Baxi LUNA HT 1.850 Installers And Users Instructions page 26

BOILER
CIRCULATING
PUMP
Figure 11
c) with AGU2.500 device for control of a low temperature system:
Refer to the instructions provided with the AGU2.500 accessories for connection and control of a low temperature zone.
In this case the set of some electronic parameters have to be modified (see § 15: H552-H553-H632).
H552=50 H553=12 H632=00001111
13.6 CONNECTING THE PUMP – HOT WATER CIRCUIT
The domestic hot water pump (P3), which directs flow into an eternal storage tank, is connected to terminals 13-14 of
boiler terminal strip M3 (figure 12).
The electrical specifications of the pump must be as follows:
230 V AC; 50 Hz; 1 A max; cos f > 0.8.
If the specifications of the installed pump are different, a relay must be wired between the boiler control circuit board and
the pump.
Remove the resistor from terminals 9-10 of terminal strip M2 (figure 12), and connect the hot water priority NTC sensor,
which is supplied as an accessory.
The sensing element of the NTC device must be located in the recess provided on the storage tank (figure 12).
The temperature and on-off programming of the domestic hot water supply are selected directly from the boiler control
panel, as described in this manual under the user instruction headings.
In the case of a zone system it is necessary to add a relay in between to cut off the supply of the zone pumps during the
DHW mode, as shown in the diagram of figure 11.
INSTRUCTIONS PERTAINING TO THE INSTALLER
2 ZONE
(ROOM THERMOSTAT)
2 ZONE-
PUMP
1 ZONE
(QAA73)
1 ZONE PUMP
HEATING CUT-OUT
RELAY
26
3 ZONE
n ZONE
(ROOM THERMOSTAT)
(ROOM THERMOSTAT)
3 ZONE- N ZONE-
PUMP PUMP
WATER TANK
PUMP
910.024.1 - EN (AUS)