LAARS NeoTherm NTV (Sizes 399-850 MBTU/h) - Service Manual - Manual (Page 85)

75
Service Manual - NeoTherm 500
Setup Menu
To go to the Setup Mode, press and hold the Up and
Down buttons at the same time for about three seconds.
The interface will indicate “°F.”
Press Next to go to the setup for Outdoor Reset (shown
as “LBT HOD LOD”). Use the Up button to turn on the
Outdoor Reset feature, if desired. Once this is enabled,
press Next to go to the lines for Low Boiler Setpoint
(LBT), High Outdoor Temperature (HOD), and Low Out-
door Temperature (LOD). To change any of these, use
the Up and Down buttons. (You do not need to press
Done yet.)
Use the Next button to step through the other items in
this menu. To see the current setpoint for an item, press
the Next button. Then use the Up and Down buttons to
change the setpoint.
Important - When you want to leave the Setup Mode,
press the Done button to save any changes you have
made. If you do not do this, the system will use the old
setpoints.
MENU ITEM DEFINITION
F or C Selects temperature units
LBTHODLOD Outdoor reset enable/disable -
enables following menu items
LBT Low boiler setpoint during outdoor reset
HOD High outdoor temperature setpoint
LOD Low outdoor temperature setpoint
RMT Add Remote address - used for Lead/Lag setup
LL Lead/Lag enable/disable - enables menu items
HS Hysteresis - temp range between on/off cycles
bL Base Load % - input rate before next boiler fires
Sd Warm weather shut-down temperature
ASC Anti short cycle - minutes of delay between
startups
Table D2-2 - Setup Mode Parameters
Using the Original (White) User Interface - continued
Diagnostic Menu
Diagnostic Mode allows you to see any alerts or lock-
outs. This mode is also used to set up the “high fire” and
“low fire” conditions so you can do the gas valve/CO
2
adjustment.
To go to the Diagnostic Mode, press and hold the Next
button for three seconds. The display will indicate a
value, followed by “µA.” This is the signal from the flame
sensor.
Press Next again to see the last alert (since the unit
was last turned on), and press Next again to see the
last lockout. (There is a list of the lockout codes in the
Appendix at the end of this manual.) The table below
shows the other functions in the Diagnostic Mode. Use
the Next button to step through these functions.
For combustion testing, forced high and low fire are ac-
cessed from this menu. See Section C2 for instructions.
MENU ITEM DESCRIPTION
µA Displays the flame sense signal
Alert codes Displays the current alert code
Lockout code Displays the current lockout code
Outlet Limit Displays the outlet temperature limit
DHW limit Displays the Domestic Hot Water limit
setting
Stack Limit
Displays the Stack limit setting
Min. firing rate Displays the minimum firing rate allowed
Min. forced
Allows the user to force the boiler to fire at
firing rate the minimum firing rate
Max forced Allows the user to force the boiler to fire at
firing rate the maximum firing rate
Rate indicator Displays the current firing rate based
on the fan RPM.
Table D2-3 - Diagnostic Mode Menu Structure
D2
cont.