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9.3 WRG 300 / 400 EC + RLS 2 F +
WRH in the supply air channel
Protection of a hydraulic heat register
against frost damage.
A hydraulic heat register must be protected
against frost damage with a safety device.
1 = Exhaust air
2 = Supply air
3 = Outgoing air
4 = Outside air
R1
Temperature sensor
WRH Water air heater