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Part number 550-100-260/0520
90
ECO
®
Tec
GAS-FIRED WATER BOILER – 80/110/150/199 BOILER MANUAL
Priority Setting screens (continued)
ECO
Tec PRIORITY options
Failure to set correctly could
result in severe personal injury, death or substantial
property damage.
1. Access contractor menus by pressing and holding the WM
Logo for 7 seconds from the home screen.
2. See the following pages for explanations of control setting
options.
Voltage for Min
Target
Only appears if Target Adjust or Source for Input 2 is set
to 0-10V. For Target Adjust, this sets the voltage at which
Min Target Temp temperature is requested. For Source on
Input 2, this sets the voltage that corresponds to Min Rate.
Cold Start Error
At ignition, the difference between the Target temperature and
the current temperature is compared to this value to decide
the starting modulation rate once released to modulation. If
the difference is less than or equal to this value the modula-
tion rate will start at Min Rate. If it is greater than this value,
the control will calculate a higher modulation starting rate.
Hot Water Temp
Set target temperature to the required Combi water
temperature for the application according to design with
mixing valve.
Combi
Enabled
Select whether to enable or disable Combi functionality.
Disabling Combi functions will ignore DHW flow calls for heat
and only allow Central Heat on inputs 2 & 3 to service calls for heat.
DHW On Diff
The DHW Outlet temperature must fall below the Hot
Water Temp minus this value in order to proceed to ignition.
DHW Off Diff
If the DHW Outlet temperature exceeds the Hot Water Temp
plus this value, the burner will shut off.
PREHEAT Mode
Select the mode of PREHEAT, between Off, Economy and
High Performance.
PREHEAT Temp
Select the target temperature of the PREHEAT functionality.
The boiler will drive to this temperature until PREHEAT Off
Diff is achieved, or is interrupted by a call for heat.
PreHeat will end if Boiler Out and Boiler In exceed this
temperature.
PREHEAT Circ Diff
When in Standby, if the Boiler Out temperature falls below
the PREHEAT Temp minus the PREHEAT Circ Diff, the
boiler will activate the boiler circulator.
PREHEAT On Diff
Temperature differential that is checked when Preheat starts due
to temp falling below Circ Diff. Checks water temp to determine
whether to stop Preheat or continue to turning on burner.
PREHEAT Off Diff
While modulating on PREHEAT mode, if the Boiler Out
temperature exceeds the PREHEAT Temp plus this value,
the burner will shut off and PREHEAT mode will exit.
ECO BOOST
Select whether or not to use the ECO BOOST feature. If con-
ditions are met, the burner will continue to fire after Combi
flow ends to recover temperature within the heat exchanger.
ECO Boost will end if Boiler Out and Boiler In exceed this
temperature.
ECO BOOST
Setpoint
This setpoint is the temperature that will be driven to by
the ECO BOOST.
ECO BOOST On
Diff
If a Combi DHW call for heat ends, the Boiler Out tem-
perature is compared to the ECO BOOST Setpoint minus
ECO BOOST On Diff. If below this value, the burner will
continue to fire.
ECO BOOST Off
Diff
If firing due to ECO BOOST and the Boiler Out temperature
exceeds the ECO BOOST Setpoint plus this value, the burner
will shut off and ECO BOOST will end.
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