Connection An External Boiler - Baxi ECO 3 Instructions Manual

When the external probe is connected, the heating circuit temperature control device (2 - figure 1), regulates the dispersal
coefficient kt (Figure 18).
The figures below show the relation between knob position and curves. Intermediate curves may also be set.
Figure 18
iMportant: the tM delivery temperature value depends on the position of the jumper or the switch T.RISC. (section 23).
The maximum possible temperature setting is 85 or 45°C.
27. COnnECtInG an ExtERnal BOIlER
For models 1.240 Fi - 1.240 i
IMPORTANT: jumper CN7 must be jumpered (see paragraph 32).
Connect the boiler water pipes as shown in figure 19.
Remove the resistor from terminal board and connect the optional DHW priority sensor to them.
Insert the sensor's probe in the relevant hole in the boiler.
Set domestic hot water temperature (5°...60 °C) using the control knob
Legend
uB DHW boiler unit
ur central heating unit
V3V external three way valve
M2 terminal block
sB DHW priority sensor
Mr central heating delivery
MB
DHW delivery
rr central heating/DHW return
rB
resistor, to be removed
external 3 way valve connection
Figure 19
instructions pertaininG to the
instaLLer
20
tM
tM = Range delivery temperature
te = external temperature
(1 - figure 1).
3 WaY VaLVe anD D.K.W. prioritY
sensor terMinaL BLocK.
te
924.674.3 - GB