Superheating; A Mop Limit; B Evi Hot Gas Temp - Viessmann VITOCAL WPR 300 Service Instructions Manual

Compressor control settings
5019 Superheating §
Suction gas - set superheating temperature.
The temperature of the suction gas is
raised to prevent the compressor
drawing in any drops of liquid. This is
carried out by optimising the expan-
sion valve control and/or by an inter-
mediate heat exchanger.
If this value cannot be reached in
operation, the EEV controller optimi-
sation algorithm matches the set
value specified here until superheat-
ing is almost constant. The end value
for automatic set value matching is 6
K.
501A MOP limit §
Maximum evaporator operating pressure (MOP).
If the pressure in the evaporator
exceeds this value, the control unit
switches from superheating to suction
pressure control. After the pressure
has dropped below this value, the
control unit resets the original state.
In the delivered condition, the values
for the various heat pumps are differ-
ent. The maximum value that can be
set depends on the application limit of
the compressor used.
501B EVI hot gas temp. §
Set hot gas temperature for heat pumps with EVI vapour injection ("Enhanced
Vapour Injection").
102
Note
Changing the parameters is appropri-
ate if, for example, refrigerant super-
heating in the evaporator should be
adjusted.
Menu
& "Device settings"
& "Programming"
& "Compressor"
&

"Superheating"

Delivered condition
Setting
Menu
& "Device settings"
& "Programming"
& "Compressor"
& "MOP limit"
Delivered condition
Setting
3 K
3 to 25.5 K
6.6 bar(a)
0.2 to 19 bar
(a)