6
III - MODULATING CONTROL FEATURES
BOILER CONTROL DESIGN
The integrated modulating boiler control is designed for cen
-
tral heating (CH) hot water boilers with modulating fan and
gas-air control. Options for domestic hot water (DHW) and
outdoor reset are available. Modulation is based upon data
relayed to the control by specific temperature sensors. To ig
-
nite the burner, a direct spark igniter (DSI) is used.
The modulating boiler control is intended for use in combina
-
tion with a display/user interface unit for both information and
operation purposes. the control is designed for installation
with a conventional on/off dry contact room thermostat. The
control is able to provide hot water and outdoor reset func
-
tions.
MAIN CONTROLLER FUNCTIONS
Central Heat (CH):
the control uses sensors on the supply
water, return water and outside air to determine the heat load
of the heating system. This results in the boiler supplying just
enough heat to satisfy the demand which results in fewer
II - OPERATING INFORMATION
DHW OPERATION (IF USED)
The boiler control allows connection of a DHW aquastat to
low voltage terminal strip terminals DHW T1 and DHW T2.
When the DHW aquastat calls for heat, the module shuts
down the boiler circulator activated the DHW circulator and
overshoots and less short cycling than a conventional on/off
boiler.
Domestic Hot Water (DHW):
When used in conjunction
with an indirect hot water heater this boiler has the capability
to provide domestic hot water. An on/off dry contact aquastat
is used to activate the call for domestic hot water.
Outdoor Reset:
This control has the ability to sense outside
air temperature using a factory supplied, field installed sen
-
sor. the controller detects the presence of the sensor and
acts according to the parameters programmed into the con
-
troller.
DISPLAY/USER INTERFACE
By means of the display/user interface, the installer and home
owner can scroll through the control settings and customize
the boiler to the heat delivery system used in the location
of installation. See the “User Interface Quick Reference” in
Section X of this manual for more information on using and
programming the boiler control.
immediately sets target outlet water temperature to 180°F.
This provides automatic priority heat allocation to the indi
-
rect water heater for maximum response and recovery. The
DHW circulator continues for 30.6 seconds after the heating
cycle to deliver the most possible heat.
IV - BOILER STARTUP
STARTUP
NOTE: Instructions in this manual are based on factory
default parameter settings.
Start the boiler only after completing all instructions
1.
in the installation manual.
To start the boiler, follow the
2.
“Operating Instructions”
in this manual.
Once the boiler has started and is operating,
3.
continue the startup procedure by performing all of
the following steps to set and verify operation of the
controls.
SET SPACE HEATING OPERATION
VERIFY SPACE HEATING MODE
1.
Press the “Mode” button until the display shows
a.
[PARA]
. This is the parameter mode.
Press the “Step” button until the first digit of the dis
-
B.
play shows “3.”
The last digit must show a “1.” If any other number
C.
displays, press the “+” button until a “1” shows in the
right-hand digit, then press the “Store” button to save
this setting.
SET SPACE HEATING TARGET TEMPERATURE
2.
Press the “Step” button until the first digit of the dis
-
a.
play shows “4.” The last three digits will show the out
-
let water temperature setting.
Press the “+” or “-” buttons to change the setting to
B.
the desired outlet water temperature. The factory de
-
fault setting is 180°F.
OUTDOOR SENSOR INSTALLED:
•
setting is the
target temperature for outdoor temperature at or
below the factory setting (32°F). At higher outside
temperatures, the control module calculates the
target temperature.
