LAARS NeoTherm NTV (Sizes 150–850 MBTU/h) - Install and Operating Manual - Manual (Page 44)

Page 40 LAARS Heating Systems
then go to “CH Configuration.” Select “Outdoor Reset
Configuration.” Set the value on the line for “Min. Boiler
Water Temp.”
If your system has more than one boiler, and is controlled
using the Lead/ Lag function –
How to get there: From the “Home” screen, press “I” to
go to “Info/ Install.” Choose “Advanced Setup,” then go
to “Lead/ Lag Configuration.” Select “Lead/ Lag Outdoor
Reset.” Set the value on the line for “Min. Water Temp.”
8C.6 Warm Weather Shutdown
About Warm Weather Shutdown -
The Warm Weather Shutdown feature tells the unit to stop
firing if the outdoor temperature rises above a temperature
you set. Notice that this affects the central heat or hydronic
function only. If a call for domestic hot water arrives, the unit
will still fire and respond to that. Warm Weather Shutdown
requires the connection of an outdoor temperature sensor. See
Section 8C.4. (If Outdoor Reset is active, the same sensor can
be used for both functions.)
Here are instructions for setting up the Warm Weather
Shutdown function. Notice that these instructions will be
different, depending on whether your system has a single
boiler or more than one boiler (using Lead/Lag operation).
Wiring Connections -
Connect the outdoor temperature sensor.:
If your system has just one boiler –
Connect the sensor across terminals 1 and 2 on TB-7.
If your system has more than one boiler, and is controlled
using the Lead/ Lag function –
Connect the sensor across terminals 1 and 2 on TB-7 on the
boiler which will be used as the Lead/Lag Master.
Setting Up the Control Functions -
1.
Enable the Warm Weather Shutdown function:
If your system has just one boiler –
How to get there: From the “Home” screen, press “I”
to go to “Info/ Install.” Choose “Advanced Setup,”
then go to “CH Configuration.” Select “Warm Weather
Shutdown.” On the line for “Warm Weather Shutdown,”
select “Immediately.”
If your system has more than one boiler, and is controlled
using the Lead/ Lag function –
How to get there: On the unit used as the Lead/ Lag
Master only - From the “Home” screen, press “I” to go
to “Info/ Install.” Choose “Advanced Setup,” then go to
“CH Configuration.” Select “Warm Weather Shutdown.”
On the line for “Warm Weather Shutdown,” select
“Immediately.”
2. Enter the setpoint for this feature:
If your system has just one boiler –
How to get there: From the “Home” screen, press “I”
to go to “Info/ Install.” Choose “Advanced Setup,”
then go to “CH Configuration.” Select “Warm Weather
Shutdown.” Go to the line for “Warm Weather Shutdown
Setpoint”, and set the value.
If your system has more than one boiler, and is controlled
using the Lead/ Lag function –
How to get there: On the unit used as the Lead/ Lag
Master only - From the “Home” screen, press “I” to go
to “Info/ Install.” Choose “Advanced Setup,” then go to
“CH Configuration.” Select “Warm Weather Shutdown.”
On the line for “Warm Weather Shutdown Setpoint,” and
set the value.
8C.7 Domestic Hot Water
A NeoTherm unit can be configured to supply domestic hot
water (DHW) as a stand-alone “volume” unit (DHW models)
or as a secondary function while the unit also provides
hydronic heating. The piping used to supply domestic hot
water (DHW) can be set up in several different ways. See
Section 6 for details. In this section, we will describe the
wiring and control setup for several different types of DHW
supplies.
DANGER
• Water temperature over 125°F (52°C) can cause
severe burns instantly or death from scalds.
• Children, disabled and elderly are at hightest risk of
being scalded.
• Set the water temperature carefully as described
below.
• Feel the water before
bathing or showering.
• If this appliance is used to
produce water that could
scald if too hot, such
as domestic hot water
use, adjust the outlet
control (limit) or use temperature limiting valves to
obtain a maximum water temperature of 125°F (52°C).