Thermostatic Expansion Valve Control - Danfoss AK-CC55 Compact User Manual

AK-CC55 Compact
This type of control requires that the controller receives an on/off signal from (for example) a suction accumulator in
the suction line.
Figure 9: Adaptive liquid control with AKV valve
A level switch in the tank will register when the liquid level exceeds the max. level. When this happens, the
controller will switch to dry expansion, and then back to liquid control when the liquid level has dropped. The
function is defined in setting o02, o37 or o84.
The function can also be activated via data communication from a system unit. If the adaptive liquid control signal is
lost, the controller will automatically switch back to dry expansion.
 WARNING:
Accidental actuation may allow liquid throughput to the compressor. It is the installer's responsibility to ensure that
signal loss to the controller will not result in liquid throughput to the compressor. Danfoss accepts no responsibility
for damage resulting from inadequate installation.

Thermostatic expansion valve control

In the compact version the refrigeration (injection) can be controlled either by starting/stopping a compressor or by
opening/closing a solenoid valve in the liquid line.
Figure 10: AK-CC55 Compact with evaporator, solenoid
valve, expansion valve and sensor positions
S4
S5
S3
Brine control
When changing from ON/OFF control to modulating control in TXV applications, a solenoid valve can be PWM
controlled with a set period time from 30 – 900 sec. A number of additional brine control parameters are available in
the injection control menu. When brine control is enabled, a dedicated brine defrost can also be set up in order to
force open the brine valve while defrosting.
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