7 Pre-heating facility To enable fast delivery of domestic hot water the boiler controller is equipped with a DHW comfort function. This function maintains the temperature of the heat exchanger to a pre defined temperature. The DHW comfort function has the following settings: On: ( LED on) The appliance’s DHW comfort function is switched on continuously. In this mode the heat exchanger will be kept on temperature to assure instant delivery of DHW. Eco: ( LED on) The appliance’s DHW comfort function is self learning. The appliance will adapt to the patttern of use of the hot water tap.
As a result, the temperature of the heat exchanger will not be maintained during the night or in case of lengthy absence. Note: Some Open Therm room thermostats support the function of enabling or disabeling the pre-heat function (see § 10.4 for detailed instructions ) Off: (Both LEDs off) The temperature of the heat exchanger is not maintained, as a result of which the delivery of hot tapwater takes a little time. If there is no need for fast delivery of hot tapwater, the DHW comfort function can be switched off. 4.5 Clock function The boiler is equipped with a digital clock and offers the possibility to program 4 points in time to switch from CH off or CH on.
During the “clock active” periods the boiler will respond on CH demands from the room thermostat. During the “clock inactive” periods the boiler will not respond on CH demands. Additionally the following special modes can be chosen: 1. t-on (temporary on). The boiler will respond to every CH demand from the room thermostat until the next switch moment. 2. c-on (continuous on). The boiler will respond to every CH demand from the room thermostat without any time limit. 3. OFF . The boiler will not respond to any CH demand from the room thermostat. Note For setting and adjusting the clock see § 9.3 Setting and adjusting the clock functions.
4.6 PC interface The boiler controller is equipped with an interface for a PC, which can be connected by means of a special cable and associated Intergas Diagnostic Software (IDS). This facility allows the behaviour of the boiler controller, the appliance and the heating installation to be monitored over a longer period. 4.7 Test programs The boiler controller has a facility for placing the appliance in test mode. Activation of a test program will result in the appliance starting operation at a fixed fan speed, without the control functions being actuated. The safety functions do remain active.
The test program is ended by pressing the and simultaneously or will end automaticaly after 10 minutes. Test programs Addition readings : During test mode the following data can be read : By pressing the button continuesly in the display the CH water pressure is shown. By pressing the button continuesly in the display the ionisation current is shown. Intergas Heating Ltd 14 Program description Button combinations Display reading Burner on at minimum power and “L” Burner on with maximum CH power setting (See § 10.3, parameter 3) and (1x) “h” Burner on with maximum DHW power (See § 10.3 , parameter 4) and (2x) "H" Switch off test program and Actual situation