ramp Delay Interval
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