Viessmann Vitoclima 300-S Service Instructions For Contractors page 45

External units
(cont.)
Type OT307H
A Power supply PCB
B Defrost heater, 230 V~ (option)
C Four-way reversing valve
D Fan voltage
E Compressor
*1
Not applicable to type OT307H.
Connection and wiring diagrams
F Electronic expansion valves
(EEV) for the refrigerant circuits
*
A, B, C 1 and D
G Fan speed sensors
H Additional connection (e.g. PC for
software update)
K Wet steam temperature sensor
45