Viessmann VITOTRONIC 200 Service Instructions Manual page 143

Refrigerant circuit
(cont.)
Pos. Refrigerant circuit in heating mode
Suction gas superheating in K (downstream of
P
evaporator)
Position on evaporator (as shown in fig 29)
Set value, suction gas superheating in K (down-
Q
stream of evaporator)
Position on evaporator (as shown in fig 29)
Electronic expansion valve:
Refrigerant circuit in heating mode, heat genera-
tion at condenser
Suction gas superheating in K (upstream of compressor)
R
Electronic expansion valve opening in %
S
T —
U LPG temperature in °C
V —
Secondary circuit return temperature in °C
W
"tc:" Condensing temperature in °C
X
Cylinder loading pump speed in %
y
Secondary pump speed in %
Z
Secondary pump, cylinder loading pump
Animated symbol: Pump is running.
Refrigerant circ controller
The following information can be called up:
■ Refrigerant circuit temperature and pressure values
■ Refrigerant circuit operating conditions
1. Service menu:
Press OK + simultaneously and hold for
å
approx. 4 s.
2. "Diagnosis"
[4-6] / [4-7]
3. "Refrigerant circuit"
4. "Refrigerant circ controller"
Notes
■
■
Refrig. circ reversal
—
—
(flashes)
Refrigerant circuit reversal active (cooling mode/
defrosting)
Set suction gas superheating in K
Evaporation temperature in °C
Suction gas superheating in K
"t0:" Evaporation temperature in °C
The symbols on the display are animated if the com-
ponents are operational (e.g. pumps).
The values shown are examples.
Diagnosis
143