Operating status
Table 49: Operating status
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:
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 compressor is restricted from starting until the minimum ON timer expires
The compressor is restricted from stopping until the minimum OFF timer expires
The defrost has terminated and the controller is waiting for drip delay to expire, while the water is dripping o 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 air o temperature is below the minimum S4 frost limit (r98, S4 frost protection)
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
ow 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, S3 or S4)
Adaptive superheat control
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 CO2 systems with
ejectors. Signal is provided via digital input or from the system manager
(1)
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
night operation.
• If S3 or S4 sensor fails, the thermostat will operate with a registered ON/OFF duty cycle during day and night operation.
(1)
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
night operation.
• If S3 or S4 sensor fails, the thermostat will operate with a registered ON/OFF duty cycle during day and night operation.
AK-CC55 Single Coil and Single Coil UI
© Danfoss | Climate Solutions | 2021.02 BC364229688105en-000101 | 64
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