Overview Of Internal Components; Draining The Heat Pump On The Primary/Secondary Side; Checking The Sensors - Viessmann Vitocal 300-G Series Installation And Service Instructions Manual

Maintenance

Overview of internal components

U A
T
S
R
Q
P
O
N
M
L
K
Fig. 41
Secondary circuit return
+
Secondary circuit flow
+
Primary circuit flow (heat pump brine inlet)
Primary circuit return (heat pump brine out-
let)
Primary circuit flow temperature sensor (heat
A
pump brine inlet)
Suction gas temperature sensor
B
Condenser
C
High pressure sensor EEV
D
Secondary circuit flow temperature sensor
E

Draining the heat pump on the primary/secondary side

1. Shut off the connection to the heating network.

Checking the sensors

For sensor connections to the controller and sensor
PCB: See page 31.
64
B C E D F F G
H
Compressor
F
Secondary circuit return temperature sensor
G
Drain valve on the secondary side
H
Sight glass
K
Electronic expansion valve EEV
L
Drain valve, primary side
M
Filter dryer
N
Primary circuit return temperature sensor (heat
O
pump brine outlet)
Hot gas temperature sensor
P
High pressure Schrader valve
Q
Low pressure sensor EEV
R
Safety high pressure switch
S
Low pressure Schrader valve
T
Evaporator
U
2. Drain the heat pump at the primary/secondary side
drain valve: See page 64.
For the position of the sensors in the heat pump: See
diagram on page 64.