IBC DC 23-84 Installation And Operating Instructions Manual

IBC DC 23-84 Installation And Operating Instructions Manual Manual pdf 63 page image

5-3TROUBLESHOOTINGDC SERIES COMBI BOILERS DC 23-84, DC 29-106, DC 33-124, DC 33-1605.2.2 Fan/BlowerOperating power is provided by means of a separate 120 VAC connector at theupper right side of the fan (white/black/green). Control of the fan is provided via afour lead connector at the bottom of the fan.5.2.3 Thermostat ConnectionsThe boiler controller is designed to heat a single space heating load. The load canconsist of a single zone or several zones. In either case the ‘Call for Heat’ must befrom a device providing a DRY CONTACT and connected to X4.6 and X4.7. The useof power robbing thermostats directly will cause the boiler to operate erratically. If apower robbing thermostat is to be used it will have to be isolated through a relay.5.2.4 Water Pressure SensorThe water pressure is displayed in the main display when the pressure is low.For example a system water pressure of 4.6psi would be displayed as 4.6P. If thepressure is too low the controller will flash an error message in the main displayby toggling between the actual pressure and LO. Simply increase the systempressure to correct this error.TO TEST THE OPERATION OF THE PRESSURE SENSOR1. Turn off the boiler at the controller by pressing the button. The currentsystem pressure will be displayed.2. Isolate the space heating circuit and reduce the water pressure. Thedisplayed water pressure should drop as the system water is being removed(expansion tank isolated). If the pressure is remaining steady then thepressure sensor may be block or faulty. If it remains “fixed”, drain boiler andreplace sensor, or dislodge any blocking debris from sensor inlet channel andreinsert.3. If the pressure sensor is OK then simply refill the boiler and open the closedvalves. Ensure the system pressure is adequate for the heating system.PRESSURE SENSOR REPLACEMENT1. Turn off the power to the boiler.2. Isolate and drain the boiler.3. Remove the Vent Stack.4. Disconnect the electrical connection to the sensor.5. Carefully remove the clip at the base of the sensor.6. Twist the sensor as you are pulling to remove from the socket. There maybe some water leakage at this point. Ensure the water does not spill into thecontroller.7. Push the new sensor into the socket while twisting slightly. Careful not todamage the O-ring.8. Reinstall the clip at the base of the sensor to ensure the sensor does notcome out when the boiler is pressurized.9. Connect the electrical connector to the sensor.10. Reinstall the vent stack.11. Restore water pressure to the boiler.12. Restore power to the boiler.Fan Power and Control PlugsDomestic Water Flow SensorWater Pressure Sensor