LAARS NeoTherm NTV1000 - Install and Operating Manual - Manual (Page 75)

NeoTherm Boilers and Water Heaters Page 71
When enabled, the Warm Weather Shutdown
feature will turn off the Central Heating
functions when the outdoor temperature
exceeds the setpoint. This prevents the system
from running when there is no need for heat.
Enable -
These options determine how quickly
the system shuts down after the outdoor
temperature rises above the setpoint. The
options are Shutdown immediately/ After
demand ends/ Disabled.
Setpoint -
If the outdoor temperature is higher than this,
the system will shut off the Lead/Lag Central
Heating functions.
13. Press the left-arrow or right-arrow until you see
the Rate Allocation screen (Fig. 92).
fig. 92 – rate allocation
As the load on the system increases, the first
boiler in the Lead/Lag chain will increase the
fan speed until it reaches a certain percentage
of the total output (the “base load”). At that
point, the controller will start the second boiler
in the lead/lag chain. See the explanation at
the beginning of this section and Fig. 51.
Base Load Common -
As the demand increases, this sets the point
at which the controller starts another burner
in the Lead/Lag chain.
To prevent short-cycling, the base load setting
should be set at the values shown in the table
below, or set to higher values.
about the “time of Day” function
If the “time of day” function is enabled, the control
system can be set to maintain different temperatures
for central heat and domestic hot water (other than
the normal setpoints) in the system at certain times of
the day. Normally this function is used to switch to
lower temperatures at night, when the central heating
or domestic hot water demand is reduced. When the
controller acting as the Lead/Lag Master receives a
time of day input, the controller shifts to the special
setpoints entered for central heat and domestic hot
water.
Number
of boilers
Installed
Base load min.
1 65%
2 50%
3 30%
4 30%
table 16 – Base load Settings