Lochinvar FTxl 500 Service Manual page 25

1
Service
(continued)
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).
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 minutes
to 55 minutes. The default value is 0 minutes.
Figure 1-2 Ramp Delay Interval
Service Manual
Anti-Cycling
Anti-Cycling Time
Once the burner turns off, a set amount of time must elapse
before the control will respond to a new 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 present at the boiler when it shuts 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.
Modulation Factor
This parameter allows the installer to reduce the responsiveness
of the temperature control function, for situations where, for
example, redundant heating capacity is installed. The values
that are available are 40, 50, 60, 70, 80, 90, and 100, with 100
being the most responsive. The default value is 100.
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