LAARS Heating Systems
Page 82
fig. 113 – lead/lag master Screen
4. Press the Configure button. The display will
present the Lead/Lag Master Configuration
Screen (Fig. 114).
Fig. 114 – Lead/Lag Master Configuration
Entries on this screen allow you to set the CH
setpoint and DHW setpoint.
5. Press the button for Advanced Settings. This
leads to a “ring” of related screens, and you
can scroll through the list by pressing one of
the left- or right-arrow symbols. Press the
left-arrow or right-arrow until you see the
Domestic Hot Water screen (Fig. 115).
fig. 115 – Domestic Hot Water
An entry on this screen allows you to give
priority to the DHW function.
Setup type 2 –
As a second option, a system can be set up so that
only one or two boilers respond to a demand for
domestic hot water. This allows the other boilers
in the system to continue to service the demand for
central heating. This system is more flexible, but the
setup is a bit more complicated:
• All of the boilers are tied together in the
normal way, using the Modbus connections.
• The DHW demand must switch over a whole
boiler (including both burners), not just a
single burner. Both burners in a boiler should
always use the same setpoint.
• The plumbing must be set up so that, during
DHW demand, each boiler used for DHW
is pumped by the DHW pump, and the
boiler pump is turned off. This will keep the
temperature zones separate.
• Each of the boilers that will handle DHW is
wired with an input from the aquastat used to
indicate DHW demand. The aquastat demand
should be jumpered from the Primary control
in each boiler (terminals 5 and 6 on TB6 to
terminals 7 and 8 on TB6).
• The LL CH setpoint used by all of the boilers
is set in the normal way, working from the
Lead/Lag section of the software.
• On each of the boilers used for DHW, priority
is given to the DHW function. Because this
affects individual boilers, rather than the
whole system, this part of the setup is done
from outside the Lead/Lag system.
Summary of Contents for NTV1000
Page 2: ......
Page 35: ...NeoTherm Boilers and Water Heaters Page 31 Fig 20 Ladder Diagram...
Page 36: ...LAARS Heating Systems Page 32 Fig 21 Wiring Diagram...
Page 37: ...NeoTherm Boilers and Water Heaters Page 33...
Page 51: ...NeoTherm Boilers and Water Heaters Page 47 Fig 52 Connection Terminals...
Page 130: ...LAARS Heating Systems Page 126 Fig 140 Machine Frame and Rear Panel 13 3 PARTS ILLUSTRATIONS...
Page 131: ...NeoTherm Boilers and Water Heaters Page 127 Fig 141 Front Panel and Covers...
Page 132: ...LAARS Heating Systems Page 128 Fig 142 Burners and Combustion Chambers...
Page 134: ...LAARS Heating Systems Page 130 Fig 145 Electronic Components...
Page 135: ...NeoTherm Boilers and Water Heaters Page 131 Fig 146 Condensate Trap Fig 147 Control Bezel...
Page 136: ...LAARS Heating Systems Page 132 Fig 148 Flow Switch...
Page 137: ...NeoTherm Boilers and Water Heaters Page 133 This page intentionally left blank...