Will Not Deep Recover - Bosch ACS 753 Repair Instructions

ACS 753, ACS 763, ACS 863 Service Manual

Will Not Deep Recover

Vacuum Pump Running
1. Verify no issue on ISV recovery way (one
way valve in tank vapor side).
2. Verify the ISV contains a minimum of 454 g
(1 lb) of chargeable refrigerant.
3. Verify the vacuum (S9), deep recover (S12),
and oil return (S13) solenoids are receiving
power and opening properly.
• If not receiving power, check the
continuity of the wiring between solenoid
and power board. Repair as needed.
• If the wiring is correct and no power is
being applied to the solenoid, replace
the power board.
• Verify the accumulator transducer
is functioning properly and reading
accurately.
• Verify the solenoid coil is opening the
solenoid properly.
NOTE: The oil return (S13) solenoid is controlled
to maintain 0 to 0.2 bar (3 psi) in the accumulator.
Only this solenoid will be activated at a time and
it will be pulsed intermittently.
4. Test the pump per the test procedure in the
Vacuum Pump section. If it fails, replace
the pump.
Robert Bosch GmbH
Diagnostics and Testing
Vacuum Pump Not Running
1. Check for proper power source, circuit
breaker, and electrical connectors for
damage or corrosion. Replace or repair as
required.
2. Connect the unit power cable directly to
the power source. Do not use an extension
cord.
3. Check for 230 V at the vacuum pump
connector, pins 2 and 3.
• If voltage is present, replace vacuum
pump assembly.
• If voltage is not present, continue to next
step.
NOTE: When checking voltage to the vacuum
pump, it is normal to read low voltage at the
connector when it's disconnected and the power
to the vacuum pump is off.
4. Check for 230 V from the power board on
connector P6.
NOTE: If the fan is operating, power is present
at the power board. The fan, vacuum pump, and
compressor use the same power source. The
fan shall operate whenever the power switch
is turned on.
5. Perform functional check.
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SP00D00609 2018-03-26