Viessmann VITOTRONIC 200 Service Instructions Manual page 139

Refrigerant circuit
(cont.)
Pos. Refrigerant circuit in heating mode
Evaporation temperature in °C
J
Value highlighted white: Set evaporation tem-
perature in °C
Air discharge temperature in °C
K
—
L —
Suction gas superheating in K
M
Value highlighted white: Set suction gas su-
perheating in K
Value underlined: Suction gas superheating
control active
Electronic expansion valve:
Refrigerant circuit in heating mode, heat gen-
eration at condenser
Electronic expansion valve opening in %
N
Liquid gas temperature in °C
S
Secondary circuit return temperature in °C
T
Condensing temperature in °C
U
V Speed, circulation pump for cylinder heating or cylinder loading pump in %
Secondary pump speed in %
W
Secondary pump, circulation pump for cylinder heating or cylinder loading pump
Animated symbol: Pump is running.
Refrigerant circ ctrllr
Only for heat pumps with an electronic expansion
valve and refrigerant circuit controller [4].
The following information can be called up:
■ Refrigerant circuit temperature and pressure values
Refrigerant circuit operating conditions
■
1. Service menu:
Press and hold OK +
approx. 4 s.
[4]
simultaneously for
å
Refrigerant circuit reversal
Condensing temperature in °C
Symbol flashes: Defrost active
Liquid gas temperature
—
(flashes)
Refrigerant circuit reversal active (cooling
mode/defrosting)
—
Evaporation temperature in °C
2. "Diagnosis"
3. "Refrigerant circuit"
4. "Refrigerant circuit controller"
Notes
The symbols on the display are animated if the com-
■
ponents are operational (e.g. pumps).
■ The values shown are examples.
Diagnosis
139