2020/07/23 page 11
OPERATIONAL MODE REQUEST “COOLING=C“, “HEAT PUMP=H“
Input terminals “MODE C/H” - Logic input (voltage-free contact)
When the contact “0V+DI1“ is closed (terminals 13+14), the communication module sends a request to switch
the compressor unit from “cooling” mode to the “heat pump” mode = H“.
When the contact is off/open the communication module will send a request to switch the operational mode
from “heat pump” back to the “cooling mode = C“.
“POWER LEVEL REQUEST”
A request for power level may be executed through an analogue signal 0…10VDC or through 3 logic inputs
(voltage free contacts).
To directly influence the output (change of evaporating temperature in cooling mode/change of condensing
temperature in heat pump mode) it is necessary to install a capacity limitation module at the same time.
1.
Input terminals “POWER 0…10V“
(terminals 11+12) – analogue signal
0…10V (0V = no request for power
level, 10V = maximum power level
request). The current power request is
shown on the right side of the display
module using 8 codes (“C0…C7“ or
rather “H0…H7“).
The power request algorithm requires at
least "C1"/"H1" code (i.e. at least 1.5V) to
activate the compressor unit.
The power request algorithm requires at
least "C0"/"H0" code (that means maximum
1.3V) to stop the compressor unit
.
Fig.6 –
Control diagram – Power request for analogue input
(Operational mode through logic input)
\
Power control
Level 1 to 7
Cool / Heat
Start / Stop
I&C
