Laars NeoTherm NTH Installation And Operation Instructions Manual - page 24
LAARS Heating Systems
Page 24
MENU ITEM
FUNCTION
Outlet water temperature
Displays the current outlet water
temperature and allows the
setpoint to be adjusted.
Inlet water temperature
Displays the current inlet water
temperature
Delta T
Displays the current Temperature
rise across the heat exchanger
DHW water temperature
Displays the current DHW
temperature and allows the
setpoint to be adjusted
Stack Temperature
Displays the current stack
temperature
Outdoor Temperature
Displays the current Outdoor
air temperature
Firing Rate
Displays an indicator of the
current
firing rate based upon fan RPM.
The actual firing rate may vary.
LL
Lead/Lag system temperature.
Table 10. User Mode Menu Structure.
information. Menus are accessed by using the buttons
located on the display.
5.2.1 User Mode
USER
USER
USER
USER
USER
mode is the home screen shown on the
control. To navigate from item to item within
USER
USER
USER
USER
USER
mode press the
NEXT
button. If a menu that is user
adjustable is selected, such as outlet or DHW the
UP
or
DOWN
arrows can be used to adjust the temperature
setpoint. Press the
DONE
button to select the adjusted
values.
USER
USER
USER
USER
USER
mode menu structure and information is
shown in
Table 10
.
5.2.1.1
Temperature Control Point
Adjustment
To adjust the temperature control point, confirm
the display is in
USER
USER
USER
USER
USER
mode and the outlet temperature is
being displayed. Press the
UP
or
DOWN
arrow to adjust
the control point temperature. Control point temperature
is measured at the outlet of the heat exchanger. When
making adjustments make sure the control point is set
far enough away from the high limit to keep the
temperature rise of the heat exchanger from causing
nuisance high limit tripping problems.
5.2.1.2
Domestic Hot Water Control Point
Adjustment
To adjust the DHW temperature control point,
confirm the display is in
USER
USER
USER
USER
USER
mode. Scroll through the
menu structure using the
NEXT
button until the current
DHW temperature is being displayed. Use the
UP
or
DOWN
arrow to adjust the setpoint to the desired value.
Press the
DONE
button when complete.
5.2.2 Setup Mode
SETUP
SETUP
SETUP
SETUP
SETUP
mode is accessed by holding the
UP
and
DOWN
arrow keys simultaneously for 3 seconds.
SETUP
SETUP
SETUP
SETUP
SETUP
mode allows the parameters listed in
Table 11
to be
adjusted by using the
NEXT
button to select the
parameter to be adjusted and then the
UP
or
DOWN
arrow keys to make the adjustment. When the
adjustment is complete press the
DONE
(or
NEXT
) button
to move to next menu item.
5.2.2.1
Adjusting the Temperature
Display Units in °F or °C
Confirm the display is in
SETUP
SETUP
SETUP
SETUP
SETUP
mode. Scroll to the
F/C
F/C
F/C
F/C
F/C
menu. Press the
UP
or
DOWN
arrow to adjust
between Fahrenheit and Celsius. Press the
DONE
key
when complete.
5.2.2.2
Adjusting the Outdoor Reset
On or Off
Confirm the display is in
SETUP
SETUP
SETUP
SETUP
SETUP
mode. Scroll to the
LBTHODLOD
LBTHODLOD
LBTHODLOD
LBTHODLOD
LBTHODLOD
menu using the
NEXT
button. Use the
UP
or
DOWN
arrows to select on or off. When outdoor reset is
turned on, three new menus will be added to setup mode.
5.2.2.3
Adjusting Low Boiler
Temperature Setpoint
Confirm the display is in
SETUP
SETUP
SETUP
SETUP
SETUP
mode. Scroll to the
LBT
LBT
LBT
LBT
LBT
menu. Use the
UP
or
DOWN
arrows to scroll to the
minimum water temperature desired during outdoor reset.
5.2.2.4
Adjusting High Outdoor
Temperature Setpoint
Confirm the display is in
SETUP
SETUP
SETUP
SETUP
SETUP
mode. Scroll to the
HOD
HOD
HOD
HOD
HOD
menu. Use the
UP
or
DOWN
arrows to scroll to the
maximum outdoor temperature the reset curve will use
to equate to the minimum water temperature.
MENU ITEM
DEFINITION
RANGE
DEFAULT
F or C
Selects temperature units
F / C
F
LBTHODLOD Outdoor reset
on / off
off
enable/disable - enables
menu items
LBT
Low boiler setpoint
during outdoor reset
40-140F
100F
see Figure 22
HOD
High outdoor temperature
50-90F
70F
setpoint -
see Figure 22
LOD
Low outdoor temperature
-40-70F
32F
setpoint -
see Figure 22
RMT Add
Used for Lead/Lag
1-8
1
(follow menus)
LL
Lead/Lag enable/disable -
oFF/Ldr/SLA oFF
enables menu items
HS
Hysteresis - temp range
2-30F
10F
between on/off cycles
bL
Base Load % - input rate
20-80%
50%
before next boiler fires
Sd
Warm weather shut-down
40-100F
65F
temperature
ASC
Anti short cycle - minutes of
delay between startup
1-15
1
bAC
Future use -
Press DONE to exit menu.
PAS
Future use -
000
Press DONE to exit menu.
NOTE:
When enabling/disabling functions, select "Done" and wait 30
seconds before scrolling.
Table 11. Setup Mode Parameters.