Install Instructions

8
OPTIONAL FEATURES
HOW THERMAL TARGETING WORKS
SYSTEM START-UP
Thermal Targeting technology analyzes thermostat activity and continually evaluates how much heat the house requires. When it
is very cold outside, the heat demand is high and the Fuel Smart HydroStat will raise the boiler’s Target temperature to provide
needed heat to the home. When the outside temperature is milder, the heat demand is lower. During these periods, the Fuel
Smart HydroStat will lower the boiler’s Target temperature – saving fuel – while continuing to provide comfort to the house.
At initial start up, with the Economy Feature active, the control establishes a 145°F target temperature. To test the high limit
shut-off function, the Economy Dial must be turned to OFF. Once tested, restore the Economy setting. If the heating demand is
high, the target will increase over time to satisfy the heat load.
NOTE:
• Smart DHW Priority: During a call from an indirect water heater, the control will de-energize the circulator contacts (C1/C2) to
heat only the indirect tank ensuring an adequate supply of domestic hot water. The control will re-energize the circulator when
the indirect tank is satisfied or if the boiler temperature reaches 170°F. If the indirect call continues for 45 minutes, the control
will override the priority function energizing the circulator to provide space heating.
NOTE: The Program Mode – Pro – is accessed by turning the
LO TEMP dial to a position just above OFF.
Thermal Pre-Purge
Thermal Pre-Purge is designed to maximize boiler efficiency. When activated, the control will supply latent heat that may remain
in the boiler from a previous run cycle to the heating zone that is now calling. The control monitors how quickly the boiler tem-
perature is declining and activates the burner only when it determines that the latent heat is insufficient to satisfy the call.
During the purge cycle, the display will indicate
Pur. This feature works with single-zone and multi-zone heating systems utiliz-
ing circulators or zone valves. No change in wiring is needed.
To activate Thermal Pre-Purge
1. Turn the LO TEMP dial to access the Program Mode – indicated in the display as Pro
2. Turn the HI TEMP dial to select feature 1
3. Push the Test/Settings Button to turn Thermal Pre-Purge on or OFF
4. Reset LO TEMP and HI TEMP settings to desired temperatures (see page 7)
Degrees Fahrenheit or Celsius
The control has the ability to operate in degrees Fahrenheit or Celsius. When operating in Celsius, a c will appear in the display
next to the temperature whenever the temperature is below 100 degrees.
To change between degrees Fahrenheit and degrees Celsius
1. Turn the LO TEMP dial to access the Program Mode – indicated in the display as
Pro
2. Turn the HI TEMP dial to select feature 2
3. Push the Test/Settings Button to c for Celsius or F for Fahrenheit
4. Reset LO TEMP and HI TEMP settings to desired temperatures (see page 7)
Manual Reset Low Water Cut-Off
The low water cut-off operation on the HydroStat can be set to operate in automatic (default) or manual reset mode. When in manual reset
mode, the control will shut-down the burner immediately when a low water condition is detected. If the low water condition is sustained for 30
seconds, the low water light will blink, indicating that the control has locked out the burner. The control can only be reset by pushing the Test
Settings button on the top of the control. The manual reset feature meets CSD-1 code requirements.
IMPORTANT: The system must be checked by a qualified heating professional prior to resuming operation.
WARNING: DO NOT ADD WATER UNTIL THE BOILER HAS FULLY COOLED.