Technical data

Table Of Contents
REPLACE COMPONENTS
6 720 803 687 (2012/11) 79
11.4 REPLACING THE PCB HOUSING
Remove service cover ( Fig. 73, page 77).
Remove top casing panel.
Remove front casing panel.
Pull BUS cable plug to the hybrid manager at the terminal strip (TB1).
Pull the following plugs at the PCB ( Fig. 74, page 78 and Fig. 81,
page 87).
Fan motor (CNF1)
Linear expansion valves (LEV-A and LEV-B)
Temperature sensors TH3, TH33 on the pipe work for liquid
refrigerant
Temperature sensor TH32 on compressor casing
Temperature sensor TH4 for hot gas
Temperature sensor TH6 for evaporator (2-phase cable) and
outside temperature sensor TH7
High pressure switch (63H)
–4-way valve
Remove disconnected cables from electronics casing.
Pull compressor plug.
Remove 3 fixing screws from electronics casing.
Remove electronics casing by lifting it clear.
11.5 REPLACING PCBS
11.5.1 NOISE CIRCUIT BOARD
Undo all connectors.
Undo suppression filter ( Fig. 74, page 78) from the plastic
retainers and remove.
11.5.2 POWER CIRCUIT BOARD
REMOVAL
Undo all connectors.
Undo 3 screws from the passive cooler.
Undo inverter PCB ( Fig. 74, page 78) from the plastic retainers
and remove.
INSTALLATION
Apply conducting paste thinly and evenly.
Insert inverter PCB and tighten the 3 screws of the passive cooler.
11.5.3 CONTROLLER CIRCUIT BOARD
Undo all connectors.
Undo PCB ( Fig. 74, page 78) from the plastic retainers and
remove.
11.6 REPLACING FAULTY TEMPERATURE SENSORS TH3,
TH6 OR TH33
Remove service cover ( Fig. 73, page 77).
Remove top casing panel.
Remove front casing panel.
Remove back casing panel.
Pull plug of temperature sensor TH3 (white), TH6 (red) or TH33
(yellow) off the PCB inside the electronics casing ( Fig. 81,
page 87).
Undo fixing of connecting cables on back of electronics casing.
Take temperature sensor TH3, TH33 or TH6 out of its holder.
11.7 REPLACING OUTSIDE TEMPERATURE SENSOR TH7
Remove service cover ( Fig. 73, page 77).
Remove top casing panel.
Pull plug of temperature sensor TH7 (red) off the PCB inside the
electronics casing ( Fig. 81, page 87).
Undo fixing of connecting cable on back of electronics casing.
Take temperature sensor TH7 out of its holder.
11.8 REPLACING TEMPERATURE SENSORS TH4 AND TH32
Remove service cover ( Fig. 73, page 77).
Remove top casing panel.
Remove front casing panel.
Remove back casing panel.
Removing electronics casing
Remove temperature sensor TH4 from the retainer ( Fig. 81,
page 87).
Take temperature sensor TH32 on compressor casing out of its
holder.
CAUTION: Damage through electrostatic discharge!
Never touch a PCB if you are not wearing an earthed
wristband.
CAUTION: Equipment damage due to electrostatic
discharge!
Never touch a PCB if you are not wearing an earthed
wristband.
CAUTION: Damage through electrostatic discharge!
Never touch a PCB without an earthed wristband.
Temperature sensors TH6 and TH7 form a single unit and
must, therefore, be replaced together ( “Replacing
outside temperature sensor TH7”).
CAUTION: Equipment damage due to electrostatic
discharge!
Never touch a PCB if you are not wearing an earthed
wristband.
Temperature sensors TH6 and TH7 are a single unit and
must be replaced at the same time ( “Removing
outside temperature sensor TH6”).
CAUTION: Equipment damage due to electrostatic
discharge!
Never touch a PCB if you are not wearing an earthed
wristband.