8
Electronic Controller
Service Manual
SERENE SC112G
Running the Chiller
Operating
Modes
The electronic controller will automatically switch the chiller between
‘Normal’ and ‘Energy Saving’ modes depending on usage. If the front door
(electronic controller side) is not opened for four hours, the chiller will
automatically enter Energy Saving mode and the sign and interior lights will
switch off. To manually switch the chiller between Normal and Energy
Saving modes, press and hold the Energy Save (up) button on the electronic
controller faceplate. The chiller can also be bought into Normal mode by
holding the front door (electronic controller side) open for up to ten seconds.
Compressor
The compressor cycles on and off during Normal and Energy Saving modes.
It does not run when the chiller is in defrost mode. If the electronic controller
displays ‘Err’ there is a fault within the refrigeration system and the
compressor will not run.
Evaporator
Fan
The evaporator fan starts a few minutes after the chiller is turned on and
runs continuously while the compressor is running or during defrost, and
cycles on and off while the compressor is off. It stops when the front door is
open or if the electronic controller displays ‘Err’ indicating a fault within the
refrigeration system.
Condenser
Fan
The condenser fan runs continuously when the chiller is on except if the
electronic controller displays ‘Err’ indicating a fault within the refrigeration
system.
Temperature
Probes
Two temperature probes feed data to the electronic controller - the control
probe and the evaporator probe. The control probe controls the chiller
temperature, provides the chiller temperature for the electronic controller to
display, and notifies the electronic controller of any erratic or abnormal
temperatures that could identify an issue within the refrigeration system.
The evaporator probe controls the refrigeration system defrost initiation and
termination.
Door Switch
The chiller is fitted with a door switch below the front door (electronic
controller side). A small magnet in the door frame activates the switch. The
door switch tells the electronic controller to turn off the evaporator fan motor
(i.e. if door opened) during normal run operation, initiate Energy Saving
mode if the door is not opened for four hours and to reactivate Normal mode
if the door is opened for a period of time during night mode.
Defrost Cycle
The first automatic defrost occurs 3 hours after the chiller is switched on. During
the defrost cycle the compressor stops and the evaporator fan runs
continuously. The defrost cycle will terminate (stop) when the evaporator
probe reaches
≥
4°C or after the defrost cycle has been running for 20 minutes.
Lighting
The chiller is fitted with bottom sign lights and interior pillar lights. The lights
will come on when the chiller is initially plugged in. When in Normal mode
the sign and interior lights are on. When in Energy Saving mode the sign and
interior lights are off. Press the Light button on the electronic controller
faceplate to manually switch the sign and interior lights on and off (see
page 7).
