C6.2.38/0719/E
35
Condition
Cause
Corrective action
Low suction
pressure
System design
load too small
If the compressor is running in a tandem or in parallel,
modulate the running process.
Inadequate
refrigerant
going to the
evaporator
Lower normal discharge pressure values can lead to
insufficient refrigerant flow to the system.
This can also be verified by checking the evaporator
outlet superheat, if it is found unusually high. Check the
selection of the expansion valve (likely undersized).
Noise during shut-
off
Anti-reverse
device
This does not have any effect on the durability of the
compressor, no action is necessary.
When troubleshooting a compressor in combination with the drive please follow the
recommendations below:
▪
Before servicing shut off and secure the power supply. Wait for 2 minutes before performing any
servicing on the drive.
▪
Drive: Check all the external wiring for miswiring, broken leads or a cable short circuit. Check for
loose or burned contacts. Check for burned components on the board.
▪
Chokes/PFC: Check all the wiring and check for loose or burned contacts.
▪
External sensors: Make sure that the external sensors are properly connected and still working
(discharge temperature sensor and high-pressure switch).
▪
Drive cooling: For air-cooled drives, make sure that the airflow is not obstructed.
▪
EMI filter: Check all the wiring and check for loose or burned contacts on the board.
▪
Compressor: Make sure the compressor is running within the envelope. Check the winding
resistances from the compressor motor and the cables between compressor and drive. Check for
loose or burned contacts.
8
Dismantling & disposal
Removing oil and refrigerant:
▪
Do not disperse in the environment.
▪
Use the correct equipment and method of removal.
▪
Dispose of oil and refrigerant in accordance with national legislation and
regulations.
Dispose of compressor and drive in accordance with national legislation and
regulations.
DISCLAIMER
1. The contents of this publication are presented for informational purposes only and are not to be
construed as warranties or guarantees, express or implied, regarding the products or services
described herein or their use or applicability.
2. Emerson Climate Technologies GmbH and/or its affiliates (collectively "Emerson"), as
applicable, reserve the right to modify the design or specifications of such products at any time
without notice.
3. Emerson does not assume responsibility for the selection, use or maintenance of any product.
Responsibility for proper selection, use and maintenance of any Emerson product remains solely
with the purchaser or end user.
4. Emerson does not assume responsibility for possible typographic errors contained in this
publication.
