Compressor Travel - Viessmann VITOTRONIC 200 Service Instructions Manual

Diagnosis
Refrigerant circuit
Pos. Refrigerant circuit in heating mode
Evaporation temperature in °C
L
Value highlighted white: Set evaporation tempera-
ture in °C
—
M
—
Electronic expansion valve:
Refrigerant circuit in heating mode, heat genera-
tion at condenser
Refrigerant circuit protection functions
N
0/0 No protection active
1/4 High pressure protection
1/8 Protection against excessively high hot gas
temperature
1/16 Constant fan speed when evaporation tem-
perature is too high
1/32 Reduced fan speed when evaporation tem-
perature is too high
1/64 Application limits of outdoor unit are excee-
ded or undershot.
1/128 Reduced compressor speed if high pres-
sure limit has been reached.
1/256 Increased compressor speed if low pres-
sure limit has been reached.
Note
Multiple protection functions can be active simultaneously.
Example 1/36:
1/4 High pressure protection
1/32 Reduced fan speed when evaporation temperature is too high
Electronic expansion valve opening in %
O
Liquid gas temperature in °C
P
Secondary circuit return temperature in °C
R
Condensing temperature in °C
S
Cylinder loading pump speed in %
T
Secondary pump speed in %
U
Secondary pump, cylinder loading pump
Animated symbol: Pump is running.

Compressor travel

The diagram consisting of evaporation and condensing
temperatures shows the compressor runtimes.
The area of the diagram is divided into a rectangular
grid. While the compressor is running, the operating
point of the refrigerant circuit moves through this grid.
The control unit constantly adds the dwell times "trun"
of the operating point in the individual grid fields.
146
(cont.)
Refrigerant circuit reversal
Condensing temperature in °C
Symbol flashes: Defrost active
Liquid gas temperature
(flashes)
Refrigerant circuit reversal active (cooling mode/
defrosting)
Refrigerant circuit protection functions
0/0 No protection active
1/1 Frost protection, secondary circuit flow
1/2 Frost protection, refrigerant circuit
1/4 High pressure protection
1/8 Protection against excessively high hot gas
temperature
1/64 Application limits of outdoor unit are excee-
ded or undershot.
1/128 Reduced compressor speed if high pressure
limit has been reached.
1/256 Increased compressor speed if low pressure
limit has been reached.
1/512 Increased fan speed when condensing tem-
perature is too high
—
Evaporation temperature in °C
Depending on the dwell time, the grid is shown in vari-
ous shades of grey:
■ trun = 0 min: Black
■ 0 < trun 240 min: 6 different shades of grey
≤
■ trun > 240 min: White
Based on the compressor application limits shown, it is
possible to see whether and how often the application
limits of the refrigerant circuit parameters have been
exceeded during operation.