Zenner zelsius C5-ISF Notice D'installation Et D'utilisation page 63

VOLUME METERS C1/C2IN CONNECTION
The inputs C1 IN (51, 52, 53) and C2 IN (54, 55, 56) are dedicated to the flowmeters for hot and cold
sanitary water.
The heat meter is compatible with flowmeters with pulse output OC (open collector) or OA (reed), with
pulse value "liters/pulse" (strictly compliant to the value set on the meter).
Terminals 53 and 56 are reserved for eventual Anti-tampering wire connection.
Warning: when using flow meters with Open-Collector (OC) output, it is necessary to follow the correct
connection polarity.
GE552Y215-6-7 User Manual v1.9.1
ENG - 11