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MODU-FIRE® FORCED DRAFT
Gas-Fired Boiler Installation
Mode 3 – dedicated DHW operation using par-
allel piping. A call for heat is determined by the
DHW sensor. The boiler outlet water is con-
trolled to the boiler target temperature.
Mode 4 – outdoor reset and reset override op-
eration using parallel piping. The boiler is oper-
ated as in Mode 1. However the target tempera-
ture is based on outdoor reset. The outdoor re-
set temperature can be remotely overridden.
Mode 5 – outdoor reset and reset override op-
eration using primary/secondary piping. The
boiler is operated as in Mode 2. However, the
target temperature is based on outdoor reset.
The outdoor reset temperature can be remotely
overridden.
Mode 6 – This mode is used for remote control
mode. The Boil Max setting is the boiler shut-
down temperature.
Operation:
The Boiler Temperature Control uses a Liquid Crys-
tal Display (LCD) as a method of supplying infor-
mation. The LCD is used to setup and monitor sys-
tem operation by means of three push buttons
(Scroll, ▲,▼). Scroll advances the display, while
▲,▼are used in the adjust menu.
All items displayed by the control are organized into
two menus, the
view menu and the adjust menu.
The active menu is displayed in the upper right hand
side of the display in the menu field. The default
menu is the view menu.
When the temperature control is powered up, the
control turns on all segments in the display for 2
seconds, then the software version is displayed for 2
seconds. At the end of that 4 second period, the
control enters the normal operating mode and
“VIEW” is displayed. Pressing the scroll button
“scrolls” through the displayed values in the
“VIEW” menu.
To make an adjustment to a setting in the control,
begin by selecting the “ADJUST” menu. To change
from the view menu to the adjust menu, simultane-
ously press and hold all three buttons for 1 second.
The menu name, “ADJUST” will be displayed in
the menu field. The menu will automatically revert
back to the view menu after 20 seconds of keyboard
inactivity.
To make adjustments, scroll to the desired item us-
ing the scroll button. Finally, use the ▲or ▼ button
to make the adjustment.
In the absence of other information, the following
should be used as default item settings:
ITEM DEFAULT
MODE 1
BOIL TARGET 180ºF
BOIL MAX 210ºF
BOIL MIN 140ºF
FIRE DELAY 1:30
BOIL MASS 1
DIFF 20ºF
MOTOR SPEED 20
START
MODULATION 0
MIN
MODULATION 0
PUMP DLY 5:00
UNITS ºF
20