Baxi PRIME HT 240 Installers And Users Instructions page 21

15.5 CONNECTING AN EXTERNAL BOILER (FOR MODELS PRIME HT 1.120 – 1.240 – 1.280)
Boiler models PRIME HT 1.120 – 1.240 – 1.280 feature a three way power valve for connecting an external boiler.
Connect the boiler water pipes as shown in figure 16.
Remove the resistor from terminals 9-10 of terminal board M2, and connect the optional DHW priority sensor to them
(figure 16).
Insert the sensor's probe in the relevant hole in the boiler.
Set domestic hot water temperature using the control knob 7, figure 1 on the boiler's front panel.
LEGEND
UB: DHW boiler unit
UR: central heating unit
V3V: three way valve
M2: terminal board
SB: DHW priority sensor
MR: central heating delivery
MB: DHW delivery
RR: central heating/DHW return
RB: resistor, to be removed
Figure 16
NOTE: legionella function is active (factory set = ON; see section 26 parameter 555.1).
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INSTRUCTIONS FOR THE INSTALLER