Intergas Heating Ltd
13
5
CH operation
An on/off thermostat, an OpenTherm thermostat, an external sensor or a combination of
the latter can be connected to the boiler controller.
When a request for heat is received from a thermostat, the fan is started (code
3
),
followed by ignition (code
4
) and CH operating mode (code
5
).
During CH operation the fan speed and hence the appliance power are controlled by
the boiler controller so that the CH water temperature reaches the desired CH supply
temperature.
If an on/off thermostat is connected, this is the CH supply temperature set on the
display. In the case of an OpenTherm thermostat the desired CH supply temperature is
determined by the thermostat. In the case of an external sensor the desired CH suppply
temperature is determined by the heating line programmed in the boiler controller. For
the latter two, however, the maximum is the temperature set on the display.
During CH operation the requested CH supply temperature is indicated on the operating
panel.
The CH supply temperature can be set between 30°C and 90°C.
4.4
Clock function (heat only)
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.
N.B. The clock function is only applicable when using the boilers as “heat only”. When using the
boiler in combination with an external DHW tank, for example in an S or Y plan wired installation
the clock must be set to C-on.
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.
4.5
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.
