6 domestic hot water operation, 7 keep hot facility, Pc interface – Atmos Energy INTERCOMBI HE32 User Manual
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determined by the weather dependent control programmed in the
controller.
During CH operation, the demanded CH supply temperature is displayed
on the operating panel.
During CH operation, the actual CH supply temperature can be read by
pressing the service button.
Note: Instead of an on/off thermostat, an OpenTherm thermostat can be
connected to the controller as described in §5.4.1. In this case, the
desired CH temperature is set by the thermostat. The minimum
temperature and the operation mode can be set with parameters [E] and
[E.] (refer to §7.3)
6
Domestic hot water operation
The hot water supply has priority over the heating. When the flow switch
detects a domestic hot water demand of more than 2 l/min, the fan starts
running (code
3
) and ignition of the burner follows (code
4
), and the
controller goes to domestic hot water operation (code
6
). When a
domestic hot water demand is detected during a CH demand, the CH
demand is interrupted (pump stops), and the controller switches from
CH(code
5
) to DHW (code
6
). When after ending the domestic hot
water demand, the CH demand is still required, the pump starts again
and the controller switches back to CH.
During domestic hot water operation, the fan speed and hence the
power of the appliance is controlled by the controller on the basis of the
set domestic hot water temperatures. The demanded temperature is
displayed on the operating panel.
During domestic hot water operation, the actual domestic hot water
supply temperature can be read by pressing the service button.
7
Keep Hot Facility
For a quick supply of domestic hot water, a Keep hot function has been
provided in the controller. This function keeps the heat exchanger at the
correct temperature. This Keep hot function has the following settings:-
•
Off: (HW Store - Both LED’s off.) The heat exchanger is not kept
warm, delaying the supply of domestic hot water, except when CH
operation has recently occurred.
•
On: (HW Store – On LED on.) The Keep hot function of the
appliance is continuously activated. The appliance always supplies
domestic hot water immediately.
•
Eco: (HW Store - Eco LED on) The Keep hot function is self-
learning. The appliance is inactivated during the night or after a
long absence. The appliance adjusts to the user pattern of the
domestic hot water requirements. The eco mode is the most
efficient hot water method.
Note: The initial ‘slug’ of hot water may be in excess of 60ºC irrespective
of the settings.
2.4
PC interface
The controller has an interface for a PC. With a special cable and
accompanying software, a PC can be connected. This provision makes it
possible to follow the behaviour of the controller, the appliance and the
heating system during a long period.
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