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The following items can be viewed or interacted with on the Home Screen: On/Off button -Pressing this button allows the boiler to be placed in either Manual Shutdown Mode or Standby Mode. Status - This line shows the current operating status of the Crest boiler and the current set point. Outlet Water Temperature - This is the boiler outlet temperature. Inlet Water Temperature - This is the boiler inlet temperature. System Supply Temperature - This is the water temperature as measured by the system supply sensor located in the downstream piping (if connected). System Return Temperature - This is the water temperature measured by the system return sensor located in the upstream piping (if connected). HWG Temperature - This is the temperature as measured by the tank sensor in the hot water storage tank (if connected). Flue Temperature - Temperature measured by the flue sensor. Time - The time is displayed in the lower left-hand corner of the display. Reference this manual for Night Setback parameters and more information regarding adjusting the date and time. Boiler Status button - Pressing this button brings up the Boiler Status Screen. This screen shows the status of the various safeties, inputs, and outputs to the control module. Reference this manual for more information regarding this screen. Main Menu button - Pressing this button brings up the Main Menu Screen. From this screen navigation to nine (9) other screens is possible. Modulation button - Pressing this button brings up the Modulation Screen. This screen shows overall boiler modulation, individual fan speeds, and flame currents. Modulation Percentage - Displays the current boiler firing rate. Outside Air Temperature - This is the outdoor air temperature (if connected). 1 Service 8 Service Manual GAS PRESSURE SWITCHES HWG THERMOSTAT / SENSOR ENABLING DEVICE SYSTEM SENSOR - SUPPLY OUTDOOR SENSOR SEQUENCER / BUILDING MANAGMENT SYSTEM LOW VOLTAGE CONNECTION BOARD INLET TEMPERATURE SENSOR OUTLET TEMPERATURE / HI-LIMIT SENSOR FLUE GAS SENSOR LOUVER PROVING SWITCH FLAME SENSOR 1 & 2 LOW WATER CUTOFF BLOCKED DRAIN SWITCH DISPLAY PANEL PC INTERFACE SMART CONTROL MODULE AIR PRESSURE SWITCH SYSTEM SENSOR - RETURN AUX SWITCH 1 & 2 0-10 INPUT FROM SYSTEM PUMP BLOWER PROVING SWITCHES CASCADE INLET AIR SENSORS MANUAL RESET HIGH LIMIT VENT DAMPER PROVING SWITCH MODBUS BOARD Control inputs 1 Service Service Manual 9 (continued) LOW VOLTAGE CONNECTION BOARD SMART CONTROL MODULE ALARM CONTACTS LOUVER RELAY RUN TIME CONTACTS SEQUENCER / BUILDING MANAGMENT SYSTEM BOILER PUMP CONTACTOR SYSTEM PUMP CONTACTOR HWG PUMP CONTACTOR IGNITOR BLOWERS GAS VALVES BOILER RATE OUTPUT DISPLAY PANEL PC INTERFACE 120V SUPPLY SYSTEM PUMP BOILER PUMP DHW PUMP MAX. 1.5 AMPS PER CONNECTION N L FIELD SUPPLIED CONTACTOR MUST BE INSTALLED LINE VOLTAGE TERMINAL STRIP 0-10V OUTPUT TO BOILER PUMP VENT DAMPER Control outputs Service Manual 1 Service General Operation How the boiler operates The Crest uses an advanced stainless steel heat exchanger and electronic control module that allows fully condensing operation. The blowers pull in air and push flue products out of the boiler through the heat exchanger and flue piping. The control module regulates blower speeds to control the boiler firing rate. The gas valves sense the amount of air flowing into the boiler and allow only the right amount of gas to flow. How the control modules operate The Crest boiler is equipped with a SMART TOUCH control module. The SMART TOUCH control module receives inputs from boiler sensors and external devices. The control module activates and controls the blowers and gas valves to regulate heat input and switches the boiler, Hot Water Generator (HWG), and system pumps on and off as needed. The user programs the control module to meet system needs by adjusting control parameters. These parameters set operating temperatures and boiler operating modes. Sequence of operation Table 1A (page 12) shows control module normal sequences of operation for space heating and HWG operation. The combined operation sequence is for a typical application, programmed to provide HWG priority. Access modes User The USER can adjust various space heating and HWG operating variables: -Navigate to the Initial Setup Screen (FIG. 1-5). -From the Home Screen (FIG. 1-1), press MAIN MENU, then press SETUP on the Main Menu Screen (FIG. 1-2). -Press ENTER on the Password Screen (FIG. 1-3) (do not enter any values) and then press INITIAL SETUP on the Setup Screen (FIG. 1-4). The USER can set the date and time and adjust temperature set points, and outdoor reset points. Under the ADVANCED SETUP menu, the USER can change the TEMPERATURE UNITS and the LCD BACKLIGHT TIMER. Installer Most parameters are available only to the INSTALLER, accessible only by entering the installer password (5309) in the Password Screen (see the User Section). Figure 1-1 Home Screen Figure 1-2 Main Menu Screen Figure 1-3 Password Screen Service Manual 1 Service (continued) F...

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