AK-PC 781A Capacity controller RS8HE202 © Danfoss 2017-07 37
Determine the connection points
All connections must be programmed with module and point, so
in principle it does not matter where the connections are made, as
long as it takes place on a correct type of input or output.
• The controller is the first module, the next one is 2, etc.
• A point is the two or three terminals belonging to an input or
output (e.g. two terminals for a sensor and three terminals for a
relay).
The preparation of the connection diagram and the subsequent
programming (configuration) should take place at the present
time. It is most easily accomplished by filling in the connection
survey for the relevant modules.
Principle:
Name On module On Point Function
fx Compressor 1 x x Close
fx Compressor 2 x x Close
fx Alarm relay x x NC
fx Main switch x x Close
fx P0 x x AKS 32R 1-6 bar
The connection survey from the controller and any extension
modules are uploaded from the paragraph "Module survey. E.g.
controller module:
Module Point
10
Mind the numbering.
The right-hand part of the
controller module may look like
a separate module. But it isn’t.
- Columns 1, 2, 3 and 5 are used for the programming.
- Columns 2 and 4 are used for the connection diagram.
Signal Module Point
Terminal
Signal type /
Active at
Discharge temperature - Sd
1
1 (AI 1) 1 - 2 Pt 1000
Suction gas temperature- Ss 2 (AI 2) 3 - 4 Pt 1000
Outdoor temperature - Sc3 3 (AI 3) 5 - 6 Pt 1000
External compressor stop 4 (AI 4) 7 - 8 Closed
Thermostat sensor in plant room
- Saux1
5 (AI 5) 9 - 10 Pt 1000
Suction pressure - Po 6 (AI 6) 11 - 12 AKS 2050-59
Condensing pressure - Pc 7 (AI 7) 13 - 14 AKS 2050-159
Level switch, oil, comp.1 8 (AI 8) 19 - 20 Closed
Level switch, oil, comp.2 9 (AI 9) 21 - 22 Closed
Level switch, oil, comp.3 10 (AI 10) 23 - 24 Closed
Level switch, oil, comp.4 11 (AI 11) 25 - 26 Closed
Solenoid valve, oil , comp. 1 12 (DO 1) 31 - 32 ON
Solenoid valve, oil , comp. 2 13 (DO 2) 33 - 34 ON
Solenoid valve, oil , comp. 3 14 (DO 3) 35 - 36 ON
Solenoid valve, oil , comp. 4 15 (DO 4) 37 - 38 ON
Solenoid valve, oil, Separator 16 (DO 5) 39 - 40 - 41 ON
Circulation pump tw 17 (DO6) 42 - 43 - 44 ON
Circulation pump hr 18 (DO7) 45 - 46 - 47 ON
Room fan 19 (DO8) 48 - 49 - 50 ON
Voltage signal to high pressure
valve, ICMTS
24 - 0-10 V
25 -
Signal Module Point
Terminal
Signal type /
Active at
Level switch, oil, receiver High
2
1 (AI 1) 1 - 2 Closed
Level switch, oil, receiver Low 2 (AI 2) 3 - 4 Closed
Level switch, oil, Separator 3 (AI 3) 5 - 6 Closed
Level switch, CO2 receiver 4 (AI 4) 7 - 8 Open
Pulse reset of stopped compressor 5 (AI 5) 13 - 14 Pulse
6 (AI 6) 15 - 16
Refrigerant receiver, Prec CO2 7 (AI 7) 17 - 18 AKS 2050-159
Oil receiver, Prec Oil 8 (AI 8) 19 - 20 AKS 2050-159
Compressor 1 9 (DO 1) 25 - 26 - 27 ON
Compressor 2 10 (DO 2) 28 - 29 - 30 ON
Compressor 3 11 (DO 3) 31 - 32 - 33 ON
Compressor 4 12 (DO 4) 34 - 35 - 36 ON
Start /stop of VLT for fans 13 (DO 5) 37 - 38 - 39 ON
3-way valve, tap water, V3tw 14 (DO6) 40 - 41 - 42 ON
3-way valve, heat circuit, V3hr 15 (DO7) 43 - 44 - 45 ON
3-way valve, gas cooler, V3gc 16 (DO8) 46 - 47 - 48 ON
Example continued
Note
The safety relays should not be fitted onto a module
with override changeovers, as they can be put out of
operation by an incorrect setting.
Continued next page
Signal Module Point/Step Terminal Signal type
Tap water temperature - Stw2
3
1 (AI 1) 1 - 2 Pt 1000
Tap water temperature - Stw3 2 (AI 2) 3 - 4 Pt 1000
Tap water temperature - Stw4 3 (AI 3) 5 - 6 Pt 1000
Tap water temperature - Stw8 4 (AI 4) 7 - 8 Pt 1000
Heat reclaim temperature Shr2 5 (AI 5) 9 - 10 Pt 1000
Heat reclaim temperature Shr3 6 (AI 6) 11 - 12 Pt 1000
Heat reclaim temperature Shr4 7 (AI 7) 13 - 14 Pt 1000
Heat reclaim temperature Shr8 8 (AI 8) 15 - 16 Pt 1000
Stepper signal to by-pass valve,
CCMT
9 (step1)
25 - 26 - 27 - 28
CCM (ETS)
10 (step 2) 29 - 30 - 31 - 32
11 (step 3) 33 - 34 - 35 - 36
12 (step 4) 37 - 38 - 39 - 40
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