Viessmann VITOTRONIC 200 Service Instructions Manual page 141

Refrigerant circuit
(cont.)
Pos. Refrigerant circuit in heating mode
Evaporation temperature in °C
K
Value highlighted white: Evaporation temperature,
set value in °C
Air discharge temperature in °C
L
—
Electronic expansion valve for suction gas super-
heating (AHX):
Refrigerant circuit in heating mode, heat genera-
tion at condenser
Electronic expansion valve opening for suction gas superheating in %
M
Suction gas superheating in K
N
Value highlighted white: Suction gas superheating,
set value in K
Value underlined: Superheating control for suction
gas active
Refrigerant collector level
O
Value underlined: Fill level control active
P Intermediate injection solenoid valve
Refrigerant collector temperature
Q
Supercooling of the liquid gas in K
R
Value highlighted white: LPG supercooling, set
value in K
Value underlined: Supercooling control for LPG
active
Electronic expansion valve for refrigerant collector
level control (PHX):
Refrigerant circuit in heating mode, heat genera-
tion at condenser
Electronic expansion valve opening for refrigerant collector level control in %
S
Liquid gas temperature in °C
T
Secondary circuit return temperature in °C
U
Condensing temperature in °C
V
Cylinder loading pump speed in %
W
Speed of secondary pump or circulation pump for cylinder heating in %
X
Secondary pump or circulation pump for cylinder heating
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 and hold OK +
approx. 4 s.
2. "Diagnosis"
[4-3]/[4-4]
simultaneously for
å
Refrigerant circuit reversal
Condensing temperature in °C
Symbol flashes: Defrost active
(flashes)
Refrigerant circuit reversal active (cooling mode/
defrosting)
—
—
(flashes)
Refrigerant circuit reversal active (cooling mode/
defrosting)
Evaporation temperature in °C
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
141