Operating Status - Danfoss AK-CC55 Multi Coil User Manual

AK-CC55 Multi Coil

Operating status

Table 46: Operating status
Ctrl. State/
Operating status
Code
Push the info button for 3 seconds to see status. If there is a status code, it will be shown on the display. The individual status codes have the
following meanings:
S0 Normal ctrl.
S1 Hold after defrost
S4 Drip off
S10 Main switch OFF
S11 Thermostat cut-out
S14 Defrost
S15 Fan delay
S16 Forced closing
S17 Door open
S18 Melt period
S19 Modulating temp. control
S20 Emergency control
S23 Adaptive superheat control
S24 Start injection
S25 Manual control
S26 No refrigerant selected
S29 Case cleaning
S30 Forced cooling
S32 Power-up delay
S33 Air heating
S45 Shut down controller
S48 Adaptive liquid control
(1) (1)
Emergency control: Emergency control:
• If Pe or S2 sensor fails, the controller will operate with a safe opening degree based on normally registered opening degree during day and • If Pe or S2 sensor fails, the controller will operate with a safe opening degree based on normally registered opening degree during day and
night operation. night operation.
• If S4 sensor fails, the thermostat will operate with a registered ON/OFF duty cycle during day and night operation. • If S4 sensor fails, the thermostat will operate with a registered ON/OFF duty cycle during day and night operation.
© Danfoss | Climate Solutions | 2022.08
Description
The controller is running normal control. There is no other control taking priority
The controller is waiting for other controllers to terminate coordinated defrost
The defrost has terminated and the controller is waiting for drip delay to expire, while the water is dripping off the
evaporator
The controller has been stopped because the parameter r12 Main switch has been set in OFF or Service position or
the controller has been stopped via Main switch function on DI input
The air temperature has reached the thermostat cut-out value
The controller is running a defrost cycle
The evaporator fans are waiting to start after a defrost cycle (d07, Fan start delay and d08, Fan start temperature)
The injection valve has been forced closed via a signal on a digital input or from the system manager (compressor
pack is restricted from starting)
DI signal indicates that the cold room door is open
The controller has stopped refrigeration for a short while to turn ice crystals into water and thereby improve air
flow through the evaporator
The air temperature is controlled close to the set point via a modulating temperature control
The air temperature is controlled according to an emergency procedure due to sensor error (Pe, S2 or S4)
(1)
The superheat of the evaporator is optimized
The liquid injection into the evaporator has started
Main switch has been set in Service position for manual control of outputs
The refrigerant type has not been selected (parameter o30 Refrigerant)
A case cleaning operation has been initiated via parameter o46 Case cleaning mode or via a signal on a digital
input or via the AK-CC55 Connect app
The thermostat has been overruled to run forced cooling via a signal on a digital input
The controller has just been powered up and the output control is waiting for the power-up delay to expire (pa-
rameter o01, Delay of outputs at power-up)
The air heater is energized in order to raise the air temperature (parameters r62, Air heater neutral zone and r63, Air
heater start delay)
The control has been stopped due to a digital input signal or from the system manager
The superheat control is running adaptive liquid control with reduced superheat for transcritical CO
ejectors. Signal is provided via digital input or from the system manager
systems with
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