Technical data

88
CTC EcoZenith i550 Pro
For the installer
13.3.1 CTC EcoZenith i550 Pro - Radiator system
The CTC EcoZenith i550 Pro can be connected to three different radiator
systems (heating circuits) with separate room sensors.
Mixing valve (Y1) is the main mixing valve and feeds radiator system 1. Mixing
valves (Y2) and (Y3) for radiator systems 2 and 3 are sub-mixers. This means
that mixing valve (Y1) controls the maximum temperature to mixers (Y2) and (Y3).
For one or two sub-mixing valves (radiator systems 2 and 3) to be operative
when radiator system 1 is not operative, valve (21) must be connected to
radiator pump (G1) so that the valve closes when the radiator pump for radiator
system 1 is not operative. This is useful, for example, if floor heating in a
bathroom is preferred during the summer.
Note that the expansion vessel and safety valve for the heating system are not
included in the schematic diagram.
See also Heating circuit Menu in the Detail Description Menus chapter.
(Installer/Settings/Heating circuit 1-3)
E5
Y1
IN 3
IN 2
IN 1
OUT
B7
B1
G1
Y2
Y3
B3
G3
10
09
B2G2
21
08
RAD.SYS 1
RAD.SYS 2
RAD.SYS 3
02
11
01
EL 1-3 a/b
E1/E4
B33
B6
B5
B15
B11
B12
B13
!
Valve 21 must
be connected if
radiator system 2
or 3 is used.