Operating Status - Danfoss AK-CC55 Water Loop User Manual

AK-CC55 Water Loop

Operating status

Table 38: 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
S2 Min ON timer
S3 Min OFF timer
S4 Drip off
S10 Main switch OFF
S11 Thermostat cut-out
S12 Frost protection S4
S14 Defrost
S15 Fan delay
S17 Door open
S18 Melt period
S19 Modulating temp. control
S20 Emergency control
S25 Manual control
S29 Case cleaning
S30 Forced cooling
S32 Power-up delay
S33 Air heating
S34 Compressor safety cut-out
S45 Shut down controller
S50 High S7 brine inlet temperature The S7 brine inlet temperature on the condenser has violated the max. alarm limit
(1) (1)
Emergency control: Emergency control:
• If the thermostat air sensor fails, the compressor will operate with the set emergency on/off duty times. For variable speed compressor/ • If the thermostat air sensor fails, the compressor will operate with the set emergency on/off duty times. For variable speed compressor/
pump it will operate with the set emergency speed level. pump it will operate with the set emergency speed level.
© Danfoss | Climate Solutions | 2022.04
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 compressor is restricted from stopping until the minimum ON timer expires
The compressor is restricted from starting 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 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 air off 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)
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, S3 or S4)
(1)
Main switch has been set in Service position for manual control of outputs
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 compressor has been cut-out via its safety chain
The control has been stopped due to a digital input signal or from the system manager
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