Laars NTH1000, Installation And Operation Instructions Manual, Page: 83 / 140

NeoTherm LC Boilers and Water Heaters Page 79
4. Select that line by pressing it. If you want
to change the DHW priority, the system will
ask you to log in using the installer-level
password. For this kind of installation, the
entry should be “DHW> CH.”
5. Go to the line for “DHW Priority vs Lead
Lag.” For this kind of installation, the entry
should be “DHW> LL.”
6. Remember to change the settings on the other
controller/burner for this boiler.
Setup Type 3 –
The third possibility is to set up a single boiler that just
provides domestic hot water. The model NTV unit is
designed for this kind of “volume water” service. The
water is heated as it moves through the boiler, and that
same water is supplied directly for domestic use. This
is really like a conventional Lead/Lag setup, except
priority is given to domestic hot water, and there is no
input for the central heating function.
• On each boiler which will operate this way,
connect a DHW sensor or the input from the
aquastat to terminals 5 and 6 on TB6. Be
sure there is no thermostat connected (check
terminals 5 and 6 on TB7).
• The two burners in each boiler will operate
in the Lead/Lag mode. You can think of each
boiler as a separate two-burner Lead/Lag
system.
• The setpoint used is the LL DHW setpoint, set
as part of the Lead/Lag system.
• In the Lead/Lag setup, DHW is given priority.
1. Start at the ‘home’ screen (Fig. 116).
Fig. 116 – ‘home’ screen
2. Press the Lead Lag Master button. Fig. 117
shows the screen that follows.
Fig. 117 – Lead/Lag Master Screen
3. Press the Configure button. The display will
present the Lead/Lag Master Configuration
Screen (Fig. 118). Set the DHW setpoint on
this screen.
Fig. 118 – Lead/Lag Master Configuration
4. 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. 119).
Fig. 119 – Domestic Hot Water
Set the last line to give priority to the DHW
function.