LAARS NeoTherm NTV (Sizes 150–285 MBTU/h) - Service Manual - Manual (Page 76)

66 Service Manual NeoTherm 80 - NeoTherm 285
Using the Original (White) User Interface
This interface was used on all NeoTherm models produced through
2012.
There are a few features on this interface that you should know about -
• When the NeoTherm unit is first turned on, the interface will go through a
self-test routine for 90 seconds. During this time, none of the buttons will
work. Just wait for the self-test to be completed before you try to use the
interface.
Figure D2-1 - Typical display on original (white)
user interface
MENU ITEM FUNCTION RANGE DEFAULT
Outlet Displays the current outlet 55-190°F 120°F
water temperature and allows
the setpoint to be adjusted
Inlet Displays the current inlet — —
water temperature
Delta T Displays the current — —
temperature rise across
the heat exchanger
DHW water Displays the current DHW 60-182°F 120°F
temperature temperature and allows the
setpoint to be adjusted
Stack Displays the current stack — —
temperature temperature
Outdoor
Displays the current outdoor — —
temperature air temperature
Firing Rate Displays the current firing
— —
rate based on fan RPM.
LL Displays the current system 60-190°F 120°F
temperature for Lead/Lag operation
and allows the setpoint to be adjusted
Table D2-1 - User Mode Menu Structure
• The interface records the last lockout and alert
codes, but these are erased if the interface is reset
or power to the NeoTherm unit is turned off. (We will
explain how to handle lockouts on this interface in
Section D3.)
• Whenever you change a setpoint or value, you must
press the Done button. If you do not do this, the in-
terface will continue to use the old setpoint or value.
The display navigation is divided into three operating
modes: User, Setup, and Diagnostic.
User Mode
Normally the unit will display the User mode screen shown
to the right. Notice the entry for Outlet in the upper left-hand
corner. This means the interface is displaying the current
outlet temperature.
To check the setpoint for Central Heat, press the Up but-
ton. Use the Up or Down buttons to change the setpoint.
Important - You must press the Done button to save the
new setpoint, or the interface will use the old setpoint.
To go to the next item in this menu, press the Next but-
ton. The interface will show the inlet water temperature.
Use the Next button to step through the other items in
this menu. See the table to the right.
If you want to change the DHW (domestic hot water) set-
point, use the same procedure we have just described -
use the Up and Down buttons to set the new value, then
press Done.
Up
button
Down
button
Reset button Done button
D2