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Overview of control options
Control option
HR offset
No
Thermostat
Yes
No
Digital input
Yes
Increasing pressure reference with heat recovery
Heat recovery is initiated with an On signal when the thermostat
calls for heat or a DI signal is received.
Without HR offset
The pressure reference is increased to the "Pgc HR min" setting
The gas cooler reference is increased to the "Fan HR min" setting.
With HR offset
1. The pressure reference is increased to the "Pgc HR min" setting
The gas cooler reference is increased to the "Fan HR min" setting.
2. Afterwards it is adjusted with either a signal for the PI regulation
or with a voltage signal from an external source.
This signal will be between 0 and 100%.
a. At between 0 and 50%, the pressure reference will be a vari-
able between "Pgc HR Min" and "Pgc HR offset".
b. At over 50%, the pressure reference will be "Pgc HR offset".
c. At between 50 and 100%, the fans will be controlled so that
the temperature in the gas cooler is increased.
Overview
AK-PC 772A
Regulation using
-
Temperature control
Consumer signal
-
Temperature control
Consumer signal
Consumer
reference
Consumer
reference
Capacity controller RS8HF102 © Danfoss 2017-07
Input signals
Settings
Temperature cut in / cut out
Temperature sensor
Pgc HR min, fan HR min
Temperature cut in / cut out
Pgc HR min, fan HR min
2 temperature sensors
HR reference temperature
Pgc HR offset, fan HR offset
Temperature cut in / cut out
Temperature sensor
Pgc HR min, fan HR min
0 - 10 V
Pgc HR offset, fan HR offset
On / Off
Pgc HR min, fan HR min
Pgc HR min, fan HR min
On / Off
HR reference temperature
Temperature sensor
Pgc HR offset, fan HR offset
On / Off
Pgc HR min, fan HR min
0 - 10 V
Pgc HR offset, fan HR offset
Info
Remember the isolation amplifier
If signals are received from other controls, e.g. heat recovery for
one of the inputs, a galvanically insulated module should be
inserted.
The relay can engage both the gas valve and the circulation pump.
When the relay pulls in and releases, the three-way valve will be
switched around.
It can take up to 2 minutes for the valve to change position.
Installing a time delay to cut out the circulation pump is recom-
mended.
Output
A relay can be
selected
103
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