Overview Of Internal Components - Viessmann Vitocal 300-A Installation And Service Instructions For Contractors

Troubleshooting
Repairs
(cont.)

Overview of internal components

A
Y
X
W
V
U
A Low pressure sensor
B Electronic expansion valve for suc-
tion gas superheating (AHX)
C Electronic expansion valve for con-
trolling fill level of refrigerant collec-
tor (PHX)
D Filter dryer
E Manual air vent valve
F 4-way diverter valve
G Safety high pressure switch
80
B C D
T S R QP
E F
O
H Schrader valve, high pressure side
K High pressure sensor
L Secondary circuit return tempera-
ture sensor (Pt500A)
M Drain valve
N Flow switch
O Liquid separator
P Liquid gas temperature sensor
(downstream of condenser)
(NTC 10 kΩ)
G
H
K
N M L