ECA644
GB
16
Wiring diagram
H2*
water temperature probe 10 kΩ
H4*
cold water temperature probe 10 kΩ (only ECA
647)
AIR
air temperature probe 10 kΩ
M1
fan motor DC inverter
S1
grill safety micro-switch
Y1
water solenoid valve (230V/50Hz 1A powered
output)
Y2
cold water solenoid valve (only ECA647 versions)
or mobile flap connection (only ECA644 versions).
230V/50Hz 1A powered output
L-N
230V/50Hz electrical power supply connection
BO
boiler go-ahead output (free contact max 1A)
CH
chiller go-ahead output (free contact max 1A)
CP
presence sensor input (if closed, the fan coil goes
into stand-by.)
HRS
RS water probe (2kΩ) (only for ECA644 versions)
RS
RS version wiring (only for ECA644)
*
If after powering the equipment the board detects
the probe, the start-up will take place under normal
conditions with minimum water temperature in
heating (30°C) and maximum water temperature
in cooling (20°C) functions.
The board can also operate without probe, case in
which the minimum and maximum thresholds will
be ignored.
