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3.4.
Hydraulic hub chart for water heater in the NW module
NWS – W / NWL - W
ZK --- shut-off valve
ZO --- vent valve
ZD --- drain valve
TM --- temperature sensor
ZR --- regulating valve
FS --- mesh filter
Z3d --- 3-way valve with actuator
To avoid water exchanger damage caused by freezing, if electrical power is not available, glycol must be used as a
refrigerant.
Units with the NWS / NWL module are equipped with a passive frost protection system when the heater is installed in
the supply air module and with an active and passive frost protection system when the heater is installed in the section
above the roof.