Danfoss AK-PC 781A User Manual page 121

Settings in MT controller
AK-PC 781A
Initiates coordination with the IT
controller.
- Relay output, which emits signals.
- DI input, which receives signals
when the IT compressor is running.
The Vrec valve's opening degree
when the parallel compression is to
start.
The start signal is first emitted when
the opening degree is higher during
the entire delay period.
The function will not come into ef-
fect if Sgc detects a temperature that
is lower than the set value.
The reference for the receiver pres-
sure is set in relative bar.
(The "IT comp. state" read-out is the
signal received from the IT control-
ler.)
Capacity controller RS8HE202 © Danfoss 2017-07
Settings in IT controller
Select suction group
Select IT
Select IT compressor
From where the coordination with
the MT controller is initiated.
- DI input, which receives signals
when the IT compressor is to begin.
- Relay output, which emits signals
when the compressor is running.
The reference in the IT controller is
set in °C.
(The receiver pressure is set in rela-
tive bar.)
Receiver pres- Po Ref
sure [°C]
[bar relativ]
34 0
35 1
36 2
37 3
38 4
39 5
40 6
41 7
42 8
The receiver pressure, Prec, must be
connected to the Po input on the IT
controller.
Signal from MT
Signal to MT
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