Danfoss AK-CC 750 series User Manual

78 RS8GM222 © Danfoss 10-2014 AK-CC 750 - 080Z0130 & 080Z0139
Principle
Up to four valves can be connected. One for each solid state
output.
Control can be carried out with electrically operated expansion
valves type AKV.
Or injection can take place with thermostatic expansion valves
(TEV) where the temperature will then be regulated with solenoid
valves type EVR or similar.
Adaptive superheat with AKV valve
The evaporating temperature is measured with pressure transmit-
ter P and the superheat with the pressure transmitter and the S2
sensor.
The function contains an adaptive algorithm that independ-
ently adjusts the valve’s opening degree, so that the evaporator
constantly delivers optimum refrigeration at lowest possible
superheat.
The superheat reference will be limited by the settings for min.
and max. superheat.
If the superheat is very low, the valve may be closed very quickly
using the "SH closed" setting.
When the superheat has dropped to 2°F over the "SH closed" limit,
this function will reduce the degree of opening of the valve so
that the valve will with certainty remain closed if the superheat
fall to the "SH closed" value. To ensure that the close function does
not generate the general superheat regulation, the "SH closed"
setting must be at least 2°F lower than "SH min".
One pressure transmitter can supply signals to several controllers
if they regulate refrigeration points on the same suction line. But if
a valve is mounted in an evaporator’s suction line, say, a KVP / KVQ
or PM, the pressure transmitter must be placed before the valve.
The signal can now only be used by the relevant controller.
Refrigerant
Before regulation can be commenced, the refrigerant must be
dened.
You can directly select one of the current refrigerants:
1 R12 11 R114 21 R407A 31 R422A
2 R22 12 R142b 22 R407B 32 R413A
3 R134a 13 Brugerdeneret 23 R410A 33 R422D
4 R502 14 R32 24 R170 34 R427A
5 R717 15 R227 25 R290 35 R438A
6 R13 16 R401A 26 R600 36 XP10
7 R13b1 17 R507 27 R600a 37 R407F
8 R23 18 R402A 28 R744 38 R1234ze*
9 R500 19 R404A 29 R1270 39 R1234yf*
10 R503 20 R407C 30 R417A
*) Only 080Z0139
If a new refrigerant is demanded which is not as yet contained
on the list you may select ”User-dened” which is subsequently
set with data for the refrigerant in question. The values can be
ordered from Danfoss.
Warning: Incorrect selection of refrigerant can cause damage to
the compressor.
MOP control
(MOP = Max. Operating Pressure)
The MOP function limits the valve’s degree of opening as long as
the evaporating temperature measured by S1 is higher than the
set MOP temperature. The function can only be active when the
AKV injection valve function is ON.
Start/stop of injection
The injection can be stopped separately for each evaporator sec-
tion.
Liquid injection

Danfoss AK-CC 750 series Specifications

General

Brand	Danfoss
Model	AK-CC 750 series
Category	Controller
Language	English