•Morning Boost period up to 120 min or Vari-Boost (the length of the Boost time depends on the Outdoor
temperature).
•Adjustable Indoor Temperature Cutoff (Day/Night) Set-Point. Based on the average apartment’s temperature
(Average Indoor Temperature) supplied from the host.
•Adjustable Return Temp or System (Supply) Temperature Cutoff Set-Points.
•Adjustable Zone of no action (D_Band) near the any Cutoff Set-Point.
•Adjustable Cut-Off depth from 0-100%.
•Displays outdoor and hot water heating system supply and return temperature.
•Detects for open and short of the temperature sensors input and displays on the status screen.
•Adaptable to different types of standard temperature sensors and valve motors.
•Provides compensator control for unusual weather conditions.
•Programmable maximum and minimum system (or return) water temperature.
•Internal real-time clock/calendar with backup battery.
•Automatic Daylight Saving Time clock adjustment.
•Automatic circulation pumps ON/OFF control with an adjustable outdoor cut-off.
•Automatic storage of setup values. No loss of setup values or mode of operation if power is OFF for extended time.
•Initial valve synchronization on power up.
•Automatic valve synchronization while in operation to eliminate possible deviation of the actual and calculated
valve positions.
•Simple calibrations procedures.
•Locally controlled by the four-button keypad and convenient menu.
•Password protection for the critical parameters settings.
•Remotely controlled and/or monitored through the RS485 interface.
2. Control
The four-button keypad and 16 characters by 2 lines LCD backlit display are located on the front panel of the
HWHC2100. These controls provide full local management of the system. Operator can read system setting and parameters
(e.g. temperatures, valve position and alerts), set the operational modes, or change settings.
The control keypad consists of four pushbuttons: Escape (Esc), Down (), Up (), Enter (Enter). The keys are
also marked with letters A, B, C, D used to simplify the passwords memorizing.
During normal operation the upper line of the display shows a current operation mode: OFF, AUTO, MANUAL OPEN
(M_OPEN), MANUAL CLOSE (M_CLOSE), MANUAL SET (M_SET), target temperature (on AUTO or M_SET mode of
operation), and system’s status information (please see page ). When calibration modes selected, the upper line displays the
information regarding particular mode.
The line at the bottom of the display is dedicated to various status information and menu-driven setup dialogs. To
browse to more options press the Enter key at the “Enter for more …” status information line.
3. Operation
The HWHC2100 checks the Outdoor temperature (OD) by means of an Outdoor Sensor, at the same time it
monitors the hot water system temperature (ST) or hot water return temperature (RtnT) of the building’s heating system by
means of the ST or RtnT Sensor. Controlled temperature (ST or RtnT) is main parameter of regulation. It could be selected
from the menu by properly setting of the controller’s configuration for a particular application.
In the AUTO mode when Outdoor temperature falls below an adjustable Outdoor cutoff temperature, the controller activates
the system pump and provides automatic positioning of the control valve in accordance with the configuration, measured
temperatures, season, time of day, and selected parameters. If the ST(or RtnT) is different from the controller calculated
Target Temperature, the HWHC2100 will correct the difference by moving the valve toward the close or open position.
Also the controller can monitor return water temperature or system water temperature. This feature is activated from the
controller’s configuration and by setting water (System or Return) Temperature Cut Off Set Point (please refer to the
controller’s Menu on fig.2 or description on page 10). If ST(or RtnT) above the Cut Off Set Point the Valve shell be close.
In the MANUAL SET mode the controller automatically keeps the System Hot Water Temperature or the Return Water
