Baxi Potterton WH65, WH46 manual Connecting the QAA73 Temperature Regulator, Fault messages

14.4 CONNECTING THE QAA73 TEMPERATURE REGULATOR

The SIEMENS model QAA73 room temperature regulator, if required (optional extra) must be connected to terminals 1-2 of terminal board M2 in figure 13.

The link across terminals 3-4, provided for connection of a room temperature thermostat, must be removed. The settings of the domestic hot water temperature and domestic hot water production schedule must be made using this device.

The timed program of the central heating circuit must be set on the QAA73 if there is a single zone, or in relation to the zone controlled by the QAA73 device.

The timed program for the central heating circuit of the other zones can be set directly on the boiler control panel.

See the instructions provided with the QAA73 room temperature regulator for the user parameter programming procedure.

IMPORTANT: For systems divided into zones, parameter 80 “HC2 curve”, which can be set on the QAA73 temperature regulator, must be set as _ _ . _ “not active”.

QAA73: parameters which can be set by the installation engineer (service)

By pressing the two PROG buttons together for at least three seconds it is possible to access the list of pa- rameters that the installer can display and/or set.

Press either of these buttons to change the parameter to display or change. Press the [+] or [-] key to change the value displayed.

Press either of the PROG buttons again to save the change. Press the information button (i) to quit programming.

Here follows a list of the most commonly used parameters:

Line no.	Parameter		Range	Default value
70	HC1 curve		2.5…40	15
	Selection of central heating circuit temperature curve “kt”
72	HC1 max. output		25…85	85
	Central heating system maximum output temperature
74	Type of building		Light, Heavy	Light
75	Room compensation		on HC1	On HC1
	Activation/deactivation of the influence of the room temperature. If it is deactivated, the outdoor		on HC2
	temperature sensor must be installed.		on HC1+HC2
			nil
77	Automatic adaptation of the temperature curve “kt” in relation to the room temperature.		On - off	On
78	Opt Start Max		0…360 min	0
	Maximum time the boiler is switched on ahead of the timed program to optimise the temperature
	in the premises.
79	Opt Stop Max		0…360 min	0
	Maximum time the boiler is switched off ahead of the timed program to optimise the temperature
	in the premises.
80	HC2 curve		2.5…40	—.-
			—.-= not active
90	DHW Red Setp		10 or 35…58	10
	Minimum temperature of the domestic hot water
91	DHW program		24 h/day	24 h/day
	Selection of the type of timed program for domestic hot water.		TSP HC-1h
	24 h/day	= always on	TSP HC
	PROG HC-1h	= as HC1 central heating program less one hour	TSP DHW
	PROG HC	= as central heating program
	PROG DHW	= specific domestic hot water program (see also program lines 30-36)

- fault messages

In the event of fault, the display panel on the QAA73 shows the flashing symbol . Press the information key () to display the error code and a description of the fault (see Fault warning tables on paragraph 3.9).

INSTRUCTIONS PERTAINING TO THE INSTALLER 24 926.772.1 - GB/IE