Baxi Power HT 1.850 Installation, Operation And Maintenance Manual page 95

c) with AGU2.500 for control of a low temperature system:
Refer to the instructions provided with the AGU2.500 accessories for connection and control of a low tempe-
rature zone.
The electrical connection and settings needed to control a system divided into zones vary depending on the
accessories connected to the boiler.
a) Without QAA73 room temperature control device:
The contact relating to the request for operation of the various zones must be parallel-connected and connected
to terminal 3-4 "TA" of terminal block M2 in figure 10. The jumper present must be removed.
The central heating temperature is selected directly on the boiler control panel in accordance with the instruc-
tions provided for the user in this manual.
b) with QAA73 room temperature control device:
The pump relating to the room controlled by the QAA73 temperature control device must be supplied with
electricity by means of terminals 11-12 of terminal block M3 in figure 10.
The contact relating to the request for operation of the other zones must be parallel-connected and connected
to terminal 3-4 "TA" of terminal block M2 in figure 10. The jumper present must be removed.
The central heating temperature of the zone controlled by the QAA73 is set automatically by the QAA73 it-
self.
The central heating temperature of the other zones must be selected directly on the boiler control panel.
IMPORTANT: For systems divided into zones, parameter 80 "HC2 gradient", which can be set on the
QAA73 temperature regulator, must be set as —.- "not active" (see section 12.4).
CIRCULATING
Figure 10
c) with AGU2.500 for control of a low temperature system:
Refer to the instructions provided with the AGU2.500 accessories for connection and control of a low tempe-
rature zone.
In this case some electronic parameters must be modified (see §14).
12.6 CONNECTING A ZONE SYSTEM
BOILER
PUMP
INSTRUCTIONS PERTAINING TO THE INSTALLER
2 ZONE 3 ZONE
(ROOM THERMOSTAT) (ROOM THERMOSTAT)
1 ZONE
1 ZONE PUMP
95
n ZONE
(ROOM THERMOSTAT)
IT
AT
GB